CBSE Class 6

In this page, we are providing Electricity and Circuits Class 6 Extra Questions and Answers Science Chapter 12 pdf download. NCERT Extra Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 12 Extra Questions and Answers Electricity and Circuits

Extra Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers Solutions

Electricity and Circuits Class 6 Extra Questions Very Short Answer Type

Question 1.
Name a good conductor of electricity which is not a metal.
Answer:
Air

Question 2.
Name the material that glows inside the bulb.
Answer:
Filament

Question 3.
What kind of cells are used in TV remotes?
Answer:
Pencil cells

Question 5.
What is a cell?
Answer:
It is a device that produces electricity.

Question 6.
What is electricity?
Answer:
The flow of an electric current constitutes electricity.

Question 7.
How many terminals are there in a cell?
Answer:
There are two terminals in a cell.

Question 8.
What is the main function of a switch?
Answer:
It is used to regulate the flow of current in a circuit.

Question 9.
Name some metals which are conductors.
Answer:
Silver, copper, aluminium, etc.

Question 10.
Name some conductors which are not metals.
Answer:
Moist air, salt solution, impure water, graphite, etc.

Question 11.
Name some insulators of electricity.
Answer:
Mica, ebonite, glass, wood, dry air, etc.

Question 12.
Which type of material is used in electric appliance as protective measures?
Answer:
Insulator

Question 13.
What is an open circuit?
Answer:
When there is a gap between two terminal, the circuit is called an open circuit.

Question 14.
Can rubber or jute be used instead of metal wire to connect circuit?
Answer:
No, we cannot use rubber or jute to connect circuit wires.

Question 15.
How is electricity produced by an electric cell?
Answer:
An electric cell produces electricity from chemicals stored in it.

Question 16.
Name two metal used to connect wires.
Answer:
Copper and aluminium.

Question 17.
When does a bulb glow?
Answer:
A bulb glows only when the circuit is complete.

Question 18.
Why is tungsten used as a filament?
Answer:
Tungsten has high melting point and high resistance, hence it is used as filament.

Question 19.
Why are electric wire, covered with rubber and plastic?
Answer:
To prevent electric shocks as they are insulators.

Question 20.
In which of the following circuits A, B and C given below, the cell will be used up very rapidly?

Answer:
In circuit C the cell will be used up very rapidly because two bulbs are connected to a single cell.

Electricity and Circuits Class 6 Extra Questions Short Answer Type

Question 1.
Why we are advised not to touch electric appliances and switches with wet hands?
Answer:
Water is a good conductor of electricity and if our hands are wet it can pass to us quickly giving us an electric shock.

Question 2.
Define an electric cell and a battery.
Answer:
A cell is an electric device that produces electricity. When two or more cells are joined together, it is called a battery.

Question 3.
Define a conductor.
Answer:
The substance which allows an electric current to pass through it, is called a conductor, e.g., metals like gold, silver, etc.

Question 4.
What is an insulator?
Answer:
The substance which does not allow current to pass through it, is called an insulator, e.g., eraser, paper, polythene, etc.

Question 5.
What do you mean by an electric circuit?
Answer:
The closed path along which the electric current flows from one terminal to another is called as an electric circuit.

Question 6.
What is an open circuit? Does current flow in it?
Answer:
The circuit in which arrangements of components is disturbed any way or electric contact of any point is broken is called an open circuit. An electric current does not flow in an open circuit as the electrical path required for flow of current is not completed.

Question 7.
Why is a copper wire usually covered with rubber or plastic?
Answer:
Rubber or plastics are insulators. They prevent short circuiting and electric shocks if by mistake any living things come in contact with the wires.

Question 8.
Is air a conductor or an insulator? Explain.
Answer:
If air is dry then it is an insulator or bad conductor of electricity as it doesn’t conduct electricity when the circuit is open. If air is moist then it acts as conductor.

Question 9.
Why does a cell stop producing electricity after sometime?
Answer:
After sometime, all the chemicals in an electric cell is used up. Thus, no chemical reaction takes place to produce electrical energy.

Electricity and Circuits Class 6 Extra Questions Long Answer Type

Question 1.
What is bulb? Mention two main conditions necessary to make the bulb glow.
Answer:

A bulb is an electric device which gives us light when a suitable material inside it called filament gets heated up to a high temperature. It runs on electricity viz., when an electric current passes through it, it glows.

Two main conditions necessary to make the bulb light up are:
(i) Connect the positive (+ve) terminal of the left cell with the negative (-ve) one of the right side cell using a wire.
(ii) Close the switch to complete the circuit.

Question 2.
Explain how does an electric current flow in an electric circuit.
Answer:
An electric current flows from the positive (+ve) terminal to the negative (-ve) terminal of the cell in the circuit through the connecting wires as shown in the given figure.

The current flows only when the circuit is complete, i.e., all the connections are intact and the key is switched ‘on’. We see that the bulb glows. But when the wires are broken or not properly connected to the terminals of the cell, the circuit is incomplete and the current does not flow in the circuit. The bulb does not light up.

Question 3.
What is torch? Give its various parts and explain its working. Also give its labelled diagram.
Answer:
A torch is an electric device that runs on electricity. It is actually a compact electric circuit. Its various parts are-a metallic or plastic casing, bulb, reflector, slide, switch, metal switch contact.

An electric current flows in a closed circuit only. In a torch, the cells are connected to a small bulb through a slide switch. When this slide switch is slided forward cell contact is complete with the bulb. The electric circuit is closed or complete.

The electric current starts flowing from the terminal of the cell and returns to the other terminal. Thus, the bulb starts glowing and gives light. On the other hand, on switching off, the contact between the metal strips is broken and the current stops flowing. Thus, the bulb stops glowing.

Question 4.
What is a circuit? Name its different components and draw a labelled diagram of a circuit.
Answer:

A circuit is a path along which an electric current flows. It is made up of various electrical components which are discussed below:

1. There is a cell or a battery in the circuit that is used as a source of electric current.
2. There is an electric switch that is used to regulate the flow of current. It is also called ‘key’. When the switch is ‘on’, the current flows in the circuit and when it is ‘off, the current does not flow.
3. A bulb is connected to the circuit to confirm the flow of current. When it lights up, the circuit is said to be complete, i.e., current is flowing.
4. On the other hand, when the bulb does not glow, the circuit is said to be incomplete, i.e., current is not flowing.
5. The most important component of the circuit is the connecting wire which connect all the components of the circuit to make the current flow.

Question 5.
Describe a closed and open circuit with the help of diagrams.
Answer:

A circuit which is complete in all respect, i.e., its all connections are intact is called a closed circuit. When the switch is on, the current flows in it and the bulb glows (Fig. 12.22a). On the other hand, a circuit is called open or not complete (Fig. 12.22b), when connections are not intact, i.e., broken. In an open circuit, when the switch is on, the bulb does not glow. It means that current is not flowing in the circuit. This is due to broken wires or all components in the circuit are not connected properly.

Question 6.
Mention different safety measures and precautions while using electricity and electrical appliances.
Answer:
Electricity is very useful to us. It has made our life comfortable, easy and luxurious. On the other hand, it is dangerous also. It may cause great mishappenings, injuries and sometimes even death. So we must adopt some safety measures and take precautions discussed below:

1. Never touch electrical switches or gadgets when your body is wet.
2. If you need to operate or repair any electrical appliances, wear rubber hand gloves and stand on a dry wooden or plastic base.
3. Never play with electric sockets or wires.
4. In case of short circuit or a spark in a switch, put the main switch off immediately with the help of a plastic or wooden stick.
5. In case of fire in electric wires, never use water to extinguish it. First switch off the mains, then use dry sand to extinguish the fire.

Electricity and Circuits Class 6 Extra Questions HOTS

Question 1.
Two bulbs are connected to a cell as shown in Fig. 12.23. Bulb A got fused. Will the bulb B glow in this circuit? Why?
Answer:

No, the bulb B will not glow because there is only one path from the source of current. If any one of the light bulbs get fused, the entire circuit will stop operating.

Question 2.
You have a single piece of connecting wire. Can you make a bulb glow without cutting the wire into two? Explain with the help of a circuit diagram.
Answer:
Yes, we can glow the bulb by joining one end of the wire to the negative terminal of battery and other to the metal cap of the bulb. Then by placing the bulb on the positive terminal of the cell will make the bulb glow.

Question 3.
which of the labels 1, 2, 3, 4 or 5, shows the terminals of the bulb?

Answer:
Label 3 and 4 shows the terminals of the bulb.

Question 4.
Two different ways are shown below to connect a bulb with a cell.

(i) What will be the direction of the current through the bulb in both the cases. (Q to P or P to Q)
(ii) In which case the bulb will glow?
(iii) Does the brightness of the glowing bulb depend on the direction of current through it?
Answer:
(i) In Fig. A, current will flow from Q to P and in Fig. B current will flow from P to Q.
(ii) In both of the cases bulb will glow as the circuit is complete.
(iii) No.

Electricity and Circuits Class 6 Extra Questions Value-Based (VBQs)

Question 1.
When Sheena’s classmates leave for games, library, yoga, etc., classes, Sheena always remembers to switch off the lights and fans of her class. For this practice she was honoured by the president of eco-club.
(a) What is electricity?
(b) What are the sources of electricity in your home?
(c) What values of Sheena is shown here?
Answer:
(a) Electricity is a form of energy used to power machines and electrical appliances.
(b) We get electricity in our home through cell, power house and solar cells.
(c) Sheena is an eco-friendly, responsible and intelligent girl.

Question 2.
After taking a bath Rahman went to his room. As soon as he raised his hand to switch on the light, his mother shouted out loudly. He was very astonished, with the strange behaviour of his mother. His mother came to him and explained him the reason “why he shouldn’t be touching the electrical items with wet hands”. Rahman made up his mind to spread this awareness in the school. So he decided to give a small speech on this topic during the school assembly.
(a) What are electrical appliances?
(b) What would have happened if Rahman touched the switch with his wet hand?
(c) What value of Rahman is shown here?
Answer:
(a) Devices that run on electricity are called electrical appliances.
(b) He might have got shock.
(c) Rahman is a responsible, sensible, caring and confident boy.

In this page, we are providing Light Shadows and Reflection Class 6 Extra Questions and Answers Science Chapter 11 pdf download. NCERT Extra Questions for Class 6 Science Chapter 11 Light Shadows and Reflection with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 11 Extra Questions and Answers Light Shadows and Reflection

Extra Questions for Class 6 Science Chapter 11 Light Shadows and Reflection with Answers Solutions

Light Shadows and Reflection of Distances Class 6 Extra Questions Very Short Answer Type

Question 1.
What is light?
Answer:
Light is a form of energy which enables us to see.

Question 2.
What is a luminous object?
Answer:
An object having its own light is called a luminous object, e.g., torch, sun, etc.

Question 3.
What is a non-luminous body?
Answer:
An object which does not have its own light is called a non-luminous object, e.g., chair, moon, etc.

Question 4.
Name some luminous objects.
Answer:
Torch, bulb, sun, firefly and a burning candle.

Question 5.
Give four examples of non-luminous objects.
Answer:
Table, chair, blackboard and notebook.

Question 6.
Name four natural luminous bodies.
Answer:
The sun, firefly, stars and fire.

Question 7.
Name some artificial source of light.
Answer:
Candle, bulb, kerosene oil, lamp and torch.

Question 8.
What is a transparent object?
Answer:
An object which allow light to pass through it, is called transparent object, e.g., clear glass, water, etc.

Question 9.
What is a translucent object?
Answer:
An object which allows only a small part of light through it, is called translucent object, e.g., wax paper, fog, etc.

Question 10.
What is an opaque object?
Answer:
An object which does not allow light at all to pass through it, is called opaque object, e.g., wooden sheet, wall, etc.

Question 11.
Give four examples of transparent objects.
Answer:
Clear glass, clean water, cellophane paper and air.

Question 12.
Give four examples of translucent object.
Answer:
Frosted glass, wax paper, greased paper and butter paper.

Question 13.
Give four examples of opaque objects.
Answer:
Wood, metals, clay and black paper.

Question 14.
What is a shadow?
Answer:
The dark patch formed due to obstruction of light rays by an opaque object is called a shadow.

Question 15.
What information does a shadow give about an object?
Answer:
A shadow gives information about the shape of the object.

Question 16.
Does the colour of the object affect the colour of the shadow?
Answer:
No, the colour of the object does not affect the colour of the shadow.

Question 17.
When is a shadow formed?
Answer:
A shadow is formed when an opaque object is placed in the path of light.

Question 18.
Define a pinhole camera.
Answer:
A pinhole camera is a device which forms a photograph like image of a bright object on a screen.

Question 19.
On which property of light a pinhole camera does work?
Answer:
Rectilinear propagation of light.

Question 20.
How does light travel?
Answer:
Light travels in a straight line.

Question 21.
What type of images are formed by a pinhole camera?
Answer:
The images formed by a pinhole camera are upside down, i.e., inverted image.

Question 22.
What is mirror?
Answer:
A smooth, polished reflecting surface is called a mirror.

Question 23.
What type of image is formed by a plane mirror?
Answer:
Erect and laterally inverted image is formed by a plane mirror.

Question 24.
What is the size of the image formed by a plane mirror?
Answer:
The size of the image formed by a plane mirror is same as that of the object.

Question 25.
What is the colour of the image formed by a plane mirror?
Answer:
The colour of the image formed by a plane mirror is same as that of the object.

Question 26.
What is an eclipse?
Answer:
The phenomenon of formation of shadows of celestial bodies on one another is called an eclipse.

Question 27.
What is rectilinear propagation of light?
Answer:
The property due to which light travels in a straight line is called rectilinear propagation of light.

Question 28.
What is reflection?
Answer:
the phenomenon of bouncing back of light by a highly polished surface is called reflection.

Question 29.
What is an incident ray?
Answer:
The ray of light falling on the surface of the mirror is called an incident ray.

Question 30.
What is reflected ray?
Answer:
The ray of light returning back from the mirror is called a reflected ray.

Light Shadows and Reflection of Distances Class 6 Extra Questions Short Answer Type

Question 1.
What is light?
Answer:
Light is a form of energy which when falls on the object enables us to see them. It helps us to see the objects from which it comes or from which it is reflected.

Question 2.
Distinguish between luminous and non-luminous objects?
Answer:
The objects which have light of their own are called luminous objects such as torch, bulb, burning candle, etc., whereas non-luminous objects does not have light of their own and can be seen only when light falls on them such as table, wall, book, etc.

Question 3.
What is a shadow? How is it formed?
Answer:
The dark patch formed behind an opaque object is called a shadow. It is formed when light ray falling on the surface of the mirror (say an opaque object) is blocked by it.

Question 4.
What are the essential conditions for formation of shadows?
Answer:
A shadow is formed when

1. there is a source of light.
2. there is an opaque object in the way of light.
3. the light ray falling on the opaque object is blocked by it.

Question 5.
Moon is a non-luminous body though it glows. Justify.
Answer:
Moon does not emit light of its own. So it is a non-luminous body. It glows due to reflection of sunlight by it.

Question 6.
What is a pinhole camera? What type of images is formed by it?
Answer:
A pinhole camera is a device which forms a photographic image of a bright object on a screen. The images formed by a pinhole camera are upside down (inverted images).

Question 7.
What is mirror? What type of images is formed by it?
Answer:
The glass sheet having a polished, shiny, smooth and reflective surface on the other side is called a mirror. The images formed by a mirror are erect and laterally inverted.

Question 8.
Why should we not look at the sun directly?
Answer:
The sun radiates ultraviolet radiations that could be extremely harmful for our eyes. This is why we should never see the sun with naked eyes.

Question 9.
What is natural pinhole camera? What type of images is formed by it?
Answer:
When sunlight falls in the leaves of a tree, the gaps between the leaves act as a natural pinhole camera. Afterwards rounded shaped images are formed on the earth. These are pinhole images of the sun.

Question 10.
What is lateral inversion?
Answer:
Lateral inversion means the apparent reversal of the mirror images when compared with the object. For example, right side of the object appear as left side in the image.

Question 11.
Write two differences between a shadow and an image.
Answer:
Images are formed by intersection of reflected rays whereas a shadows are formed when light does not reach behind the object. Images gives more information about the objects such as colour, structure, etc., whereas shadows do not provide such information.

Question 12.
Why is a silvered glass used as a mirror?
Answer:
A silvered glass has a smooth surface which helps in forming clear image. Silverness makes the surface shiny which helps in reducing the absorption of light falling on the mirror surface.

Question 13.
What is an eclipse? What are the two types of eclipse?
Answer:
The formation of shadows by celestial bodies on one another is called an eclipse. There are two types of eclipse.

1. When the moon comes in between the sun and the earth, the shadow of the moon falls on the earth. This is called solar eclipse.
2. When the earth comes in between the sun and the moon, the shadow of the earth falls on the moon. This is called lunar eclipse.

Question 14.
What are incident ray and reflected ray?
Answer:
(a) A light ray falling on a smooth, shiny and polished surface (say a plane mirror) is called the incident ray.
(b) The light ray returning back in the same medium after striking a smooth, shiny and highly polished surface (say a plane mirror) is called reflected ray.

Light Shadows and Reflection of Distances Class 6 Extra Questions Long Answer Type

Question 1.
What are the different types of object based on their ability to pass the light? Give suitable examples of each objects.
Answer:
On the basis of ability to pass light through an object, objects are classified into three main groups, i.e.,
(a) transparent
(b) translucent and
(c) opaque.

(a) Transparent objects: Objects through which light can pass easily are called transparent objects, e.g., clean glass, clean water, clean air, etc.
(b) Translucent objects: Objects through which light can pass partially and through which we cannot see clearly are called translucent objects, e.g., greased paper, wax paper, butter paper, etc.
(c) Opaque objects: Objects through which light cannot pass at all and through which we cannot see are called opaque objects. Only opaque objects can make shadows, e.g., wall, blackboard, stone, etc.

Question 2.
What is a pinhole camera? How does it works? Explain its construction and image formation.
Answer:
A pinhole camera is a device which casts a photographic image of a bright object on a screen. It works on the principle that light travels in a straight line.

A pinhole camera can be made with simple materials and can be used to obtain the image of sun and brightly lit objects. It consists of a box made of metal or a cardboard that has a fine hole in one face. A plate or any translucent sheet on the side opposite to the face containing the pinhole serves as a screen.

Images formed by a pinhole camera are upside down, i.e., inverted images.

Question 3.
With the help of diagrams show solar and lunar eclipses.
Answer:

Question 4.
What is umbra and penumbra? With the help of a suitable diagram, show their formation.
Answer:
The inner region of a shadow which is completely dark is called umbra and the outer region surrounding the umbra which is a partially dark region is called penumbra. These two regions in shadows are formed when an opaque body is placed in front of an extended or slit source.

Light Shadows and Reflection of Distances Class 6 Extra Questions HOTS

Question 1.
Why shadows are black in colour?
Answer:
Shadow is formed by an object by obstructing light so that it doesn’t reach a surface. The area in shadow appears black because there is no light falling on it.

Question 2.
Why we do not obtain upside-down image of the Sun through a pinhole camera?
Answer:
Shape of the Sun is round, so when we see the sun from any angle we get a circle only.

Question 3.
We consider moon as non-luminous body but still we can see things on a full moon night. Why?
Answer:
Moon does not have light of its own. Moon reflects the light of sun in the night. On dark nights a little illumination by moon enables us to see things around us.

Question 4.
Why lunar eclipse not occur every month?
Answer:
It do not occur every month because the Earth’s orbit around the sun is not in the same plane as the moon’s orbit around the earth.

Light Shadows and Reflection of Distances Class 6 Extra Questions Value Based (VBQs)

Question 1.
Parthiv’s grandmother looked a little worried today. She asked everybody to have their lunch after 3 p.m. When Parthiv asked the reason she said, “today is solar eclipse at 2:15 p.m.” Parthiv made her relaxed and said this is a natural phenomenon and nothing bad or unpleasant things are related to this. His grandmother listen him carefully.
(a) What is solar eclipse?
(b) Why do you think that some people believe that these eclipses will have some bad effect on them?
(c) Do you experienced such superstition in your life?
(d) What value of Parthiv is shown here?

Answer:
(a) When the earth, moon and sun are in a straight line, with moon in between, the shadow of moon falls on the earth and this is known as solar eclipse.
(b) Because these type of people are superstitious and doesn’t know the scientific reason behind this.
(c) Yes, many a times by my grandmother.
(d) Parthiv is an intelligent and mature boy with scientific aptitude.

Question 2.
Soumen’s teacher asked their class to make a pinhole camera by themselves. Soumen read the activity 5 given in his textbook on how to make a pinhole camera. But he was unable to get the image of a well lit object. He was very upset. His elder brother on observing his pinhole camera found that the hole made by him was quite large. He rectified Soumen’s mistake and helped him making another pinhole camera. Now, Soumen can see the image of the object.
(a) On which principle of light does a pinhole camera works?
(b) Why was Soumen unable to get the image of a well lit object?
(c) How does the formation of the image by a pinhole camera is affected by size of the hole?
(d) What values of Soumen is shown here?

Answer:
(a) Rectilinear propagation of light
(b) He made a larger hole instead of a fine hole.
(c) The finer will be the hole the sharper will be the image formation and vice versa.
(d) Soumen got upset easily without looking and inspecting the actual cause, he is bit careless in doing his activity.

In this page, we are providing Motion and Measurement of Distances Class 6 Extra Questions and Answers Science Chapter 10 pdf download. NCERT Extra Questions for Class 6 Science Chapter 10 Motion and Measurement of Distances with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 10 Extra Questions and Answers Motion and Measurement of Distances

Extra Questions for Class 6 Science Chapter 10 The Living Organisms and Their Surroundings with Answers Solutions

Motion and Measurement of Distances Class 6 Extra Questions Very Short Answer Type

Question 1.
Name the invention which made a great change in modes of transport.
Answer:
Invention of wheel.

Question 2.
What kind of motion produce sound?
Answer:
Vibratory motion

Question 3.
What is the full form of SI unit?
Answer:
International System of unit.

Question 4.
Name the ancient modes of measurement.
Answer:
Handspan, cubit, finger, fathom, pace, etc.

Question 5.
Which power was used to pull vehicles in ancient times?
Answer:
Animal power

Question 6.
Name the two parts which must be mentioned to state the result of a measurement.
Answer:
Magnitude and unit.

Question 7.
What type of measuring device would you use to measure the girth of a tree?
Answer:
Measuring tape

Question 8.
Which system of measurement is used now-a-days?
Answer:
SI system

Question 9.
Name the SI unit of length.
Answer:
Metre (m)

Question 10.
Which unit of length is used for measuring very small distance?
Answer:
Millimetre (mm)

Question 11.
Which unit of length is used for measuring larger distances?
Answer:
Kilometre (km)

Question 12.
Which unit of measurement is used to measure the quantity of milk?
Answer:
Litre or millilitre

Question 13.
Give an example of circular motion.
Answer:
The movement of earth around the sun.

Question 14.
What type of motion do the vehicle on a straight road have?
Answer:
Rectilinear motion

Question 15.
What type of motion is shown by the wheel of a bicycle?
Answer:
Circular motion

Question 16.
State the type of motion exhibited by a falling stone.
Answer:
Rectilinear motion

Question 17.
Give one example of rotational motion.
Answer:
The spinning of earth on its axis.

Question 18.
Name two devices which are commonly used for measuring length.
Answer:
Ruler and measuring tape.

Question 19.
What is a fixed quantity called?
Answer:
Unit

Question 20.
When was SI unit recommended by the general conference of weights and measures?
Answer:
1960

Motion and Measurement of Distances Class 6 Extra Questions Short Answer Type

Question 1.
What is measurement?
Answer:
Measurement is defined as the comparison of some unknown quantity with a fixed quantity of the same kind.

Question 2.
What is a standard unit?
Answer:
A standard unit is a standard measure that has some definite and convenient quantity in it so that it remains the same wherever and by whoever it is used.

Question 3.
Define rest and motion.
Answer:
Rest: The object which do not change their positions with the time are said to be at rest.
Motion: The object which change their position with time are said to be in motion.

Question 4.
Why it is important to know how far a place is?
Answer:
It is important to know how far a place is, so that we can have an idea how we are going to reach that place, i.e., by walking, taking a bus or train, a ship, an aeroplane or even a spacecraft.

Question 5.
What is meant by rectilinear motion? Give two examples.
Answer:
The motion in a straight line is called rectilinear motion. For example, motion of a bullet fired from gun and motion of a stone falling down from a height.

Question 6.
Define periodic motion. State two examples.
Answer:
The motion which repeats itself after regular intervals of time, is called periodic motion. The two examples are
(i) revolution of moon around the earth and
(ii) revolution of earth around the sun.

Question 7.
Give one example each of the following types of motion:
(a) Linear
(b) Rotational
(c) Circular
(d) Periodic
Answer:
(a) Linear: Motion of a falling stone
(b) Rotational: The motion of a spinning top
(c) Circular: The movement of moon around the earth
(d) Periodic: The motion of a second’s hand of a watch

Question 8.
How is time related to motion?
Answer:
Motion and time are inseparable part. Motion is change in the position of an object with respect to time. In absence of time it will be hard to determine the motion of an object.

Motion and Measurement of Distances Class 6 Extra Questions Long Answer Type

Question 1.
What is meant by a standard unit of measurement? Why is it necessary to have standard units of measurement? Name the SI unit of length. Write its symbol.
Answer:
A unit of measurement which has a fixed value and does not change from person to person or place to place, is called a standard unit of measurement. It is necessary to have standard units of measurements for the sake of uniformity in measurement. The SI unit of length is metre. Its symbol is m.

Question 2.
State the procedures for the measurement of length using a metre scale.
Answer:
While measuring length using a metre scale, we must follow the steps given below:

1. The ruler should be kept along the length of the object so that the zero mark on the ruler coincides with the one end of the object. The ruler should be parallel to one of the edges.
2. While taking the measurement, the eyes should be correctly positioned. The eye must be exactly vertically above the point where the measurement is to be taken.
3. If the edge of the ruler is worn out or broken, the measurement should be taken from any other full mark of the ruler.

Question 3.
What are the reasons for which SI system is recommended?
Answer:
SI system is recommended for the following reasons:

1. It is standardised unit, therefore, it is accepted universally.
2. Even minute measurements are possible in this system.
3. Interconversions within the system make calculation easy.
4. The units do not change with time or place.

Question 4.
What is meant by (a) circular motion and (b) rotational motion? Give two examples of circular motion and two examples of rotational motion.
Answer:
(a) Circular motion: When an object moves along a circular path, it is called a circular motion.
Example:
(i) The movement of moon around the earth
(ii) The movement of earth around the sun

(b) Rotational motion: When an object twines or spins about a fixed axis, it is called rotational motion.
Example:
(i) The motion of a spinning top
(ii) The spinning of earth on its axis.

Question 5.
How will you measure the length of any curved line using a divider?
Answer:
Let there be a curved line AB (Fig. 10.8). Open the legs of the divider to cover some convenient distance. Place one leg of the divider at one end of the curved line and put the other leg on the line.

Now count the number of times the divider has to be taken along the line to cover the entire length of line AB. At the end, some portion of line may be left out, being less than the distance between the two legs. Measure it separately by adjusting the divider. Multiply the number of complete steps by the distance between the two legs. Add the length of the remaining distance to this length. You will get the total length of the curved line.

Motion and Measurement of Distances Class 6 Extra Questions HOTS

Question 1.
If you are given a woollen thread and a cotton thread and asked to measure the length of a curved line which thread will you prefer?
Answer:
Cotton thread will be preferred over woollen thread as it neither sinks nor extends and will give comparatively accurate result.

Question 2.
Would the distance of the stone from your hand will be same when you whirl it around? Give reason.
Answer:
Yes because the length of the string with which we have hold the stone is not changing.

Question 3.
Can you think of some objects which are exhibiting more than one type of motion? Also mention the type of motion in them.
Answer:
A cycle shows both rotational as well as rectilinear motion.

Motion and Measurement of Distances Class 6 Extra Questions Value-Based (VBQs)

Question 1.
Rahul and Sonia were playing with blocks and each of them made a train out of them. Both of them thought of measuring the length of the train using their handspan. By that time Rahul’s friend Anupam came and suggested them to measure with a measuring tape for fair result.
(a) What is a handspan?
(b) Why Anupam asked both of them to use measuring tape?
(c) What value of Anupam is shown here?
Answer:
(a) The distance between the tip of the thumb and tip of the little finger of a fully stretched hand is called handspan.
(b) To get the accurate result which is not possible with the handspan.
(c) Anupam is an intelligent and active boy.

Question 2.
Ishika was asked by her teacher to measure the length of the line drawn on the blackboard. She immediately took out her scale to measure the line. But she noticed that the end of her scale is broken. She felt very sad and said to the teacher that she would not be able to measure the length of the line. Teacher consoled her and taught her a new method of measuring line using the same scale.
(a) What is a scale?
(b) Name devices that can be used to measure length.
(c) What new method of measuring line by using a broken scale was taught by Ishika’s teacher?
(d) What values of Ishika is shown here?
Answer:
(a) A straight strip of wood, metal or plastic used for drawing straight line and measuring length.
(b) Measuring tape and ruler.
(c) If the end of a scale is broken, one can use any full mark of the scale and then subtract the reading of this mark from the reading at the other end.
(d) She got nervous easily and sensitive.

In this page, we are providing The Living Organisms and Their Surroundings Class 6 Extra Questions and Answers Science Chapter 9 pdf download. NCERT Extra Questions for Class 6 Science Chapter 9 The Living Organisms and Their Surroundings with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 9 Extra Questions and Answers The Living Organisms and Their Surroundings

Extra Questions for Class 6 Science Chapter 9 The Living Organisms and Their Surroundings with Answers Solutions

The Living Organisms and Their Surroundings Class 6 Extra Questions Very Short Answer Type

Question 1.
Name the process by which living things obtain energy from food.
Answer:
Respiration

Question 2.
Name two aquatic plants which are completely submerged in water.
Answer:
Lily and lotus

Question 3.
Name two terrestrial habitats.
Answer:
Deserts, mountains

Question 4.
What are two components of the habitat?
Answer:
(i) Biotic components
(ii) Abiotic components

Question 5.
Name one characteristic which tells us that seeds are living things.
Answer:
They grow into a plant when get favourable conditions.

Question 6.
Name two animals which live in the arboreal habitat.
Answer:
(i) Birds
(ii) Monkey

Question 7.
Mention few aquatic plants found in a pond.
Answer:
Water hyacinth, water lily, lotus, Hydrilla, etc.

Question 8.
Name the habitats of following plants:
(a) Cactus
(b) Hydrilla
Answer:
(a) Cactus: Desert
(b) Hydrilla: Aquatic

Question 9.
Name some plants which live in dry areas.
Answer:
Plants like cactus, Acacia, pine, prickly pear live in dry areas.

Question 10.
Name two aquatic habitats.
Answer:
Oceans, ponds

Question 11.
Write the names of two sea animal which have nostrils.
Answer:
Dolphins and whales

Question 12.
What is stimuli?
Answer:
The changes in our surrounding that makes us respond to them are called stimuli.

Question 13.
How does gills help a fish?
Answer:
Gills help fish to take-up oxygen dissolved in water.

Question 14.
Name an animal in which the exchange of gases, during respiration, take place through its skin.
Answer:
The earthworm breathes through the skin.

Question 15.
Name one animal which is adapted to live in water as well as land.
Answer:
Frog

The Living Organisms and Their Surroundings Class 6 Extra Questions Short Answer Type

Question 1.
What is adaptation?
Answer:
The change in specific features or certain habits, which enables a plant or an animal to live in its surroundings is called adaptation.

Question 2.
Define ecology.
Answer:
The study of relationship between living organism and their surroundings is called ecology.

Question 3.
What is environment?
Answer:
Our physical surrounding is called environment.

Question 4.
What is ocean?
Answer:
A very large body of salt water that covers nearly three-fourths of the surface of the earth is called ocean.

Question 5.
Where does a camel lives?
Answer:
A camel lives in a hot desert where there is scarcity of water.

Question 6.
What is habitat?
Answer:
The place or surroundings where a plant or an animal lives is called its habitat.

Question 7.
What is terrestrial habitat?
Answer:
A land based habitat is called a terrestrial habitat.

Question 8.
What is acclimatisation?
Answer:
Small changes that take place in the body of a single organism over short periods, to overcome small problems due to changes in the surroundings, is called acclimatization.

Question 9.
What is reproduction?
Answer:
The process by which living organisms produce new member of their species is called reproduction.

Question 10.
What is excretion?
Answer:
The removal of waste substances from the body of a living organism is called excretion.

Question 11.
What are organisms?
Answer:
The living things are called organisms.

Question 12.
What are biotic components?
Answer:
The living things such as plants, animals and microorganisms in a habitat are its biotic components.

Question 13.
Explain abiotic components.
Answer:
Various non-living things such as rocks, soil, air and water in a habitat constitute its abiotic components.

Question 14.
Why do fish have slippery scales on their bodies?
Answer:
These scales protect the fish from external damage from sharp objects and also help in easy movement through water.

Question 15.
Give three adaptive features in desert plants.
Answer:

1. Well developed root systems.
2. Leaves either very small or converted to spines.
3. Stem is green and fleshy in some plants to carry out photosynthesis.

The Living Organisms and Their Surroundings Class 6 Extra Questions Long Answer Type

Question 1.
List the important characteristics of living things.
Answer:
Following are the important characteristics of living things:

1. Living things need food, air and water.
2. Living things grow.
3. Living things reproduce themselves.
4. Living things respire.
5. Living things are made up of living cells.
6. Living things excrete.
7. Living things have a definite lifespan.

Question 2.
How does the desert animals prevent the loss of water from their body?
Answer:

1. Many animals living in desert remain inactive during the day and become active during night to prevent the loss of water from their body. Such animals are called nocturnal.
2. Certain animals hide themselves in burrows with gelatinous secretion and sleep for about 8 to 9 months in a year. This is called aestivation or summer sleep.

Question 3.
How are plants adapted to aquatic habitat?
Answer:

1. In aquatic plants, roots are much reduced in size and their main function is to hold the plant on its place.
2. The stems may be reduced or long, slender, flexible and spongy. The air spaces in spongy stems make them buoyant.
3. The leaves are thin, large and flat with waxy surface as in lotus and water lily. This protects leaves from wetting and decaying.
4. The leaves of submerged plants are thin and narrow. Hydrilla and Vallisneria are submerged plants and have thin and narrow leaves. Such leaves allow the water to flow without damaging them.

Question 4.
What is respiration?
Answer:
All the living things need energy to grow, move and stay alive. They get this energy from food through respiration. Respiration is the chemical process in which food taken by an organism combines with oxygen to release energy. This energy is used by the organism to carry out its various life processes. Carbon dioxide and water are the other products of the process of respiration.

Question 5.
What is habitat? Explain briefly.
Answer:
All the living organisms (plants and animals) prefer to live in those places which are best suited to their needs. The place or surroundings where a plant or an animal live is called its habitat.

Habitat can be divided into two main groups:
(i) Terrestrial habitat
(ii) Aquatic habitat
A land based habitat is called terrestrial habitat and a water based habitat is called aquatic habitat.

Question 6.
Differentiate between biotic and abiotic components.
Answer:

Question 7.
Differentiate between xerophytes and hydrophytes.
Answer:

The Living Organisms and Their Surroundings Class 6 Extra Questions HOTS

Question 1.
What is acclimatization? How it differs from adaptation?
Answer:
Small changes in an organism to overcome small changes in the surrounding is called acclimatization. Whereas adaptation is permanent ability of an organism to make themselves suitable for living in a particular environment. Adaptation is slow and gradual process whereas acclimatization is comparatively a quick method.

Question 2.
Can you name some plant parts, apart from seed, which give rise to a new plant?
Answer:
Leaves, stem, bulb, offset, corm, etc., of some plants can give rise to a new plant.

Question 3.
Is seed a living thing?
Answer:
Yes, seed is a living thing as it has living embryo in it. It is in dormant state which could be break by subjecting it to favourable conditions.

Question 4.
Differentiate between aestivation and hibernation.
Answer:

Question 5.
Why do mountaineers carry oxygen cylinders with them?
Answer:
As we go higher the air gets less dense. There is lack of supply of oxygen. Thus, mountaineers carry oxygen cylinders with them.

The Living Organisms and Their Surroundings Class 6 Extra Questions Value-Based (VBQs)

Question 1.
Radha while learning about the characteristics of living organisms studied that living organism excrete their waste out of the body. She remembered that plants are also living organisms. But she wondered how plants excrete their waste. She searched in internet to solve her query.
(a) What are the characteristics of living organisms?
(b) Which component is constituted by plants?
(c) How do plant excrete their waste materials?
(d) What value of Radha is shown here?
Answer:
(a) Living organisms can

1. grow
2. reproduce
3. excrete
4. respire
5. move
6. show response to stimuli

(b) Biotic component
(c) In plants different modes of excretion are present. They loses their gaseous waste through their stomata. Deciduous plants transfer their toxic waste to the leaves which fall on maturity. Excess water is lost through transpiration.
(d) Radha is curious, responsible and hardworking.

Question 2.
Gita lives in Tamil Nadu. Her family planned to visit a hilly area during her school vacation. She was so excited. When she reached there, she experienced breathing problem while walking or running. She got worried that something might have happened to her. But her father consoled her and said, that this is normal and she will be fine after few days of staying there.
(a) Why does Gita experience breathing problem in hilly area?
(b) How will she be fine after some days?
(c) What do this process of adjusting to environment called?
(d) What values of Gita’s father is shown here?
Answer:
(a) In hilly areas oxygen level is very low. So, Gita experienced breathing problem.
(b) Her body will make small changes, like increased red blood cells, to cope with decreased amount of oxygen.
(c) Acclimatisation
(d) Gita’s father is caring, loving, responsible and have scientific aptitude.

In this page, we are providing Body Movements Class 6 Extra Questions and Answers Science Chapter 8 pdf download. NCERT Extra Questions for Class 6 Science Chapter 8 Body Movements with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 8 Extra Questions and Answers Body Movements

Extra Questions for Class 6 Science Chapter 8 Body Movements with Answers Solutions

Body Movements Class 6 Extra Questions Very Short Answer Type

Question 1.
What is the name of small bone which make up backbone?
Answer:
Vertebrae

Question 2.
Name the bones which protect the heart from all sides.
Answer:
Breastbone from front and the backbone at the back make a type of box to protect the heart.

Question 3.
Which is the longest bone in our body?
Answer:
Femur

Question 4.
Does the shoulder bone also move when you move your arm?
Answer:
No

Question 5.
Do the bones on the top of the skull move?
Answer:
No, they do not move.

Question 6.
Do the bones of upper jaw move?
Answer:
No, they do not move.

Question 7.
At which point does the arm rotates?
Answer:
The arm rotates on the round pit like structure.

Question 8.
How many types of joints are there in our body?
Answer:
There are five types of joints in our body.

Question 9.
How many pairs of wing does a cockroach have?
Answer:
A cockroach has two pairs of wings which are attached to its breast by flight muscles.

Question 10.
How many parts are there in our arm? Name them.
Answer:
Our arm consists of two parts, the upper arm and the lower arm which are joined at the elbow.

Question 11.
What helps the fish to move through water with low resistance?
Answer:
The streamlined shape of the body enables a fish to move through water with low resistance.

Question 12.
Write the names of three animals that have streamlined body.
Answer:
(i) Fish
(ii) Birds
(iii) Snake

Question 13.
If you tie a scale with your arm, are you able to bend your elbow? Why?
Answer:
No because it prevents functioning of elbow joint.

Question 14.
What is a group of similar cells with same kind of function called?
Answer:
Tissues

Question 15.
What is cartilage?
Answer:
The bone like structure which is soft and elastic in nature and can be bent is called cartilage.

Body Movements Class 6 Extra Questions Short Answer Type

Question 1.
What do bones of a skeleton do?
Answer:
The bones of skeleton provide a framework which give shape and holds our body together.

Question 2.
Name the two types of body movements shown by human beings and other animals.
Answer:
Human beings and other animals show two types of body movements.

• The movements of the body parts (e.g., mouth, head, backbone, arms, hands, legs and feet).
• The movement of the whole body from one place to another.

Question 3.
What are ribs?
Answer:
The chest bones are called ribs. They are the curved bones in our chest.

Question 4.
What is cartilage?
Answer:
At some places in the skeleton there is a material which is tough but not as hard as bones and can be bent. It is called cartilage.

Question 5.
Name the places in our body where cartilage are present.
Answer:

1. Cartilage is present in the pinnae (outer parts) of ears.
2. It is found at the end of nose.
3. It is found on the end of bones where they meet one another at a joint.
4. It is also present as cartilage discs between the vertebrae of the backbone.

Question 6.
What is shoulder?
Answer:
Shoulders are the part of the body to which our arms are attached.

Question 7.
How does a fish swim in water?
Answer:
When a fish swims, its front part curves to one side and the tail part also changes its position to another side. The tail fin helps in changing the direction.

Question 8.
What is skull? What is it made of?
Answer:
The bony parts of our head is called the skull. The skull is made of 22 bony plates joined together.

Question 9.
What is backbone?
Answer:
The backbone is a long hollow, rod like structure running from the neck to the hips, inside our body. The scientific name of backbone is vertebral column.

Question 10.
What is hinge joint?
Answer:
A hinge joint is the joint which allows movement only in one direction forward and backwards.

Body Movements Class 6 Extra Questions Long Answer Type

Question 1.
What is a muscle? Explain how it helps in movement.
Answer:
A muscle is the fibrous tissue in the body that has an ability to contract (when asked to do so by the brain). When a muscle contracts, it shortens (becomes smaller). Muscles are attached to the bones of our skeleton through a long fibre called tendon.

Muscle always work in pairs. When one muscle of a pair contracts, then the other muscle of a pair is relaxed. A contracted muscle can come back to its original position only when the other muscle of the pair contracts.

Question 2.
How many types of joints are there? Explain each of them.
Answer:
The main types of joints in the human are:

1. Hinge joint
2. Ball and socket joint
3. Pivot joint
4. Fixed joint

(i) Hinge joint: A hinge joint is the joint which allows movement in only one direction, i.e., forward and backward.
(ii) Ball and socket joint: In the ball and socket joint, one end of the bone has a round shape like a ‘ball’ which fits into a ‘socket’ (hollow space) in the other bone. Such joint allow movement in all directions, e.g., shoulder and hip joints.
(iii) Pivot joint: In a pivot joint, a cylindrical bone turns in a ring-type bone. The pivot joint allows movement in forward and backward and right and left, e.g., neck joint.
(iv) Fixed joint: In some joints, the bones are held so tightly together that they cannot move at all.

Question 3.
What is skeleton? State its functions.
Answer:
The skeleton consists of skull, backbone, ribs, breastbone, shoulder bones, hip bones, arm bones and leg bones. The human skeleton consists of a strong backbone which has skulls at its top end.

Following are the functions of skeleton:

1. The skeleton holds the whole body together and gives it a shape.
2. It protects many delicate internal organs of the body from damage.
3. It provides numerous points for the attachment of the muscles of the body.
4. Along with muscles, the skeleton helps in the movement of body parts and locomotion.

Question 4.
What is dislocation and fracture of bone? What precaution should one take when one gets a fracture?
Answer:
Any careless sudden movement a jump, fall or knock may cause an injury to the skeleton. It may be a dislocation or a fracture. In case of dislocation the bones at the joint are dislodged from their normal position. The ligaments may be torn apart or injured causing pain and swelling.

A fracture is a break in the bone. The break may be of a hair line crack or serious break in one or more points. Fracture also causes pain and swelling. In all these cases, the patient should soon be taken to a doctor or hospital.

Following precautions should be taken when one gets a fracture:

1. Never try to reset the bones on your own.
2. Place the injured part in a comfortable position.
3. Care should be taken to avoid jerk or movement of the injured part.

Question 5.
How a bone is formed? What kind of food should we take for proper growth and upkeep of bones?
Answer:
Before our birth the skeleton forms a soft and elastic piece of cartilage. Some of these cartilages, not all, are changed to bones. With the deposition of a substance containing calcium and phosphorus, the bones become hard and strong.

When a baby is born, its skeleton is soft. With the growth and development, bones become hard. At old age, the bones become hard and brittle.

For proper growth and upkeep of bones we need to take food which are rich in calcium and phosphorus, vitamins and proteins. Milk, curd, fruits, vegetables and eggs contain the needed nutrients.

Body Movements Class 6 Extra Questions HOTS

Question 1.
What is the difference between locomotion and movement?
Answer:
(i) Movement is an act of change in position or location of any part of an organism whereas locomotion is change in place of the whole body of an organism, from one to other.
(ii) Movement is shown by both plants and animals whereas locomotion is shown by only animals.

Question 2.
What will happen if our backbone is made of one single long bone instead of so many vertebrae?
Answer:
We will not be able to twist, turn and bend as we do it now.

Question 3.
How many bones are there in a newborn baby? How it becomes 206 bones by adulthood?
Answer:
There are approx. 305 bones in a newborn baby. Most of the bones fuses together to form single bone by the time of adulthood. So, it become 206 bones by adulthood.

Question 4.
What do you understand by brittle bone?
Answer:
By the time a person grew older, his body may reabsorb calcium and phosphate from the bones instead of keeping these minerals in the bones. Thus bones become weaker and can break easily without any obvious injury.

Question 5.
What do you think will happen if our body have as many number of movable joints as the number of bones?
Answer:
Too many numbers of movable joints can also make our work difficult. We may not walk or do our daily chores properly and easily.

Body Movements Class 6 Extra Questions Value Based Question (VBQs)

Sia fractured her leg while playing. Doctor plastered her leg and advised her to take calcium tablets and milk regularly. He also asked her to get plenty of sunlight. Sia followed the doctor’s advice.
(a) What is fracture?
(b) Why did the doctor advise Sia to take calcium tablets?
(c) Why did the doctor ask Sia to get plenty of sunlight?
(d) What value of Sia is shown here?
Answer:
(a) A fracture is a broken bone which ranges from thin crack to a complete break.
(b) Calcium tablets will help in quick healing of bones.
(c) Sunlight is the source of Vitamin D which is good to make our bones strong.
(d) Sia is an obedient girl.

Question 2.
Sam went to science laboratory to see the specimen of cockroach and bird wings. He observed many differences in them though both are used for flying. He reported his observation to science teacher. His teacher praised him.
(a) Can you list the differences between wings of cockroach and bird?
(b) How birds are adapted for flying?
(c) How many legs are present in cockroach?
(d) What values of Sam are shown here?
Answer:
(a) Wings of bird have feather and bones. Wings of bird are actually fore limbs of birds. Birds have only one pair of wing. Wings of cockroach do not have feather and bones. It is somewhat translucent. Cockroach have two pairs of wings.
(b) Birds have streamlined body with strong muscles and light bones which make them adaptive for flying.
(c) Cockroach has 3 pairs of legs.
(d) Sam is intelligent, curious, hard working and a good observer.