Prasanna

Check the below NCERT MCQ Questions for Class 9 Science Chapter 13 Why do we Fall Ill with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Why do we Fall Ill Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://mcqquestions.guru/mcq-questions-for-class-9-science-chapter-13/

You can refer to NCERT Solutions for Class 9 Science Chapter 13 Why do we Fall Ill to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Why do we Fall Ill Class 9 MCQs Questions with Answers

Why Do We Fall Ill Class 9 MCQ Question 1.
Which one of the following is not a viral disease?
(a) Dengue
(b) AIDS
(c) Typhoid
(d) Influenza

Answer

Answer: (c) Typhoid

---

Why Do We Fall Ill MCQ Question 2.
Which one of the following is not a bacterial disease?
(a) Cholera
(b) Tuberculosis
(c) Anthrax
(d) Influenza

Answer

Answer: (d) Influenza

---

Class 9 Why Do We Fall Ill MCQ Question 3.
Which one of the following disease is not transmitted by mosquito?
(a) Brain fever
(b) Malaria
(c) Typhoid
(d) Dengue

Answer

Answer: (c) Typhoid

---

Class 9 Science Chapter 13 MCQ Question 4.
Which one of the following disease is not caused by bacteria?
(a) Typhoid
(b) Anthrax
(c) Tuberculosis
(d) Malaria

Answer

Answer: (d) Malaria

---

Class 9 Science Why Do We Fall Ill MCQ With Answers Question 5.
Which one of the following diseases is caused by protozoans?
(a) Malaria
(b) Influenza
(c) AIDS
(d) Cholera

Answer

Answer: (a) Malaria

---

Why Do We Fall Ill Class 9 MCQs Question 6.
Which one of the following has a long term effect on the health of an individual?
(a) Common cold
(b) Chicken pox
(c) Chewing tobacco
(d) Stress

Answer

Answer: (c) Chewing tobacco

---

Why Do We Fall Ill MCQ Questions With Answers Question 7.
Which of the following can make you ill if you come in contact with an infected person?
(a) High blood pressure
(b) Genetic abnormalities
(c) Sneezing
(d) Blood cancer

Answer

Answer: (c) Sneezing

---

Why Do We Fall Ill MCQs Question 8.
AIDS cannot be transmitted by
(a) sexual contact
(b) hugs
(c) breast feeding
(d) blood transfusion

Answer

Answer: (b) hugs

---

Why Do We Fall Ill MCQ Class 9 Question 9.
Making anti-viral drugs is more difficult than making anti-bacterial medicines because
(a) viruses make use of host machinery
(b) viruses are on the border line of living and non-living
(c) viruses have very few biochemical mechanisms of their own
(d) viruses have a protein coat

Answer

Answer: (c) viruses have very few biochemical mechanisms of their own

---

Class 9 Science Ch 13 MCQ Question 10.
Which one of the following causes kala-azar?
(a) Ascaris
(b) Trypanosoma
(c) Leishmania
(d) Bacteria

Answer

Answer: (c) Leishmania

---

MCQ On Why Do We Fall Ill Question 11.
If you live in a overcrowded and poorly ventilated house, it is possible that you may suffer from which of the following diseases:
(a) Cancer
(b) AIDS
(c) Air borne diseases
(d) Cholera

Answer

Answer: (c) Air borne diseases

---

Ch 13 Science Class 9 MCQ Question 12.
Which disease is not transmitted by mosquitoes?
(a) Dengue
(b) Malaria
(c) Brain fever or encephalitis
(d) Pneumonia

Answer

Answer: (d) Pneumonia

---

Class 9 Science Chapter 13 MCQ With Answers Question 13.
Which one of the following is not important for individual health?
(a) Living in clean space
(b) Good economic condition
(c) Social equality and harmony
(d) Living in a large and well furnished house

Answer

Answer: (d) Living in a large and well furnished house

---

Why Do We Fall Ill Class 9 MCQ Pdf Question 14.
Choose the wrong statement.
(a) High blood pressure is caused by excessive weight and lack of exercise.
(b) Cancers can be caused by genetic abnormalities.
(c) Peptic ulcers are caused by eating acidic food.
(d) Acne in not caused by staphylococci.

Answer

Answer: (c) Peptic ulcers are caused by eating acidic food.

---

MCQ Of Ch 13 Class 9 Science Question 15.
We should not allow mosquitoes to breed in our surroundings because they
(a) multiply very fast and cause pollution
(b) are vectors for many diseases
(c) bite and cause skin diseases
(d) are not important insects

Answer

Answer: (b) are vectors for many diseases

---

Question 16.
You are aware of Polio Eradication Programme in your city. Children are vaccinated because
(а) vaccination kills the polio causing microorganisms
(b) prevents the entry of polio causing organism
(c) it creates immunity in the body
(d) all the above

Answer

Answer: (c) it creates immunity in the body

---

Question 17.
Viruses, which cause hepatitis, are transmitted through
(a) air
(b) water
(c) food
(d) personal contact

Answer

Answer: (b) water

---

Question 18.
Vectors can be defined as
(a) animals carry the infecting agents from sick person to another healthy person
(b) microorganisms which cause many diseases
(c) infected person
(d) diseased plants

Answer

Answer: (a) animals carry the infecting agents from sick person to another healthy person

---

Fill in the blanks

1. Pneumonia is an example of ……………. disease.

Answer

Answer: Communicable

---

2. Many skin diseases are caused by ………………

Answer

Answer: Fungi

---

3. Antibiotics commonly block biochemical pathways important for the growth of ……………..

Answer

Answer: Bacteria

---

4. Living organisms carrying the infecting agents from one person to another are called …………….

Answer

Answer: Vector

---

5. …………… disease continues for many days and causes effect the on body.

Answer

Answer: Chronic, long-term

---

6. ……………. disease continues for a few days and causes short term effect on the body.

Answer

Answer: Acute

---

7. …………… is defined as physical, mental and social well-being and comfort.

Answer

Answer: Health

---

8. Common cold is an ……………. disease.

Answer

Answer: Infectious

---

9. Many skin diseases are caused by …………….

Answer

Answer: Fungi

---

Match the following columns

Column I	Column II
(a) Kala-azar	(i) Staphylococci
(b) Jaundice	(ii) Antibiotic
(c) Sleeping sickness	(iii) Female anopheles
(d) Acne	(iv) Sexually transmitted disease
(e) Virus	(v) Leishmania
(f) Vector	(vi) Trypanosoma
(g) Penicillin	(vii) Liver
(h) Plasmodium	(viii) SARS
(i) Syphilis	(ix) Malaria

Answer

Answer:

Column I	Column II
(a) Kala-azar	(v) Leishmania
(b) Jaundice	(vii) Liver
(c) Sleeping sickness	(vi) Trypanosoma
(d) Acne	(i) Staphylococci
(e) Virus	(viii) SARS
(f) Vector	(iii) Female anopheles
(g) Penicillin	(ii) Antibiotic
(h) Plasmodium	(ix) Malaria
(i) Syphilis	(iv) Sexually transmitted disease

---

We hope the given NCERT MCQ Questions for Class 9 Science Chapter 13 Why do we Fall Ill with Answers Pdf free download will help you. If you have any queries regarding Why do we Fall Ill CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Check the below NCERT MCQ Questions for Class 9 Science Chapter 12 Sound with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Sound Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://mcqquestions.guru/mcq-questions-for-class-9-science-chapter-12/

You can refer to NCERT Solutions for Class 9 Science Chapter 12 Sound to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Sound Class 9 MCQs Questions with Answers

Sound Class 9 MCQ Chapter 12 Question 1.
Note is a sound
(a) of mixture of several frequencies
(b) of mixture of two frequencies only
(c) of a single frequency
(d) always unpleasant to listen

Answer

Answer: (c) of a single frequency

---

Sound MCQ Class 9 Chapter 12 Question 2.
A key of a mechanical piano struck gently and then struck again but mush harder this time. In the second case
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected

Answer

Answer: (a) sound will be louder but pitch will not be different

---

MCQ On Sound Class 9 Chapter 12 Question 3.
In SONAR, we use
(a) ultrasonic waves
(b) infrasonic waves
(c) radio waves
(d) audible sound waves

Answer

Answer: (c) radio waves

---

MCQ Of Sound Class 9 Chapter 12 Question 4.
Sound travels in air if
(а) particles of medium travel from one place to another
(b) there is no moisture in the atmosphere
(c) disturbance moves
(d) both particles as well as disturbance travel from one place to another.

Answer

Answer: (d) both particles as well as disturbance travel from one place to another.

---

Class 9 Science Chapter 12 MCQ Question 5.
When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength

Answer

Answer: (b) amplitude

---

MCQ Questions On Sound Class 9 Chapter 12 Question 6.
In the curve half the wavelength is

(a) AB
(b) BD
(c) DE
(d) AE

Answer

Answer: (b) BD

---

Class 9 Sound MCQ Chapter 12 Question 7.
Earthquake produces which kind of sound before the main shock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above

Answer

Answer: (a) ultrasound

---

Class 9 Science Chapter 12 MCQ With Answers Question 8.
Infrasound can be heard by
(a) dog
(b) bat
(c) rhinoceros
(d) human beings

Answer

Answer: (c) rhinoceros

---

MCQ Sound Class 9 Chapter 12 Question 9.
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting
(a) intensity of sound only
(b) amplitude of sound only
(c) frequency of the sitar string with the frequency of other musical instruments
(d) loudness of sound

Answer

Answer: (c) frequency of the sitar string with the frequency of other musical instruments

---

II. Fill in the blanks

1. ……………. is a device that uses ultrasonic waves to measure the distance, direction and speed of underwater bodies.

Answer

Answer: SONAR

---

2. The technique of obtaining images of internal organs of the body by using ultrasonic waves is called …………….

Answer

Answer: ultrasonography

---

3. The technique of obtaining images of heart by using reflection of ultrasonic waves from various parts of heart is called …………….

Answer

Answer: echocardiography

---

4. …………….. is a medical instrument used for listening to sound produced withing the body, chiefly in the heart or lungs.

Answer

Answer: Stethoscope

---

5. Sound of frequency below …………… is called infrasonic sound.

Answer

Answer: 20 Hz

---

6. Speed of sound …………… with increase in temperature.

Answer

Answer: increases

---

7. Greater the amplitude of vibration of source the greater is …………… of sound.

Answer

Answer: loudness

---

Match the following columns

Column I	Column II
(a) Pinna	(i) 20 Hz-20 KHz
(b) Cochlea	(ii) Frequency above 20 KHz
(c) Audible range of frequency	(iii) Shrill in nature
(d) Repetition of sound of a source by reflection	(iv) Collects sound from surroundings
(e) Ultrasound	(v) Mechanical wave
(f) Sound wave	(vi) Image of heart using reflection of ultrasonic waves
(g) High frequency sound	(vii) Echo
(h) Electrocardiography	(viii) Converts pressure variation into electric signal

Answer

Answer:

Column I	Column II
(a) Pinna	(iv) Collects sound from surroundings
(b) Cochlea	(viii) Converts pressure variation into electric signal
(c) Audible range of frequency	(i) 20 Hz-20 KHz
(d) Repetition of sound of a source by reflection	(vii) Echo
(e) Ultrasound	(ii) Frequency above 20 KHz
(f) Sound wave	(v) Mechanical wave
(g) High frequency sound	(iii) Shrill in nature
(h) Electrocardiography	(vi) Image of heart using reflection of ultrasonic waves

---

Complete the crossword given below:

Across
1. Medical instrument used for listening to sounds produced within the body, chiefly in the heart and lungs.
4. Thin membrane vibrates when sound reaches inside ear.
6. The wave in which particle of medium vibrates in the direction perpendicular to the direction propagation of the wave.
8. The phenomenon of repetition of sound by reflection from an obstacle.
9. The part of ear which collects sound from surroundings.

Down
2. The technique of obtaining images of the heart by using reflection of ultrasonic waves from various parts of heart.
3. The characteristics which enable us to distinguish one sound from another having same loudness and ptich.
5. Frequency of sound higher than 20 KHz.
7. A device that uses ultrasonic waves to measure the distance, direction and speed of underwater objects.

Answer

Answer:
Across:
1. Stethescope
4. Eardrum
6. Transversal wave
8. Echo
9. Pinna

Down:
2. Echocardiography
3. Timber
5. Ultrasound
7. Sonar

---

We hope the given NCERT MCQ Questions for Class 9 Science Chapter 12 Sound with Answers Pdf free download will help you. If you have any queries regarding Sound CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Check the below NCERT MCQ Questions for Class 9 Science Chapter 11 Work and Energy with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Work and Energy Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://mcqquestions.guru/mcq-questions-for-class-9-science-chapter-11/

You can refer to NCERT Solutions for Class 9 Science Chapter 11 Work and Energy to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Work and Energy Class 9 MCQs Questions with Answers

Work And Energy Class 9 MCQ Question 1.
When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

Answer

Answer: (c) remains constant

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MCQ On Work And Energy Class 9 Question 2.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial

Answer

Answer: (a) does not change

---

Work And Energy Class 9 MCQ With Answers Question 3.
In case of negative work the angle between the force and displacement is (NCERT Exemplar)
(a) 0°
(b) 45°
(c) 90°
(d) 180°

Answer

Answer: (d) 180°

---

Kinetic Energy Calculator is a handy tool that solves the kinetic energy problems easily & quickly.

Class 9 Work And Energy MCQ Question 4.
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are lo m above the ground, they have the same.
(a) acceleration
(b) momenta
(c) potential energy
(d) kinetic energy

Answer

Answer: (a) acceleration

---

Class 9 Science Chapter 11 MCQ Question 5.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)
(a) 6 × 10³ J
(b) 6 J
(c) 0.6 J
(d) zero

Answer

Answer: (d) zero

---

MCQ Of Work And Energy Class 9 Question 6.
Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour

Answer

Answer: (c) kilowatt

---

Work And Energy MCQ Class 9 Question 7.
The work done on an object does not depend upon the
(a) displacement
(b) force applied
(c) angle between force and displacement
(d) initial velocity of the object

Answer

Answer: (d) initial velocity of the object

---

Work And Energy Class 9 MCQ Questions With Answers Question 8.
Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

Answer

Answer: (d) potential energy

---

Class 9 Science Ch 11 MCQ Question 9.
A body is falling from a height h. After it has fallen a height \(\frac{h}{2}\), it will possess
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy

Answer

Answer: (c) half potential and half kinetic energy

---

MCQ Work And Energy Class 9 Question 10.
The number of joules contained in 1 kWh is
(a) 36 × 10⁵ J
(b) 3.6 × 10⁷ J
(c) 36 × 10⁸ J
(d) 3.7 × 10⁷ J

Answer

Answer: (a) 36 × 10⁵ J

---

Work Energy And Power Class 9 MCQ Question 11.
Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B?
(a) 1 : 2
(b) 1 : 4
(c) 2 : 1
(d) 14 : 1

Answer

Answer: (c) 2 : 1

---

MCQ Questions On Work And Energy Class 9 Question 12.
Which of the following graphs best represents graphical relation between momentum P and kinetic energy K for a body in motion?

Answer

Answer: (d)

---

Work And Energy Class 9 MCQ Online Test Question 13.
If speed of a car becomes 2 times, its kinetic energy becomes
(a) 4 times
(b) 8 times
(c) 16 times
(d) 12 times

Answer

Answer: (a) 4 times

---

Ch 11 Science Class 9 MCQ Question 14.
Work done by friction
(a) increases kinetic energy of body
(b) decreases kinetic energy of body
(c) increases potential energy of body
(d) decreases potential energy of body.

Answer

Answer: (b) decreases kinetic energy of body

---

MCQ On Work And Energy Class 9 Pdf Question 15.
When a coil spring is compressed, the work is done on the spring. The elastic potential energy
(a) increases
(b) decreases
(c) disappears
(d) remains unchanged

Answer

Answer: (a) increases

---

Question 16.
One joule work is said to be done when
(a) a force of 1 N displaces a body by 1 cm
(b) a force of 1 N displaces a body by 1 m
(c) a force of 1 dyne displaces a body by 1 m
(d) a force of 1 dyne displaces a body by 1 cm.

Answer

Answer: (b) a force of 1 N displaces a body by 1 m

---

Question 17.
SI unit of power is
(a) watt
(b) joule
(c) newton
(d) metre

Answer

Answer: (a) watt

---

Question 18.
Mechanical energy of a body includes
(a) kinetic energy only
(b) potential energy only
(c) kinetic energy and potential energy
(d) none of these

Answer

Answer: (c) kinetic energy and potential energy

---

Question 19.
Commercial unit of energy is
(a) joule
(b) kWh
(c) watt
(d) newton

Answer

Answer: (b) kWh

---

Question 20.
Potential energy of a body depends on its
(a) position
(b) configuration
(c) position and configuration
(d) mass and velocity

Answer

Answer: (c) position and configuration

---

Fill in the blanks

1. Work done is product of ………….. and distance moved the direction of the force.

Answer

Answer: force

---

2. If the angle between force and displacement is …………. then work done is said to be zero.

Answer

Answer: 90°

---

3. Energy of a body is defined as the capacity or …………. to do work.

Answer

Answer: ability

---

4. Mechanical energy includes ………….. and ……………

Answer

Answer: kinetic energy, potential energy

---

5. Energy can neither be ………….. nor ………….. it can only transformed from one form to another.

Answer

Answer: created, destroyed

---

6. ………….. is defined as the rate of doing work.

Answer

Answer: Power

---

7. Commercial unit of energy is ………………

Answer

Answer: kilowatt hour

---

Match the following columns

Column A	Column B
(a) SI unit of power	(i) 1/2 mv2
(b) Kinetic energy	(ii) The change of one form of energy into another
(c) Potential energy	(iii) watt
(d) SI unit of work	(iv) If applied force on an object and displacement is in opposite direction.
(e) Negative work	(v) Energy possessed by a body due to its position or configuration.
(f) Power	(vi) Joule
(g) Expression of kinetic energy	(vii) Energy possessed by a body due to its motion.
(h) Transformation of energy	(viii) Rate of doing work

Answer

Answer:

Column A	Column B
(a) SI unit of power	(iii) watt
(b) Kinetic energy	(vii) Energy possessed by a body due to its motion.
(c) Potential energy	(v) Energy possessed by a body due to its position or configuration.
(d) SI unit of work	(vi) Joule
(e) Negative work	(iv) If applied force on an object and displacement is in opposite direction.
(f) Power	(viii) Rate of doing work
(g) Expression of kinetic energy	(i) 1/2 mv2
(h) Transformation of energy	(ii) The change of one form of energy into another

---

Crossword Puzzle:

Across:
1. SI unit of work
4. Work done if force is perpendicular to displacement
7. Rate of doing work
8. Energy possessed by a body due to virtue of its motion
Down:
2. Ability to do work
3. Energy possessed by a body due to virtue of its position or configuration
5. Product of force and displacement
6. SI unit of power

Answer

Answer:
Across:
1. Joule
4. Zerowork
7. Power
8. Kinetic energy

Down:
2. Energy
3. Potential energy
5. Work
6. Watt

---

We hope the given NCERT MCQ Questions for Class 9 Science Chapter 11 Work and Energy with Answers Pdf free download will help you. If you have any queries regarding Work and Energy CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Check the below NCERT MCQ Questions for Class 9 Science Chapter 10 Gravitation with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Gravitation Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://mcqquestions.guru/mcq-questions-for-class-9-science-chapter-10/

You can refer to NCERT Solutions for Class 9 Science Chapter 10 Gravitation to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Gravitation Class 9 MCQs Questions with Answers

Gravitation Class 9 MCQ Chapter 10  Question 1.
Two objects of different masses falling freely near the surface of the moon would
(a) have same velocities at any instant
(b) have different acceleration
(c) experience forces of same magnitude
(d) undergo a change in their inertia

Answer

Answer: (a) have same velocities at any instant

---

Gravitation MCQ Class 9 Chapter 10 Question 2.
The value of acceleration due to gravity
(a) is same on equator and poles
(b) is least on poles
(c) is least on equator
(d) increases from pole to equator

Answer

Answer: (c) is least on equator

---

Class 9 Gravitation MCQ Chapter 10  Question 3.
The gravitational force between two objects is F. If masses of both objects are halved without changing the distance between them, then the gravitational force would become
(a) F/4
(b) F/2
(c) F
(d) 2F

Answer

Answer: (a) F/4

---

MCQ On Gravitation Class 9 Chapter 10 Question 4.
A boy is whirling a stone tied to a string in a horizontal circular path. If the string breaks, the stone
(a) will continue to move in the circular path
(b) will move along a straight line towards the centreof the circular path
(c) will move along a straight line tangential to the circular path
(d) will move along a straight line perpendicular to the circular path away from the boy

Answer

Answer: (c) will move along a straight line tangential to the circular path

---

MCQ Of Gravitation Class 9 Chapter 10 Question 5.
An object is put one by one in three liquids having different densities. The object floats with \(\frac{1}{9}\), \(\frac{2}{11}\) and \(\frac{3}{7}\) parts of their volumes outside the liquid surface in liquids of densities d₁, d₂ and d₃respectively. Which of the following statement is correct?
(a) d₁ > d₂ > d₃
(b) d₁ > d₂ < d₃
(c) d₁ < d₂ > d₃
(d) d₁ < d₂ < d₃

Answer

Answer: (d) d₁ < d₂ < d₃

---

Gravitation MCQ Chapter 10 Question 6.
In the relation F = GM mld², the quantity G
(a) depends on the value ofg at the place of observation
(b) is used only when the Earth is one of the two masses
(c) is greatest at the surface of the Earth
(d) is universal constant of nature

Answer

Answer: (d) is universal constant of nature

---

Class 9 Science Chapter 10 MCQ Question 7.
Law of gravitation gives the gravitational force between
(a) the Earth and a point mass only
(b) the Earth and Sun only
(c) any two bodies having some mass
(d) two charged bodies only

Answer

Answer: (c) any two bodies having some mass

---

MCQ Questions On Gravitation For Class 9 Chapter 10 Question 8.
The value of quantity G in the law of gravitation
(a) depends on mass of Earth only
(b) depends on radius of Earth only
(c) depends on both mass and radius of Earth
(d) is independent of mass and radius of the Earth

Answer

Answer: (d) is independent of mass and radius of the Earth

---

Gravitation Class 9 MCQ With Answers Chapter 10  Question 9.
Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be
(a) \(\frac{1}{4}\) times
(b) 4 times
(c) \(\frac{1}{2}\) times
(d) unchanged

Answer

Answer: (b) 4 times

---

MCQ Gravitation Class 9 Chapter 10 Question 10.
The atmosphere is held to the Earth by
(a) gravity
(b) wind
(c) clouds
(d) Earth’s magnetic field

Answer

Answer: (a) gravity

---

Class 9 Physics Gravitation MCQ Chapter 10 Question 11.
The force of attraction between two unit point masses separated by a unit distance is called
(a) gravitational potential
(b) acceleration due to gravity
(c) gravitational field
(d) universal gravitational constant

Answer

Answer: (d) universal gravitational constant

---

Gravitation Class 9 MCQ Questions And Answers Chapter 10 Question 12.
The weight of an object at the centre of the Earth of radius R is (NCERT Exemplar)
(a) zero
(b) infinite
(c) R times the weight at the surface of the Earth
(d) 1/R² times the weight at surface of the Earth

Answer

Answer: (a) zero

---

Class 9 Science Gravitation MCQ Chapter 10 Question 13.
An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be
(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N

Answer

Answer: (a) 2 N

---

Class 9 Science Ch 10 MCQ Question 14.
A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the box will be
(a) maximum when length and breadth form the base
(b) maximum when breadth and width form the base
(c) maximum when width and length form the base
(d) the same in all the above three cases

Answer

Answer: (b) maximum when breadth and width form the base

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MCQs On Gravitation Class 9 Chapter 10 Question 15.
An apple falls from a tree because of gravitational attractionbetween the Earth and the apple. If F₁ is the magnitude of force exerted by the Earth on the apple and F₂ is the magnitude of force exerted by the apple on the Earth, then
(a) F₁ is very much greater than F₂
(b) F₂ is very much greater than F₁
(c) F₁ is only a little greater than F₂
(d) F₁ and F₁ are equal

Answer

Answer: (d) F₁ and F₁ are equal

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Gravitation Class 9 MCQs Chapter 10 Question 16.
The acceleration due to gravity on the Earth depends upon the
(a) mass of the body
(b) mass of the Earth
(c) shape and size of the body
(d) volume of the body

Answer

Answer: (b) mass of the Earth

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Question 17.
When a mango falls from a mango tree then
(a) only the Earth attracts the mango.
(b) only the mango attracts the Earth.
(c) both the mango and the Earth attract each other.
(d) both the mango and the Earth repel each other.

Answer

Answer: (c) both the mango and the Earth attract each other.

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Question 18.
When a ship floats in sea water
(a) The weight of water displaced is greater than the weight of ship
(b) The weight of water displaced is less than the weight of the ship
(c) The weight of water displaced is equal to the weight of the ship
(d) It displaces no water.

Answer

Answer: (c) The weight of water displaced is equal to the weight of the ship

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Question 19.
The SI unit of pressure is
(a) Nm²
(b) N/m
(c) N/m²
(d) N²/m²

Answer

Answer: (c) N/m²

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Question 20.
If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?
(a) The weight of body will become zero but the mass will remain same.
(b) The weight of a body will remain same but the mass will become zero.
(c) Both mass and weight become zero.
(d) Neither mass nor weight becomes zero.

Answer

Answer: (a) The weight of body will become zero but the mass will remain same.

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Fill in the blanks

1. Gravitational force is always ………….. in nature.

Answer

Answer: attractive

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2. …………… of a body is the quantity of matter contained in it.

Answer

Answer: Mass

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3. SI unit of mass is …………….

Answer

Answer: kilogram

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4. Weight of an object is the force with which it is attracted towards the ………………

Answer

Answer: Earth

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5. The acceleration due to gravity of moon is …………… of that of the Earth.

Answer

Answer: one sixth

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6. Every fluid exerts an …………….. force on a body immersed in it. This force is called ……………

Answer

Answer: upward, buoyant

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7. Density of a substance is defined as mass per unit ……………..

Answer

Answer: volume

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8. The force acting on an object …………… to the surface is called thrust.

Answer

Answer: perpendicular

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9. The relative density of a substance is the ratio of its density to that of ……………..

Answer

Answer: water

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Match the following columns

Column A	Column B
(a) SI unit of Weight	(i) Kilogram
(b) mass	(ii) F = \(\frac{Gm_1m_2}{r^2}\)
(c) Weight	(iii) mg
(d) Buoyant force	(iv) newton
(e) Relative density	(v) Ratio of density of the substance to that of water
(f) SI unit of mass	(vi) Quantity of matter contained in a body
(g) Gravitational force between two bodies (expression)	(vii) Force acting on body due to Earth’s attraction
(viii) Weight of an object (expression)	(viii) Upward force on a body placed in a fluid

Answer

Answer:

Column A	Column B
(a) SI unit of Weight	(iv) newton
(b) mass	(vi) Quantity of matter contained in a body
(c) Weight	(vii) Force acting on body due to Earth’s attraction
(d) Buoyant force	(viii) Upward force on a body placed in a fluid
(e) Relative density	(v) Ratio of density of the substance to that of water
(f) SI unit of mass	(i) Kilogram
(g) Gravitational force between two bodies (expression)	(ii) \(\frac{Gm_1m_2}{r^2}\)
(viii) Weight of an object (expression)	(iii) mg

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Complete the crossword given below

Across
3. Quantity of matter contained in a body
4. The property due to which a body immersed in fluid experiences upward force.
5. Acceleration due to gravity of moon is how much time that of Earth
7. Whenever objects fall towards the Earth under gravitational force alone, we say that objects are in
8. The force with which a body is attracted towards the Earth
10. Force of gravitation due to Earth is called
11. Nature of gravitational force is always
Down
1. Force between two bodies due to their masses
2. Thrust on unit area
6. Mass per unit volume
9. SI unit of pressure

Answer

Answer:
Across:
3. Mass
4. Buoyancy
5. One sixth
7. Free fall
8. Weight
10. Gravity
11. Attractive

Down:
1. Gravitational force
2. Pressure
6. Density
9. Pascal

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We hope the given NCERT MCQ Questions for Class 9 Science Chapter 10 Gravitation with Answers Pdf free download will help you. If you have any queries regarding Gravitation CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Check the below NCERT MCQ Questions for Class 9 Science Chapter 9 Force and Laws of Motion with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Force and Laws of Motion Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://mcqquestions.guru/mcq-questions-for-class-9-science-chapter-9/

You can refer to NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Force and Laws of Motion Class 9 MCQs Questions with Answers

Force And Laws Of Motion Class 9 MCQ Question 1.
Which of the following statements is not correct for an object moving along a straight path in an accelerated motion?
(a) Its speed keeps changing
(b) Its velocity always changes
(c) It always goes away from the Earth
(d) A force is always acting on it

Answer

Answer: (d) A force is always acting on it

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Force And Laws Of Motion MCQ Question 2.
According to the third law of motion, action and reaction
(a) always act on the same body
(b) always act on different bodies in opposite directions
(c) have same magnitude and directions
(d) act on either body at normal to each other

Answer

Answer: (b) always act on different bodies in opposite directions

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Class 9 Science Chapter 9 MCQ Question 3.
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to
(a) exert larger force on the ball
(b) reduce the force exerted by the balls on the hands
(c) increase the rate of change of momentum
(d) decrease the rate of change of momentum

Answer

Answer: (d) decrease the rate of change of momentum

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Class 9 Force And Laws Of Motion MCQ Question 4.
The inertia of an object tends to cause the object
(a) to increase its speed
(b) to decrease its speed
(c) to resist any change in its state of motion
(d) to decelerate due to friction

Answer

Answer: (c) to resist any change in its state of motion

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Physics MCQ Questions Class 9 Force And Laws Of Motion With Answers Question 5.
A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is
(a) accelerated
(b) uniform
(c) retarded
(d) along circular tracks

Answer

Answer: (a) accelerated

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Class 9 Science Ch 9 MCQ Question 6.
An object of mass 2 kg is sliding with a constant velocity of 4 ms^-1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
(a) 32 N
(b) 0 N
(c) 2 N
(d) 8 N

Answer

Answer: (b) 0 N
From newton’s Ist law of motion, since there is no external force acting on the object it will remain in its original state of motion. Hence, zero force is required to keep the object moving with constant velocity, correct answer is B.

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Ch 9 Science Class 9 MCQ Question 7.
Rocket works on the principle of conservation of
(a) mass
(b) energy
(c) momentum
(d) velocity

Answer

Answer: (c) momentum

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MCQ Of Force And Laws Of Motion Question 8.
A water tanker filled up to \(\frac{2}{3}\) of its height is moving with a uniform speed. On a sudden application of brakes, the water in the tank would
(a) move backward
(b) move forward
(c) be unaffected
(d) rise upwards

Answer

Answer: (b) move forward

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Force And Laws Of Motion MCQ Class 9 Question 9.
If the mass of a body is doubled and its velocity becomes half, then the linear momentum of the body will
(a) remain same
(b) become double
(c) become half
(d) become four times.

Answer

Answer: (a) remain same

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Class 9 Chapter 9 Science MCQ Question 10.
When a number of forces acting simultaneously on a body bring about a change in its state of rest or of uniform motion in a straight line, then these forces acting on the body are said to be
(a) balanced forces
(b) equal forces
(c) unbalanced forces
(d) opposite forces

Answer

Answer: (d) opposite forces

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MCQ On Force And Laws Of Motion Question 11.
When a car at high speed makes a sharp turn, the driver in a car tends to get thrown to the side opposite to the turn. This is due to the
(a) inertia of motion
(b) inertia of time
(c) inertia of rest
(d) inertia of direction

Answer

Answer: (a) inertia of motion

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MCQ On Force And Laws Of Motion Class 9 Question 12.
A man is standing on a boat in still water. If he walks towards the shore, then the boat will
(a) move away from the shore
(b) move towards the shore
(c) remain stationary
(d) none of these

Answer

Answer: (a) move away from the shore

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Class 9 Ch 9 Science MCQ Question 13.
Which of the following is an incorrect statement?
(a) Mass is measure of inertia of a body.
(b) Newton’s first law of motion is the law of inertia.
(c) Unbalanced force produces constant velocity.
(d) Newton’s third law talks about the direction of the force.

Answer

Answer: (c) Unbalanced force produces constant velocity.

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Chapter 9 Science Class 9 MCQ Question 14.
A ball is thrown vertically upward in a train moving with uniform velocity. The ball will
(a) fall behind the thrower
(b) fall ahead of the thrower
(c) return back to the thrower
(d) fall on the left of the thrower

Answer

Answer: (c) return back to the thrower

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Class 9 Physics Chapter 2 MCQ Question 15.
Which of the following is not an application of conservation of linear momentum?
(a) While firing a bullet, the gun must be held tight to the shoulder
(b) When a man jumps from a boat to the shore
(c) A rocket explodes on midway from the ground
(d) A body suspended from the hook of a spring balanced in a lift which is accelerated downward

Answer

Answer: (c) A rocket explodes on midway from the ground

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Question 16.
When we stop pedalling, the bicycle begins to slow down. This is because of the
(a) Frictional force acting along the direction of motion of bicycle
(b) Air resistance which is in the direction of motion
(c) Frictional force acting opposite to the direction of motion of bicycle by the road
(d) Nature of the bicycle to stop after some time

Answer

Answer: (d) Nature of the bicycle to stop after some time

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Question 17.
Inertia is the property of a body by virtue of which, it cannot change by itself
(a) its state of rest
(b) its steady state of uniform motion
(c) its direction of motion
(d) all of these.

Answer

Answer: (d) all of these.

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Question 18.
An athlete does not come to rest immediately after crossing the winning line due to the
(a) inertia of motion
(b) inertia of rest
(c) inertia of direction
(d) none of these

Answer

Answer: (a) inertia of motion

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Question 19.
A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the magnitude of velocity of the system just after the collision will be
(a) \(\frac{A+B}{AC}\)
(b) \(\frac{A+C}{B+C}\)
(c) \(\frac{AC}{B+C}\)
(d) \(\frac{AB}{A+C}\)

Answer

Answer: (d) \(\frac{AB}{A+C}\)

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Question 20.
The masses of two bodies are in ratio 5 : 6 and their velocities are in ratio 1 : 2. Then their linear momentum will be in the ratio
(a) 5 : 6
(b) 1 : 2
(c) 12 : 5
(d) 5 : 12

Answer

Answer: (d) 5 : 12

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Fill in the blanks

1. The momentum of an object is product of its mass and ……………..

Answer

Answer: velocity

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2. According to second law of motion “the rate of change of momentum is directly proportional to ……………… applied”.

Answer

Answer: force

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3. According to law of conservation of momentum “the total momentum of an isolated system is always ……………..

Answer

Answer: conserved

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4. Recoiling of gun is an example of ………….. law of motion.

Answer

Answer: third

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5. According to third law of motion “to every action there is an equal and ……………… reaction and they act on two different bodies”.

Answer

Answer: opposite

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6. The forces are said to be balanced, if net force is ……………..

Answer

Answer: zero

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7. When a carpet is beaten with a stick, dust particle comes out. This phenomenon is an example of …………….. law of motion.

Answer

Answer: first

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Match the following columns

Column A	Column B
(a) Action and reaction	(i) Balanced forces
(b) Cricket player lowers his hand while catching the ball	(ii) Newton’s first law
(c) Rocket propulsion	(iii) Mass
(d) Resultant force is zero	(iv) Newton’s second law
(e) A ball thrown upward in a train moving with uniform velocity returns to the thrower.	(v) Inertia
(f) SI unit of momentum	(vi) Newton’s third law
(g) Tendency of a body to resist change in its state of motion or rest.	(vii) Conservation of linear momentum
(h) Inertia of a body depends on it	(viii) kg m/s²

Answer

Answer:

Column A	Column B
(a) Action and reaction	(vi) Newton’s third law
(b) Cricket player lowers his hand while catching the ball	(iv) Newton’s second law
(c) Rocket propulsion	(vii) Conservation of linear momentum
(d) Resultant force is zero	(i) Balanced forces
(e) A ball thrown upward in a train moving with uniform velocity returns to the thrower.	(ii) Newton’s first law
(f) SI unit of momentum	(viii) kg m/s²
(g) Tendency of a body to resist change in its state of motion or rest.	(v) Inertia
(h) Inertia of a body depends on it	(iii) Mass

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Complete the crossword given below:

Across:
2. SI unit of force
3. Force which opposes relative motion
5. Measure of inertia
7. First law is also known as law of

Down:
1. Product of mass and velocity
4. Natural tendency of an object to resist a change in its states of motion or rest
6. Magnitude of resultant if forces are balanced

Answer

Answer:
Across:
2. Newton
3. Friction
5. Mass
7. Inertia

Down:
1. Momentum
4. Inertia
6. Zero

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We hope the given NCERT MCQ Questions for Class 9 Science Chapter 9 Force and Laws of Motion with Answers Pdf free download will help you. If you have any queries regarding Force and Laws of Motion CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.