# MCQ Class 9 Science Chapter 10 Gravitation

Check the below Gravitation Class 9 MCQ for Science Chapter 10 with Answers available with PDF free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest syllabus and examination pattern issued by CBSE, NCERT and KVS. Our teachers have provided below Gravitation Class 9 Science MCQs Questions with answers which will help students to revise and get more marks in exams

## Gravitation Class 9 Science MCQ Questions with Answers

Refer below for Gravitation Class 9 MCQ with solutions. Solve MCQ questions and compare them with the answers provided below

Question: The weight of a body of mass 5 kg is
a. 69.0 N
b. 79.0 N
c. 49.0 N
d. 39.0 N

C

Question: Which of the following statements is/are correct?
I. Mass of an object is the measure of its inertia.
II. Heavier the object smaller is the inertia.
III. The mass of an object is variable.
a. Only I
b. I and III
c. II and III
d. I and II

A

Question: If ge is acceleration due to gravity on earth and gm is acceleration due to gravity on moon, then
a. ge = gm
b. ge < gm
c. ge = 1/6 gm
d. ge = 1/6 g

D

Question: The value of G was first determined experimentally by
a. Newton
b. Henry Cavendish
c. Kepler
d. Galileo

C

Question:  When an object is thrown upward, the force of gravity is
a. opposite to the direction of motion
b. in the same direction as the direction of motion
c. becomes zero at the highest point
d. increases as it rises up.

A

Question: Two planets A and B of same mass and same radius are shown in the figure. p1 and p2 are densities of the materials in the planets and p1 > p2. If the accelerations due to gravity on the surfaces of the planets A and B are gA and gB respectively, then

a. gA = gB
b. gA < gB
c. gA > g
d. Given information is not sufficient

A

Question: The mass of a body is increased 4 fold and mass  of other body is increased 16 fold. How should the distance between them be changed to keep the same gravitational force between them?
a. 4 times
b.1/4 times
c. 8 times
d.1/8 times

C

Question: If g0, gh and gd be the acceleration due to gravity at earth’s surface, at height h and at a depth d respectively, then
a. g0 > gh and g0 > gd
b. g0 < gh and g0 < gd
c. g0 > gh and g0 < gd
d. g0 < gh and g0 > gd.

A

Question: A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when the two stones will meet.
a. 4 s
b. 3.6 s
c. 2 s
d. 8 s

A

Question: A person in a spaceship moving in space, experience weightlessness as the value of
a. mass is zero
b. acceleration due to gravity is zero
c. gravitational force is zero
d. none of these

B

Question: Average distance of the earth from the sun is L1. If one year of the earth = D days, one year of another planet whose average distance from the sun is L2 will be

B

Question: Which of the following is correct for mass?
a. It is a vector quantity.
b. It is not a fundamental property of material body.
c. It is the force with which the earth attracts a body.
d. It is the quantity of matter contained in a body.

D

Question: What happens to the acceleration due to gravity with the increase in altitude from the surface of the earth?
a. Increases
b. Decreases
c. First decreases and then increases
d. Remains same

B

Question: The value of acceleration due to gravity is high if
a. mass and radius both are small
b. mass is small and radius is large
c. mass is large and radius is small
d. mass and radius both are large.

C

Question: An astronaut in the orbit in a spacecraft feels weightlessness
a. due to the absence of gravity inside
b. due to the fact that spacecraft has no energy
c. because acceleration in the orbit is equal to acceleration of gravity outside
d. there is no gravity outside

C

Question: An apple falls towards the earth because the earth attracts it. The apple also attracts the earth by the same force. Why do we not see the earth rising towards the apple?
a. Acceleration of the earth is very large when compared to that of apple.
b. Acceleration of the earth is equal to that of apple.
c. Acceleration of the earth is neither high nor too low.
d. Acceleration of the earth is very small when compared to that of apple.

D

Question: According to Kepler’s law the relationship between T (time period of revolution of a planet) and r (the semi-major axis of ellipse) is
a. T2 ∝ r
b. T2 ∝ r2
c. T2 ∝ r–3
d. T ∝ r3/2

D

Question: Particles of masses 2M, m and M are respectively at points A, B and C with AB = 1/2(BC). m is much-much smaller than M and at time t = 0, they are all at rest. At subsequent times before any collision takes place

a. m will remain at rest.
b. m will move towards M.
c. m will move towards 2M.
d. m will have oscillatory motion.

C

Question. The formation of tides in the sea is due to
a. the gravitational pull of the earth on sea water.
b. gravitational force exerted by the sun on the sea water.
c. gravitational force exerted by the moon on sea water.
d. gravitational force exerted by the moon and the sea on sea water.

D

Question. Inverse square law is also called
a. Kepler’s first law.
b. Newton’s second law.
c. Universal law.
d. Gravitational law.

C

Question. The gravitational force of attraction between the earth and the moon is
a. 2.22 × 1020 N
b. 2.02 × 1020 N
c. 2.02 × 1010 N
d. 3.02 × 1020 N

B

Question. When the distance between the two objects is reduced to half, the force of gravitation becomes of the initial value.
a. ½
b. thrice
c. ¼
d. 4 times

D

Question. Value of acceleration due to gravity at the centre of the earth is
a. > 0
b. < 0
c. 9.8 m/s2
d. 0

D

Question. Acceleration due to gravity on the moon is of that on the earth.
a. 1/6th
b. 1/3rd
c. 1/4th
d. 1/5th

A

Question. Acceleration due to gravity on the moon is
a. 9.8 m/s2
b. 1.63 m/s2
c. 1.67 m/s2
d. 1.66 m/s2

B

Question. When a body is dropped from a certain height, acceleration due to gravity is taken as
a. + 9.8 m/s2
b. –9.8 m/s2
c. 0
d. + 9.8 m/s

A

Question. Gravitational force is the
a. strongest force.
b. weakest force.
c. short-range force.
d. non-central force.

B

Question. The acceleration due to gravity
a. has the same value everywhere in space.
b. has the same value everywhere on the earth.
c. varies with the latitude on the earth.
d. is greater on the moon.

C

Question. The value of universal gravitational constant was first determined experimentally by
a. Newton.
b. Galileo.
c. Cavendish.
d. Einstein.

C

Question. The accepted value of G is
a. 6.674 × 10–11 Nm2/kg2
b. 5.674 × 10–11 Nm2/kg2
c. 6.674 × 10–10 Nm2/kg2
d. 6.674 × 10–11 Nm2/kg

A

Question. The weight of a body of mass 10 kg is
a. 98 N
b. 9.8 N
c. 69 N
d. 39 N

A

Question. The value of acceleration due to gravity of earth
a. is the same on equator and poles.
b. is the least on poles.
c. is the least on equator.
d. increases from pole to equator.

C

Question. The statement “All bodies whether light or heavy, fall at the same speed towards the earth” was proposed by
a. Newton.
b. Cavendish.
c. Kepler.
d. Galileo.

D

Question. Which of the following statements is correct in respect of a geostationary satellite
a. It moves in a plane containing the Greenwich meridian
b. It moves in a plane perpendicular to the celestial equatorial plane
c. Its height above the earth’s surface is about the same as the radius of the earth
d. Its height above the earth’s surface is about six times the radius of the earth

D

Question. Newton’s law of gravitation is valid
a. in laboratory
b. only on the earth
c. only in our solar system
d. everywhere

D

Question. When a body is thrown up, the force of gravity is
a. in the upward direction
b. in the downward direction
c. zero
d. in the horizontal direction

B

Question. When an object is thrown upward, the force of gravity is
a. opposite to the direction of motion
b. in the same direction as the direction of motion
c. becomes zero at the highest point
d. increases as it rises up

A

Question. For a satellite escape velocity is 11 km/s. If the satellite is launched at an angle of 60° with the vertical, then escape velocity will be
a. 11 km/s
b. 11 √3 km/s
c. 11/√3 km/s
d. 33 km/s

A

Question. Two satellites A and B go round a planet P in circular orbits having radii 4R and R respectively. If the speed of the satellite A is 3V, the speed of the satellite B will be.
a. 12 V
b. 6 V
c. 4/3 V
d. 3/2 V

B

Question. particles each of mass m are kept at vertices of an equilateral triangle of side L. The gravitational field at centre due to these particles is
a. Zero
b. 23LGM
c. 29LGM
d. 2312LGM

A

Question. Newton’s law of gravitation is valid
a. on the earth only
b. on the moon only
c. in the laboratory only
d. everywhere

D

Question. An astronaut in the orbit in a spacecraft feels weightlessness
a. due to the absence of gravity inside
b. due to the fact that spacecraft has no energy
c. because acceleration in the orbit is equal to acceleration of gravity outside
d. there is no gravity outside

C

Question. The equation F = Gm1m2/r2 is valid for
a. rectangular bodies
b. circular bodies
c. elliptical bodies
d. spherical bodies

D

Question. A ball is dropped from a spacecraft revolving around the earth at a height of 120 km. What will happen to the ball
a. It will continue to move with velocity v along the original orbit of spacecraft
b. It will move with the same speed tangentially to the spacecraft
c. It will fall down to the earth gradually
d. It will go very far in the space

A

Question. An artificial satellite is placed into a circular orbit around earth at such a height that it always remains above a definite place on the surface of earth. Its height from the surface of earth is
a. 6400 km
b. 4800 km
c. 32000 km
d. 36000 km

D

Question. Distance of geostationary satellite from the surface of earth radius(Re = 6400 km) in terms of Re is
a. 13.76 Re
b. 10.76 Re
c. 6.56 Re
d. 2.56 Re

C

Question. Two satellite A and B, ratio of masses 3 : 1 are in circular orbits of radii r and 4r. Then ratio of total mechanical energy of A to B is
a. 1 : 3
b. 3 : 1
c. 3 : 4
d. 12 : 1

D

Question. The orbital velocity of a planet revolving close to earth’s surface is
a. √2gR
b. √gR
c. √2g/R
d. √g/R

B

Question. A satellite is launched into a circular orbit of radius ‘R’ around earth while a second satellite is launched into an orbit of radius 1.02 R. The percentage difference in the time periods of the two satellites is
a. 0.7
b. 1.0
c. 1.5
d. 3

D

Question. Given radius of Earth ‘R’ and length of a day ‘T’ the height of a geostationary satellite is [G–Gravitational Constant, M–Mass of Earth]

C

Question. A geo-stationary satellite is orbiting the earth at a height of 6 R above the surface of earth, R being the radius of earth. The time period of another satellite at a height of 2.5 R from the surface of earth is
a. 10 hr
b. (6/√2)hr
c. 6 hr
d. 6 2 hr

D

Question. If satellite is shifted towards the earth. Then time period of satellite will be
a. Increase
b. Decrease
c. Unchanged
d. Nothing can be said

B

Question. The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to four times the previous value, the new time period will become
a. 20 hours
b. 10 hours
c. 80 hours
d. 40 hours

D

Question. A satellite moves round the earth in a circular orbit of radius R making one revolution per day. A second satellite moving in a circular orbit, moves round the earth once in 8 days. The radius of the orbit of the second satellite is
a. 8 R
b. 4R
c. 2R
d. R

B

Question. Two identical satellites are at R and 7R away from earth surface, the wrong statement is (R = Radius of earth)
a. Ratio of total energy will be 4
b. Ratio of kinetic energies will be 4
c. Ratio of potential energies will be 4
d. Ratio of total energy will be 4 but ratio of potential and kinetic energies will be 2

D

Question. A physical balance is used to measure the of an object.
a. weight
b. acceleration
c. mass
d. density

C

Question. According to one of the Kepler’s laws of planetary motion
a. r2 ∝ T3
b. r ∝ T2
c. r3 ∝ T2
d. r3 ∝ 1/T3

C

Question. Which is not a vector quantity?
a. mass
b. weight
c. force
d. acceleration

A

Question. Where will it be profitable to purchase one kilogram of apples?
a. At poles
b. At equator
c. At 45° latitudes
d. at 60° latitude

B

Question. If R is the radius of the earth, the height at which the weight of a body becomes ¼ its weight on the surface of the earth is
a. 2R
b. R
c. R/2
d. R/4

B

Question. When the masses of two objects are doubled, the force of gravitation between them becomes the original value.
a. 4 times
b. double
c. 5 times
d. 8 times

A

Question. When you put an object on a spring balance, you measure
a. mass.
b. force.
c. acceleration.
d. weight.

D

Question. Gravitational force is a
a. repulsive force.
b. attractive force.
c. neither a nor b.
d. both a and b.

B

Question. Which is a wrong statement about universal gravitational constant?
a. It has the same value at all places.
b. It is never zero.
c. It is vector quantity.
d. It value is 6.67 × 10–11 Nm2/kg2

C

Question. Which is wrong statement about acceleration due to gravity?
a. Its value is 9.8 m/s2
b. It is zero at the centre of the earth.
c. Its value changes from place to place.
d. It is a scalar quantity.

D

Question. The point where the pull of the earth exerting on a body is equal to the pull exerted by the moon is called
a. zero gravity.
b. null point.
c. gravitational constant.
d. escape point.

B

Question. When the distance between the two objects is doubled, the force of gravitation becomes of the initial value.
a. 4 times
b. ¼
c. double
d. ½

B

Question. Which law is it – “A planet revolves around the sun in an elliptical orbit”?
a. Newton’s first law
b. Newton’s second law
c. Kepler’s first law
d. Kepler’s second law

C

Question. The weight of a man on the moon if he weighs 54 N on the earth is
a. 5.4 N
b. 54 N
c. 9 N
d. 324 N

C

Question. When the distance between two objects is tripled, the force of gravitation becomes of its initial value.
a. 1/4th
b. 1/7th
c. 1/8th
d. 1/9th