# 10 science part 1 topic 1 gravitation MCQ

1.) Weight is given by

A ) ma

B ) mv2

C ) mg

D ) mv2r

Ans C ) mg

2) Potential energy increases with

A ) Height B ) Inertia C ) Velocity

D ) Momentum

Ans A ) Height

3) If mass of the object is 10 kg, its weight is

A ) 10 kg B ) 10 N C ) 9.8 N D ) 98 N

Ans D ) 98 N

4 ) If the distance is doubled, what happens to the gravitational force?

A ) Becomes half B ) Increases by 2 C ) Increases by 4 D ) Decreases by 4

Ans D ) Decreases by 4

5 ) Application of force leads to change in

A ) Gravity B ) Motion C ) Weight

D ) Temperature.

Ans B ) Motion

6) In a free fall, initial velocity is

A ) Highest

B ) Lowest

C ) 0

D ) Infinity

Ans C ) 0

7) How many focal points an elipse has?

A ) 0

B ) 1

C ) 2

D ) 4

Ans C ) 2

8 ) If object is freely falling at velocity 98 m/s, then time taken to reach ground will be

A ) 9.8s

B ) 98s

C ) 1s

D ) 10s

Ans D ) 10s

9 ) If T1 is time required for travelling distance R1 and T2 for R2, then using Kepler’s third law. What can be concluded?

A ) T1R1 = T2 R2

B )T1 2R13 =T12 R23

C ) T1 2 R2 = T2 2 R1

D ) T1 2 R 23 = T 2 2

Ans: D )   T1 2 R 23 = T 2 2

10 ) Force between any two objects of mass m1 and m2 placed at distance d is given by

A )F = G m1m2/d

B ) F = m1m2/ Gd1

C ) F = G m1m2/d2

D ) F = Gm1 2m 2 2 / d2

Ans: C )

12 ) S.I unit of g is

A ) m/s

B ) m/s2

C ) kgm/s2

D ) N

Ans B ) m/s2

13) Kepler’s first law explains

A ) Elliptical orbit of a planet

B ) Gravitational force between objects

C ) Area covered by a planet

D ) Time taken by planet for revolution

Ans A ) Elliptical orbit of a planet

14 ) Point where total mass of any object is assumed to be concentrated is

A ) Centre of mass

B ) Centroid

C ) Mass concentration

D ) Mass point of object

Ans A ) Centre of mass

15) Value of g increases as weight of object increases.

A ) True; g α mass of the object False; g α 1

B )mass of object

C ) False; g depends on weight

D ) False ; g does not depend on mass.

Ans D ) False ; g does not depend on mass.

16 ) Velocity of any object in circular motion is in direction.

A ) Tangential  B ) Radial C ) Parallel D ) Vertical

Ans A ) Tangential

17 ) Gravitational acceleration is denoted by

A ) G

B ) g

C ) Ag

D ) ga

Ans B ) g

18 ) Kepler’s laws do not explain

A ) Elliptical orbit

B ) Area covered by planet

C ) Gravitational force

D ) Time taken by planet

Ans C ) Gravitational force

19. ) The energy stored in object due to its position or state is

A ) Kinetic energy

B ) Gravitational energy

C ) Potential energy

D ) Electrical energy

Ans C ) Potential energy

20 ) As we go inside the earth, r decreases. The value of g

A ) Increases

B ) Decreases

C ) Remains same

D ) Becomes 0

Ans B ) Decreases

21 ) If M = 3M and R = 3R, then g

A ) Increases by 3 B ) Decreases by 9 C ) Increases by 1/3

D ) Decreases by 3

Ans D ) Decreases by 3

22 ) The line joining the planet and the Sun sweep equal areas in equal time. This is ……………

A ) Newton’s first law

B ) Kepler’s first law

C ) Newton’s second law

D ) Kepler’s second law Ans D ) Kepler’s second law

22 ) Pick out an odd option

A ) Mass

B ) Weight

D ) Gravitational acceleration

Ans A ) Mass

23 ) Value of g increases with altitude increase.

A ) True, it depends on the distance directly.

B ) True, it depends on the mass directly.

C ) False, it depends on the distance directly.

D ) False, it depends on the distance inversely.

Ans D ) False, it depends on the distance inversely.

24 ) If height is doubled and mass is halved, the potential energy

A ) Increases

B ) Decreases

C ) Remains same

D ) Becomes 1/2

Ans C ) Remains same

25 ) Objects are pulled downwards towards earth due to phenemenon of …………….

A ) Magnetation

B ) Gravitation

C ) Centre of Mass

D ) Revolution and Rotation

Ans B ) Gravitation

26 ) SI unit of G is

A ) Nm2 kg-2 B ) Nm kg-1 C ) N2m2 kg2 D ) N m/s2

Ans A ) Nm2 kg-2

27 ) If F is centripetal force and m is the mass of any planet then A ) F α 1/m    B ) F α m2     C ) F α m    D ) F α m3

Ans C ) F α m

28 ) If velocity is equal to time taken (T), then Radius (R) will be equal to

A ) T2/

B ) 2T/ T2

C ) T/ απ

D ) 2πT/ √T

Ans: A ) T2/ 2π

29 ) Average value of g is

A ) 9.8 N

B ) 9.8 m/s C ) 0.98 m/s2 D ) 9.8 m/s2

Ans D ) 9.8 m/s2

30 ) The height at which a ball is thrown increases as

A ) Acceleration increases                         B ) Initial velocity increases C ) Final velocity increases                        D ) Uniformity increases

Ans B ) Initial velocity increases

31 ) Lowest value of g: equator : : Highest value of g : ?

A ) Tropical region

B ) Polar region

C ) Temperate zone

D ) Elevated regions

Ans B ) Polar region

32 ) Kepler stated the laws describing ……………

A ) Circular motion B ) Planetary motion C ) Uniform motion D ) Solar motion

Ans B ) Planetary motion

33 ) In circular motion, object experiences centripetal force.

A ) False, it is experienced in uniform motion

B ) False, in circulare motion only gravity acts

C ) True, it is radially acting towards centre

D ) True, centripetal force is tangential

Ans C ) True, it is radially acting towards centre

34 ) Pick odd option out:

A ) Gravitational Force

B ) Centripetal Force

C ) Gravitational constant

D ) Weight of the object

Ans C ) Gravitational constant

35 ) Pick out an odd option:

A ) Grams

B ) Newton

C ) Centimetres

D ) Dyne

Ans B ) Newton

36 ) Force is equal to G when unit masses are placed at unit distance.

A ) False (distance must not be unit)

B )True (F = G d/m1m2 )

C )  False (F = Gm1m2/d2 )

Ans

False (F = Gm1m2 )

C ) True (F = Gm1m2/d2 )

D ) True (F = G m1m2 / d2 )

Ans : D )

37 ) of am object is constant all along the universe.

A ) Mass B ) Weight C ) Gravity   D ) Momentum

Ans A ) Mass

38 ) CGS unit of G is

A ) dyne cm2 g-2

B ) dyne m g-1

C ) dyne2 cm2 g2

D ) N cm2 g 2

Ans A ) dyne cm2 g-2

39 ) Which of the following is a vector quantity?

A ) Speed

B ) Time

C ) Distance

D ) Velocity

Ans D ) Velocity

40 ) If R is the radius of the orbit, distance travelled in one revolution will be

A ) πR2

B ) 2πR

C ) 2πR2

D ) 2π / R

Ans B ) 2πR

41) Light is a type of

A ) Electromagnetic wave

C ) Visible wave

D ) Gravitational wave

Ans A ) Electromagnetic wave

42 ) With uniform density, centre of mass is at

A ) Edge B ) Corner C ) Vertice

D ) Centroid

Ans D ) Centroid

43 ) is necessary to change the speed as well as the direction of the motion of an object.

A ) Velocity B ) Inertia C ) Force D ) Gravity

Ans C ) Force

44 ) The third kinematical equation during free fall becomes

A ) v = u + gt

B ) v = gt

C ) s = 1/2 g t 2

D ) v2 = 2gs

Ans D ) v2 = 2gs

45 ) g is formulated as

A ) g = GM/R2

B ) g = GM2 / R3

M2

Ans

C ) g = M2 / GR3

D ) g = GM/R

g = GM

Ans: A )

46 ) The SI unit of potential energy is

A ) N    B ) Kg m/s2      C ) Joules       D ) Kg m2s2

Ans C ) Joules

47 ) Force acting on a body results in

A ) Inertia

B ) Acceleration

C ) Increase in temperature

D ) Increase in volume

Ans B ) Acceleration

48) If the mass of each object is doubled, the force between the two objects.

A ) Becomes half B ) Increases by 2 C ) Increases by 4 D ) Decreases by 4

Ans C ) Increases by 4

49 ) At infinite distance from earth, the total energy equals to

A ) Kinetic energy

B ) Potential energy

C ) Gravitational energy

D )  O

Ans D ) O

50 ) Initial velocity during free fall : 0 m/s : : Acceleration during free fall : ?

A ) 0 m/s2 B ) 9.8 m/s2 C ) 9.8 m/s    D ) – 9.8 m/s2

Ans B ) 9.8 m/s2

51 ) Escape velocity is velociy

A ) Required to escape gravitational boundaries

B ) Required to escape the potential energy

C ) Required to escape kinetic energy

D ) Required to escape out of any motion

Ans A ) Required to escape gravitational boundaries

52) AB is the distance travelled in eight months by a planet and S is the position of Sun. Again it travels EF in next eight months. What can be concluded by this using Kepler’s law.

A ) AB = EF

B ) AB ≥EF

C ) Area ASB = Area ESF

D ) Area ASB ≥Area ESF

Ans C ) Area ASB = Area ESF

53 ) Free fall is only possible in

A ) Air

B ) Vacuum C ) Water D ) Oil

Ans B ) Vacuum

54 ) Third law of planetary motion is given as

A ) T2 α r3

B ) T2 = r3

C ) Equal areas

D ) T = r

Ans A ) T2 α r3

55 ) Sum of kinetic and potential energies is

A ) Minimal energy

B ) Total energy

C ) Gained energy

D ) Collective energy

Ans B ) Total energy

56 ) Force : dynes : : velocity (CGS units)

A ) m/s B ) cm/s C ) m/s2 D ) cm/s2

Ans B ) cm/s

57 ) ‘Centripetal’ means –

A ) Circular

B ) Centre seeking

C ) Centre philic

D ) Centre phobic

Ans B ) Centre seeking

58) Object in free fall has negative acceleration.

A ) True, it is vertically downwards along gravity B ) True, it is vertically upwards against gravity C ) False, it is vertically downwards along gravity D ) False, it is vertically upwards against gravity

Ans C ) False, it is vertically downwards along gravity

59) Gravitation was invented by ……………

A ) Kepler B ) Newton C ) Galileo D ) Einstein

Ans B ) Newton

60) Object stable in position : Potential energy : : object in motion : ?

A ) Gravitational energy

B ) Total energy

C ) Kinematical energy

D ) Kinetic energy

Ans D ) Kinetic energy

61) Find the unsuitable option out.

A ) Speed B ) Mass C ) Weight

D ) Distance

Ans C ) Weight

62) If the objects are of irregular shape, then the direction of Force is

A ) Along the line joining their centre of masses

B ) Along the edges of the objects.

C ) Along the line joining their centres

D ) Along the line joining their bases

Ans A ) Along the line joining their centre of masses

63 ) Pick the odd option out:

A ) Speed

B ) Velocity

C ) Displacement

D ) Acceleration

Ans A ) Speed

64) According to which theory, every object in universe attracts each other?

A ) Planetary motion law

B ) Kepler’s theory

C ) Law of Gravitational energy

D ) Theory of universal gravity

Ans D ) Theory of universal gravity

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