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GRAVITATION 2

Total questions: 75

Worksheet time: 2hrs 53mins

Name
Class
Date
1.

The atmosphere is held to the earth by:

a)

Winds

b)

gravity

c)

clouds

d)

None of these

2.

Gravitational forces are:

a)

always attractive

b)

always repulsive

c)

sometimes attractive and sometimes repulsive

d)

None of these

3.

Which of the following is the evidence to show that there must be a force acting on earth and directed towards the sun:

a)

deviation of the falling bodies towards east

b)

revolution of earth around the sun

c)

phenomena of day and night

d)

apparent motion of sun round the earth

4.

The gravitational force between two objects does not depend on:

a)

Sum of the masses

b)

Product of the masses

c)

Gravitational constant

d)

(a)Distance between the masses

5.

The mass of the moon is about 1.2% of the mass of the earth. Compared to the gravitational force the earth exerts on the moon, the gravitational force the moon exerts on earth:

a)

Is the same

b)

Is smaller

c)

Is greater

d)

Varies with its phase

6.

A spherical planet far out in space has a mass M0 and diameter . D0 A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity which is equal to:

a)

GM0/ D02

b)

4GM0/ D02

c)

GM0/ 2D02

d)

4GM0/ 3D02

7.

The acceleration due to gravity at pole and equator can be related as:

a)

gp < ge

b)

gp = ge = g

c)

gp < ge = g

d)

gp > ge

8.

The weight of an object in the coal mine, sea level, at the top of the mountain are W1, W2

and W3

a)

W1 < W2 > W3

b)

W1 = W2 = W3

c)

W1 < W2 < W3

d)

W1 > W2 > W3

9.

At the surface of a certain planet, acceleration due to gravity is one-quarter of that on earth. If a brass ball is transported to this planet, then which one of the following statements is not correct:

a)

The mass of the brass ball on this planet is a quarter of its mass as measured on earth

b)

The weight of the brass ball on this planet is a quarter of the weight as measured on earth

c)

The brass ball has the same mass on the other planet as on earth

d)

The brass ball has the same volume on the other planet as on earth

10.

A spring balance is graduated on sea level. If a body is weighed with this balance at consecutively increasing heights from earth's surface, the weight indicated by the balance:

a)

Will go on increasing continuously

b)

Will go on decreasing continuously

c)

Will remain same

d)

Will first increase and then decrease

11.

According to Newton's law of gravitation, the Earth and the Moon are gravitationally attracted to each other. The more massive Earth attracts the Moon with...

a)

a stronger force than the Moon attracts the Earth.

b)

a weaker force than the Moon attracts the Earth.

c)

the same force as the Moon attracts the Earth.

d)

a force that is sometimes stronger and other times weaker than the Moon attracts the Earth.

12.

The picture shows three objects gravitationally interacting with each other. Which object exerts the greatest force on object B?

a)

Object A

b)

Object C

c)

A and C exert an equal force on B

d)

Cannot be determined

13.

The picture shows the gravitational field in the space surrounding the Earth. What is creating this gravitational field?

a)

The gravitational force.

b)

The mass of the Earth.

c)

The distance of the Earth.

d)

The universal gravitational constant.

14.

Kepler's Second Law states

a)

objects attract other objects with a force that is directly proportional to the product of their masses

b)

the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun

c)

An imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.

d)

Planets move about the Sun in an elliptical orbit with the Sun at one of the foci.

15.
Kepler's 2nd Law deals with 
a)
the shape of the planets' orbits
b)
the speed/area the planet travels 
c)
the length of time it takes the planet to orbit the sun
16.
Kepler's first law states that the orbits of the planets are oval in shape or 
a)
ellipses
b)
perfect circles
17.
The path a planet travels around the sun is called its 
a)
orbit
b)
ellipse
c)
barycenter
d)
precession
18.
What is inertia?
a)
amount of atoms
b)
amount of gravitational pull
c)
the size
d)
resistance to a change in motion
19.
In which location would you weight the least?
a)
Venus
b)
Earth
c)
Jupiter
d)
Moon
20.

which are the following is Newton’s Law of gravitation ?

a)

W=GMmrW=\frac{GMm}{r}

b)

F =GMmr2F\ =\frac{GMm}{r^2}

c)

V =GMrV\ =\sqrt{\frac{GM}{r}}

d)

g=− GMrg=-\ \frac{GM}{r}

21.

Newton said that any two masses will...

a)

combine into a larger mass.

b)

attract each other.

c)

create gravitational fields.

d)

push each other apart.

22.

A massive object and a less massive object exert a gravitational force on each other. Which of the following picture correctly shows the magnitude and direction of the forces involved in this interaction?

a)
b)
c)
d)
23.

A satelite is at a distance, rr  from the centre of Earth. by using Newton's Second Law of Gravitation, determine the speed,  vv  of the satelite motion

a)

v =GMfmv\ =\frac{GMf}{m}  

b)

v = GMmrv\ =\ \frac{GMm}{r}  

c)

v=2π r3GMv=2\pi\ \sqrt{\frac{r^3}{GM}}  

d)

v = GMrv\ =\ \sqrt{\frac{GM}{r}}  

24.
The amount of matter in an object
a)
mass
b)
weight
c)
inertia
d)
gravity
25.
The moon and other satellites rotate around the earth. Identify the force that keeps these satellites in orbit.
a)
gravity
b)
friction
c)
a strong force
d)
electromagnetic force
26.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
a)
mass and distance 
b)
mass and matter
c)
distance and weight 
d)
weight and mass
27.
Force of gravity is directly proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
28.
Force of gravity is inversely proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
29.
Two objects move toward each other gravitationally. As they get closer, the force between them:
a)
remains constant
b)
increases
c)
decreases
30.

The force that keeps the body in a circular path and is acting towards the center is called?

a)

Central force

b)

Frictional Force

c)

Centripetal Force

31.

The motion of the moon around the the earth is due to which force ?

a)

Gravitational force

b)

Frictional force

c)

Centripetal force

d)

Option 1 and 3

32.

Choose the correct definition of Universal law of gravitation

a)

Every object in the universe attracts every other object with a force which is proportional to the product of the distance between them and inversely proportional to their masses

b)

Every object in the Universe attracts every other object with a force which is inversely proportional to the square of the distance between them and proportional to the product of their masses

c)

Every object in the universe attracts every other object with a force which is proportional to their masses and inversely proportional to the square of distance between them

33.

What is G

a)

Gravitation

b)

Acceleration due to gravity

c)

Constant of Proportionality

34.

The value of G is :

a)

9.8m/s-2

b)

6.673 * 11-11

c)

6.683 * 10 -11

d)

6.673 * 10-11

35.

The SI unit of G is ?

a)

Nm1Kg1

b)

Mm2 Kg2

c)

Nm2kg2

36.

The universal Law of Gravitation explained

a)

the tides due to moon and the sun

b)

the force that binds us to the earth

c)

the motion of the planets around the sun

d)

All of the above

37.

The correct equation to show relation between G and g is :

a)

g=Mm/d2

b)

G=Mm/R2

c)

g=G Mm/d2

d)

g= Gm/R2

38.

Which off the following statement is correct about acceleration due to gravity

a)

Value of g varies from place to place

b)

g is more at equator than at pole

c)

g is equal at equator and pole

d)

g is less at the equator than at the pole

39.

Which among the following is a wrong differentiation between mass and weight ?

a)

Mass is amount of matter in a body whereas weight is the measure of force acting on body

b)

Si unit of mass is kg whereas SI unit of weight is newton

c)

mass has both magnitude and direction whereas weight has only direction

d)

mass can easily be measured by beam balance whereas weight can be measured by spring balance

40.

weight of an object is directly proportional to mass

a)

true

b)

false

41.

if mass is less gravitation will be

a)

more

b)

constant

c)

equal

d)

less

42.

weight of an object on moon = ?

a)

1/6 * its mass on earth

b)

1/6 * twice its weight on earth

c)

1/6 * its weight on earth

43.

What happen to the gravitational acceleration to an object if the object is moving from surface of the planets to the outer space?

a)

increases

b)

decreases

c)

unchanged

d)

increase, then decrease

44.

There is a car moves in a circle. Which of the following can explain the above situation?

a)

There is a force acts in opposite direction with car's weight.

b)

There is a force acts as centripetal force towards the centre of circle.

c)

There is a force acts in the direction of movement.

d)

There is a force acts away from the centre of circle.

45.
Where is the planet moving faster
a)
Position A to B
b)
Position B to C
c)
Position H to I
d)
Position I to J
46.

The energy stored in an object because of its position or state is called...... energy

a)

Potential

b)

Kinetic

47.

Higher the initial velocity the ........is the height reached by the ball.

a)

Smaller

b)

Higher

48.

Which of the following formulas is the correct equation for the law of Universal gravitation?

a)

F=GM1M2d2F=\frac{GM_1M_2}{d^2}

b)

F=mgF=mg

c)

F=Gd2m1m2F=\frac{Gd^2}{m_1m_2}

d)

F= F=KQ1Q2d2F=\frac{KQ_1Q_2}{d^2}

49.

If I double the mass of one object without changing anything else, What would happen to the gravitational force between that object and any other object?

a)

Doubles

b)

Quadruples

c)

Cut in Half

d)

14\frac{1}{4}  as much

50.

Which graph shows the relationship between gravitational force F between two point masses and their separation r?

a)

A

b)

B

c)

C

d)

D

51.

Figure 6 shows a tennis ball tied to a string is

swung at a constant speed in a horizontal circle.

Which statement is correct about the movement

of the ball in Figure 6?

a)

The ball is moving with constant velocity.

b)

The force acting on the ball changes

continuously.

c)

The period of revolution of the ball changes

continuously.

d)

The acceleration of the ball is directed

towards the centre of the circle.

52.

If Earth is a uniform sphere of radius R which of the following graphs shows the relationship between the force of gravity F acting on a body and the distance x from the centre of the Earth?

a)
b)
c)
d)
53.

The gravitational force between two bodies of masses m1 and m2 separated by distance r is F. State the effect on the gravitational force when both of m1and m2 increases twice.

a)

2F

b)

1/2 F

c)

4F

d)

1/4 F

54.

Two objects of different masses falling freely near the surface of the moon would

a)

(a) have same velocities at any instant

b)

(b) have different acceleration

c)

(c) experience forces of same magnitude

d)

(d) undergo a change in their inertia

55.

The weight of an object at the centre of the Earth of radius R is

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

56.

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)

(a) F1 is very much greater than F2

b)

(b) F2 is very much greater than F1

c)

(c) F1 is only a little greater than F2

d)

(d) F1 and F1 are equal

57.

The acceleration due to gravity on the Earth depends upon the

a)

(a) mass of the body

b)

(b) mass of the Earth

c)

(c) shape and size of the body

d)

(d) radius of the Earth

58.

The height of a geostationary Satellite from the surface of earth is

a)

36000 m

b)

36000 km

c)

3600 m

d)

3600 km

59.

In which case the escape velocity is maximum

a)

When angle of projection is 45°

b)

When it is projected vertically up

c)

When it is projected horizontally

d)

The escape velocity is independent of the angle of projection

60.

The mass of a body on the earth surface is 40 kg. Its mass at the centre of earth will be

a)

Zero

b)

Greater than 40 kg

c)

Infinite

d)

Unchanged

61.

Gravitational potential energy of a mass m on the surface of earth is

a)

-GMm/R

b)

-GMm/R²

c)

-GM/R²

d)

-GMm/R³

62.

The orbital period of a geostationary satellite is

a)

Slightly less than 24 hours

b)

Slightly more than 24 hours

c)

Equal to 24 hours

d)

Equal to 12 hours

63.

Relation between g and G is

a)

g=M/R²G

b)

g=MR²/G

c)

g=GR²/M

d)

g=GM/R²

64.

The satellite used to observe the entire surface of earth is

a)

Synchronous satellite

b)

Polar satellite

c)

Both the above

d)

None of the above

65.

The areal velocity of planetary motion is

a)

a constant

b)

not a constant

c)

varies with time

d)

none of these

66.

In a vaccum, all freely falling objects

a)

have the same velocity

b)

have the same acceleration

c)

have the same speed

d)

have the same force

67.

Jupiter is a much more massive planet than Earth. If you treavelled to Jupiter, your mass would

a)

remain the same

b)

decrease

c)

increase

68.

Which planet will take the most amount of time to revolve around the Sun?

a)

Mercury

b)

Venus

c)

Earth

d)

Mars

69.
An ellipse is drawn around two points called
a)
aphelion
b)
perihelion
c)
foci
d)
axis
70.

Why does acceleration (change in rate of velocity) happen when going in a circle even if you are going the same speed?

a)

The direction around the circle changes at every point.

b)

Velocity does not change

c)

Because direction is the same around the circle

d)

Neither

71.

What is h?

a)

is the altitude or height of the satellite from the surface of the planet

b)

radius of the planet

c)

radius of the satellite

d)

distance of the two objects from their center

72.

What causes tidal waves in the sea ?

a)

Gravitaton effect on the earth by the moon .

b)

Gravitational effect on the earth by the sun .

c)

The atmospheric impact on the earth .

d)

None of these

73.

Which of the following proves there is the gravitational force between the earth and the sun ?

a)

Occurrence of day and night

b)

Earth revolving around the Sun

c)

Sun apparently revolving around the Earth

d)

Falling bodies deviating towards the Earth

74.

Orbital velocity of a satellite is dependent on which factor when it is orbiing near the Earth surface ?

a)

Mass of the satellite

b)

Mass of the Earth

c)

Radius of the Eath

d)

Orbital radius

75.

Kepler's second law of constancy shows the conservation of which of the following ?

a)

Angular momentum

b)

Linear momentum

c)

Energy

d)

None of these

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