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Semester II: Module 2 : Law of Gravitation & Satellites

Total questions: 95

Worksheet time: 2hrs 55mins

Name
Class
Date
1.
Force of gravity is inversely proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
2.
If Earth's mass was cut in half, what would happen to your mass?
a)
increase because gravitational force increases
b)
decrease because gravitational force decreases
c)
decrease because gravitational force increases
d)
nothing, mass is not affected by gravitational force
3.

Calculate the gravitational force between two objects when they are 0.750m apart. Each object has a mass of 5.00kg.

a)

2.96x10-7N

b)

3.00x10-6N

c)

2.22x10-9N

d)

2.23x10-8N

4.
Two objects are attracted to each other with 36 N of gravitational force.
What would the force between them be if the distance between them were doubled?
a)
9
b)
18
c)
72
d)
144
5.
What is the Universal law of gravitation equation? 
a)
G=F ⋅ m⋅m2/r2
b)
F=G ⋅ m⋅m2/(r)2
c)
F=G ⋅ r2/m⋅m2
d)
G=F ⋅ r2/m⋅m2
6.
The law of universal gravitation is credited to whom?
a)
Einstein
b)
Galileo
c)
Darwin
d)
Newton
7.
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
8.

What is the gravitational force between two identical 50,000 kg asteroids whose centers of mass are separated by 1000 m?

a)

2500 N

b)

3.3 x 10-12 N

c)

1.67 x 10-4 N

d)

1.67 x 10-7 N

9.

Two spherical objects have masses of 8000 kg and 1500 kg. Their centers are separated by a distance of 1.5 m. Find the gravitational attraction between them

a)

5.4 X 10-4 N

b)

1.2 X 107 N

c)

3.6 X 10-4 N

d)

5.33 N

10.
Complete the following statement: The farther away two planets are the _______ the gravitational force between them.
a)
more
b)
same
c)
dosen't matter
d)
less
11.
Gravity is the force objects put on each other because of their ______.
a)
Mass
b)
Friendliness
c)
Acceleration
d)
Speed
12.

Which configuration will result in the greatest gravitational force?

a)

small masses far apart

b)

large masses far apart

c)

small masses close together

d)

large masses close together

13.

What is the relation between the escape velocity and orbital velocity of a satellite, if the satellite is close to the earth’s surface?

a)

Vo = 2√Ve

b)

Ve = √2 Vo

c)

Ve = 2√Vo

d)

Vo = √2Vo

14.

Consider a body of mass m which needs to be moved from an orbit of radius 2R to 3R. What is the energy required?

a)

GmM/(12R)

b)

GmM/(6R)

c)

GmM/R

d)

GmM/2R

15.

Choose the factor on which the orbital velocity does not depend when the satellite is orbiting close to the earth’s surface:

a)

The mass of the earth

b)

The mass of the satellite

c)

The orbital radius

d)

The radius of the earth

16.

If a satellite takes time T for revolution, the  kinetic energy is proportional to:                            

a)

     1/T

b)

 T23​T^{\frac{2}{3}}​  

c)

 T−3T^{-3}  

d)

 T−2T^{-2}  

17.

A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will:

a)

Continue to move with velocity v along the original orbit

b)

Move with a velocity v, tangentially to the original orbit

c)

Fall down with increasing velocity

d)

Ultimately come to rest somewhere on the original orbit

18.

The period of geostationary artificial satellite of earth is:

a)

6 hours

b)

24 hours

c)

12 hours

d)

365 days

19.

A satellite is revolving around the sun in a circular orbit with uniform velocity v. If the gravitational force suddenly disappears, the velocity of the satellite will be:

a)

Zero

b)

V

c)

2 V

d)

Infinity

20.

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of earth:

a)

The acceleration of S is always directed towards the centre of the earth

b)

The angular momentum of S about the centre of the earth changes in direction, but its magnitude remains constant

c)

The total mechanical energy of S varies periodically with time

d)

The linear momentum of S remains constant in magnitude

21.

An astronaut orbiting the earth in a circular orbit 120 km above the surface of earth gently drops a spoon out of space-ship. The spoon will:

a)

Fall vertically down to the earth

b)

Move towards the moon

c)

Will move along with space-ship

d)

Will move in an irregular way then fall down to earth 10. The period of a satellite in a circular orbit around a planet

22.

The period of a satellite in a circular orbit around a planet is independent of:

a)

The radius of the planet

b)

The mass of the planet

c)

The mass of the satellite

d)

All of these

23.

A satellite revolves around the earth in an elliptical orbit. Its speed:

a)

Is the same at all points in the orbit

b)

Is greatest when it is closest to the earth

c)

Is greatest when it is farthest from the earth

d)

Goes on increasing or decreasing continuously depending upon the mass of the satellite

24.

Out of the following, the only incorrect statement about satellites is:

a)

A satellite cannot move in a stable orbit in a plane passing through the earth's centre

b)

Geostationary satellites are launched in the equatorial plane

c)

We can use just one geostationary satellite for global communication around the globe

d)

The speed of a satellite increases with an increase in the radius of its orbit

25.
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
26.
Force of gravity is directly proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
27.
Force of gravity is inversely proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
28.
Two asteroids exert a gravitational force, F, on each other. Some time later, the asteroids are now three times as far from each other as before. Which of the following represents the gravitational force at this distance? 
a)
F/3
b)
F/2
c)
F/6
d)
F/9
29.

The sun is the anchor point of our solar system because of

a)

the gas Hydrogen

b)

its small density

c)

its huge mass

d)

its location

30.
A moon is located at  1 unit out from the planet it orbits. If that moon was orbiting at 2 units out from the planet, how much would the gravitational force on the moon be compared to its distance at 1 unit?
a)
1/4
b)
1/6
c)
2x as much
d)
4 times as much
31.
Ocean tides occur mainly because 
a)
water normally runs to the side of Earth away from the sun
b)
of the gravitational pull of the sun on Earth
c)
of different gravitational pulls of the moon on opposite sides of Earth
d)
as Earth rotates it leaves the ocean water somewhat behind it
32.
Bruno the bat flies at a speed of 0.5 m/s in circle of radius 1 m. What is his acceleration?
a)
0.25 ms-2
b)
0.5 ms-2
c)
1 ms-2
d)
2 ms-2
33.
How are mass and weight different?
a)
Mass is the amount of matter in an object;Weight is the amount of gravitational force acting on the object
b)
Mass is the amount of gravitational force acting on an object;Weight is the amount of matter in an object
c)
Mass is a thing;Weight is a place
d)
Mass is an animal;weight is a human
34.
The force of gravity on Jupiter is a little more than 2 times the gravitational force on Earth. If an object has a mass of 50 kg and a weight of 490 N on Earth, what would be the object's approximate mass and weight on Jupiter?
a)
50 kg and 490 N
b)
100 kg and 490 N
c)
50 kg and 980 N
d)
100 kg and 980 N
35.
A planet moves fastest during its orbit around the Sun at the when 
a)
it is closest to the sun and gravity has a stronger pull
b)
it is farthest from the sun and gravity has a stronger pull
c)
it is closest to the sun and gravity has a weak pull
d)
it is farthest from the sun and gravity has a weak pull
36.
Why don't satellites get closer to the Earth even though the Earth pulls on them?
a)
The pull from the sun cancels their movement
b)
The pull from the moon cancels their movement
c)
They are out of Earth's gravitational field
d)
They fall at the same rate that the Earth curves away from them
37.
A person on the Earth weighs 180 pounds. How much will they weigh on the moon? ( Note: The moons "g" is1/6 that of Earth)
a)
30 lbs
b)
360 lbs
c)
0- you are weightless in space
d)
18 lbs
38.
What is weight?
a)
The amount of particles in an object
b)
The force applied by gravity on a mass
c)
How much you weigh on Earth
d)
The number of Newton's of force your body applies to the ground. 
39.
If a feather and a hammer are dropped at the same time on the moon, where there is no atmosphere, which one will hit the ground first?
a)
Neither, there is no gravity on the moon.
b)
hammer because it has more mass
c)
feather because it has less mass
d)
both will hit at the same time
40.
Two objects are attracted to each other by a gravitational force F. if the distance between the objects is doubled, what is the strength of the new force in terms of F? 
a)
2F
b)
9 F
c)
1/2 F
d)
1/4 F
41.
Which one of the following statements concerning the two “gravitational constants” G, the universal constant,  and g the magnitude of the acceleration due to the gravity is true?
a)
The value of G and g depend on location
b)
The value of g is the same everywhere, but the value of G is not. 
c)
The value for G is the same everywhere, but the value of g is not. 
d)
The value of G and g are equal. 
42.
The gravitational force is: 
a)
A mutual force created by tension
b)
A mutual force that exists due to the charge of an object.
c)
A mutual force that exists due to the mass of an object. 
d)
A normal force. 
43.
What type of interaction is a gravitational force? 
a)
Attractive
b)
Repulsive
c)
Attractive and repulsive
d)
No interaction exists. 
44.
What are the standard units for the strength of the gravitational interaction? 
a)
N
b)
s
c)
m/s/s
d)
J
45.
In the earth-moon system the moon orbits the earth. What is the "centripetal" force causing the moon to stay in orbit around the earth? 
a)
Tension
b)
Friction
c)
Normal 
d)
Gravity 
46.
The discovery of the "Universal Gravitation" is associated with: 
a)
Robert Hook
b)
Albert Einstein
c)
Isaac Newton
d)
James Joule
47.
An apple is hangs on a tree on the earth, Which of the following statements is correct about the interaction between the apple and the earth? 
a)
The force on the apple is greater that the force on the Earth.
b)
The force on the apple is equal to the force on the earth
c)
The force on the Earth is larger than the force on the apple.
d)
The forces on the apple and the earth are zero because they are not touching each other. 
48.
Two objects are attracted to one another by a strength of force F. If one mass doubles and the other is tripled, what is the new gravitational force between the objects in terms
 of F? 
a)
4F
b)
6F
c)
1/9 F
d)
1/6 F
49.

The force of gravity on you is greatest when you are standing _____.

a)

far above Earth's surface

b)

just above Earth's surface

c)

on Earth's surface

d)

below Earth’s surface

50.

The gravitational field is directed

a)

towards the earth

b)

away from earth

c)

with no direction

d)

in a specific direction making angle with earth

51.

The Earth attracts a body with a force equal to its_____________.

a)

weight

b)

area

c)

volume

d)

pollution

52.

Energy object possesses due to its position is called _______.

a)

kinetic energy

b)

mechanical energy

c)

potential energy

d)

chemical energy

53.

The force due to which everybody of the universe attracts every other body is ________.

a)

force of gravitation

b)

force of limiting friction

c)

force of inertia

d)

force of mechanics

54.

In the mathematical form of Newton’s law of universal gravitation, the symbol G stands for ________________.

a)

gravity

b)

the acceleration of gravity

c)

the gravitational constant

d)

the gravitational potential energy

55.

According to Newton’s law of universal gravitation, the force of gravitational attraction between a planet and an object located upon the planet’s surface depends upon ______________.

a)

the radius of the planet

b)

the mass of the object

c)

the mass of the planet

d)

All of the above

56.

What are the types of satellites?

a)

artificial & homemade

b)

natural & organic

c)

natural & artificial

57.

What do natural and artificial satellites have in common?

a)

the don't have anything in common

b)

they orbit celestial bodies

c)

they send information to the Earth

d)

the float outer space with no direction

58.
The first artificial satellite, Sputnik I, orbited...
a)
the moon.
b)
for 57 days.
c)
with a dog aboard.
d)
the atmosphere.
59.
Laika, the first living being in space, was a...
a)
dog.
b)
cat.
c)
canary.
d)
rabbit.
60.
In 1958, the United States launched its first satellite, 
a)
Laika I.
b)
Columbus I.
c)
Sputnik I.
d)
Explorer I.
61.
By 1964, communications satellite networks sent messages around the...
a)
solar system.
b)
orbit.
c)
world.
d)
country.
62.
Early satellites were placed in an orbit a few hundred kilometers above the Earth's surface called a(n)...
a)
geostationary orbit (GEO).
b)
low stationary orbit (LSO).
c)
high Earth orbit (HEO).
d)
low Earth orbit (LEO).
63.
A satellite that travels in an orbit that exactly matches the Earth's rotation is traveling in a(n)
a)
low Earth orbit (LEO).
b)
low stationary orbit (LSO).
c)
geostationary orbit (GEO).
d)
high Earth orbit (HEO).
64.
People can find out their exact location on Earth by using a...
a)
Global Drection System (GDS) receiver.
b)
Regional Positioning System (RPS) receiver.
c)
Global Positioning System (GPS) receiver.
65.

What is the moon?

a)

The only natural satellite of the Earth

b)

It reflects the sun's light

c)

It rotates around the Earth

d)

All of the Above

66.

How far is the moon away from the Earth?

a)

3,86,000

b)

3,74,000

c)

3,84,000

d)

4,84,000

67.

How long is the LUNAR CYCLE mainly?

a)

14

b)

28

c)

29

d)

12

68.

What is the full form of VSSC ?

a)

Vikram Sarabhai Space Center

b)

Vishnu Sarabhai Space Center

c)

Vikram Sarabhai Science Center

d)

Venkataraman Sarabhai Space Center

69.

What is the full form of NASA?

a)

National Aeronautics and Space Administration

b)

National Airplane and Space Administration

c)

National Aeronautics and Science Administration

d)

National Aeronautics Space Administration

70.

What is communication satellites?

a)

They help us forecast weather

b)

They help us giving radio/T.V. signals

c)

They help in giving is the position of a vehicle or a vessel.

d)

None of the Above

71.

Who is the father of the Indian Space Programme?

a)

Dr. APJ Abdul Kalam

b)

Vikram Sarabhai

c)

Meghnad Saha

d)

Bhaskara-1

72.

What is India's first lunar probe?

a)

EduSat-1

b)

Rohini-1

c)

Manglayaan-1

d)

Chandrayaan-1

73.

What is the full form of GPS?

a)

Global Positioning Service

b)

Global Positioning System

c)

Geothermal Positioning System

d)

Global Posting System

74.

The path that an object follows around another object is called ___________.

a)

A circle

b)

A progression

c)

An orbit

d)

A force

75.

Human made objects that orbit the Earth are called ___________.

a)

Artificial asteroids

b)

Artificial satellites

c)

Natural asteroids

d)

Natural satellites

76.

The orbit of a satellite is determined by a balance between ___________.

a)

It's velocity and it's mass

b)

It's mass and it's function

c)

It's mass and the gravitational pull

d)

It's velocity and the gravitational pull

77.

The velocity a rocket must reach to escape from a planet or moons gravitational pull

a)

Vacuum

b)

Satellite

c)

Escape velocity

d)

Geosynchronous orbit

78.
Which of the following is needed to calculate escape speed for a rocket from earth?
a)
mass of fuel used in the rocket
b)
mass of the rocket
c)
mass of Earth
d)
all of the above
79.

The velocity a rocket must achieve to establish an orbit around another object in space

a)

Orbit Velocity

b)

Velocity

c)

Space shuttle

d)

probe

80.

Calculate the linear speed of a satellite in an orbit 900 km above Earth’s surface. Given G = 6.67 x 10^-11 N m^2 kg^-2, radius of earth is 6370 km and mass of the earth is 5.97 x 10^24 kg.

a)

1.05 x 10^4 m s^-1

b)

2.97 x 10^4 m s^-1

c)

9.40 x 10^5 m s^-1

d)

7.40 x 10^3 m s^-1

81.

Calculate the escape velocity of a satellite in an orbit 300 km above Earth’s surface. Given G = 6.67 x 10^-11 N m^2 kg^-2, radius of earth is 6370 km and mass of the earth is 5.97 x 10^24 kg.

a)

7.73 km s^-1

b)

10.9 km s^-1

c)

36.4 km s^-1

d)

244 km s^-1

82.

Satellites X and Y orbit the Earth at distances R and 4R respectively, as shown in the diagram.


Which statement is incorrect?

a)

The speed of Y is greater than the speed of X

b)

The time period of Y is greater than the time period of X

c)

The potential energy of Y is greater than the potential energy of X.

d)

The gravitational force acting on Y is less than the gravitational force acting on X.

83.

The Earth moves around the Sun in a circular orbit with a radius of 1.5 × 108 km. What is the Earth’s approximate speed?

a)

1.5 × 103ms–1

b)

5.0 × 103ms–1

c)

1.0 × 104ms–1

d)

3.0 × 104ms–1

84.

A satellite is in orbit at a height h above the surface of a planet of mass M and radius R.

What is the velocity of the satellite?

a)
b)
c)
d)
85.

A satellite of mass m travels in a circular orbit of radius r around a planet of mass M. Which one of the following expressions gives the angular speed of the satellite?

a)
b)
c)
d)
86.

An artificial satellite of mass m is in a stable circular orbit of radius r around a planet of mass M. Which one of the following expressions gives the speed of the satellite? G is the universal gravitational constant.

a)
b)
c)
d)
87.

A planet of mass M and radius R rotates so rapidly that loose material at the equator only just remains on the surface. What is the period of rotation of the planet?

G is the universal gravitational constant.

a)
b)
c)
d)
88.

A satellite is in orbit at a height h above the surface of a planet of mass M and radius R. What is the velocity of the satellite?

a)
b)
c)
d)
89.

Energy stored because of gravity is called:

a)

Gravitational Potential Energy

b)

Kinetic Energy

c)

Mechanical Advantage

d)

Chemical Energy

90.

How could you increase the gravitational potential energy of an object without changing its mass and gravity?

a)

Make the object larger

b)

Lower the object towards the ground

c)

Raise the object farther off the ground

d)

Allow the object to roll on the ground

91.

Gravitational potential energy depends on the strength of gravity, ________ and ________ of the object.

a)

height and mass

b)

friction and movement

c)

mass and movement

d)

height and friction

92.

Which of the following is the correct equation for calculating an object's gravitational potential energy?

a)

PE = mgh

b)

PE = mg / h

c)

PE = mg + h

d)

PE = gh

93.

What is the value of the Earth's acceleration due to gravity (g)?

a)

9.8 m/s2

b)

100 m/s2

c)

25 m/s2

d)

3.14 m/s2

94.

What is the gravitational potential energy of a 26 kg eagle, flying at an altitude of 65 m at a speed of 19 m/s?

Let g = 9.8N/kg

a)

32,110 J

b)

1690 J

c)

172.4 J

d)

16,562 J

95.
A satellite which takes 24 hours for 1 complete orbit is called a
a)
polar satellite
b)
geostationary satellite

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