Physics 9 Unit 5 MCQs Tests

In this post, we have prepared 4 MCQs test of Federal Board Physics 9 Unit 5 MCQs Tests.

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Physics 9 Unit 5 MCQs Tests

Practice MCQs Test No 1

112

Class 9 Physics
Unit 5
Practice MCQs Test No 1

1 / 10

Distance of moon from Earth is?

3, 000, 000 km

30, 000 km

3, 80, 000 km

38, 000 km

2 / 10

The orbital speed of a low orbit satellite is:

8000 { ms }^{ -1 }

zero

800 { ms }^{ -1 }

8 { ms }^{ -1 }

3 / 10

Earth's gravitational force of attraction vanishes at:

42300 km

infinity

6400 km

1000 km

4 / 10

The value of g at a height one Earth's radius above the surface of Earth is:

1/4 g

1/3 g

2 g

1/2 g

5 / 10

Unit of gravitational field strength is:

J

N

N m

N { kg }^{ -1 }

6 / 10

_________ predicted about artificial satellites about 300 years ago.

Faraday

Newton

Einstein

Galileo

7 / 10

The value of g on moon's surface is 1.6 ms¯². What will be the weight of a 100 kg body on the surface of the moon?

1000 N

160 N

1600 N

100 N

8 / 10

Speed of GPS satellite is:

7.9 { kms }^{ -1 }

3.87 { kms }^{ -1 }

5.6 { kms }^{ -1 }

5.0 { kms }^{ -1 }

9 / 10

The altitude of geostationary orbits in which communications satellites are launched above the surface of Earth is:

6400 km

850 km

42300 km

1000 km

10 / 10

Value of g increases with the:

decrease in altitude

none of the above

Increase in mass of body

increase in altitude

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Practice MCQs Test No 2

77

Class 9 Physics
Unit 5
Practice MCQs Test No 2

1 / 10

The SI unit of gravitational force is:

both "a" and "b"

Newton

{ Nm }^{ 2 }{ kg }^{ -2 }

{ ms }^{ -2 }

2 / 10

If the distance between two masses is half then the force of gravitation becomes:

Four times

One fourth

Half

Doubled

3 / 10

What is not true about g?

g is greater at poles

g decrease as go higher

g is different at different places

g is less at poles

4 / 10

The force which pulls the object towards the center of circle is known as force:

Gravitational

Centripetal

Coulomb

Frictional

5 / 10

In System International, the value of G is:

6.67 x { 10 }^{ -11 }{ Nm }^{ 2 }{ kg }^{ -2 }

6.4 x { 10 }^{ -11 }{ Nm }^{ 2 }{ kg }^{ -2 }

6.4 x { 10 }^{ 6 }{ Nm }^{ 2 }{ kg }^{ -2 }

6.67 x { 10 }^{ 11 }{ Nm }^{ 2 }{ kg }^{ -2 }

6 / 10

When an object is at a height equal to radius of earth above the surface of the earth. What is the value of gh

2g

g/4

4g

g/2

7 / 10

What will be the value of G if mass of the earth becomes four times:

No change

Doubled

Four times

One fourth

8 / 10

Radius of earth is:

6.4 x { 10 }^{ 6 }m

6.4 x { 10 }^{ 6 } km

6 x { 10 }^{ 6 } km

6 x { 10 }^{ 6 } m

9 / 10

The mass of Earth is approximately:

6.0 x{ 10 }^{ -24 } kg

6.9 x { 10 }^{ 24 } kg

6.0 x { 10 }^{ 24 } kg

5500 x { 10 }^{ 24 } kg

10 / 10

As we go up the value of G becomes:

Unchanged

Increases

Decreases

Doubled

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Practice MCQs Test No 3

60

Class 9 Physics
Unit 5
Practice MCQs Test No 3

1 / 10

An artificial satellite keeps on revolving around the earth in different orbits with uniform speed due to the?

Frictional force

Gravitational force

Coulmb force

Electromagnetic force

2 / 10

On mountains our weight will be ____________ as compared to weight on the surface of earth.

Greater

Equal

Less

None of above

3 / 10

Gravitational force on the surface of earth is equal to:

g

W

All of above

G

4 / 10

Weight of the body of mass 10 kg on the surface of moon:

160 N

None of above

1.62N

16N

5 / 10

A satellite is revolving around the earth in a circular orbit. If the radius of the orbit is increased from R to 2R. What will be its velocity?

frac { v }{ sqrt { 2 } }

sqrt { 2 }v[/katex

v/2

{ v }^{ 2 }

6 / 10

If mass of both the bodies is 1 kg and distance between their centers is lin then the gravitational force will be equal to:

V

g

G

None of above

7 / 10

If the weight of an object on the surface of earth is W. Its weight on the surface of moon will be:

6W

W/4

W/8

W/6

8 / 10

If a rocket is fired vertically with a speed of it will start revolving around the earth:

11.2{ kms }^{ -1 }

8{ kms }^{ -1 }

8{ ms }^{ -1 }

9.8{ ms }^{ -1 }

9 / 10

Relative velocity of Geostationary satellite with respect to earth is:

7.9{ kms }^{ -1 }

11.2{ kms }^{ -1 }

Zero

9.8{ ms }^{ -1 }

10 / 10

Height of the Geostationary satellite above the surface of earth is:

1000 km

3600 km

42300 km

36000 km

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Challenge MCQs Test

125

---

Class 9 Physics
Unit 5
Full Chapter Challenge Test

1 / 30

The value of g at a height one Earth's radius above the surface of Earth is:

1/2 g

2 g

1/3 g

1/4 g

2 / 30

In System International, the value of G is:

6.4 x { 10 }^{ -11 }{ Nm }^{ 2 }{ kg }^{ -2 }

6.67 x { 10 }^{ -11 }{ Nm }^{ 2 }{ kg }^{ -2 }

6.67 x { 10 }^{ 11 }{ Nm }^{ 2 }{ kg }^{ -2 }

6.4 x { 10 }^{ 6 }{ Nm }^{ 2 }{ kg }^{ -2 }

3 / 30

Radius of earth is:

6.4 x { 10 }^{ 6 } km

6.4 x { 10 }^{ 6 }m

6 x { 10 }^{ 6 } m

6 x { 10 }^{ 6 } km

4 / 30

The altitude of geostationary orbits in which communications satellites are launched above the surface of Earth is:

6400 km

42300 km

1000 km

850 km

5 / 30

Relative velocity of Geostationary satellite with respect to earth is:

9.8{ ms }^{ -1 }

7.9{ kms }^{ -1 }

Zero

11.2{ kms }^{ -1 }

6 / 30

The value of g on moon's surface is 1.6 ms¯². What will be the weight of a 100 kg body on the surface of the moon?

1600 N

1000 N

100 N

160 N

7 / 30

A satellite is revolving around the earth in a circular orbit. If the radius of the orbit is increased from R to 2R. What will be its velocity?

frac { v }{ sqrt { 2 } }

sqrt { 2 }v[/katex

v/2

{ v }^{ 2 }

8 / 30

Earth's gravitational force of attraction vanishes at:

1000 km

6400 km

42300 km

infinity

9 / 30

What is not true about g?

g is greater at poles

g is different at different places

g is less at poles

g decrease as go higher

10 / 30

If the distance between two masses is half then the force of gravitation becomes:

Four times

One fourth

Half

Doubled

11 / 30

If a rocket is fired vertically with a speed of it will start revolving around the earth:

8{ kms }^{ -1 }

11.2{ kms }^{ -1 }

8{ ms }^{ -1 }

9.8{ ms }^{ -1 }

12 / 30

When an object is at a height equal to radius of earth above the surface of the earth. What is the value of gh

g/4

2g

g/2

4g

13 / 30

The mass of Earth is approximately:

6.9 x { 10 }^{ 24 } kg

5500 x { 10 }^{ 24 } kg

6.0 x { 10 }^{ 24 } kg

6.0 x{ 10 }^{ -24 } kg

14 / 30

Distance of moon from Earth is?

38, 000 km

3, 80, 000 km

30, 000 km

3, 000, 000 km

15 / 30

The SI unit of gravitational force is:

{ Nm }^{ 2 }{ kg }^{ -2 }

both "a" and "b"

{ ms }^{ -2 }

Newton

16 / 30

Speed of GPS satellite is:

7.9 { kms }^{ -1 }

5.6 { kms }^{ -1 }

5.0 { kms }^{ -1 }

3.87 { kms }^{ -1 }

17 / 30

Unit of gravitational field strength is:

N m

J

N { kg }^{ -1 }

N

18 / 30

_________ predicted about artificial satellites about 300 years ago.

Einstein

Galileo

Newton

Faraday

19 / 30

What will be the value of G if mass of the earth becomes four times:

No change

Four times

Doubled

One fourth

20 / 30

Weight of the body of mass 10 kg on the surface of moon:

1.62N

16N

160 N

None of above

21 / 30

An artificial satellite keeps on revolving around the earth in different orbits with uniform speed due to the?

Coulmb force

Frictional force

Gravitational force

Electromagnetic force

22 / 30

The force which pulls the object towards the center of circle is known as force:

Centripetal

Gravitational

Coulomb

Frictional

23 / 30

As we go up the value of G becomes:

Unchanged

Increases

Decreases

Doubled

24 / 30

If the weight of an object on the surface of earth is W. Its weight on the surface of moon will be:

6W

W/6

W/8

W/4

25 / 30

Height of the Geostationary satellite above the surface of earth is:

36000 km

42300 km

3600 km

1000 km

26 / 30

The orbital speed of a low orbit satellite is:

800 { ms }^{ -1 }

8 { ms }^{ -1 }

8000 { ms }^{ -1 }

zero

27 / 30

Gravitational force on the surface of earth is equal to:

W

G

g

All of above

28 / 30

If mass of both the bodies is 1 kg and distance between their centers is lin then the gravitational force will be equal to:

None of above

g

V

G

29 / 30

On mountains our weight will be ____________ as compared to weight on the surface of earth.

Less

Greater

Equal

None of above

30 / 30

Value of g increases with the:

decrease in altitude

Increase in mass of body

none of the above

increase in altitude

Your score is

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