Class 9 - Practice Level 2 – Gravitation set - 2

Total questions: 25

Calculate the gravitational force between two 20 kg masses separated by a distance of 3 meters. $ \displaystyle (Use G=6.67\times {{10}^{{-11}}}N{{m}^{2}}/k{{g}^{2}})$

Topic: Gravitational Force Between Masses

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:2.97\times {{10}^{{-9}}}N$

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:8.89\times {{10}^{{-10}}}N$

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:1.48\times {{10}^{{-10}}}N$

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:2.97\times {{10}^{{-10}}}N$

None

If a person weighs 800 N on Earth, what would be their weight on Venus where the acceleration due to gravity is $ \displaystyle 8.87m/{{s}^{2}}$

Topic: Weight on Other Planets

Weight: 724 N

Weight: 762 N

Weight: 774 N

Weight: 816 N

None

Calculate the gravitational potential energy of a 5 kg mass at a height of 10 meters above the ground$ \displaystyle {(\text{Use }g=9.8m/{{s}^{2}})}$

Topic: Gravitational Potential Energy

Potential energy: 490 J

Potential energy: 980 J

Potential energy: 1470 J

Potential energy: 1960 J

None

An object is dropped from a height of 45 meters. Assuming no air resistance, what will be its velocity just before it hits the ground? $ \displaystyle {(\text{Use }g=9.8m/{{s}^{2}})}$

Topic: Free Fall Velocity

Velocity: 20.1 m/s

Velocity: 25.3 m/s

Velocity: 29.7 m/s

Velocity: 30.0 m/s

None

If the distance between two masses is quadrupled, how does the gravitational force between them change?

Topic: Gravitational Force and Distance

It becomes one-sixteenth

It becomes one-fourth

It becomes four times

It becomes sixteen times

None

How does the value of g change as you move from the equator to the poles?

Topic: Acceleration Due to Gravity Variation

It increases

It decreases

It remains constant

It first increases then decreases

None

Calculate the escape velocity from the surface of Mars where the radius of Mars is $ \displaystyle \text{3}\text{.39}\times \text{1}{{\text{0}}^{6}}\text{ and }g=3.71m/s$

Topic: Escape Velocity Calculation

Escape velocity: 5.0 km/s

Escape velocity: 7.0 km/s

Escape velocity: 9.0 km/s

Escape velocity: 11.0 km/s

None

Calculate the orbital speed of a satellite orbiting the Earth at an altitude of 400 km. $ \displaystyle \left( {\text{Radius of Earth R}=6400km,g=9.8m/{{s}^{2}}} \right)$

Topic: Orbital Speed Calculation

Orbital speed: 7.5 km/s

Orbital speed: 7.8 km/s

Orbital speed: 8.1 km/s

Orbital speed: 8.4 km/s

None

If an object is raised to a height twice its original height, how does its gravitational potential energy change?

Topic: Gravitational Potential Energy

It remains the same

It doubles

It triples

It quadruples

None

10.

How does the mass of an object affect its weight?

Topic: Mass and Weight Relationship

Weight is independent of mass

Weight is directly proportional to mass

Weight is inversely proportional to mass

Weight is equal to mass

None

11.

What is the gravitational field strength at a point 1000 km above the Earth's surface? $ \displaystyle \left( {\text{Radius of Earth R}=6400km,g=9.8m/{{s}^{2}}} \right)$

Topic: Gravitational Field Strength

Field strength: 7.3 N/kg

Field strength: 8.2 N/kg

Field strength: 8.6 N/kg

Field strength: 9.0 N/kg

None

12.

How does the gravitational force change if the masses of both objects are doubled while the distance between them remains the same?

Topic: Gravitational Force and Masses

It remains the same

It doubles

It quadruples

It halves

None

13.

Calculate the orbital period of a satellite orbiting at a distance of 7000 km from the center of the Earth. $ \displaystyle {(\text{Use }g=9.8m/{{s}^{2}})}$

Topic: Orbital Period

Orbital period: 5000 s

Orbital period: 6000 s

Orbital period: 7000 s

Orbital period: 8000 s

None

14.

Where is the centre of gravity of a uniform, symmetrical object located?

Topic: Centre of Gravity

At its base

At its top

At its geometric center

At its edge

None

15.

A 3 kg object is lifted to a height of 4 meters. Calculate its gravitational potential energy. $ \displaystyle {(\text{Use }g=9.8m/{{s}^{2}})}$

Topic: Gravitational Potential Energy

Potential energy: 58.8 J

Potential energy: 78.4 J

Potential energy: 98.0 J

Potential energy: 117.6 J

None

16.

Calculate the gravitational force between two 10 kg masses separated by a distance of 5 meters$ \displaystyle (UseG=6.67\times {{10}^{{-11}}}N{{m}^{2}}/k{{g}^{2}})$$ \displaystyle (UseG=6.67\times {{10}^{{-11}}}N{{m}^{2}}/k{{g}^{2}})$

Topic: Gravitational Force Calculation

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:2.67\times {{10}^{{-11}}}N$

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:2.67\times {{10}^{{-10}}}N$

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:1.33\times {{10}^{{-11}}}N$

$ \displaystyle \mathbf{Gravitational}\text{ }\mathbf{force}:1.33\times {{10}^{{-9}}}N$

None

17.

If a person has a mass of 60 kg, what would be their weight on Earth? $ \displaystyle {(\text{Use }g=9.8m/{{s}^{2}})}$

Topic: Gravitational Force on the Earth

Weight: 58.8 N

Weight: 588 N

Weight: 60 N

Weight: 600 N

None

18.

What is the gravitational field strength at a height where the gravitational acceleration is $ \displaystyle 6.7m/{{s}^{2}}$ ?

Topic: Gravitational Field Strength

Field strength: 6.5 N/kg

Field strength: 7.5 N/kg

Field strength: 8.5 N/kg

Field strength: 9.5 N/kg

None

19.

How far will an object fall in 6 seconds if it is dropped from rest? $ \displaystyle {(\text{Use }g=9.8m/{{s}^{2}})}$

Topic: Free Fall Distance

Distance: 88.2 meters

Distance: 176.4 meters

Distance: 264.6 meters

Distance: 352.8 meters

None

20.

If a person has a mass of 75 kg on Earth, what would be their mass on Mars?

Topic: Mass on Different Planets

Mass: 25 kg

Mass: 50 kg

Mass: 75 kg

Mass: 100 kg

None

21.

If the height of an object is halved, how does its gravitational potential energy change?

Topic: Gravitational Potential Energy

It remains the same

It doubles

It halves

It quadruples

None

22.

Why do astronauts experience weightlessness in a space station orbiting the Earth?

Topic: Weightlessness

Because there is no gravity in space

Because the space station is in free fall

Because they are far from Earth

Because the space station has no mass

None

23.

If the distance between two objects is reduced by half, how does the gravitational force between them change?

Topic: Gravitational Force and Distance

It becomes one-fourth

It becomes one-half

It becomes twice

It becomes four times

None

24.

Which of the following forces is responsible for the orbital motion of planets around the Sun?

Topic: Gravity and Orbits

Centripetal force

Centrifugal force

Frictional force

Magnetic force

None

25.

What is the value of acceleration due to gravity at the surface of the Moon?

Topic: Acceleration due to Gravity

$ \displaystyle 1.6m/{{s}^{2}}$

$ \displaystyle 3.7m/{{s}^{2}}$

$ \displaystyle 5.5m/{{s}^{2}}$

$ \displaystyle 9.8m/{{s}^{2}}$

None

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Class 9 - Practice Level 2 – Gravitation set - 2

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