HOTS Questions: Gravitation

# HOTS Questions: Gravitation - Class 9

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## 25 Questions MCQ Test Science Class 9 - HOTS Questions: Gravitation

HOTS Questions: Gravitation for Class 9 2023 is part of Science Class 9 preparation. The HOTS Questions: Gravitation questions and answers have been prepared according to the Class 9 exam syllabus.The HOTS Questions: Gravitation MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for HOTS Questions: Gravitation below.
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HOTS Questions: Gravitation - Question 1

### The S. I unit of G is

Detailed Solution for HOTS Questions: Gravitation - Question 1

Universal gravitational constant is represented by ‘G’. S.I. unit of universal gravitational constant is Nm2/Kg2. As G = Fxr2/Mm.

HOTS Questions: Gravitation - Question 2

### The mass of the body on the moon is 40kg, what is the weight on the earth.

Detailed Solution for HOTS Questions: Gravitation - Question 2

Given The mass of the body on moon is 40 kg , what is the weight on the earth ?

Now we have mass of body on moon m = 40 kg.

We know that weight on earth is given by mass x gravitational force

So w = m x g

w = 40 x 9.8 m/s2

w = 392 N

So weight on the earth is 392 N

HOTS Questions: Gravitation - Question 3

### A body is thrown upwards. What is the direction of ‘g’ when the body is falling down

Detailed Solution for HOTS Questions: Gravitation - Question 3

When a body is thrown upwards, the direction of ‘g ‘ is negative that slows down the speed of body. When the body is falling downward, the direction of ‘g’ is downward direction.

HOTS Questions: Gravitation - Question 4

Two objects of different masses are dropped freely from a height near the surface of earth they have
A. Different velocities at any instant
B. Same velocities at any instant
C. Different accelerations
D. Same acceleration

Detailed Solution for HOTS Questions: Gravitation - Question 4

The correct option is B.
Objects of different masses falling freely near the surface of the earth would have the same velocities at any instant because they will have the same acceleration due to gravity.

HOTS Questions: Gravitation - Question 5

Inverse square law means F α?

Detailed Solution for HOTS Questions: Gravitation - Question 5

The force acting on two bodies is inversely proportional to square of the distance between them. Therefore,Fα 1/r2.

HOTS Questions: Gravitation - Question 6

Statement B: At a given place the weight of an object is equal to mass of the objectWhich of the two statement is true?

Detailed Solution for HOTS Questions: Gravitation - Question 6

Polar radius is 6357 km and equatorial radius is 6378 km. The shape of earth is not perfectly spherical. Poles are slightly closer to centre of earth. Weight of body at particular place is product of mass and acceleration due to gravity. So, weight and mass of body at particular position never be equal.

HOTS Questions: Gravitation - Question 7

A man throws a ball with a velocity of 20m/s. After what time will the ball come back to his hands? (Take g = 10m/s2)

Detailed Solution for HOTS Questions: Gravitation - Question 7

Initial velocity ,u= 20 m/s. final velocity = o , g = 10ms−2 . V = u + gt, 0 = 20+(−10)×t20+(−10)×t, t = 20/10 = 2s. time taken to fall in downward direction = 2s. hence total time taken = 2s +2s = 4s.

HOTS Questions: Gravitation - Question 8

A stone falling towards earth
A. Is attracted by earth
B. Attracts the earth
C. Both stone and earth attract each other
D. No one attract each other

Detailed Solution for HOTS Questions: Gravitation - Question 8
Explanation:
When a stone falls towards the earth, both the stone and the earth attract each other due to the force of gravity. This is known as the law of universal gravitation. Here's a detailed explanation:
Law of Universal Gravitation:
- The law of universal gravitation states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
- This means that both the stone and the earth exert a gravitational force on each other.
Stone's attraction towards Earth:
- The stone is attracted towards the earth due to its gravitational force.
- The earth has a much larger mass than the stone, so the force of attraction is more significant on the stone.
- This force causes the stone to accelerate towards the earth, resulting in its fall.
Earth's attraction towards Stone:
- According to Newton's third law of motion, for every action, there is an equal and opposite reaction.
- As the stone attracts the earth towards itself, the earth also attracts the stone towards it with an equal force.
- However, due to the earth's large mass, the acceleration caused by this force is negligible and is not noticeable.
Conclusion:
- Both the stone and the earth attract each other due to the force of gravity.
- The stone falls towards the earth as a result of this attraction.
- Therefore, option (C) is correct: Both the stone and the earth attract each other.
HOTS Questions: Gravitation - Question 9

What is ratio of the force of gravitation between two mases mand m2 Kept at a distance R on the Earth and on the moon?

Detailed Solution for HOTS Questions: Gravitation - Question 9

Explanation:- Force of gravitation is equal to product of masses divided by square of the distance between them. So, the force of gravitation between two bodies will be the same irrespective of their place.

So, the ratio will be 1:1.

HOTS Questions: Gravitation - Question 10

Gravitation force is a

Detailed Solution for HOTS Questions: Gravitation - Question 10

Gravitational force is a weak force. This force exists between each and every object but cannot be felt until the mass of the bodies are not extremely high like planets.

HOTS Questions: Gravitation - Question 11

“The equation of motion for free fall can be used in case of any free fall” is

Detailed Solution for HOTS Questions: Gravitation - Question 11

The equation of motion for free fall can be used in case of falling of body only due to gravitation of earth without any other force. So, this statement is not true.

HOTS Questions: Gravitation - Question 12

What will be the pressure when a force of 200N it’s exerted on area of 5m2

Detailed Solution for HOTS Questions: Gravitation - Question 12

Pressure = force/ area. Here, Force = 200N. Area=5m2. So, pressure = 200N/5m 25m2 = 40 Pa.

HOTS Questions: Gravitation - Question 13

The value of G depends on

Detailed Solution for HOTS Questions: Gravitation - Question 13

The value of universal gravitational constant (G) is6.67×10−11Nm2/Kg Which is constant and independent of mass, distance between the bodies and other factors.

HOTS Questions: Gravitation - Question 14

Statement A: The Earth attract the moon with a force greater than the force with which the moon attracts the Earth.
Statement B: The mass and weight of a body becomes O at the centre of the Earth.
Which of the two statement is true?

Detailed Solution for HOTS Questions: Gravitation - Question 14

Earth and moon attracts each other with equal gravitational force. The mass of a body never becomes 0. Hence both statements are incorrect.

HOTS Questions: Gravitation - Question 15

What is the weight of body whose mass is 100 kg. on the surface of the earth

Detailed Solution for HOTS Questions: Gravitation - Question 15

Mass of the body (m) = 100 kg, acceleration due to gravity (g) =9.8 m/s29.8 m/s2. Weight (w) = m×gm×g=100×9.8100×9.8= 980N.

HOTS Questions: Gravitation - Question 16

In which of the following pressure is increased
A. Strap of bag is made wider
B. Knife with sharp edge
C. Shoes with flat sole
D. Nail with finely pointed tip

HOTS Questions: Gravitation - Question 17

Two masses m and M are kept at a distance r. The ratio of the force exerted on m due to M and that of M due to m is equal to

Detailed Solution for HOTS Questions: Gravitation - Question 17

Gravitational force between two bodies F = G Mm/r2G Mm/r2. The value of force exerted on m due to M will be equal to that of M due to m. so, the ratio will be 1;1.

HOTS Questions: Gravitation - Question 18

Force of gravitation
A. Directly proportional to the product of masses of two objects
B. Inversely proportional to the product of masses of two objects
C. Directly proportional to the square of distance between two objects
D. Inversely proportional to the square of distance between two objects

Detailed Solution for HOTS Questions: Gravitation - Question 18
Force of gravitation:
The force of gravitation between two objects is given by the universal law of gravitation, which states that the force is directly proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between them.
Key points:
- The force of gravitation is directly proportional to the product of the masses of two objects. This means that if the mass of one of the objects increases, the force of gravitation will also increase. Similarly, if the mass of both objects increases, the force of gravitation will increase even more.
- The force of gravitation is inversely proportional to the square of the distance between the two objects. This means that as the distance between the objects increases, the force of gravitation decreases. Conversely, as the distance decreases, the force of gravitation increases.
- The force of gravitation acts between all objects in the universe, but its strength decreases rapidly with increasing distance. This is why we usually only notice the force of gravitation between large objects like planets and stars.
- The force of gravitation is a fundamental force of nature and plays a crucial role in shaping the structure and behavior of the universe. It is responsible for keeping planets in orbit around the sun, for the tides on Earth, and for many other phenomena.
Conclusion:
The force of gravitation is directly proportional to the product of the masses of two objects and inversely proportional to the square of the distance between them. Therefore, option A, which states that the force of gravitation is directly proportional to the product of masses of two objects and inversely proportional to the square of distance between two objects, is the correct answer.
HOTS Questions: Gravitation - Question 19

The weight of an object is greatest at some region of the earth. What will be the colour of bears found in that region.

Detailed Solution for HOTS Questions: Gravitation - Question 19

Weight:

1. The weight of a body on the earth is the force with which the earth attracts a body.
2. The formula for the weight is 3. The weight of a body depends on the mass and the acceleration due to gravity.
4. Earth is not a perfect sphere. The radius at the equator is greater than the poles.
5. Acceleration due to gravity is inversely proportional to the square of the radius. So, the value of acceleration due to gravity (g) is greatest at the poles.
6. Weight depends on acceleration due to gravity and acceleration due to gravity is greatest at the poles. So, the weight of a body is greatest in the region of the pole.
7. The bears found in the polar region are polar bears which are white in color

Hence, the weight of an object is greatest in the region of the pole and the bears found in the polar regions are white in color.

HOTS Questions: Gravitation - Question 20

What is buoyant force-

Detailed Solution for HOTS Questions: Gravitation - Question 20

The upward force experienced by the body when partially or completely submersed in fluid.

HOTS Questions: Gravitation - Question 21

Which of the two statements is true?
Statement A: The force of gravitation may be attractive or repulsive.
Statement B: Inverse square law means Detailed Solution for HOTS Questions: Gravitation - Question 21

Gravitational force is always attractive in nature irrespective of the distance and mass of bodies. this decreases with distance but cannot be repulsive.

In science, an inverse-square law is any scientific law stating that a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity.Since the gravitational field lines go radially inward towards the mass, the density of the field lines would be inversely proportional to the surface over which they are spread over and therefore inversely proportional to r^2. Since force is proportional to the density of field lines, the force is inversely proportional to distance squared.

HOTS Questions: Gravitation - Question 22

Which of the following is an application of Earth’s gravitation
A. It holds atmosphere around our globe
B. It holds us firmly on the surface of the Earth
C. It is responsible for motion of moon
D. It is responsible for sea tides due to the moon

Detailed Solution for HOTS Questions: Gravitation - Question 22
Application of Earth's Gravitation:
- Holding the atmosphere around our globe: Earth's gravity holds the atmosphere close to the surface of the Earth. Without gravity, the atmosphere would disperse into space.
- Keeping us firmly on the surface of the Earth: Earth's gravity pulls everything towards its center, which keeps us and all objects on the surface of the Earth. It gives us our weight and prevents us from floating away.
- Motion of the moon: Earth's gravity also affects celestial bodies like the moon. The gravitational force between the Earth and the moon keeps the moon in its orbit around the Earth.
- Causing sea tides due to the moon: The gravitational pull of the moon on the Earth's oceans creates the phenomenon of tides. The moon's gravity causes the water to bulge towards the moon, creating high tide, and also causes a bulge on the opposite side of the Earth, creating low tide.
Conclusion:
Earth's gravitation has multiple applications, including holding the atmosphere, keeping us on the surface, influencing the motion of the moon, and creating sea tides.
HOTS Questions: Gravitation - Question 23

An object weighs 10N when measured on the surface of the Earth. What would be its weight when measured on the surface of the moon?

Detailed Solution for HOTS Questions: Gravitation - Question 23

Acceleration due to gravity (g) on moon is 1/6th of the acceleration of gravity (g) on earth. So, weight of body of 10N on the surface of moon will be 1/6×10N = 1.67N.

HOTS Questions: Gravitation - Question 24

Find the incorrect statement.

Detailed Solution for HOTS Questions: Gravitation - Question 24

Value of g depends upon mass of the planet and radius, acceleration due to gravity does not change due to air friction. Body moving in upward direction will have gravitational force in downward direction.

Mass is a scalar quantity. It is a measure of the inertia of an object. Mass can be represented by a number only. The SI unit of mass is kg.

HOTS Questions: Gravitation - Question 25

According universal law of Gravitation
(i) Force is directly proportional to product of masses of two bodies
(ii) Force is inversely proportional to square of distance between two bodies
(iii) Force is directly proportional to square of distance between two bodies
(iv) Force is inversely proportional to product of masses of two bodies

Detailed Solution for HOTS Questions: Gravitation - Question 25
Explanation:
The universal law of gravitation states that the force between two bodies is determined by the following factors:
(i) Force is directly proportional to the product of masses of two bodies:
- This means that as the mass of one body increases, the force of attraction between the two bodies also increases.
- Mathematically, this can be represented as F ∝ m1 * m2, where F is the force and m1 and m2 are the masses of the two bodies.
(ii) Force is inversely proportional to the square of the distance between two bodies:
- This means that as the distance between two bodies increases, the force of attraction between them decreases.
- Mathematically, this can be represented as F ∝ 1/r^2, where F is the force and r is the distance between the two bodies.
Therefore, the correct answer is C: (i) and (ii)

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