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Gravitation

Description: All about Gravitation with type of questions, physics questions, practice tests
Number of Questions: 15
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Tags: Gravitation Mass Weight Thrust Pressure Gravitation questions CBSE board questions Newton Law of Universal Gravitation Universal Law of Gravitation: Qualitative Application Free Fall Gravitation Factors Influencing Gravitational Acceleration Concept of Weight and Mass Variations in the Value of g
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Which of the following are significances of Universal Law of Gravitation? (a) It is applicable to every object in the universe. (b) It is the cause of revolution of moon around the earth and revolution of planets around the sun. (c) When an object is immersed fully or partially in a liquid, it experiences an upward force. (d) It explains the cause of neap tide due to moon and sun.

  1. both a and b

  2. both b and c

  3. a, b and c

  4. b, c and d

  5. a, b and d

Show answer
Correct Option: E
Explanation:

Yes, it is the correct answer, as all the three statements mention the importance of the Universal Law of Gravitation.

A pile of carom coins is hit with a striker, the lowest coin moves away but rest of the pile stays as it is in rest, moving down. Which of the following explains it best?

  1. The pile of coin weighs more than the single coin pushed away.

  2. The pile of coin has more volume.

  3. The pile of the coin possess inertia of rest.

  4. The space created by the lowest coin had to be occupied.

  5. More force was required to make the pile of coin fall.

Show answer
Correct Option: C
Explanation:

Yes, it is correct. It is inertia because of which an object in rest has tendency to remain in rest. The pile of coin already in rest, continues to remain in rest.

If two boxes A and B are of weight 80 kg and 145 kg respectively, then

  1. A has more inertia than B

  2. B has more inertia than A

  3. B is heavy so it has inertia, A has no inertia

  4. A and B have the same inertia

  5. A is light so has inertia, B has no inertia

Show answer
Correct Option: B
Explanation:

Yes, it is correct. Inertia depends upon the mass of an object. Object having greater mass has greater inertia and vice versa. Hence, B has more inertia than A.

Which of the following is not an example of a free fall?

  1. A boy throws a ball down from a window.

  2. Mango after ripening falls from the tree.

  3. A small bird falls down when a vulture pushes it until it touches the ground.

  4. A stone thrown up, stops at a certain height and then falls down.

  5. A baby falls from the terrace.

Show answer
Correct Option: C
Explanation:

Yes, it is the correct answer as the bird is being pushed down by the vulture. It is not falling freely under the influence of gravitational force.

The handles of suitcases or heavy luggage items have broad straps. What is the best reason behind this?

  1. To give it an elegant look.

  2. To give the top of suitcase a support.

  3. Lesser pressure facilitates a person holding it.

  4. More force can be applied easily.

  5. It will be attached to the suitcase more strongly.

Show answer
Correct Option: C
Explanation:

Yes, even though the luggage is heavy and it weighs more, the force acting per unit area decreases with broad straps of the handles. Thus, lesser pressure facilitates a person holding these items.

Thrust acting upon a unit area is called ___________.

  1. thrust per area

  2. force

  3. unit thrust

  4. pressure

  5. unit force

Show answer
Correct Option: D
Explanation:

Yes, it is correct. Thrust acting upon a unit area is called pressure. Its S.I. unit is Pascal denoted by ‘P’

Why does fluid in a container exert pressure on all sides of the inner wall of the container?

  1. Fluid has more volume

  2. Fluid has more weight

  3. Fluid has no fixed shape

  4. Fluid is pushed up and towards the wall

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, fluid exerts pressure in all directions over the inner wall of a container in which they are kept because fluids have no definite shape.

Why is it easier to swim in sea water than in fresh water?

  1. Sea water is a large water body.

  2. Movement in sea water is less.

  3. Sea water has more of dissolved oxygen.

  4. Sea water is saline.

  5. All of the above

Show answer
Correct Option: D
Explanation:

Yes, it is correct as salts dissolved in sea water increase the density and hence, it exerts more upward thrust.

Manohar threw a stone in a pond and the stone sunk in the water. Why?

  1. The force exerted by the stone is greater than buoyancy of fluid.

  2. The force exerted by the stone is equal to the buoyancy of the fluid.

  3. There is no upward force exerted by the water.

  4. There is only gravitational force acting on it.

  5. The density of the stone is less than the density of the fluid.

Show answer
Correct Option: A
Explanation:

Yes, if the force exerted by the object is greater than the upward thrust or buoyancy by water, the object sinks in water otherwise it floats over water.

Which of the following statements is false regarding gravitation?

  1. Physical bodies are attracted towards each other.

  2. The pull of Earth can be seen.

  3. An object falls towards the ground when dropped from a height.

  4. It gives weight to the object.

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer, as this statement is incorrect. Earth attracts everything towards it by an unseen force of attraction.

When density of a substance is expressed in comparison with _________, it is called relative density.

  1. air

  2. water

  3. vacuum

  4. another substance

  5. none of these

Show answer
Correct Option: B
Explanation:

Yes, when the density of a substance is expressed in comparison with water, it is called relative density.

Which of the following statements is false regarding buoyancy?

  1. It is the upward force exerted by all the objects.

  2. If the density of the object is greater than the density of the fluid, the weight will be more than the buoyancy.

  3. If the object is floating on water, it has positive buoyancy.

  4. Because of buoyancy of air a bird or aeroplane can fly in air.

  5. Buoyancy is affected by the volume of the immersed object.

Show answer
Correct Option: A
Explanation:

Yes, it is the correct answer, as this is the false statement regarding buoyancy. Buoyancy is the upward force exerted by fluids over the surface area of contact of an object which is immersed in fluids.

Chandrayan was launched from ISRO to explore the moon in 2008. A change in mass (M) and weight (W) of the satellite was observed. Which of the following option shows it correctly?

  1. M decreased and W was constant

  2. M decreased and W increased

  3. M was constant and W increased

  4. M was constant and W decreased

  5. M increased and W was constant

Show answer
Correct Option: D
Explanation:

Yes, it is the correct answer. Mass will remain the same whether that object is on the moon, on the earth or anywhere in the universe. Weight of an object on the earth is the force by which earth attracts that very object towards it, which becomes less on moon.

Which of the following shows the maximum force of attraction between the two objects A and B? (a) A with mass 30 kg and B with mass 35 kg and distance between them is 10 m. (b) A with mass 50 kg and B with mass 35 kg and distance between them is 8 m. (c) A with mass 20 kg and B with mass 30 kg and distance between them is 20 m. (d) A with mass 10 kg and B with mass 15 kg and distance between them is 5 m. (e) A with mass 30 kg and B with mass 20 kg and distance between them is 10 m.

  1. a

  2. b

  3. c

  4. d

  5. e

Show answer
Correct Option: B
Explanation:

Yes, it is correct as this shows the maximum force of attraction between A and B. F = G x M x m / D x DF = G x 27.3 N

Free fall is a kind of motion that everybody can observe in daily life. How is the speed affected? After starting (S1), midway (S2), just before crash (S3), on touching the ground (S4)

  1. S1 > S2 > S3 > S4

  2. 0 < S2 < S3 > 0

  3. S1 < S2 < S3 > 0

  4. S1 < S2 < S3 < S4

  5. 0 < S2 < S3 > S4

Show answer
Correct Option: C
Explanation:

Yes, at the beginning it has less speed and until the end it gains speed and before the crash it reaches its maximum speed. Then, after the crash it becomes zero.

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