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Force and Law of Motion

Description: All about force and motion
Number of Questions: 15
Created by:
Tags: Force Motion Matter Force Balancing of Force Matter & Classification Matter in our Surroundings Change of State of Matter Principle of Inertia and First Law Momentum and Second Law
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What is the push or pull applied on any object to do any work called?

  1. Motion

  2. Force

  3. Speed

  4. Velocity

  5. Friction

Show answer
Correct Option: B
Explanation:

Yes, it is correct. Force is the push or pull required to do a work.

Which of the following actions does not show any effect of force?

  1. Football is kicked

  2. Applying brakes in a car

  3. Turning handle of a cycle to turn

  4. Changing the colour of wall

  5. Stretching a rubber band

Show answer
Correct Option: D
Explanation:

Yes, it is the correct answer, as this is not because of force.

A force equal in magnitude and opposite in direction is called ____________.

  1. balanced force

  2. unbalanced force

  3. frictional force

  4. gravitational force

  5. none of these

Show answer
Correct Option: A
Explanation:

Yes, balanced force is equal in magnitude and opposite in direction.

If the resultant of applied forces is always_________, the forces are called unbalanced forces.

  1. zero

  2. less than zero

  3. more than zero

  4. equal to one of the forces

  5. equal to frictional force

Show answer
Correct Option: C
Explanation:

Yes, if the resultant of applied forces is greater than zero, it is called unbalanced forces.

Change of liquid into vapors is called vaporization. When does water change into its vapour form?

  1. When water is hot

  2. When water is warm

  3. When water reaches 100oC

  4. When water is heated above its boiling temperature

  5. When water reaches its vaporization temperature

Show answer
Correct Option: D
Explanation:

Yes, when water is heated after reaching 100oC water starts boiling. At this temperature water turns into vapour.

Assertion(A): When the pile of coins on the carrom-board is hit by a striker; only the coin at the bottom moves away, leaving rest of the pile of coins at same place. Reason(R): Coin at the bottom comes in motion, while rest of the coins in the pile have tendency to remain in rest and they vertically fall on the carrom board and remain at the same place.

  1. Both A and R are correct and R is correct reason for A

  2. A is correct but R is incorrect

  3. Both are correct but R is not the correct reason for A

  4. Both A and R are incorrect

  5. A is correct and R is incomplete reason

Show answer
Correct Option: A
Explanation:

Yes, both are correct. When the pile of coins on the carrom board is hit by a striker; the coin only at the bottom moves away, leaving rest of the pile of coins at the same place. This happens because when the pile is struck with a striker, the coin at the bottom comes in motion while rest of the coins in the pile has tendency to remain in the rest and they vertically fall on the carom board and remain at same place.

Before hanging the wet clothes over laundry line, usually many jerks are given to the clothes to get them dried quickly. Because of the jerks, droplets of water in the pores of the cloth _______________.

  1. gradually reduce in size

  2. evaporate

  3. fall down

  4. spread evenly

  5. join together and fall down

Show answer
Correct Option: C
Explanation:

Yes, water droplets fall on the ground, which helps the clothes dry quickly. This happens because, when suddenly the cloth is in motion by giving jerks, the water droplets in it have tendency to remain in rest and they are separated from cloths and fall on the ground.

Match the following:

     
1 Gas into liquid a Melting
2 Solid to liquid b Vaporization
3 Liquid to gas c Condensation

  1. 1 - b, 2 - a, 3 - c

  2. 1 - c, 2 - a, 3 - b

  3. 1 - a, 2 - c, 3 - b

  4. 1 - b, 2 - c, 3 - a

  5. 1 - a, 2 - b, 3 - c

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The change of solid to liquid is called melting. The change of liquid to gas is called the vaporization. The change of gas into liquid is called condensation.

Which of the following processes takes place only when temperature is decreased?

  1. Boiling

  2. Evaporation

  3. Melting

  4. Vaporization

  5. Condensation

Show answer
Correct Option: E
Explanation:

Yes, it is correct. Condensation takes place only on decreasing the temperature.

Newton's second law of motion states that, ''The rate of change of momentum is _____________''.

  1. directly proportional to F in the direction of force

  2. inversely proportional to F in the direction of force

  3. inversely proportional to F in the opposite direction of force

  4. directly proportional to F in the opposite direction of force

  5. directly proportional to F and independent of direction of force

Show answer
Correct Option: A
Explanation:

 Yes, the rate of change of momentum increases and the increase is in the direction of motion because the force is being applied in the direction of motion.

While catching a cricket ball, the momentum of ball is _________ when it is stopped immediately after coming in the hands of fielder.

  1. reduced to zero suddenly

  2. increased suddenly

  3. reduced gradually

  4. increased gradually

  5. is not effected

Show answer
Correct Option: A
Explanation:

Yes, it is the correct answer. If the ball is stopped suddenly, its momentum will be reduced to zero instantly.

To move a cupboard weighing 70 kg, force applied is 250 N. The frictional force exerted on the cupboard will be ___________.

  1. (250 x 70) N

  2. 70 N

  3. 250 N

  4. (250 + 70) N

  5. (250 - 70) N

Show answer
Correct Option: C
Explanation:

Yes, according to third law of motion, an equal magnitude of force will be applied in the opposite direction. Hence, the answer is 250 N.

Ramesh wanted to move his hand freely in gas, liquid and solid. But could not move in solid, which of the following is the best reason?

  1. Solid is made up of one hard particle

  2. Solid particles keep randomly moving

  3. Solid particles have no space in between

  4. As Sri was applying less force

  5. The surface of solid particles is slippery

Show answer
Correct Option: C
Explanation:

Yes, the force of attraction between particles of solid isthe greatest. To move our hand in liquid, such as water, we have to apply some force, but in a solid such as wood, we cannot move our hand.

Which of the following statements regarding unbalanced force is false? (a) Moves a stationary object. (b) Increases the speed of a moving object. (c) Decreases the speed of a moving object. (d) Stops a moving object. (e) Cannot change the shape and size of an object.

  1. a

  2. b

  3. c

  4. d

  5. e

Show answer
Correct Option: E
Explanation:

Yes, it is correct, as the statement is false. Unbalanced force can change the shape and size of an object.

Mr. Robert Brown, a Scottish botanist observed that ____________________, it is called Brownian motion.

  1. sugar gets dissolved in water

  2. the random movement of pollen grains in water

  3. dancing particles of dust in sun beam

  4. mixing of two gases of different colours

  5. all of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. Mr. Robert Brown, a Scottish botanist observed the random movement of pollen grains in water in 1827, it is called Brownian motion.

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