Law of Motion MCQ question and answer with solution

11

Consider the following velocity and time graph.
Law of Motion mcq question image

Which one of the following is the value of average acceleration from 8 s' to 12 s?

A) 8 m/s² B) 12 m/s² C) 2 m/s² D) - 1 m/s²

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Answer & Solution

Answer: Option D

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12

The stock of books lying on the table does not move due to . . . . . . . .

A) inertia B) speed C) magnetism D) gravity

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Answer & Solution

Answer: Option A

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13

What will be the acceleration produced when a force of 21 N is applied on an object of mass 3 kg?

A) 0.007 ms^-2 B) 0.7 ms^-2 C) 7 ms^-2 D) 70 ms^-2

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Answer & Solution

Answer: Option C

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14

When a stationary bus starts moving, the people standing in it fall in the back direction. Which of the following law explains this situation?

A) Newton's first law of motion B) Newton's third law of motion C) Newton's second law of motion D) Law of momentum conservation

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Answer & Solution

Answer: Option A

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15

What was the year of publication of Newton's laws of motion?

A) 1678 B) 1778 C) 1787 D) 1687

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Answer & Solution

Answer: Option D

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16

Two persons are holding a rope of negligible mass horizontally. A 20 kg mass is attached to the rope at the mid-point, as a result, the rope deviates from the horizontal direction. The tension required to completely straighten the rope is (g = 10 m/s²)

A) 200 N B) 20 N C) 10 N D) infinitely large

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Answer & Solution

Answer: Option A

Solution:

When a mass is attached to the midpoint of a rope held horizontally by two persons, it causes the rope to deviate from the horizontal direction due to the force of gravity acting on the mass. To completely straighten the rope, the tension in the rope must counteract the gravitational force acting on the mass. Since the mass is 20 kg and the acceleration due to gravity (g) is 10 m/s², the gravitational force on the mass is given by F=mg, where m=20kg and g=10m/s².
Therefore, F=20×10=200N

So, the tension required to completely straighten the rope is 200 N.

17

Which one of the following statements is not correct?

A) If the velocity and acceleration have opposite sign, then the object is slowing down B) If the velocity is zero at an instant, then the acceleration should also be zero at that instant C) If the velocity is zero for a time interval, then the acceleration is zero at any instant within the time interval D) If the position and velocity have opposite sign, then the object is moving towards the origin

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Answer & Solution

Answer: Option B

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18

In which of the following cases of motions, the distance and displacement are equal?

A) If the car is moving an straight road B) If the car is moving in circular path C) The pendulum is moving to and fro D) The earth is revolving around the sun

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Answer & Solution

Answer: Option A

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19

Which one of the following has maximum inertia?

A) An atom B) A molecule C) A one rupee coin D) A cricket ball

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Answer & Solution

Answer: Option D

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20

In the given Velocity (v) versus Time (t ) graph, accelerated and decelerated motions are respectively represented by line segments.
Law of Motion mcq question image

A) CD and BC B) BC and AB C) CD and AB D) AB and CD

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Answer & Solution

Answer: Option C

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Law of Motion MCQ question and answer with solution | Physics Gk MCQs