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Laws of Motion PHYSICS - Laws of Motion

ICSE - STD 9 - PHYSICS (ICSE - English Medium). 158 questions in this chapter.

Question types

Laws of Motion question types

158 questions across 5 question groups — pick any mix to generate a PHYSICS paper with step-by-step answer keys.

158
Questions
5
Question groups
5
Question types
Sample Questions

Laws of Motion questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
An object falling freely from rest reaches ground in $2 s .$ If acceleration due to gravity is $9.8\ m s ^{-2}$, then the velocity of object on reaching the ground will be
  • A
    $9.8\ m s ^{-1}$
  • B
    $4.9\ m s ^{-1}$
  • ✓
    $19.6\ m s ^{-1}$
  • D
    Zero

Answer: C.

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Q 2MCQ1 Mark
A body is projected vertically upward with an initial velocity $u.$ If acceleartion due to gravity is $g,$ the time for which it remains in air , is :
  • A
    $\frac{u}{g}$
  • B
    $ug$
  • ✓
    $\frac{2 u}{g}$
  • D
    $\frac{u}{2 g}$

Answer: C.

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Q 3MCQ1 Mark
The force of attraction between two masses each of $1\ kg$ kept at a separation of $1 m$ is :
  • A
    $9.8\ N$
  • B
    $6.7\ N$
  • C
    $980\ N$
  • ✓
    $6.7 \times 10^{-11}\ N$

Answer: D.

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Q 4MCQ1 Mark
The gravitational force between two bodies is :
  • A
    Always repulsive
  • ✓
    always attractive
  • C
    attractive only at large distance
  • D
    Repulsive only at large distance .

Answer: B.

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Q 5MCQ1 Mark
Action and reaction act on :
  • A
    Same body in opposite directions.
  • ✓
    Different bodies in oppposite directions.
  • C
    Different bodies , but in the same direction.
  • D
    Same body in the same direction.

Answer: B.

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Q 14[2 Mark Question Answer]2 Marks
The weight of a body on Earth is $98 N$ , where acceleration due to gravity is $9.8 m s ^{-2}$. What will be its $(a)$ mass and $(b)$ weight on the Moon, where acceleration due to gravity is $1.6 m s ^{-2} ?$
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Q 19[3 Mark Question Answer]3 Marks
 A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the water surface in the well. Taking g $=10 m s ^{-2}$ and speed of sound $=330 m s ^{-1}$. Find: The time when echo is heard after the pebble is dropped.
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Q 21[5 Mark Question Answer]5 Marks
A ball is thrown vertically upwards from the top of a tower with an initial velocity of $19.6 m s ^{-1}$. The ball reaches the ground after 5 s . Calculate:
(i) The height of the tower, (ii) The velocity of the ball on reaching the ground. Take $g =9.8 ms^{-2}$.
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Q 24[5 Mark Question Answer]5 Marks
 A bullet of mass $50$ g moving with an initial velocity $100 m s ^{-1}$ strikes a wooden block and comes to rest after penetrating a distance $2$ cm in it. Calculate: (i) Initial momentum of the bullet, (ii) Final momentum of the bullet, (iii) Retardation caused by the wooden block and (iv) Resistive force exerted by the wooden block.
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