Online MCQs Quiz Unit-3: Forces and Motions

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HSSC-1 (Class-11) Physics (New Book/KPK Text Board, Peshawar)

1. A ball is thrown vertically upwards at 19.6 m/s. For its complete trip (up and back down to the starting position), its average speed is:

10 points

A. 19.6 m/s.

B. 9.8 m/s.

C. 6.5 m/s.

D. 4.9 m/s.

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2. If you throw a ball downward, then its acceleration immediately after leaving your hand, assuming no air resistance, is

10 points

A. 9.8 m/s².

B. more than 9.8 m/s².

C. less than 9.8 m/s²

D. Speed of throw is required for answer

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3. The time rate of change of momentum gives

10 points

A. Force

B. Impulse

C. Acceleration

D. Power

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4. The area between the velocity-time graph is numerically equal to:

10 points

A. Velocity

B. Displacement

C. Acceleration

D. Time

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5. If the slope of velocity-time graph gradually decreases, then the body is said to be moving with:

10 points

A. Positive acceleration

B. Negative acceleration

C. Uniform velocity

D. ZERO acceleration

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6. A 7.0 kg bowling ball experiences a net force of 5.0 N. What will be its acceleration?

10 points

A. 35 m/s²

B. 7.0 m/s²

C. 5.0 m/s²

D. 0.71 m/s²

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7. SI unit of impulse is: :

10 points

A. kgms²

B. N s

C. N s⁻¹

D. N m

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8. A ball with original momentum +4.0 kg m/s hits a wall and bounces straight back without losing any kinetic energy. The change it momentum of the ball is:

10 points

A. + 4 N s

B. - 4 N s

C. + 8 N s²

D. - 8 N s

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9. A body is traveling with a constant acceleration of 10 m s⁻². If S₁ is the distance traveled in 1st second and S₂ is the distance traveled in 2nd second, which of the following shows a correct relation between S₁ and S₂?

10 points

A. S₁ = S₂

B. S₁ = 3S₂

C. S₂ = 3S₁

D. 2S₂ = 3S₁

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10. During projectile motion, the horizontal component of velocity:

10 points

A. Changes with time

B. Becomes zero

C. Remains constant

D. Increases with time

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11. A projectile is thrown horizontally from a 490m high cliff with a velocity of 100 m s⁻¹. The time taken by projectile to reach the ground is

10 points

A. 2.5 s

B. 5.0 s

C. 7.5 s

D. 10 s

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12. A projectile is launched at 45° to the horizontal with an initial kinetic energy E. Assuming air resistance to be negligible what will be the kinetic energy of the projectile when it reaches its highest point?

10 points

A. 0.50 E

B. 0.71 E

C. 0.70 E

D. E

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13. To improve the jumping record the long jumper should jump at an angle of

10 points

A. 30°

B. 45°

C. 60°

D. 90°

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14. Range of a projectile on a horizontal plane is same for the following pair of angles:

10 points

A. 15° and 18°

B. 43° and 47°

C. 20° and 80°

D. 52° and 62°

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