Live Education Quiz

1. Which of the following increases impulse?

A Decreasing time

B Increasing time

C Decreasing force

D Decreasing momentum

2. The turning effect of a force is called:

A Momentum

B Pressure

C Work

D Torque

3. Impulse is equal to:

A Force × distance

B Force × time

C Mass × acceleration

D Momentum ÷ time

4. Formula of momentum is:

A p = mv

B p = ma

C p = m/v

D p = v/m

5. Momentum of a body depends on:

A Mass only

B Velocity only

C Mass and velocity

D Force and mass

6. Which law explains motion of rockets?

A First law

B Second law

C Third law

D Law of gravitation

7. A body is in equilibrium when its:

A acceleration is zero.

B speed is zero.

C velocity is non-uniform.

D displacement is zero.

8. If all forces acting on a body cancel each other, the resultant force is:

A Maximum

B Minimum

C Zero

D Infinite

9. Unit of impulse is:

A Newton

B Newton second

C Joule

D Watt

10. Impulse is equal to change in:

A Force

B Velocity

C Momentum

D Mass

11. SI unit of momentum is:

A kg m s⁻¹

B kg m s⁻²

C N s⁻¹

D J s

12. Why are airbags used in cars?

A To increase speed

B To decrease force by increasing time

C To reduce mass

D To stop motion instantly

13. If mass of a body is doubled and force remains same, acceleration will:

A Double

B Become half

C Remain same

D Become zero

14. Unit of force in SI system is:

A Dyne

B Joule

C Newton

D Watt

15. A couple is formed by:

A two forces perpendicular to each other.

B two equal and opposite forces not in the same line.

C two equal and opposite forces in the same line.

D two unequal forces.

16. Newton’s Third Law of Motion states that:

A Force equals mass times acceleration

B Every action has an equal and opposite reaction

C Body remains at rest or in motion

D Momentum is conserved

17. Principle of conservation of momentum states that:

A Momentum always increases

B Momentum is lost in collisions

C Total momentum remains constant

D Momentum depends on force

18. What is meant by the resultant force?

A Force that stops motion

B Single force having same effect as multiple forces

C Force due to gravity only

D Force applied by an object

19. The vertical or perpendicular component of a force F making an angle θ with the horizontal x-axis is given by:

A F cos(θ)

B F tan(θ)

C F sin(θ)

D F cot(θ)

20. The mathematical form of Newton’s Second Law is:

A F = mv

B F = ma

C F = m/a

D F = a/m

21. The centre of gravity of an irregularly shaped thin lamina can be found using a:

A Plumb line

B Screw gauge

C Vernier callipers

D Metre rule

22. Why does a gun recoil when a bullet is fired?

A Due to gravity

B Due to friction

C Due to Newton’s Third Law

D Due to inertia

23. Which of the following is an example of action-reaction pair?

A Weight and mass

B Push on wall and wall pushing back

C Friction and gravity

D Speed and velocity

24. Action and reaction forces act on:

A Same body

B Different bodies

C Same direction

D Same surface

25. Newton’s Second Law of Motion relates force with:

A Velocity

B Momentum

C Acceleration

D Distance

Chapter 4: Dynamics – II

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