Turning Effect of Forces – Online MCQs Test – Physics 9th

1. Bunsen burner is made stable by:

decreasing its base area

increasing its mass

increasing its base area

increasing its length

2. If a body is slightly titled and does not return back to its previous position, the body is said to be in:

unstable equilibrium

stable equilibrium

none of these

neutral equilibrium

3. According to the second condition for equilibrium:

sum of all torques acting on a body is constant

sum of the all forces acting on a body must be equal to zero

sum of the all, forces acting on a body must be constant

sum of all torques acting on a body is zero

4. States of equilibrium are:

five

two

three

four

5. According to the first condition for equilibrium:

sum of all torques acting on a body is zero

sum of all torques acting on a body is constant

sum of the all forces acting on a body must be equal to zero

sum of the all forces acting on a body must be constant

6. They form a couple.

two Like parallel forces of the same magnitude acting along the same line

two unlike parallel forces of the same magnitude not acting along the same line

two unlike parallel forces of the same magnitude acting along the same line

two Like parallel forces of the same magnitude not acting along the same line

7. Stability of a racing car is increased by:

increasing its height

lowering its centre of gravity

raising its centre of gravity

decreasing its width

8. A right rope walker carries a long pole to:

keep his centre of gravity in fixed position

raise his centre of gravity

increase his weight

lower his centre of gravity

9. A body is in neutral equilibrium when its center of gravity:

is at highest position

remains at same height

is at the lowest position

is at its base

10. perpendicular / base = :

tan θ

cosec θ

sin θ

cos θ

11. The turning effect of force is called:

none of these

moment of force

moment of force and torque

torque

12. A body is in stable equilibrium after slight tilt if its center of gravity:

is at Lowest position

passes over the point of contact

remains above the point of contact

remains on one side of point of contact

13. States of equilibrium are:

four

three

two

five

14. A body is in equilibrium when it has:

uniform speed

uniform acceleration

uniform speed and uniform acceleration

zero acceleration

15. A body is in unstable equilibrium after slight tilt if its center of gravity:

remains on one side of the point of contact

is positioned at its bottom

passes over the point of contact

remains above the point of contact

16. The forces that act along opposite directions are called:

unlike parallel forces

parallel forces

none of these

like parallel forces

17. When a body is slightly displaced and then released it returns to its previous position then the equilibrium will be:

unstable equilibrium

None of these

neutral equilibrium

stable equilibrium

18. S.I unit of the torque or moment of force is:

Newton per second

Newton metre

Newton second

Newton

19. Head to tail rule can be used to add_______ forces.

three

five

two

any number of

20. Force has:

only magnitude

both magnitude and direction

none of these

only direction

Class 9th | Physics | Chapter 4 | Turning Effect of Forces | Online MCQs Test