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

1. States of equilibrium are:

three

four

five

two

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

neutral equilibrium

none of these

unstable equilibrium

stable equilibrium

3. Force has:

only direction

only magnitude

none of these

both magnitude and direction

4. perpendicular / base = :

cos θ

sin θ

tan θ

cosec θ

5. A pair of unlike parallel forces having different lines of force produce _________:

unstable equilibrium

equilibrium

a couple

torque

6. The Center of gravity of uniform square or a rectangular sheet is the:

the mid-point on its axis

point of intersection of its diagonals

the point of intersection of its medians

its center

7. They form a couple.

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

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

8. The turning effect of force is called:

moment of force and torque

torque

moment of force

none of these

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

is at its base

is at the lowest position

remains at same height

is at highest position

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

neutral equilibrium

None of these

stable equilibrium

unstable equilibrium

11. Bunsen burner is made stable by:

increasing its base area

increasing its mass

increasing its length

decreasing its base area

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

unlike parallel forces

none of these

like parallel forces

parallel forces

13. The following expression represents:

the second condition of equilibrium

the first condition of equilibrium

Newton’s first Law of motion

Newton’s second law of motion

14. According to the second condition for equilibrium:

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

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 constant

15. The Center of gravity of a uniform triangular sheet is:

its center

the mid-point on its axis

the point of intersection of its medians

point of intersection of its diagonals

16. Stability of a racing car is increased by:

lowering its centre of gravity

raising its centre of gravity

decreasing its width

increasing its height

17. States of equilibrium are:

two

five

three

four

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

is at Lowest position

remains above the point of contact

passes over the point of contact

remains on one side of point of contact

19. sin θ =:

base / hypotenuse

perpendicular / base

perpendicular / hypotenuse

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

Newton metre

Newton per second

Newton

Newton second

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