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

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

two

five

any number of

three

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

equilibrium

unstable equilibrium

torque

a couple

3. States of equilibrium are:

three

two

four

five

4. The turning effect of force is called:

moment of force

torque

moment of force and torque

none of these

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

remains above the point of contact

passes over the point of contact

is at Lowest position

remains on one side of point of contact

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

stable equilibrium

neutral equilibrium

unstable equilibrium

none of these

7. 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 acting along the same line

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

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

8. perpendicular / base = :

tan θ

cos θ

sin θ

cosec θ

9. To form a couple, two forces must be:

equal in magnitude

all of these

parallel, but opposite in direction

separated by a distance

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

the mid-point on its axis

the point of intersection of its medians

its center

point of intersection of its diagonals

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

neutral equilibrium

stable equilibrium

unstable equilibrium

None of these

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

unlike parallel forces

none of these

like parallel forces

parallel forces

13. Force has:

none of these

only magnitude

only direction

both magnitude and direction

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

increase his weight

lower his centre of gravity

keep his centre of gravity in fixed position

raise his centre of gravity

15. According to the first 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 constant

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

sum of all torques acting on a body is zero

16. States of equilibrium are:

two

three

five

four

17. A body must satisfy __________ conditions to be in equilibrium.

two

five

three

four

18. Stability of a racing car is increased by:

raising its centre of gravity

decreasing its width

lowering its centre of gravity

increasing its height

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

remains at same height

is at highest position

is at the lowest position

is at its base

20. A paratrooper moving down with terminal velocity satisfies:

Law of gravitation

the first condition of equilibrium

the second condition of equilibrium

Newton’s second law of motion

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