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

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

lower his centre of gravity

increase his weight

keep his centre of gravity in fixed position

raise his centre of gravity

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

four

two

three

five

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

None of these

neutral equilibrium

unstable equilibrium

stable equilibrium

4. The following expression represents:

Newton’s first Law of motion

the second condition of equilibrium

Newton’s second law of motion

the first condition of equilibrium

5. Force has:

none of these

only direction

both magnitude and direction

only magnitude

6. sin θ =:

base / hypotenuse

perpendicular / hypotenuse

perpendicular / base

7. The turning effect of force is called:

torque

moment of force and torque

moment of force

none of these

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

is at its base

is at highest position

remains at same height

is at the lowest position

9. Stability of a racing car is increased by:

decreasing its width

raising its centre of gravity

lowering its centre of gravity

increasing its height

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

remains above the point of contact

remains on one side of point of contact

passes over the point of contact

is at Lowest position

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

all of these

parallel, but opposite in direction

separated by a distance

equal in magnitude

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

a couple

unstable equilibrium

torque

equilibrium

13. Graphical method is used for addition of:

two dimensional vector quantities

all of these

one dimensional vector quantities

three dimensional vector quantities

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

passes over the point of contact

is positioned at its bottom

remains on one side of the point of contact

remains above the point of contact

15. 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 Like 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

16. According to the first condition for equilibrium:

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

sum of all torques acting on a body is constant

17. States of equilibrium are:

five

four

three

two

18. A force of 15 N makes an angle of 60 with horizontal. Its vertical component will be:

10N

15N

13N

19. A body is in equilibrium when it has:

uniform acceleration

zero acceleration

uniform speed and uniform acceleration

uniform speed

20. Torque depends upon:

the magnitude of the force and fulcrum

the direction of the force and fulcrum

the mass and fulcrum

the magnitude of the velocity and fulcrum

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