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

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

Newton second

Newton metre

Newton

Newton per second

2. They form a couple.

two unlike 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

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

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

the mid-point on its axis

the point of intersection of its medians

point of intersection of its diagonals

its center

4. Bunsen burner is made stable by:

increasing its mass

increasing its length

decreasing its base area

increasing its base area

5. 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 constant

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

sum of all torques acting on a body is zero

6. A body is in equilibrium when it has:

uniform speed

uniform acceleration

zero acceleration

uniform speed and uniform acceleration

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

two

any number of

three

five

8. sin θ =:

base / hypotenuse

perpendicular / hypotenuse

perpendicular / base

9. The following expression represents:

the second condition of equilibrium

Newton’s first Law of motion

Newton’s second law of motion

the first condition of equilibrium

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

unlike parallel forces

none of these

like parallel forces

parallel forces

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

unstable equilibrium

none of these

stable equilibrium

neutral equilibrium

12. 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

is at Lowest position

passes over the point of contact

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

the point of intersection of its medians

the mid-point on its axis

point of intersection of its diagonals

its center

14. Torque depends upon:

the direction of the force and fulcrum

the magnitude of the force and fulcrum

the magnitude of the velocity and fulcrum

the mass and fulcrum

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

four

two

five

three

16. Force has:

both magnitude and direction

only direction

only magnitude

none of these

17. 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

18. According to the first condition for equilibrium:

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

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

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

10N

15N

13N

20. A paratrooper moving down with terminal velocity satisfies:

the second condition of equilibrium

the first condition of equilibrium

Law of gravitation

Newton’s second law of motion

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