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

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

point of intersection of its diagonals

the mid-point on its axis

its center

the point of intersection of its medians

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

five

two

four

three

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

Newton metre

Newton

Newton per second

Newton second

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

increase his weight

raise his centre of gravity

keep his centre of gravity in fixed position

lower his centre of gravity

5. sin θ =:

perpendicular / base

base / hypotenuse

perpendicular / hypotenuse

6. 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

7. Force has:

both magnitude and direction

only magnitude

only direction

none of these

8. Bunsen burner is made stable by:

increasing its mass

decreasing its base area

increasing its base area

increasing its length

9. A wall hanging, buildings, bridges or any object lying in rest on the ground are some examples of:

dynamic equilibrium

acceleration due to gravity

inertia

static equilibrium

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

remains on one side of point of contact

passes over the point of contact

is at Lowest position

remains above the point of contact

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

15N

13N

10N

12. 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 constant

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

13. Torque depends upon:

the magnitude of the velocity and fulcrum

the magnitude of the force and fulcrum

the direction of the force and fulcrum

the mass and fulcrum

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

stable equilibrium

none of these

neutral equilibrium

unstable equilibrium

15. States of equilibrium are:

two

three

four

five

16. States of equilibrium are:

two

four

three

five

17. The turning effect of force is called:

torque

none of these

moment of force and torque

moment of force

18. A body is in equilibrium when it has:

uniform speed and uniform acceleration

uniform speed

uniform acceleration

zero acceleration

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

parallel, but opposite in direction

equal in magnitude

separated by a distance

all of these

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