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

1. sin θ =:

perpendicular / base

base / hypotenuse

perpendicular / hypotenuse

2. A paratrooper moving down with terminal velocity satisfies:

Law of gravitation

the second condition of equilibrium

Newton’s second law of motion

the first condition of equilibrium

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

Newton per second

Newton metre

Newton second

Newton

4. States of equilibrium are:

five

four

two

three

5. Force has:

none of these

both magnitude and direction

only magnitude

only direction

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

the point of intersection of its medians

its center

the mid-point on its axis

point of intersection of its diagonals

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

keep his centre of gravity in fixed position

raise his centre of gravity

lower his centre of gravity

increase his weight

8. The following expression represents:

Newton’s second law of motion

Newton’s first Law of motion

the second condition of equilibrium

the first condition of equilibrium

9. Graphical method is used for addition of:

all of these

two dimensional vector quantities

three dimensional vector quantities

one dimensional vector quantities

10. perpendicular / base = :

tan θ

sin θ

cos θ

cosec θ

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

sum of all torques acting on a body is zero

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

is at Lowest position

remains on one side of point of contact

passes over the point of contact

remains above the point of contact

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

five

two

three

any number of

15. 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 not 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 acting along the same line

16. States of equilibrium are:

four

three

two

five

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

like parallel forces

unlike parallel forces

parallel forces

none of these

18. The turning effect of force is called:

moment of force and torque

torque

moment of force

none of these

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

its center

point of intersection of its diagonals

the mid-point on its axis

the point of intersection of its medians

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

four

three

two

five

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