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

1. Graphical method is used for addition of:

two dimensional vector quantities

all of these

one dimensional vector quantities

three dimensional vector quantities

2. 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

3. 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

4. The following expression represents:

the second condition of equilibrium

Newton’s first Law of motion

the first condition of equilibrium

Newton’s second law of motion

5. According to the second condition for equilibrium:

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 constant

sum of all torques acting on a body is zero

6. Stability of a racing car is increased by:

increasing its height

decreasing its width

lowering its centre of gravity

raising its centre of gravity

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

inertia

static equilibrium

acceleration due to gravity

dynamic equilibrium

8. perpendicular / base = :

cosec θ

sin θ

cos θ

tan θ

9. The turning effect of force is called:

moment of force

moment of force and torque

torque

none of these

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

Newton per second

Newton second

Newton metre

Newton

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

like parallel forces

unlike parallel forces

none of these

parallel forces

12. States of equilibrium are:

four

five

three

two

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

five

any number of

two

three

14. States of equilibrium are:

three

four

five

two

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

the mid-point on its axis

point of intersection of its diagonals

its center

the point of intersection of its medians

16. Torque depends upon:

the mass and fulcrum

the magnitude of the velocity and fulcrum

the direction of the force and fulcrum

the magnitude of the force and fulcrum

17. A body is in equilibrium when it has:

uniform speed

uniform acceleration

uniform speed and uniform acceleration

zero acceleration

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

remains at same height

is at the lowest position

is at highest position

is at its base

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

is positioned at its bottom

remains above the point of contact

remains on one side of the point of contact

passes over the point of contact

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

15N

13N

10N

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