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

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

parallel forces

none of these

like parallel forces

unlike parallel forces

2. States of equilibrium are:

two

four

three

five

3. sin θ =:

perpendicular / base

base / hypotenuse

perpendicular / hypotenuse

base / hypotenuse

4. 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

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

unstable equilibrium

stable equilibrium

none of these

neutral equilibrium

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

remains above the point of contact

passes over the point of contact

is at Lowest position

remains on one side of point of contact

7. Graphical method is used for addition of:

one dimensional vector quantities

three dimensional vector quantities

two dimensional vector quantities

all of these

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

inertia

dynamic equilibrium

acceleration due to gravity

static equilibrium

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

remains on one side of the point of contact

passes over the point of contact

remains above the point of contact

is positioned at its bottom

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

torque

equilibrium

a couple

unstable equilibrium

11. They form a couple.

two unlike 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 Like parallel forces of the same magnitude acting along the same line

12. The turning effect of force is called:

torque

moment of force

none of these

moment of force and torque

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

the point of intersection of its medians

point of intersection of its diagonals

the mid-point on its axis

its center

14. States of equilibrium are:

two

four

three

five

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

all of these

parallel, but opposite in direction

separated by a distance

equal in magnitude

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

Newton per second

Newton

Newton second

Newton metre

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

None of these

stable equilibrium

neutral equilibrium

unstable equilibrium

18. Torque depends upon:

the direction of the force and fulcrum

the mass and fulcrum

the magnitude of the force and fulcrum

the magnitude of the velocity and fulcrum

19. The following expression represents:

Newton’s first Law of motion

Newton’s second law of motion

the second condition of equilibrium

the first condition of equilibrium

20. Bunsen burner is made stable by:

increasing its length

decreasing its base area

increasing its base area

increasing its mass

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