Physics MCQs for Class 9 with Answers Chapter 3

Forces on doubled arm spanner are called.

Torque

Couple

Moment of force

Momentum arm

Unit of Resultant force is:

Nm-2

N.m

Nm-1

N

At what angle sin? and cos? has same values:

30o

45o

60o

90o

Torque is a ___________ quantity.

Vector

Scalar

Base

All of these

The forces that are parallel to each other and have the same direction are called:

Like parallel forces

Unlike parallel forces

Resultant forces

Net forces

Tan ? is equal to:

Perpendicular/Hypotenuse

Base / Perpendicular

Base/Hyp

Perpendicular/Base

A force of 200 N is making an angle of 30°. What is horizontal component?

173.2 N

100 N

600 N

None of these

The number of perpendicular components of a force are

1

2

3

4

_____________ is centre from which its mass is equally distributed:

Cebtre of mass

Centre of gravity

All of above

None

The unit of torque is:

Nm-2

Ncm

Nm-1

Nm