Physics MCQ

Assertion (A): The position of the centre gravity of a body remains unchanged even when the body is deformed.
Reason (A): The centre of gravity of a freely suspended body always lies below the point of suspension

Assertion (A): Actually, rotation is always produced by a pair of forces.
Reason (R): The pair of forces formed by the external force and the force of reaction is called a couple.

Two equal and unlike parallel forces of magnitude 16 N acting on a rigid body, such that moment of couple is 12 Nm. The arm of couple is

A force of 525 N produces a moment of force of 420 Nm. The shortest distance between the point of application of force and the turning point is

The moon revolving around the earth is in

Calculate the length of arm of a couple, if a force of 13 N produces a moment of couple of 14.3 Nm.

The centre of gravity of a triangular lamina is situated at

The perpendicular distance between the two equal and unlike parallel forces which constitutes a couple is called

The given figure shows two forces each of magnitude 10 N acting at the points A and B at a separation of 50 cm, in opposite directions. What is the resultant moment of the two forces about the point A?

According to principle of moments, in equilibrium,

The centre of gravity of hollow cone of height h is at a distance x from its vertex where the value of x is

The moment of a force of 5 N about a point X is 2 Nm. Calculate the distance of point of application of the force from the point P

When a body remains in the same state of motion, under the influence of the several forces, the body is said to be in

In a circular motion

A physical balance works on the principle of

A uniform metre rule of mass 100 g is balanced on a fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm. The value of m is

A solid body can be balanced by supporting at its

The centre of gravity of the body changes, if it is

A half metre rod is pivoted at the centre with two weights 20 gf and 12 gf suspended at a perpendicular distance of 6 cm and 10 cm from the pivot respectively as shown below:

Which of the two forces acting on the rigid rod causes clockwise moment?

The centre of gravity of a cricket ball is at

A body is acted upon by two equal and opposite forces along different lines of action of force. The body will have

The moment of couple is mathematically the

In SI system, the unit of moment of force is

The turning effect produced in a rigid body around a fixed point by the application of force is called

The point of action of force on a rigid body is

To open and shut a door, we apply a force normal to the door at its handle which is provided at the

The diagram given alongside shows a force F=5 N, acting at a point A produces a moment of force of 6 Nm about point O. The diameter of wheel is 

A force of 50 N produces a moment of force of 10 Nm in a rigid body. The perpendicular distance between the point of application of force and the turning point is

Two forces each of 5 N act vertically upwards and downwards respectively on the two ends of uniform metre rule which is placed at its mid point as shown in the diagram. The resultant moment of these forces about the mid-point is

The CGS unit of moment of force is: