The inherent property of a body which offers reluctance to change its state of rest or uniform motion, is

Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line?

A

Force

B

Mass

C

Momentum

D

Inertia

An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's

A

First law

B

Second law

C

Third law

D

Fourth law

The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)

A

$$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$

B

$$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$

C

$$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$

D

$$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$

The tendency of a body to resist change from rest or motion is known as

A

Mass

B

Friction

C

Inertia

D

Resisting force

On fixed deposits, Bank X offers an interest of 13.5% per year and Bank Y offers 14.00% per annum. Arianna kept taka one million with Bank X for a year and Tatiana kept the same amount in Bank Y also for a year? How much did Arianna lose at the end of the year in taka?

A

5,000

B

6,000

C

4,500

D

5,500

What cause a moving body to resist a change in its state of motion?

A

Displacement

B

Acceleration

C

Inertia

D

Velocity

If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

A

P + ma = 0

B

P - ma = 0

C

P × ma = 0

D

$$\frac{{\text{P}}}{{{\text{ma}}}} = 0$$

A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body and S = Sum of the squares of the two semi-axes.)

A

$$\frac{{{\text{MS}}}}{3}$$

B

$$\frac{{{\text{MS}}}}{4}$$

C

$$\frac{{{\text{MS}}}}{5}$$

D

None of these

Which of the following statements regarding reluctance-start motor is incorrect ?

A

It is similar to reluctance motor

B

It is basically an induction motor and not a synchronous one

C

So far as its basic working principle is concerned, it is similar to shaded pole motor

D

the air-gap between rotor and salient poles is non- uniform

For which of the applications a reluctance motor is preferred ?

A

Electric shavers

B

Refrigerators

C

Signalling and timing devices

D

Lifts and hoists

The inherent property of a body which offers reluctance to change its state of rest or uniform motion, is

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