Question # 1

Fog droplets are suspended in air when their weight is balanced by:

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Force of gravity

Upward trust due to air

Surface tension

None of these

The body oscillates due to ______ accelerates and overshoots the rest position due to _______

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Applied force, Inertia

Restoring force, Friction

Frictional force, Inertia

Restoring force, Inertia

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

At absolute temperature, the kinetic energy of the molecules

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Becomes zero

Becomes maximum

Becomes minimum

Remain constant

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

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inverting input

non-inverting input

any one of the input terminal

none of them

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

The S.I unit of frequency is

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Vibrations s^-2

Ms^-1

Hertz

s^-1

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

When a conductoris moved across a magnetic field:

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Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

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negative charges

positive charges

protons

electrons

Which one is related to angular motion:

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Moment of a force

Moment of inertia

Moment of momentum

None of these

If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm²will be

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1 cm

2 cm

8 cm

None

When an oscillatory motion repeats itself, then this type of motion is called

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vibratory motion

constant motion

fixed motion

periodic motion

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

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5 cm

10 cm

20 cm

25 cm

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5μF

10μF

3μF

6μF

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

The peak voltage in a 220 volt A.C. supply is nearly

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220 volt

253 volt

.311 volt

440 volt

A ball is dropped vertically down and it takes time t to reach the ground. At time t/2

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The ball had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

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Peak value

RMS value

Instantaneous value

Peak-to-peak value

Both (A) and (C0

The linear momentum of the body is defined as

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p=ma

p=1/2ma

p=mv

p=1/2mv

If the absolute uncertainty of an instrument is 0.0a1 cm, then its least count will be :

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0.005 cm

0.01 cm

0.02 cm

0.001 cm

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

Distance covered by a freely failing body n the first second of its motion will be:

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4.9 m

9.8 m

19.6 m

29.4 m

The shortest distance between two points directed from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

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Force

Energy

work

impulse

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

When the speed of a body in a fluid increases then the drag force

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decreases

becomes zero

increases

non of them

Which instrument is expensive and difficult to use?

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Voltmeter

Potentiometer

CRO

Both A and C

Both A and B

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