Question # 1

Some charge is being given to a conductor. Then its potential

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Is maximum at surface

Is maximum at centre

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

The induced current in the loop can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both (A) and (B)

A certain force gives an acceleration of 2 m/sec2 to a body if mass 5 kg. The same force would give a 29 kg object an acceleration of:

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0.5 m/sec2

5 m/sec2

1.5 m/sec2

9.8 m/sec2

An vector of 10 N makes an angle of 45° with x-axis. Angle between its rectangular components with be:

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45°

90°

135°

Zero

The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is

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Much more

Very small

No amount at all

None of these

Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to

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Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

When two protons are brought are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

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-20°C

6.67°C

5°C

0°C

Specific heat at constant pressure is greater than the specific heat at constant volume because

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Heat is used up to increase temperature at constant pressure

Heat is used by gas for expansions purposes at constant pressure

Heat is use dup to increase internal energy

The above statement is invalid

At resonance, the phase angle for RLC series resonance circuit equals

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0°

90°

180°

270°

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

A hole is drilled half-way to the centre of earth. A body weighs 200 N on surface of earth. How much will it weigh at bottom of the hole

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100 N

150 N

200 N

250 N

A body moving in a circular path with constant speed has

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Constant acceleration

Constant retardation

Variable acceleration

Variable speed and constant velocity

8.233 m, 2:105 m and 1.05 cm are the length, breadth and thickness respectively. Find volume of the sheet correct upto appropriate significant digits

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8.25 × 10^-3 m³

7.15 × 10^-2 m³

7.85 × 10^-2 m³

None of these

In petrol engine, the first stroke is the

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Power stroke

In take stroke

Exhaust stroke

None of these

The symbol that is used to represent rotational inertia or moment of inertia is

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W

I

R

M

The volume of liquid flowing per second out of an orifice at the bottom of a tank does not depend upon

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The area of the orifice

The height of liquid above the orifice

The density of liquid

Both A and C

The subtances which break just after the elastic limit is reached are known as:

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Ductile

Brittle

Malleable

Hard

Soft

Angular acceleration is a

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Scalar quanity

Variable quantity

Vector quantity

None of these

A body of mass 5 kg, initially at rest is moved by a force of 2 N on smooth horizontal surface the work done by the force in 10 s is

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20 j

30 j

40 j

60 j

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

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