Question # 1

As the current flow through the wire:

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It generates heat in the wire

It produces sound in the wire

Resistance of the wire decreases

Voltage across the ends is increased

None of these

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

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Increases

Decreases

Remains same

None of these

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

The magnitude of induced emf depends upon the

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

The decrease in velocity per unit time is called

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deceleration

acceleration

uniform acceleration

variable acceleration

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?

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3 x 10²⁰

3 x 10¹⁰

6 x 10²⁰

6 x 10¹⁰

If we increase the length of a simple pendulum four times, its time period will become

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2 times

3 times

4 times

6 times

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

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60 W bulb

100 W bulb

Both equally

None of these

Electric intensity at a place due to a charged conductor is a

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Scalar quantity

Vector quantity

Semi vector and semi scalar

Dimensionless quantity

Both A and D are true

A magnetic force on an electron travelling with 10⁸ms^-1parallel to a field of strength 1 Wb m^-2is

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Zero

10⁵m

10^-10N

10⁸N

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

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Clausius statement of second law

Kelvin'sstatement of second law

Clausius statement of first law

Kelvin's statement of first law

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

The smallest three dimensional basic structure in a crystalline solid is called

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lattice point

crystal lattice

cubic crystal

unit cell

The induced current in the loop can be increased by:

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Using a strong magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All of above

None of these

Compton studied the scattering of x-rays by loosely bound electrons from:

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NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

The volume of universal gas constant R is:

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8.314 J/K mole K

8314 J/K mole K

8.314 J/mole K

None of these

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

The charged nucleus of an atom itself spins its magnetic field

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equal to the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of these

The magnetic field outside the solenoid due to current is

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strong

zero

weak

uniform

The analysis of fluid motion becomes simplified by using

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law of conservation

law of conservation of energy

both of them

none of them

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

If the objects of different masses move with the same velocity, then it is more difficult to stop the

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lighter of the two

massive of the two

any one of them

both of them

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

The galvanometer can be made sensitive if the value of the factor C/BAN is

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constant

small

large

none of these

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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3/5 ohm

2 ohm

6/5 ohm

3 ohm

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