Question # 1

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

The reciprocal of decay construct lamda of a radioactive element is.

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Half life

Mean life

Curie

total life

The 1^st Bohr atom in the hydrogen atom has radius

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3.56 x 10^-10 m

0.053 x 10^-11 m

0.53 x 10^-11 m

5.30 x 10^-11 m

if time constant in RC series circuit is small, then capacitor is charged or discharged.

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Slowly

Rapidly

At constant rate

Intermittently

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The number of neutrons in Li are

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2

3

4

7

Rectification is the process of converting.

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D.C. into A.C.

A.C. in to D.C.

Low signal to high

High signal to low

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

If both the length and radius of the rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

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