Question # 1

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

The magnitude of motional emf is given by

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Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

Very weak magnetic field produced by brain can be detected by

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MRI

CAT scans

Squid

CRO

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

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

For workers in nuclear facilities is, a weekly does of is normally considered safe

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1.0 msv

5.0 msv

2.0 msv

3.0 msv

Capacitance of a capacitor does not depend upon.

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Distance between plates

Area of plates

Electric field between plates

Medium between plates

The algebraic sum of potential change in a closed circuit is zero.

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Kirchhoff's 1st rule

Kirchhoff 2^nd rule

Krichoff's 3^rd rule

Kirchhoff 4^th rule

Self inductance of a long solenoid is given by

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None of the above

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

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