Question # 1

In case of p-n junction diode at high value of reverse bias the current rises sharply The value of reverse bias is known as

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Cut off voltage

Zener voltage

Inverse voltage

Critical voltage

If two non-zero vector ̅A̅ and ̅B are parallel to each other, then ̅A̅, ̅B is equal to

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Zero

AB

A + B

A - B

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

In an AC circuit a resistance of R ohm i connected in series with an inductance L if phase angle between voltage and current be 45^o the value of inductive reactance will be

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R/4

R/2

R

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly Proportional to its temperature

Inversely proportional to its temperature

The velocity v of a particle at time t is given by:

v = at + b / t + c

The dimensional formula of a,b and c care respectively:

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L² ; T and LT²

LT² ; LT and L

LT^-2; L and T

L;LT and T^-2

The velocity of a particle at an instant is 10 m/s and after 5 s the velocity of the particle is 20 m/s.The velocity 3s before in m/s is:

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8

4

6

7

To explain his theory Bohr used

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Conservation of linear momentum

Conservation of angular momentum

Conservation of quantum frequency

Conservation of energy

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