Question # 1

For a n-p-n transistor, the conventional current equation can be written as

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I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

Faraday's law of electromagnetic induction has been used in the construction of:

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Galvanometer

Voltmeter

Electric motor

Electric genrator

Commutator

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 most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

The space around the earth within which it expects a force of attraction on other bodies is known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

Astrophysics is a branch of physics, which deals with

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Sub-atomic

Stars and galaxies

Light and sound

Music

The maximum distance of body from mean position when body is executing SHM is called

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Time period

Displacement

Amplitude

Frequency

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

A field in which the work done in moving a body along closed path is zero is called

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Nuclear Field

Conservative field

Gravitational field

Non-conservative field

The direction of angular displacement is determined by using

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Heat-to-tail rule

Fleming left hand rule

Right angle rule

None of these

Which Phenomenon proves that nature of light is transverse

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Interference

Diffraction

Scattering

None

A usual way to obtain a plane wave is to place point source of light at the focus of a

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concave lens

convex lens

both of them

either of them

A cube of metal is given a positive charge Q.For the above system,which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric field varies within the cube

The total magnification of a combination of two lenses having individual magnification M1 and M2 is

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M₁+ M₂

M₁M₂

M₁- M₂

M₁/ M₂

Half-life of radon gas is:

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1620 years

3.8 days

7 days

11 days

Two forces are acting together on an object.The magnitude of their resultant is minimum when the angle between the force is:

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0°

60°

120°

180°

When satellite is moving in a circle, it has an aceleration

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mV²/r

ωr/V

V²/r

ωV/r

Work energy principle is the work done on the body is equal to

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Change in power

Change in K.E.

Change in acceleration

Change in angular velocity

The time constant is the time required to deposit the equilibrium charge

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63 times

36 times

0.63 times

0.36 times

Young's modulus for concrete is

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10

15

25

30

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