Question # 1

The SI unit of magnetic flux is

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NmA^-2

NmA^-1

NAm^-1

Nm²A^-1

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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pair production

photoelectric effect

Compton effect

None of these

OP-AMP has the following input terminals

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one

two

three

four

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

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q = Q/4

q = Q/2

q = !

None of these

The angle of deflection of coil can be measured by the

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one method

three method

two method

none of these

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

One kilogram of different substances contain

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same number of molecules

different number of molecules

may be same or different

none of them

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

The doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

The acceleration of body executing SHM is directly proportional to

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Applied force

Amplitude

Displacement

Frictional force

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as

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waves

beat

interference

resonance

The pattern of crystalline solid is:

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One dimesional

Two dimensional

Three dimensional

Either (A) or (B)

None of these

Crests and troughs are formed in:

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Longitudinal waves

Transverse waves

Both of these

None of these

Coulomb force, when any material medium is placed between two charges

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Increases

Decreases

Remain unchanged

None of these

Tick the conservative force:

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tension in a string

Air resistance

Elastic spring force

Frictional force

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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Smaller

Lerger

Same

Much larger

None of these

Magnetic flux and flux density are related by

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Flux density = flux x area

Flux density = flux / area

Flux density = flux - area

None of these

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

Which of the following is most suitable as the core of transformer

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Soft iron

Alinco

Steel

None of these

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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2.120°A

0.212°A

21.2°A

0.14°

a

A device which converts Electrical energy into mechanical energy is called as

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Transformer

Generator

Motor

All of these

Each atom in a metal crystal vibrates about a fixed point with an amplitude that:

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Decrease the rise in temprature

Is not affected by rise in temprature

Increase with rise in temprature

Both (B) and (C)

None of these

The power dissipation in a pure inductive or capacitance circuit is

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maximum

positive

zero

none

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

Tick the one which is not polymer solid:

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Zirconia

Polythene

Nylon

Synthetic rubber

None of these

The appearance of the colour in the soap (oil) film results from:

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Dispersion

Interference

Reflection

Refraction

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

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