Question # 1

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

Most OP-AMP operates with

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+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

The power of an electric generating station is expressed in:

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Kilo Jule

Kilowatt-hour

Kilo watt

Watt

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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Energy only

Momentum only

Mass only

Charge only

Both (A) and (B)

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

When transistors are used in digital circuits they usually operate in the

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Active region

Breakdown region

Saturation and cutoff regions

Linear region

The amplifier which us used to perform mathematical operations electronically is known as

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calculator

OP-AMP

computer

any one of them

The displacement coincides with the path of the motion when a body moves is a

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curved line

straight line

may be curved or straight

none of them

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

The ratio of the numerical values of the average velocity and average speed of a body is always.

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Unity

Unity or less

Unity or more

Less than unity

Light is a type of energy which produces sensation of

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Sound

Feeling

Vision

None of these

Single mode step index fibre has feature/s like

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Very thin core

5 (μm) miameter

Relatively large cladding

All of these

When temperature increases, frequency of organ pipe:

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Decreases

Remains the same

Increases

Becomes zero

A charge is placed at the centre of cube,the flux emitted through its one face is

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q/ε_∘

q/2ε_∘

q/6ε_∘

q/12ε_∘

The typical speed of light, radio-waves, X-rays microwaves is

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28,000,0000 ms^-1

29,000,0000 ms^-1

30,000,0000 ms^-1

None of these

In YDS experiment, the condition for constructive interference of two coherent waves is that the path difference should be

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Integral multiple ofλ/2

Integral multiple ofλ

Even integral multiple ofλ/2

Both A and C

Who gave the corpuscular nature of light

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Einstein

Newton

Maxwell

Thomas young

The sink in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

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