Question # 1

Which one of the following could be the frequency of ultraviolet radiation?

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1.0 x 10⁶Hz

1.0 x 10⁹Hz

1.0 x 10¹²Hz

1.0 x 10¹⁵Hz

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by

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F =q(v/B)

F=q²(v x B)

F=q(v x B)

F= vx B

In a transistor, if the central region is p-type then this type of transistor is known as

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p-n-p transistor

n-p-n transistor

either of these

none of these

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

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

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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3525.0 volts

35.35 volts

353.5 volts

3.535 volts

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

The unit of magnetic flux is

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Weber-m²

Weber-m³

Henry

Weber

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

An optical fiber carries data in the form

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Lights signals

Sound signals

A wave

A particle

Two sources of light are said to be coherent when the waves produced by them have

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Equal wavelength

Equal amplitude

Equal wavelength and constant phase difference

Amplitude and wavelength are same

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increase

Remains constant

First increases and then decreases

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

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20%

80%

50%

None of these

Fluids resist force this property is called

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Stiffness

Strength

Ductility

Elasticity

In petrol engine, the first stroke is the

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Power stroke

In take stroke

Exhaust stroke

None of these

In reversible process there is a reversed change in

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Working substance

Thermal

Mechanical

B and C

In which of the optical fibres, the propagation of light signal is through continuous refraction?

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multi-mode step index fibre

multi-mode graded index fibre

both of them

none of them

In an isothermal process, the change is internal energy is

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Maximum

Zero

Very small

None of these

The energy expended when a force of one newton moves an object one meter in the direction of force is called

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1 calorie

1 Joule

1 KWh

1 electron Volt

The test charge is always a unit

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positive charge

negative charge

both

none of these

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