Question # 1

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

The maximum drag force on a falling sphere is 9.8 N, it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

In Bernoulli's theorem the relation between velocity and pressure is

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Inverse

Direct

None of the above

Both a and b

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

Laws of motion are not valid in a system which is

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inertial

non-interial

at rest

moving with uniform velocity

When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be

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changed

zero

unchanged

none of these

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

A fibre optic communication system consists of

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one major component

two major components

three major components

four major components

The light source in the transmitter can be

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semiconductor laser

LED

both of them

either of them

In an inertial frame of reference the weight of body equal to

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Force of attraction

Coulomb's force

Force of gravity

All of these

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

With the propagation of longitudinal waves through a material medium, the quantitiestransferred in the direction of propagation are:

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Energy, momentum and mass

Energy and momentum

Energy and mass

Energy

Which of the following is equal to:

joule x ohm /volt x second?

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Ampere

Volt

Watt

Tesla

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

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4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

The simplest type of rectification known as half wave rectification is obtained by

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Using a transistor

Suppressing the harmonics in A.C. voltage

Suppressing half wave of A.C. supply by using diode

Using a Coolidge

An acceleration of fog droplet falling vertically through air is

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Less than g

Greater than g

Equal to g

Zero

The dimensions of velocity gradient are same as that of

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Frequency

Time period

Angular accelerations

Accelerations

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