Question # 1

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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decreases

first increases then decreases

increases

any one of them

When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

The interior of a hollow charged metal sphere is a region which:

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Contain some magnitude of electric field

Is full of electric field lines

Is field-free region

Either (A) or (B)

None of these

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

Which waves are used in sonography?

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Microwaves

Infra red waved

Sound waves

Ultrasonic waves

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

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Equal to

Greater than

Smaller than

None of these

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

The concept of field theory was put forward by

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Franklin

Kepler

Oersted

Michael Faraday

The work done by the system on its environment is considered as

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positive

negative

zero

any one of them

The molecules or ions in a crystalline solid are

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static

not static

randomly moving

all of them

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

A tritium and alpha particle enter the magnetic field with same kinetic energy, what will be the ratio of their radii?

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3:4

√3: 1

√3: 4

√3:√2

An image formed by a concave lens is always

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Virtual

Real

Inverted

None of these

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3 N.The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

A lift is moving downwards at a very high constant speed. A passenger present inside the lift standing on a weighing machine would notice that his weight

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is shown as zero on the scale

becomes zero

remains constant at a value less than this real weight

remains the same as his real weight

The capacity of a parallel plat capacitor depends on the

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Type of metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

Si system is based upon ______ kind of units

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One

Two

Three

Four

Multimode graded index fibre core has diameter of

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40-200 μm

50-1000 μm

50-150 μm

50-300 μm

The viscosity of liquid is due to

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Adhesive force

Cohesive force

Gravitational force

Diffusion

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