Question # 1

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

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-10 N

+10 N

+20 N

-20 N

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

The positron was discovered by:

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In cosmic radiation

In 1932

By Carl Anderson

All above

By direc

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

The instantaneous acceleration of a body moving with constant speed in a circle:

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Remains constant

Is called centripetal acceleration

Tangential acceleration

None of these

Current varies with voltage

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Inversely

as square root

Directly

None of these

A process is a reversible process, if the entropy of the system

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increases

decreases

remains constant

none of them

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

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

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6 ohm

4 ohm

zero ohm

1.33 ohm

A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is:

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Radius of the circle

Twice the radius

Thrice the radius

None of these

When a conductoris moved across a magnetic field:

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Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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larger

shorter

equal

none of these

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Neither AC nor DC

In order to have a constant current through wire, the potential difference across its end should:

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Be zero

Be maintained constant

Goes on increasing

Go on decreasing

Both (A) and (B)

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

none of them

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

The gavanometer constant of a moving coil galvanometer is given by

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K=BAN/C

K=BN/CA

K=NAC/B

K=C/BAN

When either L or C is increased, the resonant frequency of the RLC series circuit

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Increases

Decreases

Remains the same

Becomes zero

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

The velocity of a projectile is maximum

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at the point of projection

just before striking the ground

at none of them

at both of them

With increase of temperature, the viscosity of liquid and gases

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Increases for both

Decreases for both

Increases for liquids and decreases for gases

Decreases for liquids and increases for gases

The domains are of macroscopic size of the order of

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centimeters

meters

millimeters

nanomneters

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

The work done by a force, keeping an object in circular motion with constant speed is:

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Zero J

1 J

0.1 J

0.01 J

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

Davision and Germer performed experiment to verify

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de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

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