Question # 1

The special theory of relativity was presented in 1905 by

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Young

Planck

Schrodinger

Einstein

The base unit of temperature in SI is

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Fahrenheit

Celsius

Kelvin

Rnakine

In a fission reactor which particle causes a uranium -235 nucleus to split.

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Alpha particle

Gama ray

Neutron

Proton

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

As the mass number increases, the binding energy per nucleon in a nucleus

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Increases

Decreases

Remain constant

Varies in a way that depends upon A

Which quantity has different units from the other three.

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Density x volume x velocity

Rate of change of momentum

Young's modulus x area

Weight

The X-rays coming from a X-rays tube

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Is monochromatic

Has all wavelengths smaller than a certain maximum wavelength

Has all wavelengths greater than a certain maximum wavelength

has all wavelengths minimum than a certain maximum wavelength

The energy equivalent of 1 kg of matter a

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10^-15 J

1 J

10¹²J

10¹⁷ J

The process due to which current flows only during alternate half cycle is known as.

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Filtration

saturation

Half wave rectification

Full wave rectification

The energy of neutrons obtained during a fission reaction is.

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0.1 MeV

1 KeV

1 MeV

Zero

Light waves can be polarized because they

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have short wavelength

Have high frequency

Can be reflected

Are transverse

If two bodes are under a collision that is not perfectly elastic then.

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K.E. is conserved but momentum is not

Momentum is conserved but K.E. is not

Neither K.E. nor momentum is conserved

Both K.E. and momentum are conserved

Thermodynamics deals with

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Isolated systems

The interactions among various parts of the system

The microscopic behavior of a system

The interactions between system and surrounding

Light entering glass will not suffer change in

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Wavelength

Direction

Velocity

Frequency

For the normal operation of transistor the emitter base junction is always.

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Zero biased

Reverse biased

Forward bised

Both a and b

The advantage of electron tube over semiconductor is.

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_{its efficiency}

its unlimited type

Its low consumption power

That it takes no warming up time

The electric field intensity of a point charge varies.

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Directly as the square of the distance from the charge

Directly as the square of the charge

Inversely as teh distance from the charge.

Inversely as the square of the distance from the charge

The charge on an Isolated conductor always lies.

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Within the conductor

At the centre of the conductor

On the surface of the conductor

Outside the surface of the conductor

When Electric current flows through the wire it increases.

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P.E of the atoms

K.E. of the atomss

Atomic size

Number of protons

The scientist who first noted that a compass needle was deflected when in the neighborhood of a current carrying wire was.

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Joseph Henry

Hans Christian Oersted

Michael Faraday

J.J. Thomson

Distance covered by a freely failing body in 2 s will be.

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19.6 m

4.m

39.2 m

44.1 m

A capacitor of capacitance F micro is fully charged from a 20 V d.c supply what is the energy delivered by 20 V supply.

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2 mJ

10 m j

20 mJ

25 mj

When the lift is moving upward with an acceleration then weight of the object will be.

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w = ma

w - ma

w

2 w

Planets move around the sun due to.

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Centrifugal force

Centripetal force

Gravitational pull between them

Frictional force between them

The specific heat of liquid

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Decreases with temperature

Increases with temperature

Remains constant with change in temperature

Increases with pressure

Which type of image is produced by the converging lens of human eye if it views a distant object.

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminshed

Virtual, inverted, magnified

The value of open loop gain for the amplifier is

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zero

very low

very high

of an intermediate vaue

The change in wavelength of an X-ray when scattered from an electron is called.

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Compton shift

Doppler shift

Stefan's law

Fraunhofer lines

A lens whose thickness is small as compared to focal length is a

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Concave lens

Double concave lens

Convex lens

Plano concave lens

What are isotopes.

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Atoms of the same element with different numbers of neutrons.

Atoms of the same element with different numbers of protons.

Atoms which are radioactive

Atoms which have gained or lost an electron

The diffraction of light was discovered by

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Newton

Young

Francesco Grimaldi

Hertz

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