Question # 1

The idea of quantization of energy was proposed by:

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Einstein

Max.Planck

Maxwell

Bohr

Rutherford

A particle having mass and charge equal to that of an electron is called:

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Proton

Positron

Pion

Pi-meson

Both (C) and (D)

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

Compton studied the scattering of x-rays by loosely bound electrons from:

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NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

According to the Max plank, energy is redialed or absorbed in

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discrete packets

continuous waves

either of them

none of these

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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2.9 s

3.0 s

6.6 s

9.6 s

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

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

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

S.I. unit of planks constant is

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J-s^-1

J.s

J.s^-2

J.s²

An inertial frame is that frame in which

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a>0

a=0

a<0

none of these

The energy of a photon is represented by

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h/c²

h/T

hc²

hf/c²

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

The positron was discovered by:

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In cosmic radiation

In 1932

By Carl Anderson

All above

By direc

Compton shift refers to:

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Photon

Meson

Proton

Positron

Both (B) and (D)

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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pair production

Compton effect

photoelectric effect

relativity

Practically the quantity v/c is always:

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less than one

Equal to one

Greater then one

all of these

None of these

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

The existence of position was predicted by Dirace in

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1920

1925

1930

1928

According to the special theory of relativity

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mass and energy are same entities

mass and energy are same entities but interconverible

mass and energy are different entities but interconverible

mass and energy are different entities but non-interconveritble

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

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

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Yellow

Orange red

Dull red

White

Cherry red

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

Which of the following phenomenon proves the particle nature of light

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interference

diffraction

photoelectric effect

none of these

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

When the atomic particle are moving with velocities approaching that of light:

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Newton's laws become valid

Relativistic effects become prominent

Botha(A) and (B) are valid

Neither (A)nor (B)

There mass becomes zero.

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