Question # 1

According to the special theory of relativity, time is

Choose an answer

absolute quantity

not absolute quantity

constant quantity

none of these

The photon of radio-waves has energy of about

Choose an answer

1 Me V

1 Ke v

10^-10e v

10¹⁰e v

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Choose an answer

1890

1895

1900

1905

de-Broglies hypthesis was experimentally verified by

Choose an answer

Maxwell

Compton

Einstein

Davison and Germer

At the temperature, a body emits radiation which is principally

Choose an answer

of long wavelengths in the visible region

of long wavelengths in the invisible infrared region

of short wavelength in invisible ultraviolet region

none of these

Due to relative motion of observer and the frame of reference of events, time always:

Choose an answer

Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

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

Choose an answer

NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

A black body is

Choose an answer

an ideal absorber

an ideal radiator

both of them

none of them

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Choose an answer

Max. Planck

Maxwell

Bohr

Rutherford

None of these

The value of the plank's constant 'h' is given by

Choose an answer

1.6 x 10^-19J

1.67 x 10^-27Kg

6.63 x 10³⁴Js

6.63 x 10^-34Js

The inside cavity of the black body is

Choose an answer

painted white

painted silver

blackened with soot

painted red

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

Choose an answer

decreases

first increases then decreases

increases

any one of them

The concept of direction and position are purely

Choose an answer

absolute

relative

absolute or relative

none of these

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

Choose an answer

discrete packets

continuous waves

either of them

none of these

Strictly speaking, the earth is:

Choose an answer

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)

Electromagnetic radiation or photons interact with matter in

Choose an answer

two distinct ways

three distinct ways

four distinct ways

five distinct ways

More Classes

Other Links

ECAT Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer