ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

00:00
Question # 1

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

Question # 2

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 3

According to the special theory of relativity, time is

Question # 4

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 5

Intensity of light determines the:

Question # 6

As the light shines on the metal surface, the electrons are ejected

Question # 7

When a platinum wire is heated, it appears orange red at

Question # 8

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 9

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

Question # 10

At the temperature, a body emits radiation which is principally

Question # 11

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

Question # 12

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 13

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

Question # 14

According to the special theory of relativity

Question # 15

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
2 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
3 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
4 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
5 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
6 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
7 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
8 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
9 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
10 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency

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    hasnain

    30 May 2018

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