| 1 |
As the light shines on the metal surface, the electrons are ejected |
slowly
instantaneously
either of these
none of these
|
| 2 |
The value of threshold frequency for different metals is |
different
same
may be different or may be same
none of these
|
| 3 |
There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as |
maximum frequency
minimum frequency
threshold frequency
all of these
|
| 4 |
The photoelectric effect, the maximum energy of photoelectrons depends on the |
particular metal surface
frequency of incident light
both of them
none of them
|
| 5 |
When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called |
thermoionic electrons
free electrons
photoelectrons
slow electrons
|
| 6 |
The emission of electrons from a metal surface when exposed to light of suitable frequency is called the |
pair production
Compton effect
photoelectric effect
relativity
|
| 7 |
Electromagnetic radiation or photons interact with matter in |
two distinct ways
three distinct ways
four distinct ways
five distinct ways
|
| 8 |
The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by |
Max plank
Newton
Einstein
J.J. Thomson
|
| 9 |
The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as |
classical mechanics
Newtonian mechanics
quantum mechanics
statistical mechanics
|
| 10 |
The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is |
100 ev
10<sup>6</sup>e v
10<sup>3</sup>e v
1.0 e v
|
| 11 |
The photon of radio-waves has energy of about |
1 Me V
1 Ke v
10<sup>-10</sup>e v
10<sup>10</sup>e v
|
| 12 |
From the theory of relativity, momentum p of the photon is related to energy as |
p = hfc
p = hf/c
p = f(hc,f)
p = cf/h
|
| 13 |
Max plank received the Nobel Prize in physics for his discovery of energy quanta in |
1900
1906
1912
1918
|
| 14 |
In photoelectric effect the energy of ejected electrons depend on |
The frequency
The intensity
Both frequency and intensity
None of these
|
| 15 |
The value of the plank's constant 'h' is given by |
1.6 x 10<sup>-19</sup>J
1.67 x 10<sup>-27</sup>Kg
6.63 x 10<sup>34</sup>Js
6.63 x 10<sup>-34</sup>Js
|
| 16 |
A photon is considered to have |
Momentum
Energy
Wavelength
All of the above
|
| 17 |
S.I. unit of planks constant is |
J-s<sup>-1</sup>
J.s
J.s<sup>-2</sup>
J.s<sup>2</sup>
|
| 18 |
The energy of photon 'E' is proported to |
The magnetic field H
The electric field E
Both the electric and magnetic field H and E
Frequency
|
| 19 |
The energy of a photon is represented by |
h/c<sup>2</sup>
h/T
hc<sup>2</sup>
hf/c<sup>2</sup>
|
| 20 |
According to the Max plank, energy is redialed or absorbed in |
discrete packets
continuous waves
either of them
none of these
|
| 21 |
Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in |
1890
1895
1900
1905
|
| 22 |
The value of the Stephen's constant for black body radiations is given by |
5.6 x 10<sup>8</sup>Wm<sup>-2</sup>K<sup>-4</sup>
5.67 x 10<sup>-8</sup>Wm<sup>-2</sup>K<sup>-4</sup>
2.9 x 10<sup>-3</sup>mK
2.9 x 10<sup>3</sup>mK
|
| 23 |
The Stephen-Boltzmann law for the black body radiation is given by |
E = T<sup>2</sup>
E = -T<sup>2</sup>
E = T<sup>4</sup>
E = -T<sup>4</sup>
|
| 24 |
The inside cavity of the black body is |
painted white
painted silver
blackened with soot
painted red
|
| 25 |
A black body is |
an ideal absorber
an ideal radiator
both of them
none of them
|
| 26 |
When a platinum wire is heated, it appears white at |
1600<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
900<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1300<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
|
| 27 |
When platinum wire is heated, it appears cherry red at |
1600<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
900<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1300<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
|
| 28 |
When a platinum wire is heated, it appears yellow at |
1600°C
900°C
1100°C
1300°C
|
| 29 |
When a platinum wire is heated, it appears orange red at |
500<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
900<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
1300<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
|
| 30 |
When a platinum wire is heated, it appears dull red at about |
500°C
900°C
1100°C
1300°C
|
.gif)
Home
News
Colleges
Courses
Admission
Lectures
Online Test
Past Papers
Date Sheets
Results
Study Abroad
Jobs
Tutors
More
Apps
