More Classes
5th Class
6th Class
7th Class
8th Class
9th Class
10th Class
11th Class
12th Class
NAT I
NAT II
CSS
IQ
General Knowledge
MDCAT
ECAT
GAT General
GAT Subject
Other Links
Go to Home
Online Tests
ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers
Question # 1
The Nobel Prize on the explanation of photoelectric effect was awarded to:
Choose an answer
Max. Planck
Maxwell
Bohr
Rutherford
None of these
Previous
Skip
Next
Question # 2
0.1 kg mass will be equivalent to the energy
Choose an answer
9 x 10
15
J
5 x 10
8
J
6 x 10
16
J
9 x 10
-16
J
Previous
Skip
Next
Question # 3
the symbol to be used in relativity problems denotes:
Choose an answer
Dilated time
Proper time
Life time
Half time
None of these
Previous
Skip
Next
Question # 4
The general theory of relativity treats problems involving
Choose an answer
inertial frame of references
accelerating frame of references
both of these
none of these
Previous
Skip
Next
Question # 5
With the help of 50 K v electron microscope, a resolution of
Choose an answer
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
Previous
Skip
Next
Question # 6
An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
Choose an answer
1.66 x 10
-29
m
1.74 x 10
-10
cm
17.4 x 10
-6
m
1.74 x 10
-10
m
Previous
Skip
Next
Question # 7
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
Previous
Skip
Next
Question # 8
Which of the following is not an example of intertial frame
Choose an answer
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
Previous
Skip
Next
Question # 9
The way through which electromagnetic radiations or photons interact with matter depends upon their:
Choose an answer
Wavelength
Frequency
Energy
Temperature
All of these
Previous
Skip
Next
Question # 10
Wien's constant is measured in:
Choose an answer
Metre per kelviin
Metre kelvin
Kelvin per meter
Joules
Dynes
Previous
Skip
Next
Question # 11
The existence of position was predicted by Dirace in
Choose an answer
1920
1925
1930
1928
Previous
Skip
Next
Question # 12
The concept of direction and position are purely
Choose an answer
absolute
relative
absolute or relative
none of these
Previous
Skip
Next
Question # 13
The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
Choose an answer
pair production
Compton effect
photoelectric effect
relativity
Previous
Skip
Next
Question # 14
A black body is
Choose an answer
an ideal absorber
an ideal radiator
both of them
none of them
Previous
Skip
Next
Question # 15
The special theory of relativity treats problems invoving
Choose an answer
inertial frame of references
accelerating frame of references
both of these
none of these
Previous
Skip
Next
Question # 16
There is no way to detect:
Choose an answer
Absolute uniform motion
Accelerated motion
State rest
State of motion
None of these
Previous
Skip
Next
Question # 17
When a platinum wire is heated, it appears white at
Choose an answer
1600
°C
900
°C
1100
°C
1300
°C
Previous
Skip
Next
Question # 18
The value of the plank's constant 'h' is given by
Choose an answer
1.6 x 10
-19
J
1.67 x 10
-27
Kg
6.63 x 10
34
Js
6.63 x 10
-34
Js
Previous
Skip
Next
Question # 19
There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
Choose an answer
maximum frequency
minimum frequency
threshold frequency
all of these
Previous
Skip
Next
Question # 20
The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
Choose an answer
100 ev
10
6
e v
10
3
e v
1.0 e v
Previous
Skip
Next
Question # 21
The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
Choose an answer
2 cm/s
20 cm/s
200 cm/s
2000 cm/s
Previous
Skip
Next
Question # 22
The special theory of relativity is based on:
Choose an answer
Four postulates
Three postulates
Two postulates
One postulate
None of these
Previous
Skip
Next
Question # 23
Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
Choose an answer
Energy only
Momentum only
Mass only
Charge only
Both (A) and (B)
Previous
Skip
Next
Question # 24
A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
Choose an answer
1.66 m
1.66 x 10
-10
m
1.66 x 10
-29
cm
1.66 x 10
-29
m
Previous
Skip
Next
Question # 25
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
Previous
Skip
Next
Question # 26
The nature of radiations emitted by a hot body depends upon its:
Choose an answer
Metarial
Temperature
colour
Volume
Length
Previous
Skip
Next
Question # 27
According to the special theory of relativity, time is
Choose an answer
absolute quantity
not absolute quantity
constant quantity
none of these
Previous
Skip
Next
Question # 28
Converse of pair production is known as
Choose an answer
Compton effect
annihilation of matter
photoelectric effect
none of these
Previous
Skip
Next
Question # 29
The idea of quantization of energy was proposed by:
Choose an answer
Einstein
Max.Planck
Maxwell
Bohr
Rutherford
Previous
Skip
Next
Question # 30
Newton's law of motion do not hold in
Choose an answer
an accelerated frame of reference
an unaccelerated frame of reference
both of these
none of these
Previous
Skip
Next
Question # 31
Photoelectric effect takes place with a photon of:
Choose an answer
Very high energy
Very low energy
Low energy
High energy
None of these
Previous
Skip
Next
Back