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
PPSC Physics Chapter 7 Modern Physics MCQs With Answers
Question # 1
Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.
Choose an answer
20 minutes
40 minutes
80 minutes
120 minutes
Previous
Skip
Next
Question # 2
Ebers-Moll model describes the working of a
Choose an answer
BJT
FET
MOSFET
UJT
Previous
Skip
Next
Question # 3
Which type of amplifier causes minimum drain of power supply.
Choose an answer
Class -A
Class -B
Class-C
Class -AB
Previous
Skip
Next
Question # 4
The constant lamda is called the.
Choose an answer
Decay constant
Gas constant
Planck's constant
Dose constant
Previous
Skip
Next
Question # 5
Bohr's atomic model assumes
Choose an answer
Nucleus is of infinite mass and is at rest
electron in a quantized orbit will not radiate energy
Mass of electron remains the same
All of the above
Previous
Skip
Next
Question # 6
The phenomenon in which a photon of frequency 'f' is scattered by an electron and the scattered photon has frequency f <f is known as.
Choose an answer
Pair production
Pair annihilations
Photoelectric effect
Compton's effect
Previous
Skip
Next
Question # 7
Mosley's law establishes the X-rays fluorescence of target element with is.
Choose an answer
Atomic weight
Atomic number
Density
Lattice constant
Previous
Skip
Next
Question # 8
The reciprocal of decay constant lamda of a radioactive element is.
Choose an answer
Half life
Mean life
Total life
Curie
Previous
Skip
Next
Question # 9
Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is.
Choose an answer
longer that that of visible light
Smaller than that of visible light
Same as that of visible light
Unpredictable
Previous
Skip
Next
Question # 10
X-rays are not used in RADARs because
Choose an answer
They are not reflected by the target
they are not completely absorbed by air
They damage the target
They are reflected by the target
Previous
Skip
Next
Question # 11
The photons emitted in inner shell transition are.
Choose an answer
Alpha particle
Beta particle
Gama particle
Characteristic X-rays
Previous
Skip
Next
Question # 12
Which of the following properties is not exhibited by X-rays.
Choose an answer
Interference
Diffraction
Polarization
Deflection of electric field
Previous
Skip
Next
Question # 13
What is the energy equivalent to amu in Me V
Choose an answer
0.931 MeV
9.31 MeV
93.1 MeV
931 MeV
Previous
Skip
Next
Question # 14
Nuclear force exists between
Choose an answer
Proton proton
Neutron -neutron
neutron -proton
All of these
Previous
Skip
Next
Question # 15
A spectroscope sorts out
Choose an answer
Atoms
Molecules
Elements
Isotopes
Previous
Skip
Next
Question # 16
Transistor are made from
Choose an answer
Plastics
Metals
Insulators
Doped semiconductors
Previous
Skip
Next
Question # 17
In electromagnetic spectrum X-rays are next to.
Choose an answer
Water waves
Radio waves
ultraviolet waves
Infrared waves
Previous
Skip
Next
Question # 18
The gama rays have
Choose an answer
Thin tracks
Thick tracks
No definite tracks
Continuous tracks
Previous
Skip
Next
Question # 19
How much large is the proton mass than the electron mass.
Choose an answer
1536
1636
1736
1836
Previous
Skip
Next
Question # 20
The wavelength of Lyman series for hydrogen spectrum lies in the.
Choose an answer
Visible region
Ultraviolet region
Infrared region
Far infrared region
Previous
Skip
Next
Question # 21
In CC configuration voltage gain is.
Choose an answer
Less than one
More than one
One
Zero
Previous
Skip
Next
Back