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MDCAT Physics Online Test MCQs With Answers
Question # 1
Current is measured in
Choose an answer
volts
watt
ohm
ampere
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Question # 2
When the temperature of source and sink of heat engine become equal than efficiency of heat engine will
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Maximum
Minimum
Negative
Zero
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Question # 3
The escape velocity of Saturn in Kms
-1
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30.0
35.04
37.0
37.4
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Question # 4
The bridge circuit of full wave rectification uses
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one diode
two diodes
three diodes
four diodes
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Question # 5
The special theory of relativity is bases d on:
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Four postulates
Three postulates
Two postulates
One postulate
None of these
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Question # 6
The gamma camera is designed to detect
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α-radiation
β-radiation
γ-radiation
X-rays
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Question # 7
Nuclear forces are
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Short range forces
Long range forces
Independent of distances
None of these
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Question # 8
The wave propagates in space by the motion of the
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Particles
Wavefronts
Wavelength
None of these
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Question # 9
As the temperature of a hot body rises, the proportion of:
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Shorter wavelength radiation increases
Longer wavelength radiation decreases
Both (A) and (B)
Longer wavelength radiation increases
Both (A) and (C)
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Question # 10
The energy of the γ-rays more than 1.02 MeV the dominant process is
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Compton effect
Pair production
Photo electric effect
None of these
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Question # 11
Since density is proportional to the pressure, so the speed of sound by the variation in the pressure of the gas is
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Affected
Not affected
Slightly affected
None of these
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Question # 12
During
γ-decay
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A changes by 4 while Z changes by 2
A remains constant while Z changing by
+
1
A and Z both change by 2
A and Z both remain unchanged
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Question # 13
Theγ-rays radiography are used in
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Internal imaging of the brain
Size and location of tumor
Cavities in easting for pipes
All of them
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Question # 14
High or 1 can be any voltage between:
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0 to 0.8 V
1.5 to 2.0 V
3.5 to 5 V
2 to 5 V
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Question # 15
The acceleration of a body executing SHM at its mean position is
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Minimum
Maximum
Zero
None of these
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Question # 16
A body is dropped from a tower reaches the earth surface in 4 sec where g is 10 m/s
2
the height of tower is
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80 m
20 m
160 m
40 m
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Question # 17
The effect of loading the prongs of a tuning fork with wax is to:
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Increase the frequency
Decrease the frequency
Maintain the original frequency
All of these
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Question # 18
The relation for the stationary waves in a stretched string is where n = 1, 2, ,3, ....
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Question # 19
The electric and magnetic forces were unified to get an electromagnetic force by
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Faraday
Maxwell
Ampere
A and B
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Question # 20
Dimensions of power are
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ML
2
T
-3
ML
2
T
-2
ML
2
T
-1
MLT
-2
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Question # 21
One mole of (NH
4
)
2
HOP
4 contains _ moles of hydrogen atoms:
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1
5
6
9
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Question # 22
The medium in which speed of light is the same in all directions is called:
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Homogeneous
Heterogeneous
Non-homogeneous
Free space
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Question # 23
Speed of light in vacuum depends upon:
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Frequency
Wavelength
Amplitude
None of above
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Question # 24
Newtons second law of motion is also called
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Law of inertia
Law of acceleration
Law of force
None of these
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Question # 25
Computerized axial tomography is
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BAT-scanner
CAT-scanner
RAT-scanner
None of these
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Question # 26
The work done in an adiabatic change in a particular gas depends upon only
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Change in volume
Change in temperature
Change in pressure
Change in specific heat
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Question # 27
The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object
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Smaller
Larger
Very large
None of these
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Question # 28
When X-rays pass through air they
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Produce light track in the air
Ionize the gas
Produce fumes in air
Accelerate gas atoms
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Question # 29
The substances which break just after the elastic limit is reached, are known as
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brittle substances
ductile substances
plastic substances
elastic substances
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Question # 30
A diffraction grating of length 2cm has 4000 lines The grating element is
Choose an answer
0.5 x 10
-2
cm
5 x 10
4
5 x 10
-4
0.5 x 10
-4
cm
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Question # 31
Average radiation doses from nuclear power stations for a year is
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10 m Sv
20 m Sv
30 m Sv
4 m Sv
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Question # 32
A solenoid is a cylindrical, long and tightly wound coil of wire. When a current pass through it behaves like a
Choose an answer
Source of emf
Magnet
Electromagnet
None of these
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Question # 33
Bohr's atomic model gained acceptance above all other models because it:
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Is based on quantum hypothesis
Explained the constitution of atom
Assumed continuous radiation of energy by orbiting electrons
Explained hydrogen spectrum
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Question # 34
Ultrasonic waves are particularly useful for
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Object detection in air
Object detection in water
Both
None of these
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Question # 35
The horizontal velocity component in projectile motion is
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Zero
Constant
Maximum
None of these
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Question # 36
Stationary waves only of discrete set of frequencies are set up in a medium this fact is called
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Harmonics
Overtones
Quantization of frequencies
Superposition of frequencies
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Question # 37
A nucleus emit
γ
radiation then
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Z increases
A increases
Both A and Z increases
Both remain same
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Question # 38
Fringe spacing in YDS experiment will be maximum if we use:
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Red light
Green light
Violet light
Blue light
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Question # 39
A cannot engine takes 300 calories of heat at 500 k and rejects 150 calories of heat to the sink.The temperature of sink is
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125 k
250 k
750 k
1000 k
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Question # 40
The displacement time graph for the two particles A and B are straight lines inclined at 60° and 30° with the same axis.The ratio of the velocity of B is
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1:1
2:1
3:1
4:1
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Question # 41
The velocity of falling raindrops attains limited value because of
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Up thrust of air
Air currents of the earth atmosphere
Surface tension effect
Viscous force exerted by air
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