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MDCAT Physics Online Test MCQs With Answers
Question # 1
A bomb of mass 9 kg explodes into two pieces of mass 3 kg and 6 kg.The velocity of mass 3 kg is16 ms
-1
,K.E of mass 6 kg is
Choose an answer
96 j
192 j
384 j
768 j
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Question # 2
An automobile moves with constant speed along a circle of radius 40 m. It takes 2 μ second to complete one circle,The average speed for one complete circle is
Choose an answer
20 ms
-1
40 ms
-1
60 ms
-1
0 ms
-1
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Question # 3
The direction of Lorentz force depends on the sign of change in a magnetic field
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Negative
Positive
No charge
Both positive and negative
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Question # 4
The frequency of the incident light falling on a photosensitive metal plate is doubled the kinetic energy of the emitted photoelectrons is
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Double the earlier value
Unchanged
More than doubled
Less than doubled
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Question # 5
Even the small viscosity of the air causes a retarding force on car at high speed is
Choose an answer
Small
Large
Very large
None of these
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Question # 6
The valence band of an atom in a solid
Choose an answer
is always empty
may or may not be empty
can never be empty
none of them
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Question # 7
An alternating current is converted into direct current by a
Choose an answer
dynamo
rectifier
transformer
motor
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Question # 8
Which one of the following is not a mode of radioactivity decay
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Electron Emission
Alpha Emission
Proton Emission
Gamma Emission
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Question # 9
Viscosity of plasma at 30
o
C in Nsm
-2
Choose an answer
1.6 × 10
-3
1.595 × 10
-3
1.67 × 10
-3
1.69 × 10
-3
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Question # 10
The kinetic energy of electron (in electron volt),moving with the velocity of 4 x 10
6
m/s will be
Choose an answer
30 eV
45 eV
50 eV
60 eV
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Question # 11
Radioactive element are those which have atomic number
Choose an answer
Great than 92
Greater than 83
Greater than 82
Less than 82
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Question # 12
Which property of waves proves that light is a transverse wave?
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diffraction
interference
polarization
reflection
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Question # 13
Isotopes have same number of:
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Protons
Neutrons
Nucleons
Photons
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Question # 14
When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
Choose an answer
Decreases
Increases
No change
May increase or decrease
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Question # 15
The ratio of total energy of a harmonic osillator to its average energy with respect to position will be
Choose an answer
1 : 2
3 : 1
1 : 3
2 : 11
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Question # 16
The polarized can be achieved by using process like
Choose an answer
Coherent sources
Diffraction
Selective absorption
None of these
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Question # 17
A thermister is a
Choose an answer
Heat temperature resistor
Current sensitive resistor
Voltage sensitive resistor
None of these
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Question # 18
The increase in the speed of sound per degree Celsius rise in temperature is approximately
Choose an answer
61 m/s
-1
6.1 m/s
-1
0.61 m/s
-1
0.061 m/s
-1
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Question # 19
A converging lens in used to from an image on a screen when the upper half of the lens is covered by an opaque screen
Choose an answer
Half the image will disappear
No change either in size or in intersity
Intensity of image will increase
Intensity of the image will decrease
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Question # 20
A thin layer of oil on the surface of water looks colored due to:
Choose an answer
Diffraction of light
Reflection of light
Dispersion of light
Interference effect of light
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Question # 21
What determines half-life of a radioactive element?
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Atomic number
Mass number
Temperature
None of these
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Question # 22
The terminal velocity of for a water droplet of radius 10
-5
m is of the order of
Choose an answer
1 cm/s
1 mm/s
1 nm/s
1 μm/s
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Question # 23
As the solid state detector absorbs so less energy of the incident particle and junction become front surface. So it called the detector as
Choose an answer
Surface contact
Surface barrier
Surface dependent
None of these
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Question # 24
X-rays cause damage to
Choose an answer
Cancerous cells
Living tissues
Health cells
None of these
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Question # 25
The pipe has a length of 1m. Determine the fundamental frequency when one end of the pipe of closed. Speed of air is 340 ms
-1
Choose an answer
80 Hz
82 Hz
84 Hz
85 Hz
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Question # 26
Mathematical expression for Kirchhoff's 1st rule is
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∑R = 0
∑V = 0
∑I = 0
∑IR = 0
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Question # 27
S,I unit of magnetic flux is
Choose an answer
Weber metre
-2
Weber
Weber per metre
Weber per metre
4
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Question # 28
Ordinary light has components of vibration in
Choose an answer
One direction
Different direction
All directions
None of these
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Question # 29
CRO is used to find
Choose an answer
Phase difference between A-C voltages
Frequency and Time period of A-C voltages
Peak and rms value of alternating voltage
All of these
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Question # 30
The currents and voltages in A.C. circuits are controlled by
Choose an answer
Resistor
Capacitor
Inductor
All of them
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Question # 31
An inductor is a solenoid having the self inductance which is
Choose an answer
Small
Large
Medium
None of these
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Question # 32
Choose an answer
12 cm / sec
6 m / sec
3 cm / sec
24 cm / sec
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Question # 33
In the same medium, velocity of the wave:
Choose an answer
Goes on increasing
Remains constant
Goes on decreasing
None of these
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Question # 34
In AND gate output is 0 if:
Choose an answer
All inputs are 1
At least one input is 1
At least one input is 0
All inputs are 0
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Question # 35
After absorbing so many electrons, it becomes
Choose an answer
Stable
Unstable
Radioactive
None of these
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Question # 36
The Ultrasonics have the frequencies:
Choose an answer
In audible range
Above 20,000 Hz
Below 20Hz
None of these
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Question # 37
The atoms molecules or ions in a crystalline solids are at room temperature
Choose an answer
Motionless
Vibrate violently
Fixed
Simply vibrate
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Question # 38
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
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Question # 39
Pico is the prefix for
Choose an answer
10
-10
10
-12
10
-15
10
-18
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Question # 40
'
γ
' is the ratio for monoatomic gas is
Choose an answer
1.72
1.67
1.63
1.60
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Question # 41
Gamma-rays are electromagnetic radiations similar to
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Radio waves
Photons
X-rays
Beta rays
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