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MDCAT Physics Online Test MCQs With Answers
Question # 1
In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie
Choose an answer
Ultraviolet
Infra red
Visible
X-ray
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Question # 2
In petrol engine, the second stroke is the
Choose an answer
Compression
In take
Power
None of these
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Question # 3
A student finds the time period of a simple pendulum. Then he plot a graph between length and time period. The graph is a
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Straight line
Parabola
Ellipse
Circle
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Question # 4
Energy can be stored in
Choose an answer
Magnetic field of a capacitor
Electric field of a capacitor
Dielectric
None of these
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Question # 5
A forward biased p-n junction offers
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Zero resistance
Very high resistance
Few ohm resistance
None
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Question # 6
Polaroids are used in
Choose an answer
Sun glasses
The production and analysis of plane polarized light
Stereoscopic motion picture
All of these
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Question # 7
The electrons are emitted from the metal when light falls on it is of
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High frequency
Low frequency
Suitable frequency
None of these
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Question # 8
Fractional error in a measured quantity is determined by
Choose an answer
Measured value / Absolute error
Absolute error / Measured value
Measured value + Absolute error
Measured value - Absolute error
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Question # 9
Current through a metallic conductor is directly proportional to the potential difference applied across its ends, this is
Choose an answer
Ohm's law
Gauss's law
Faraday's law
none of them
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Question # 10
Thermal radiations are a type of:
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Mechanical waves
Electromagnetic waves
Alpha rays
Electrons
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Question # 11
The resistance of 20 cm long wire is 10 Ω when the length is changed to 40 cm.The new resistance is
Choose an answer
10 Ω
20 Ω
30 Ω
40 Ω
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Question # 12
A phenomenon in which a low energy photon interact with metal and usually absorbed with the emission of an electron is known as
Choose an answer
Compton effect
Pair production
Photoelectric effect
None of these
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Question # 13
Split rings are used in the device
Choose an answer
A.C. generator
A.C. motor
D.C. motor
All of them
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Question # 14
Semiconductor materials have the conductivities generally lies between
Choose an answer
10
-5
to 10
-6
(Ωm)
-1
10
-6
to 10
-4
(Ωm)
-1
10
-7
to 10
-3
(Ωm)
-1
None of these
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Question # 15
A choke coil is used as a resistance in
Choose an answer
d.c.circuit
a.c.circuit
d.c potentiometer circuit
Wheatstone bridge
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Question # 16
Light emitting diode work when it is
Choose an answer
Forward biases
Reverse biased
Both
None of these
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Question # 17
If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope
Choose an answer
Decreases
Increases
Gets halved
Remains unchanged
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Question # 18
A frame of reference is any coordinate system to which measurements are taken as
Choose an answer
Correctly
Specifically
Relative
None of these
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Question # 19
Pressure exerted by a gas on the walls of its container is due to
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Adhesion between the gas molecules and the container
Cohesion between the gas molecules and the container
Collision between the gas molecules and the container
Surface tension of the gas
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Question # 20
In A.C. choke, the power consumption is
Choose an answer
Small
Very small
Extremely small
None of these
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Question # 21
Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
Choose an answer
photo diode
light emitting diode
photo voltaic cell
none of them
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Question # 22
The appearance of colours in the shape (or oil) film results from:
Choose an answer
Dispersion
Interference
Reflection
Refraction
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Question # 23
The charge moving perpendicular to the magnetic field 'B' with a certain velocity 'v' experiences
Choose an answer
No Force
Maximum Force
Minimum Force
None of these
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Question # 24
The Weber is unit of measure of:
Choose an answer
Conductance
Electric current
Magnetic flux
Electric flux
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Question # 25
In YDS experiment, condition for constructive interference is that path difference is equal to
Choose an answer
n
λ
m
λ
(n + 1/2)
λ
(m + 1/2)
λ
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Question # 26
Thyroid cancer is cured by
Choose an answer
cesium-137
strontium-90
carbon-14
cobalt-60
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Question # 27
RBE of Neutrons and protons below 10 MeV is
Choose an answer
0.5 RBE
10.0 RBE
0.8 RBE
1.7 RBE
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Question # 28
Rate of change of momentum is called
Choose an answer
impulse
force
torque
momentum
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Question # 29
If frequency of applied signal and time base generator are same the output signal will be
Choose an answer
Stationary
Over lapping
Both A and B
None of these
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Question # 30
In photoelectric effect the energy of ejected electron depends on
Choose an answer
The frequency
The intensity
Both frequency and intensity
None of these
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Question # 31
The torque produced in d.c. motor vanishes due to change of direction after each half revolution due to
Choose an answer
Reversed torque
Creates jerk
Both
None of these
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Question # 32
Average value of A.C over a cycle is
Choose an answer
V
o
2V
o
V
o
sinθ
Zero
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Question # 33
The temperature of the surface of sun is about
Choose an answer
5 million degree Celsius
10 million degree Celsius
15 million degree Celsius
20 million degree Celsius
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Question # 34
The electromotive force is closely related to
Choose an answer
magnetic flux density
potential difference
electric field intensity
inductance
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Question # 35
Wavelength of X-rays falling at glace angle 30
° on crystal with atomic spacing 2 x 10
-9
m for the first order diffraction is
Choose an answer
4 x 10
-6
m
2 x 10
-10
m
0.2 x 10
-10
m
20 x 10
-10
m
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Question # 36
Polythene,polystyrene and nylon are example of
Choose an answer
Polymeric solids
Crystalline solids
Glassy solids
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Question # 37
The energy stored in an inductor is
Choose an answer
Electrostatic
Electromagnetic
Magnetic
Mechanical
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Question # 38
The nature of capacity of electrostatic capacitor depends on
Choose an answer
Shape
Size
Thickness of plates
Area
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Question # 39
A sodium surface is illuminated with light of wavelength 300 nm. The work function of sodium metal is 2.46 eV. Find the electrons of maximum energy which
Choose an answer
3.12 eV
4.14 eV
4.63 eV
5.23 eV
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Question # 40
The temperature at which the average K.E of a molecule of a gas will be the same as that of an electron accelerated through 1 volt will be
Choose an answer
7700 K
6700 K
8700 K
900 K
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Question # 41
Do bends in a wire affect its electrical resistance
Choose an answer
Yes
No
Affects a little
None of these
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