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MDCAT Physics Online Test MCQs With Answers
Question # 1
A hollow metal sphere of radius 5 cm is change such that the potential on its surface 10 V. the potential at the centre of the sphere is
Choose an answer
Zero
10 volts
The same as that at a point 5 cm away from the surface
The same as that a at point 25 cm away from the surface
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Question # 2
A particle is moving in a uniform magnetic field then
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Its momentum changes but total energy remains the same
Both momentum and total energy remains the same
Both changes
Total energy change but momentum remains
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Question # 3
In common emitter amplifier (I
0
/I
E
) = 0.98,then current gain is
Choose an answer
49
4.9
98
9.8
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Question # 4
A phenomenon in which a high energy photon scattered by an atomic electron and transfer a part of its energy is known as
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Photoelectric effect
Compton effect
X-rays
None of these
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Question # 5
How many sivert can cause radiation burns to skin is
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1 SV
2 SV
3 SV
4 SV
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Question # 6
Ultra-violet radiation of 6.2 eV falls on an aluminium surface.K.E of fastest electron emitted is (Work function = 4.2 eV)
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3.2 x 10-21 J
3.2 x 10-19 J
7 x 10-25 J
9 x 10-32 J
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Question # 7
α-particle is
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Positively charge
Negatively charge
Neutral
None of these
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Question # 8
The Zeroth law of thermodynamics states that
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a system remains at constant temperature if no heat is supplied to it
if two bodies are in thermal equilibrium with a third body then they must be in thermal equilibrium with each other
the heat supplied to a system is proportional to the internal energy of a system
there is no Zeroth law
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Question # 9
Moment of inertia of a sphere is
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1/3 mr
2
3/4 mr
2
4/5 mr
2
2/5 mr
2
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Question # 10
Proton was discovered by Rutherford in
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1915
1906
1910
1920
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Question # 11
The field inside the solenoid is
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Weak
Strong
Very strong
None of these
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Question # 12
The atom or molecules in crystalline solids are held together by:
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Cohesive force
Adhesive force
Gravitational force
Magnetic forces
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Question # 13
The damping effect for the pith-ball due to air resistance and for the lead ball is
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Lowest
Greater
Much greater
None of these
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Question # 14
If two non zero vectors A and B obey the relation |A + B| = |A - B|.then the angle between them is:
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120°
90°
60°
0°
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Question # 15
Magnetic effect is utilized in
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Electric Iron
Thermocouple
Measurement of current
None of these
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Question # 16
As cross-sectional area of the pipe decreases the speed of fluids must increase according to
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Bernoulli's equation
Venture's reaction
Equation of continuity
Torricelli's theorem
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Question # 17
Two sources are said to be coherent if they have:
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Same amplitude
Same wavelength
Definite phase relation with each other
None of them
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Question # 18
The symbol of ohm is
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C
°
K
mol
Ω
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Question # 19
The second law of thermodynamics is concerned with the situation in which
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Heat can be converted into work
Direction of flow of heat
Both A & B
None of these
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Question # 20
The wavelength of microwaves is
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Smallest than the wavelength of violet light
Larger than the wavelength of red light
Smallest than the wavelength of yellow light
Larger than the wavelength of radio waves
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Question # 21
When OP-AMP is used as inverting amplifier, which of the input terminal is grounded?
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inverting
non-inverting
any one of them
none of them
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Question # 22
Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field?
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Li
+
Electron
Proton
He
+
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Question # 23
The symbol for specific resistance of material of the wire is
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Ω
p
ω
t
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Question # 24
Human body is composed of particles to produce electric force are
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Atoms
Molecules
Charges
All of them
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Question # 25
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 # 26
Forα-particle and X-rays of equal absorbed dose, theα-particle are moer damaging than X-rays are
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10 times
20 times
30 times
40 times
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Question # 27
The advantage/advantages of fiber optics than radio wave carriers
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Much wider band width
Capability
Immunity
All of these
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Question # 28
Three particles having charges in the ratio of 1 : 2 : 3 produce the same point on the photographic film in the Thomson's experiment.Their masses are
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2 : 3 : 1
3 : 2 : 1
1 : 2 : 3
1 : 3 : 2
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Question # 29
The speed of light in vacuum or in air is
Choose an answer
3 x 10
10
m ! s
3 x 10
9
m ! s
3 x 10
8
m ! s
3 x 10
7
m ! s
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Question # 30
The K.E of the molecule of an ideal gas at absolute zero will be
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Infinite
Zero
Very high
Below zero
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Question # 31
G. P. Thomson observed experimentally that electrons and neutrons possess
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particle-like properties
wave-like properties
neither particle nor wave-like properties
none of them
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Question # 32
On moving from one place to another electromagnetic radiations behave as
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Particles
Waves
Both Particles and Waves
None of the above
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Question # 33
In order to have constant current, a constant source is required as
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Current source
Potential difference
A resistance source
None of these
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Question # 34
The direction of magnetic field as given by Fleming's rule for the solenoid is along
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Normal to the solenoid
Can't be taken
The axis of the solenoid
None of the above
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Question # 35
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 # 36
In an interference fringes pattern the fringes are
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Equally spaced
Wider near the centre and narrower away from it
Narrower near the centre and wider away from it
None of these
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Question # 37
In electromagnetic induction, the induced current depends
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Conductor's speed of motion
Resistance of loop
Both a and b
None of these
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Question # 38
For a given angle of projection if the time of flight of a projectile is doubled the horizontal range will increases to:
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Four times
Thrice
Once
Twice
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Question # 39
The electrical circuit used to bet smooth DC output from a rectifier circuit is called
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Logic gates
Amplifier
Filter
Oscillator
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Question # 40
Which of the following converts electrical energy into mechanical energy?
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D.C. generator
A.C. generator
motor
transformer
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Question # 41
A mass spectrograph is the device use to
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Separate Isotopes
Find the isotopes
Find the neutrons
a and b
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