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MDCAT Physics Online Test MCQs With Answers
Question # 1
α-particle emitted with the
Choose an answer
Double energy
Same energy
Half of the energy
None of these
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Question # 2
Beta particle are
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hydrogen nuclei
helium nuclei
electrons
photons
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Question # 3
Magnetic effect produced due to passage of an electric current through a metallic conductor, utilized in
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Detection of current
Detection of voltage
Creating resistance
None of these
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Question # 4
The correct unit of Kinematic viscosity in SI system is
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ra(D) s
-2
m
2
.s
-1
g.s
-2
N .sm
-2
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Question # 5
Speed of sound in water at 20°C is
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1214 ms
-1
1343 ms
-1
1483 ms
-1
1567 ms
-1
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Question # 6
Which of the following types of cells will be most affected by radioactive rays?
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growing cells
cells that are dividing rapidly
both a and b
cells that divide rarely
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Question # 7
How many satellites form the Global positioning system ?
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4
3
20
24
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Question # 8
A sine wave is represented by Q the distance between the two particles having same maximum displacement is
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λ/4
λ
2λ
λ/2
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Question # 9
Vector A lies in XY plane. For what orientation with both of its rectangular components be negative ?
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I-quadrant
II-quadrant
III-quadrant
None of these
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Question # 10
In a PN junction
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High potential at N side and low potential at P side
High potential at P side and low potential at N side
P and N both are at same potential
Undetermined
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Question # 11
In p-p chain reaction, the energy given out is
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20.01 MeV
25.7 MeV
26.9 MeV
27.8 MeV
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Question # 12
A tall chimney has the advantage/advantages
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Reduce top pressure
Force
Upward flow of smoke
All of these
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Question # 13
The value of the input resistance of OP-AMP is if the order of
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few ohms
few hundred ohms
several kilo ohms
several maga ohms
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Question # 14
Which of the following is a dimensionless quantity
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Momentum / Acceleration
Volume / Area
Energy / Work
Force / Power
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Question # 15
Due to collisions of electrons, with the atoms of conductor, the energy transfer ultimately to the
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Atoms
Electrons
Lattice
All of them
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Question # 16
At constant temperature, if the volume of a given mass of a gas is doubled, then the density of gas becomes:
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Double
Remains constant
Half
None of these
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Question # 17
The angle between two vectors -2î + 3ĵ + k̂ and î + 2ĵ-4k̂ is:
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0°
90°
180°
None of the above
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Question # 18
What is the volume (approx.) of 200 moles of an ideal gas kept at S.T.P?
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5 cm
3
50 cm
3
5,000 cm
3
50,000 cm
3
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Question # 19
A container of volume 8 x 10
4
m
3
occupies 20 g oxygen kept at a temperature of 373K.Calculate oxygen pressure
Choose an answer
2.420 kPa
24.20 kPa
242.0kPa
2420kPa
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Question # 20
For the monochromatic beam of X-rays, the crystal planes in a lattice act like a
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perfect absorbers
boundary
mirror
none of them
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Question # 21
Which of the following is conserved when light waves interfere
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Intensity
Energy
Amplitude
Momentum
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Question # 22
In a n-p-n transistor:
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Negative charge moves from collector to base
Negative charge moves from emitter to base
Holes move from base to collector
Holes move from emitter to base
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Question # 23
If the mass of the uranium is much greater than the critical mass than
Choose an answer
More neutrons are produced
Rapid chain reaction
Huge explosion is produced
All of them
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Question # 24
The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be
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1 : 2
4 : 1
1 : 4
2 : 1
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Question # 25
In an ideal transformer, the following factors are used
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Input and output power is same
Currents are inversely proportional to voltage
Currents are directly proportional to voltage
None of these
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Question # 26
The collection time of electrons and holes of solid state detector is much less than gas filled counters, therefore is counter
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Fast
Low
Very low
None of these
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Question # 27
The direction of the angular velocity vector is along
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The tangent to the circular path
The inward radius
The outward radius
The axis of rotation
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Question # 28
The sum of positive and negative peak values are usually written as
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P-P value
Negative
Zero
May be positive or negative
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Question # 29
If the distance between the plates of a parallel plate condenser of capacity 10 μF is doubled then new capacity will be
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5μF
20 μF
10μF
15 μF
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Question # 30
If a stretched string of length 'I' is plucked from its centre, two waves originate, such that
Choose an answer
both will move towards left
both will move towards right
one towards left and other towards right
any one of them
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Question # 31
The apparent change in the frequency of sound when an observer is moving away from the source at rest is
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Question # 32
When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltages is
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90
°
75
°
0
180
°
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Question # 33
For glass-air boundary the critical angle θ
c
is
Choose an answer
30
o
41.8
o
42.0
o
44.0
o
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Question # 34
The light waves and radio waves differ in
Choose an answer
Speed
Frequency
Wavelength
Both B and C
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Question # 35
For the normal operation of the transistor, its
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emitter-base and collector base junctions are forward biased
emitter-base junction is reversed biased and collector base junction is forward biased
emitter-base junction is forward biased and collector base junction is reverse
any one of them
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Question # 36
Two waves having same frequency and travelling in the same direction is called
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Diffraction
Interference
Polarization
All of these
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Question # 37
At high frequencies of A.C. source in RLC series circuit, the
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Capacitance dominates
Inductance dominates
Resistance dominates
None of these
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Question # 38
The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself
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Equal to
Greater than
Smaller than
None of these
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Question # 39
Two wires A and B are made of copper both wires are 1m long but wire A is 1mm. thick and wire B is 2mm Thick. The specific resistance
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More for wire A
More for wire B
Same for both wires A and B
Cannot be compared
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Question # 40
For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleus is
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A - Z
A
Z
A + Z
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Question # 41
The mass density of a nucleus varies with mass number A as
Choose an answer
A
2
A
Constant
1/A
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