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MDCAT Physics Online Test MCQs With Answers
Question # 1
During adiabatic compression of a gas,its temperature
Choose an answer
Falls
Rises
Remains constant
Becomes zero
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Question # 2
Laser beam can be used for
Choose an answer
Wilding of detached retinas
Destroy tissues in a localized area
Sealed off capillaries for prevention of disease
All of them
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Question # 3
Inner shell transition in X-Rays takes place in
Choose an answer
Lighter elements
Medium element
Heavy elements
None of these
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Question # 4
Which one of the following is scalar?
Choose an answer
Magnetic field
Flux density
Magnetic flux
Induced emf.
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Question # 5
Which of the following pairs represent units of the same physical quantity
Choose an answer
Kelvin and joule
Kelvin and calorie
Newton and calorie
Joule and calorie
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Question # 6
When a charge particles is moving in magnetic field the magnetic force acts on it changes
Choose an answer
Magnitude of its velocity
Direction of its velocity
Both magnitude and direction
Neither magnitude nor direction
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Question # 7
When a body moves in a circle its projection performs what type of motion?
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Circular Motion
Angular Motion
Simple Harmonic Motion
Rectilinear Motion
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Question # 8
According to Huygen's principle, every point of a wavefront may be considered as a source of
Choose an answer
primary wavelets
secondary wavelets
either of them
both of them
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Question # 9
When a mass 'm' is pulled slowly, the spring stretched by an amount X
0
then the average force would be
Choose an answer
F = KX
0
F = 1/2 KX
0
F = 1/2 KX
0
2
F = 1/4 KX
0
2
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Question # 10
Why do real gases deviate from ideal bahaviour?
Choose an answer
Real gases consist of a very small number of molecules within a given volume
Real gasses have intermolecular forces
Molecules of real gases are not in rapid, random motion
None of them
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Question # 11
Optically active substance are those substance which
Choose an answer
Produce polarization of polarized light
Rotate the plane of polarization of polarized light
Produce double refraction
Both a and b
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Question # 12
Kirchhoff's first rule is also known as
Choose an answer
Kirchhoff's point rule
Law of conservation of charge
Kirchhoff's current rule
All of them
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Question # 13
When the temperature of source and sink of heat engine become equal than efficiency of heat engine will
Choose an answer
Maximum
Minimum
Negative
Zero
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Question # 14
In order to get interference using two light rays:
Choose an answer
The sources should be monochromatic and coherent
The sources should have the same frequency
Superposition should be linear
All of these
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Question # 15
In carbon colour coded resistances the fourth silver band indicates the tolerance is
Choose an answer
± 5 %
±10 %
± 20 %
None of these
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Question # 16
A 1500 kg car has its velocity reduced from 20 ms
-1
to 15 ms
-1
in 3.0 S. How large was the average retarding force
Choose an answer
- 4.5 KN
- 2.5 KN
- 3.7 KN
- 4.3 KN
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Question # 17
The temperature at which the speed of sound becomes double as was at 27°C is
Choose an answer
273°C
0°C
927°C
1027°C
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Question # 18
Electromotive force is not a force and is measured in
Choose an answer
Coulomb
Ampere
Volt
None of these
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Question # 19
At the temperature a body emits radiation which is principally
Choose an answer
of long wavelengths and in the visible region
of long wavelengths in the invisible infrared region
of short wavelength in invisible ultraviolet region
none of them
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Question # 20
Which of the following sets of concurrent forces may be in equilibrium?
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F
1
- 3 N,F
2
- 5 N,F
3
= 6 N
F
1
- 3 N,F
2
- 5 N,F
3
= 15 N
F
1
- 3 N,F
2
- 5 N,F
3
= 1 N
F
1
- 3 N,F
2
- 5 N,F
3
= 9 N
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Question # 21
The limit up to which the stress is directly proportional to strain is called
Choose an answer
Elastic limit
Proportional limit
Breaking limit
Ultimate tensile limit
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Question # 22
The defection in moving coil galvanometer falls from 50 division to 10 division,when a shunt of 12 Ω is applied the resistance of galvanometer coil is
Choose an answer
24 Ω
12 Ω
50 Ω
48 Ω
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Question # 23
The resistors used in most of electronic device are made of
Choose an answer
gold
copper
rubber
carbon
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Question # 24
A pipe has a length of 1m. Determine the fundamental frequency when one end of the pipe is closed. Speed of air is 340 ms
Choose an answer
80 Hz
82 Hz
84 Hz
85 Hz
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Question # 25
The heart of machine is
Choose an answer
Lamp and camera unit
Aluminium drum
Charging unit
All of them
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Question # 26
The energy supplied to unit charge by the cell is defined as
Choose an answer
conductivity
resistivity
emf (E)
potential difference
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Question # 27
Viscosity of gas with increase in temperature
Choose an answer
Decreases
Increases
No change
All
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Question # 28
When a current-carrying conductor of length 'L' is placed in magnetic field B, this experience a force
Choose an answer
F = IL/B
F = ILB Sin
θ
F = BI Sin
θ
F = ILB Cos
θ
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Question # 29
With two up quarks and one down quark, which of the following can be made?
Choose an answer
electron
proton
photon
neutron
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Question # 30
When the density is constant for the steady flow of incompressible fluid equation of continuity becomes
Choose an answer
ρ
1
A
1
V
1
= ρ
2
A
2
V
2
ρ
1
m
1
A
1
V
1
= ρ
1
m
1
A
2
V
2
A
1
V
1
= A
2
V
2
None of these
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Question # 31
The basic circuit element in D.C. circuit is a
Choose an answer
Capacitor
Resistor
Inductance
None of these
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Question # 32
The minimum frequency below which no electrons are emitted is called
Choose an answer
Lowest frequency
Threshold frequency
Synchronized frequency
None of these
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Question # 33
The base of the transistor is very thin of the order of
Choose an answer
10
-2
m
10
-4
m
10
-6
m
10
-8
m
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Question # 34
At resonance if the capacitance of the capacitor is doubled in resonance series circuit than the resonance frequency is
Choose an answer
Also doubled
Become four times
Decreases by √2-times
Increases by √2 times
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Question # 35
Gravity performs zero work when body moves
Choose an answer
Vertically
Horizontally
At angle 60° with vertical
At angel 60° with horizontal
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Question # 36
Semiconductors, like Ge or Si at room temperature becomes a
Choose an answer
Semiconductor
Conductor
Insulator
None of these
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Question # 37
In which of the following detector the size of the pulse in independent of the energy of the particle
Choose an answer
GM counter
Solid state detector
Both a & b
None
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Question # 38
When a nuclear emits an alpha radiation/particles its atomic number drops by
Choose an answer
1
2
3
4
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Question # 39
Ohms is the unit of
Choose an answer
current
capacitance
energy
resistance
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Question # 40
The relation between Boltzmann's constant K, gas constant R and Avogadro's number is N
A
is
Choose an answer
K = N
A
/R
K = RN
A
K = R/N
A
K = PV/NT
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Question # 41
If the distance of separation between two chares is increased,the electrical potential energy of the system will
Choose an answer
Increase
Decrease
May increase or decrease
Remain the same
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