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MDCAT Physics Online Test MCQs With Answers
Question # 1
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Question # 2
The '
β
' is the coefficient of the gas for
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Linear expansion
Volume expansion
Area expansion
None of these
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Question # 3
Spectrometer using diffraction grating can measure
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Wavelength of light
Frequency of light
Intensity of light
None of these
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Question # 4
Point out the element having atomic mass = 63.5465:
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Br
Zn
Cu
Ni
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Question # 5
At what temperature does the mean kinetic energy of hydrogen atoms increase to such extent that they will escape out of the gravitational field of earth forever
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10075°K
18000°K
14075°K
22000°K
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Question # 6
The diffraction of light occurs, due to interference, of
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Obstructed portion
Unobstructed portion
Both obstructed and unobstructed light
None of these
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Question # 7
One kilowatt hour is equal
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3.5 × 10
5
J
3.6 × 10
8
J
3.6 × 10
6
J
3.5 × 10
6
J
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Question # 8
Gravitation is the property of matter which is
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External
Internal
Intrinsic
None of these
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Question # 9
The time period of second pendulum is
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1s
2s
0.5s
4s
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Question # 10
β-rays are infact fast moving electrons coming out from the
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Outside the nucleus
Inside the nucleus
As free electrons
None of these
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Question # 11
Just before setting the sun may appear to be elliptical This happens due to
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Diffraction
Reflection
Dispersion
Refraction
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Question # 12
In YDS experiment, at the center of screen is formed a:
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Dark fringe
Bright fringe
No fringe at all
None of these
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Question # 13
On increasing the reverse bias to a large value in a p-n junction diode current
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Increases slowly
Remains fixed
Suddenly increases
Decreases slowly
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Question # 14
AN electric bulb and a capacitor are connected in a series with an AC source on increasing the frequency of the source the brightness of the bulb
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Increases
Decreases
Remain unchanged
Sometimes increases and sometimes decreases
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Question # 15
In an ac circuit with voltage V and current 1 the power dissipated is
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VI
1/2 VI
1/√2 VI
Depends on the phase between V and I
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Question # 16
The equation PVr = Constant applies to:
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Isothermal process
Adiabatic process
Isobaric process
None of these
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Question # 17
The ’β' is the coefficient of the gas is
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Linear expansion
Volume expansion
Area expansion
None of these
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Question # 18
The rate of change of momentum of a molecule is equal to:
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Pressure
Work
Density
Force
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Question # 19
When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
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thermoionic electrons
free electrons
photoelectrons
slow electrons
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Question # 20
Alpha-particles are
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Protons
Positron
Neutrally charged
Ionized helium atoms
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Question # 21
Which one of the following detectors can count fast and operate at low voltage
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Geiger counter
Wilson-cloud-chamber
Solid-state detector
Scintillation counter
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Question # 22
The magnetic field along the axis of a solenoid with 'N' turns carrying a current I is given by
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Question # 23
If light of low wavelength is used in Young's double slit experiment then width of the fine will
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Decreases
Increase
Not fixed
No change
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Question # 24
If a force acts on a body whose action line does not pass through its centre of gravity.then the body will experience
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Angular acceleration
Linear acceleration
No acceleration
None of these
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Question # 25
The r.m.s value of a.c current is always
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Positive
Negative
Zero
All of these
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Question # 26
Internal energy per mole of gas depends on
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Viscosity
Density
Temperature
Thermal conductivity
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Question # 27
An alternating current is that which
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changes continuously in magnitude and reverses periodically in direction
flow intermittently
varies in magnitude
gets only its direction reversed after equal intervals of time
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Question # 28
By calculating the area under the velocity time graph, we can find the
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Acceleration
Velocity
Distance
None of these
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Question # 29
The range of particle depends upon the factor
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charge, mass and energy of particle
density of medium
ionization potential of the atoms
all of them
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Question # 30
Which property of waves proves that light is a transverse wave?
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diffraction
interference
polarization
reflection
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Question # 31
The typical speed of reconnaissance jet (SR-71) is
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900 ms
-1
950 ms
-1
980 ms
-1
990 ms
-1
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Question # 32
In carnot cycle, there are isotherms as
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One
Two
Three
Four
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Question # 33
Nuclear force is
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Attractive and short-range force
Repulsive and short-range force
Attractive and long-range force
Repulsive and long-range force
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Question # 34
The three equation of motion are useful only for
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linear motion with increasing acceleration
linear motion with uniform acceleration
linear motion with zero acceleration
linear motion with varying acceleration
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Question # 35
Carnot cycle is:
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Reversible
Irreversible
Sometimes A, Sometimes B
None of these
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Question # 36
The original source of tides is
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Ocean
Sun
Earth
Moon
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Question # 37
Identify the exact statement among the following:
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The greater the mass of a pendulum bob.the shorter is its frequency of oscillation
A simple pendulum with a bob of mass M swings with an angular amplitude of 40°.When its angular amplitude is 20°,the tension in the string is less than Mg cos 20°
As the length of a simple pendulum is increased the maximum velocity of its bob during its oscillation will also increase
The fractional change in the time period of a pendulum on changing the temperature is independent of the length of the pendulum.
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Question # 38
According to the Newton's formula, the speed of the sound at STP comes out to be
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220 ms
-1
330 ms
-1
332 ms
-1
280 ms
-1
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Question # 39
The horizontal component of a projectile moving with initial velocity of 500 ms
-1
at an angle 60
° to x-axis is
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500 ms
-1
1000 ms
-1
250 ms
-1
zero
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Question # 40
The relative permitivity ∈
r
for Paraffined paper is
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1.9
2.0
2.2
2.9
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Question # 41
The study of atomic structure of crystals by X-rays was initiated by W.H.. Bragg and W.L. Bragg in
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1920
1926
1910
1914
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