## Tuesday, April 23, 2013

### Important Questions of Physics for MCAT MBBS Entrance Test 2013

SELF TEST QUESTIONS (PHYSICS)
Choose single best option
Q.1  At the present time, how many frontiers of fundamental science are there:
A)  Two
B)  Three
C)  One
D)  Four
Q.2  The unit of pressure in base unit is:
A)  Kg ms-2
B)  Kg ms2
C)  Kg m-1 s-2
D)  Kg m-1 s-1
Q.3  The physical quantity which produces angular acceleration in body is called:
A)  Force
B)  Momentum
C)  Centripetal force
D)  Torque
Q.4  A man in an elevator ascending with an acceleration will conclude that his weight
has:
A)  Decreased
B)  Increased
C)  Reduced to zero
D)  Remained constant
Q.5  The Law of conservation of mass gives us the equation of:
A)  Stoke’s law
B)  Continuity
C)  Bernoulli’s theorem
D)  Torricelli’s theorem
Q.6  1 torr is equal to :
A)  135.3 Nm-2
B)  133.3 Nm-2
C)  132.3 Nm-2
D)  130.3 Nm-2
Q.7  Viscosity of liquids with rise in temperature:
A)  Increases
B)  Decreases
C)  Remains the same
D)  First decreases then increases
Q.8  The phenomenon of polarization of light reveals that light waves are:
A)  Extremely short waves
B)  Longitudinal waves
C)  Transverse electromagnetic waves
D)  Long wavelength waves
Q.9  Diffraction of X-rays by crystals show that:
A)  X-rays are just like visible light
B)  X-rays are electromagnetic waves
C)  X-rays have very short wavelength
D)  The intensity of X-rays is high
Q.10  The image of an object 7mm high is only 1.4 cm high. The magnification produced by
lens is:
A)  0.7
B)  1
C)  2
D)  0.2
Q.11  Infra-red signals travel through optical fibres of wavelength about:
A)  2 μm
B)  1.3 μm
C)  1.5  μm
D)  1.9 μm
Q.12  Total energy of a body executing simple harmonic motion is directly proportional to:
A)  The amplitude
B)  Square root of amplitude
C)  Reciprocal of amplitude
D)  Square of amplitude
Q.13  The wavelength of the wave produced in a microwave oven is:
A)  15 cm
B)  13 cm
C)  12 cm
D)  10 cm
Q.14  The frequencies of ultrasonic waves are:
A)  In audible range
B)  Greater than 20 kHz
C)  Lower than 20 kHz
D)  Greater than 20 Hertz
Q.15  A train is approaching a station at 90 Kmh-1
sounding a whistle of frequency 1000Hz.
What will be the apparent frequency of the whistle as heard by a listener sitting on the platform?
A)  1079.4 Hz
B)  1179.4 Hz
C)  1078.5 Hz
D)  1178.5 Hz
8
Q.16  Mathematical notation for “ NAND” gate is:
A)  B A X  
B)
________
B   . A   X
C)
__ __
. B A X 
D)  B   . A   X
Q.17  Heat leaves a system; it is taken as:
A)  Positive
B)  Negative
C)  Neither positive nor negative
D)  Zero
Q.18  First Law of Thermodynamics is the Law of:
A)  Conservation of momentum
B)  Conservation of Energy
C)  Conservation of mass
D)  Conservation of velocity
Q.19  Increase in temperature is due to increase in:
A)  Translational K.E
B)  Rotational K.E
C)  Gravitational K.E
D)  Vibrational K.E
Q.20 v=2/3n/p<1/2mv2 represents:
A)  Boyle’s law.
B)  Ideal gas
C)  Charles law
D)  Gas general equation
Q.21  The dimension of strain is:
A)  [ T ]
B)  [ M ]
C)  [ LT-1]
D)  None.
Q.22  The ratio of applied stress to volumetric strain is called:
A)  Young’s modulus
B)  Shear modulus
C)  Bulk modulus
D)  Modulus of elasticity
Q.23  Beam of electron can be called as:
A)  Positive rays
B)  Cathode rays
C)  Cosmic rays
D)  X-rays
Q.24  Pressure of gas given by:

Q.25  ‘OR’ and ‘AND’ gates have:
A)  Two outputs
B)  Single output
C)  Three output
D)  No output
Q.26  Shunt Resistance is called:
A)  Low resistance
B)  High resistance
C)  Bypass resistance
D)  Specific resistance
Q.27  One Coulomb per second is equal to:
A)  One volt
B)  One ampere
C)  One Walt
D)  One ohm
Q.28  Ohm is defined an:
A)  VC-1
B)  VA-1
C)  CV-1
D)  AV-1
Q.29  A current carrying conductor is surrounded by:
A)  Magnetic field
B)  Electric field
C)  Conservative field
D)  Gravitational field
Q.30  Force on a charged particle having charge ‘ q ‘ moving with velocity ‘ v ‘ parallel to
magnetic field of intensity ‘ B ‘ is given by:
A)  F = q vb
B)  F = vb/q
C)  F = q v/B
D)  F = 09
Q.31  In X-ray tube electrons are accelerated by applying a:
A)  High current between anode and
cathode
B)  High voltage between anode and
cathode
C)  High stopping potential between
anode and cathode
D)  High power between anode and
cathode
Q.32  In medical science which radiations are used to locate fractures or cracks in bones or
teeth:
C)  X-rays
Q.33  The minimum wavelength of X-ray produced if 10kvp Potential difference is applied
across the anode and cathode of the tube is:
A)  1.24 x 10-10m
B)  12.4 x 10-10m
C)  124 x 10-10m
D)  0.124 x 10-10m
Q.34  Laser light is highly:
A)  Directional
B)  Scattered
C)  Unpolarized
D)  Non- directional
Q.35  A light beam from a high power laser when focused by a lens can produce:
A)  A high temperature
B)  A low temperature
C)  A moderate temperature
D)  A very low temperature
Q.36  A laser beam can be employed safely to weld a detached:
A)  Bone of body
B)  Finger of hand
C)  Retina of eye
D)  Tooth
Q.37  CT scanning is the abbreviated name of:
A)  Computed Technology
B)  Computed Tomography
C)  Computerized Technique
D)  Classical Technique
Q.38  One curie is equal to:
A)  3.70 x 1010
atoms decay in one
second
B)  3.70 x 10
8
atoms decay in one
second
C)  3.70 x 10
6
atoms decay in one
second
D)  3.70 x 10
4
atoms decay in one
second
Q.39  In cloud chamber, each track corresponds to the passage of:
A)  One group of  α particles
B)  One α  particle
C)  Two  α  particles
D)  Three  α  particles
Q.40  In β  –  particle emission its mass of nucleus remains practically the same while its
charge changes by:
A)  One unit
B)  Two unit
C)  Three unit
D)  Four unit
Q.41  A nuclide
220
R84 decay to a new nuclide  S by two α  - emissions and two β  emissions;
the nuclide S is:
A)
218
S84
B)
216
S84
C)
212
S82
D)
216
S82
Q.42  Beta particles are fast moving particles, called:
A)  Protons
B)  Electrons
C)  Neutrons
D)  α-Particles
Q.43  Cobalt-60 is used to:
A)  Cure blood cancer
B)  Cure bone cancer
C)  Cure thyroid cancer
D)  Cure tumor
Q.44  In radioactivity, the rate of decay:
A)  Can be increased by magnetic field
B)  Can be decreased by magnetic field
C)  Can be kept constant by electric field
D)  Is not effected by electric or
magnetic field