A. -1000 J
B. +1000 J
C. +2000 J
D. -2000 J
# Fraunhoffer spectrum of sun is:
A. Band absorption spectrum in chromosphere
B. Line absorption spectrum in chromosphere
C. Emission spectrum
D. Band emission spectrum
# The power produced by a prism of small angle A:
A. Depends on material of prism only
B. Depends on A only
C. Depends both on material and A
D. Depends neither on material nor on A
# In Young's double slit interference experiment, the slit is made 3 folds, then fringe width becomes:
A. 1/3 folds
B. 3 folds
C. 3/6 folds
D. 6 folds
# A stone is released from the window of a train moving along a horizontal straight track. The stone will hit the ground. Then what will be the path of the stone observed by a man standing on the ground near the train?
A. Straight line
B. Parabola
C. Hyperbola
D. Eclipse
# A particle experiences constant acceleration for 20 seconds after starting from rest. If it travels a distance D1 in the first 10 seconds and distance D2 in the next 10 seconds, then:
A. D2=D1
B. D2=2D1
C. D2=4D1
D. D2=3D1
# When a body of known mass is thrown vertically upwards with velocity u, it hits the ground after sometimes. Which of the following is the wrong statement for its journey.
A. Total displacement of the body is zero.
B. Average velocity of the body is zero.
C. The velocity of the body on hitting the ground is u/2.
D. Average speed of the body will be u.
# A car travels one third of the distance on a straight road with velocity V1, next one third with V2 and the last one third with velocity V3. What is the average velocity of the car in the whole journey?
A. (V1+v2+V3)/3
B. (V1V2+V2V3+V1V3)/3
C. 3V1V2V3/(V1V2+V1V3+V2V3)
D. (V1+V2+V3)/3V1V2V3
# Which one of the following is correct for projectile motion?
A. The body has constant velocity
B. The body has only one velocity
C. The body moves under the action of two velocities simultaneously
D. The body has constant acceleration throughout the journey
# Hall's constant:
A. is always positive
B. is always negative
C. sometimes negative and sometimes positive
D. Any of the above is possible
# Which statement explains adiabatic process?
A. A process in which internal energy remains constant.
B. A process in which there is a continuous flow of heat.
C. An insulated system with no heat flow between the system and its surrounding.
D. A process with constant temperature and pressure.
# A heat engine operates by extracting heat from a source at high temperature T1 and :
A. Converting whole of it into work
B. Converting some of it into work and rejecting the rest at lower temperature T2
C. Converting some of it into work and rejecting the rest at same temperature
D. Converting the rest at a temperature higher than T1
# If the radius of the earth were to decrease by 1%, its mass remaining the same, the acceleration due to gravity on the surface of the earth will:
A. Increase by 1%
B. Decrease by 2%
C. Decrease by 1%
D. Increase by 2%
# If the radius of the earth's orbit is made one fourth, the duration of year will become:
A. 1/8 times
B. 1/4 times
C. 1/8 times
D. 1/16 times
# The principle of which of the following is based on deviation without dispersion?
A. Chromatic doublet
B. Achromatic doublet
C. Spectrometer
D. Direct vision spectroscope
# When P-N junction diode is forward biased and then reverse biased, the flow of current is mainly due to:
A. Diffusion of electrons in first case and drift velocity in the second case
B. Drift velocity in first case and diffusion of electrons in the second case
C. Diffusion of electrons in both cases
D. Drift velocity in both cases.
# The threshold wavelength for photoelectric emission for a material is 5200 Angstrom. Photoelectrons will be emitted when the material is illuminated with monochromatic radiation from:
A. 50 watt infrared lamp
B. 0.5 watt infrared lamp
C. 0.5 watt sodium vapor lamp
D. 50 watt ultraviolet lamp
# A photon has mass of:
A. c^2/hv
B. h/v
C. hvc^2
D. hv/c^2
# In A.C. motor capacitor is used:
A. to reduce ripples
B. to decrease A.C.
C. to increase A.C.
D. to decrease D.C.
# The temperature above which a ferromagnetic substance becomes paramagnetic is called:
A. Joule's point
B. Curie point
C. Ambient point
D. Maxwell Point
# Two bulbs of 500 W and 300 W are manufactured to operate on 220 V line. The ratio of heat produced in 500W and 300W when connected in parallel connection is:
A. 5:3
B. 9:25
C. 3:5
D. 1:1
# If a 2.0 microfarad condenser is charged to 100 watt and its plates are connected by a wire, the heat produced in the wire is:
A. 1*10^-4 J
B. 1*10^-5 J
C. 7*10^-4 J
D. 4*10^-4 J
# When amplitude is increased three times and frequency is reduced to one third of original value, the intensity of sound at a point will:
A. remain unchanged
B. increase three times
C. increase 9 times
D. decrease to one third
# A thin film of water is formed between two straight parallel wires each 10 cm long and 0.5 cm apart. Calculate the work required to increase 100 mm distance between the wires. (Surface tension= 72*10^-3 N/m)
A. 34*10^-8 J
B. 5*10^-5 J
C. 144*10^-7 J
D. 288*10^-7 J
# The ratio of the shortest and longest wavelength in the first line spectrum of hydrogen:
A. 3/4
B. 2334/628
C. 25
D. 1/25
# Two gases A and B having the same temperature T pressure P and volume V are mixed. If the mixture is at the same temperature T and ocupies a volume V, the pressure of mixture is:
A. 2P
B. P
C. P/2
D. 4P
# If P be the pressure and E be the energy density of gas molecules then:
A. P=3/2E
B. P=2/3E
C. P=1/3E
D. P=3E
# A bird is sitting on the floor of a wire case with airtight system which a boy is carrying. When the bird starts flying, the boy will feel that the box is:
A. Lighter
B. Heavier
C. No change in weight
D. nothing can be said
# Which of the following physical quantities have the same dimensional formula?
A. impulse and momentum
B. work and power
C. Boltzmann's constant and Stephen's constant
D. Surface tension and energy
# A man pushes a wall with a force of 200 N. Then:
A. Wall does not push him because it is so huge
B. Wall repels him with a huge force
C. The wall is also pushing him with 200 N
D. He does 200J of work
# If a cell of emf 60V is connected across an external resistance of 20 Ohm. Then, potential difference across the cell for maximum heat generation is:
A. 20 V
B. 30 V
C. 40 V
D. 50 V
# Which statement is incorrect?
A. weight of body in pole is greater than that in equator
B. weight of body in plain is greater than that in hill
C. weight and mass are same physical quantities
D. None of the above
# If a bucket full of water is rotated in a vertical circle than tension in the highest point is equal to :
A. Centrifugal force
B. Centrifugal force + Weight of the rope
C. Centrifugal force - Weight of the rope
D. Weight of bucket + Weight of rope
# A source emitting frequency of 450 Hz is moving towards stationary observer with velocity 33 m/sec. Then the observed frequency is:
A. 400 Hz
B. 500 Hz
C. 480 Hz
D. 530 Hz
# In an uniform electric field:
A. Potential increases with increase in distance
B. Potential decreases with decrease in distance
C. Potential remains constant everywhere
D. Potential is zero everywhere
# For an ideal diatomic gas difference of Cp and Cv is 4600 unit. The value of molar specific heat at constant volume is:
A. 3700
B. 5300
C. 11500
D. 9200
# In H- atom, momentum of 2nd Bohr orbit is (Pi=3)
A. 2.2*10^-34 NSec
B. 3.3*10^-34 NSec
C. 1.1*10^-34 NSec
D. 13.2*10^-34 NSec
# Light from vacuum enters to a medium of mu=1.5. If it crosses it within a nanosecond, the thickness of the medium is:
A. 10 cm
B. 20 cm
C. 40 cm
D. 70 cm
# In Bohr's model, transition takes place as A(2-->1) B(3-->2) and C(4-->3), then longest wavelength and longest change in radius occurs in:
A. A,A
B. A,B
C. B,C
D. C,C
# The work done in moving a charge of 10C through 10 cm in an electric field is 50 J. Then the potential at that surface is:
A. 5 V
B. 50 V
C. 2.5 V
D. 25 V
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