Download Q 1: A moving charge will produce

Merit Students SEEE
Time: 1 Hr.
Class: XII - Physics
Total Marks: 25
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Q 1: A moving charge will produce
a 4 b 12
a no field b an electric field
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c 9 d2
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c a magnetic field d both 'b' and 'c'
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Q 7: Find the resistance of a circuit between A and B in the
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figure below
Q 2: A man in air, a fish in water appears to be at 30 cm
from the surface. If refractive index of water is 4/3, then the
true depth at which the fish remain is :
a 30 cm b 40 cm
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c 50 cm d 35 cm
a 3 R b 3 R/2
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Q 3: If refractive index of calcite crystal is
for O-ray and
c R/3 d 2 R/3
for E-ray, then along the optical axes of the crystal.
a
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b
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Q 8: If there are n capacitors in parallel connected to V volt
)
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source, then energy stored is equal to
c
d none of these
a CV b
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Q 4: In Young's double slit experiment, the separation
c CV2 d
between the slits is halved and the distance between the
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slits and screen is doubled. The fringe width is
Q 9: If the number of condensers are connected in series,
a unchanged b doubled
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then their resultant capacitance is
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a
c halved d quadrupled
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b
Q 5: Electric lines of force about positive charge are
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a circular, clockwise b circular, anticlockwise
c
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c radial inward d radial outward
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higher than the highest individual capacity
equal to the sum of the individual capacity
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Q 6: A parallel plate air capacitor has a capacitance
.
If the distance between the plates is trebled and a dielectric
The dielectric constant of the medium is
lower than the lowest individual capacity
d cannot be predicted
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medium is introduced the capacitance becomes
)
.
Q 10: If two condensers of capacity C1 and C2 are
connected in parallel, their equivalent capacity Cp is
a C1 + C 2 b
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c
connected across 1 ohm resistor with a battery of emf of 1
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volt. The readings in the two voltmeters respectively will be
d
a 1 volt and zero b ( 1/2) volt
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Q 11: Sixty four charged drops of capacity C and potential
c zero volt and zero volt
V are put together to form a bigger drop. If charge on each
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drop is q, then the charge on bigger drop will be
d
a 16 q b 4 q
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Q 16: Which one of the following is not an application of
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) each
the combination will not work
c 64 q d q
eddy currents ?
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a
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Q 12: Electric intensity at a distance r from the centre of a
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conducting sphere having a charge q is
b
a
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b
speedometer of automobiles
damping of oscillations of a simple pendulum
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c damping of a galvanometer d induction furnace
c
d
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Q 17: A and B are section of two long parallel wires placed
Q 13: In the following circuit, minimum current will flow
perpendicular to the plane of paper. They carry currents of
through the resistance of
5 ampere and 10 ampere respectively in the directions
indicated in the directions indicated in the figure. If the
separation between them is 3 m, the zero of the magnetic
field in the plane of the paper is at a point
a
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c
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b
a 3 m to the left A b 3 m to the right of B
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d
c 2 m to the right of A d 2 m to the left of B
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Q 14: Which one of the following radiation has the lowest
a visible light b X-rays
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c microwaves d Ultraviolet rays
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Q 18: Which one of the following substance is diamagnetic
frequency ?
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Q 15: Two smaller voltmeter of same ranges are
connected in series and this series combination is
?
a liquid oxygen b air
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c copper sulphate d water
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Q 19: In a series L-C-R circuit, the value of L and C are so
adjusted that the maximum current flows through the
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circuit. In the case, if the P.D. across L is 200V, then the
Q 23: Which of the following is NOT disadvantage of
P.D. across the capacitance will be
transistor over a triode?
a more than 200V b less than 200V
a low efficiency
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c equal to 200V
b
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d
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P.D. across the resistance
c higher noise level
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Q 20: Einstein photoelectric equation states that
d
In this equation v refers to
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a
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b
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c
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d
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velocity of all ejected electrons
mean velocity of emitted electrons
minimum velocity of emitted electrons
maximum velocity of emitted electrons
Q 21: The de Broglie wavelength associated with a ball of
mass 200 g and moving at a speed of 5 meters/hour, is of
the order of
can handle only smaller currents
Q 24: The velocity of electromagnetic waves in a medium
is
The electric constant of the medium is
a 4 b 2.25
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c 3/2 d 2/3
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Q 25: The belt of an electrostatic generator is 50 cm wide
and travels 30 cm / sec. The belt carries charge into the
sphere at a rate corresponding to
b
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c
d
ampere. What is
the surface density of charge on the belt.
a
a
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higher temperature sensitivity
b
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c
d
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Q 22: In case of an n-p-n transistor, the collector current is
always less than the emitter current, because
a
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b
)
c
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d
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emitter side is forward biased
collector side is reverse biased
a few electrons are lost in the base
a few electrons are lost in the emitter
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