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PMT-PDT SCREENING - 2004
PHYSICS
01. When three identical bulbs of 60 watt, 200
volt rating are connected in series to a 200 volt
supply, the power drawn by them will be
a) 180 watt b) 10 watt
c) 20 watt d) 60 watt
Ans:c
02. The electric resistance of a certain wire of iron
is R. If its length and radius are both doubled, then
a) the resistance will be halved and the
specific resistance will remain unchanged
b) the resistance will be halved and the
specific resistance will be doubled
c) the resistance and the specific resistance,
will both remain unchanged
d) the resistance will be doubled and the
specific resistance will be halved
Ans:a
03. Resistance n, each of r ohm, when connected
in parallel give an equivalent resistance of R ohm.
If these resistances were connected in series, the combination would have a resistance in
ohms, equal to
a)  b) 
c) n R d) 
Ans:d
04. The unit of permitivity of free space,  , is
a) 
b) 
c) 
d) 
Ans:b
05. A galvanometer acting as a voltmeter will have
a) a high resistance in parallel with its coil
b) a low resistance in parallel with its coil
c) a low resistance in series with its coil
d) a high resistance in parallel with its coil
Ans:a
06. Which one of the following statements is true
for the speed  and the acceleration a of a
particle executing simple harmonic motion ?
a) value of a is zero, whatever may be the value
of 
b) when  is zero, a is zero
c) when  is maximum, a is zero
d) when  is maximum, a is maximum
Ans:c
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07. Two springs of spring constants  and  are joined in series. The effective spring constant
of the combination is given by
a)  b) 
c)  d) 
Ans:c
08. If the diodes shown in the following
diagrams, which one is reverse biased ?
a) 
b) 
c) 
d) 
Ans:b
09. A car is moving towards a high cliff. The car
driver sounds a horn of frequency f. The reflected
sound heard by the driver has a frequency 2f. If v be
the velocity of sound, then the velocity of the car,
in the same velocity units, will be
a) v/3 b) v/4
c) v/2 d) 
Ans:a
10. The density of a newly discovered planet is
twice that of earth. The acceleration due to gravity
at the surface of the planet is equal to that at
the surface of the earth. If the radius of the earth is
R, the radius of the planet would be
a) 4 R b) 
c)  d) 2 R
Ans:c
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