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30. Which of the
following is the correct diagram of a half wave rectifier ?
a)  b) 
c)  d) 
Ans
:  (VST-F-07)
31. A system is
provided with 200 cal of heat and the work done by the system on the surrounding
is 40J. Then its internal energy .........
Ans
: Decreases by 800 J. (VST-07)
32. The magnitude
of resultant of two forces is equal to the magnitude of either force, then the
angle between the forces is ..........
Ans
: 1200 (TPMT/PDT-01)
33. The Doppler's
effect is independent of ..........
Ans
: Distance between source and listener.(DT-23)
34. In an open
organ pipe, which wave is present ?
Ans
: Longitudinal standing wave. (ST-19)
35. In a seconds
pendulum, mass of the bob is 30 gm. If it is replaced by 90 gm mass, then its
time period will be..............
Ans
: 2 sec (WATJEE-03)
36. Frequency of
a wave is  . In which region this frequency belongs ?
Ans
: X-ray (WATJEE-)
37. Electric
field of an isolated metallic sphere at any interior point is ..........
Ans
: Zero (TPMT/PDT-02)
38. A body at
rest explodes into two equal parts, then ...........
Ans : They move with same speed in opposite
direction.
(DT-27)
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39. Co-efficient of thermal conductivity of a
metallic rod depends upon ...............
Ans : Nature of material.
(TPMT/PDT-09)
40. A double convex lens  having focal length of a concave mirror. The radius
of curvature of the concave mirror is ..........
Ans : 20 cm (VST-03)
41. A body has same temperature as that of
the surrounding, then
a) it never radiates heat
b) it radiates same heat as absorbed from
the surrounding
c) it radiates more heat as absorbed from
the surrounding
d) it radiates less heat as absorbed from
the surrounding
Ans : It radiates same heat as absorbed from
the surrounding. (VST-09)
42. The theory associated with secondary
wavelet is ...........
Ans :
Huygen's wave theory (WATJEEP-18)
43. The points resembling the equal potential
are ........
Ans : R and S ()
44. A solid ball of metal has a concentric
spherical cavity within it. If the ball is heated, the
volumes of the cavity will
a) increase
b) decrease
c) Remains unaffected
d) none of these
Ans : Increases (VST-05)
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