The capacity of a parallel plate capacitor increases with the
|
(a) Decrease of its area |
(b) Increase of its distance |
|
(c) Increase of its area |
(d) None of the above |
(c) Increase of its area
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The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to 
. The thickness of lead which will reduce the intensity to 
will be
|
(a) 18 mm |
(b) 12 mm |
(c) 6 mm |
(d) 9 mm |
Drift velocity 
varies with the intensity of electric field as per the relation
|
(a) |
(b) |
(c) |
(d) |
A and B are two radioactive substances whose half lives are 1 and 2 years respectively. Initially 10 gm of A and 1 gm of B is taken. The time (approximate) after which they will have same quantity remaining is
|
(a) 6.62 years |
(b) 5 years |
(c) 3.2 years |
(d) 7 years |
A small object is placed 10 cm infront of a plane mirror. If you stand behind the object 30 cm from the mirror and look at its image, the distance focused for your eye will be
|
(a) 60 cm |
(b) 20 cm |
(c) 40 cm |
(d) 80 cm |
X-rays when incident on a meta
|
(a) Exert a force on it |
(b) Transfer energy to it |
|
(c) Transfer pressure to it |
(d) All of the above |
