Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius 
and 
respectively. The ratio of mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
(c) 
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The wiring of a house has resistance 6Ω A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly
|
(a) Nil |
(b) 23 V |
(c) 32 V |
(d) 12 V |
Two rays A and B being reflected by a mirror and going as A' and B'. The mirror:
If two streams of protons move parallel to each other in the same direction, then they
|
(a) Do not exert any force on each other |
|
(b) Repel each other |
|
(c) Attract each other |
|
(d) Get rotated to be perpendicular to each other |
A person cannot see objects clearly beyond 2.0 m. The power of lens required to correct his vision will be
|
(a) + 2.0 D |
(b) – 1.0 D |
(c) + 1.0 D |
(d) – 0.5 D |
It is desired to photograph the image of an object placed at a distance of 3m from the plane mirror. The camera which is at a distance of 4.5 m from the mirror should be focussed for a distance of
| (a) 3m | (b) 4.5m | (c) 6m | (d) 7.5 m |
The maximum current that flows through a fuse wire before it blows out varies with its radius as
|
(a) |
(b) r |
(c) |
(d) |
A 4 mF capacitor, a resistance of 2.5 MW is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given ln(2)= 0.693]
|
(a) 13.86 s |
(b) 6.93 s |
(c) 7 s |
(d) 14 s |
