A small sphere carrying a charge ‘q’ is hanging in between two parallel plates by a string of length L. Time period of pendulum is 
. When parallel plates are charged, the time period changes to T . The ratio 
is equal to
|
(a) |
(b) |
(c) |
(d) None of these |
(c) 
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The half life of radioactive Radon is 3.8 days. The time at the end of which 1/20 th of the Radon sample will remain undecayed is (Given 
|
(a) 3.8 days |
(b) 16.5 days |
(c) 33 days |
(d) 76 days |
A magnifying glass is used to read the newspaper. As it is moved far away from the newspaper:
Lenz's law is consequence of the law of conservation of
|
(a) Charge |
(b) Momentum |
(c) Mass |
(d) Energy |
The truth table shown in figure is for
|
A |
0 |
0 |
1 |
1 |
|
B |
0 |
1 |
0 |
1 |
|
y |
1 |
0 |
0 |
1 |
|
(a) XOR |
(b) AND |
(c) XNOR |
(d) OR |
The charge on electron was discovered by
|
(a) J.J. Thomson |
(b) Neil Bohr |
(c) Millikan |
(d) Chadwick |
