Two opposite and equal charges 4 × 
when placed 2 
cm away, form a dipole. If this dipole is placed in an external electric field 4 
, the value of maximum torque and the work done in rotating it through 180° will be
|
(a) 64 |
(b) 32 |
|
(c) 64 |
(d) 32 |
(d) 32 
and 64 
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The colour of the positive column in a gas discharge tube depends on
|
(a) The type of glass used to construct the tube |
(b) The gas in the tube |
|
(c) The applied voltage |
(d) The material of the cathode |
The atomic weight of silver and copper are 108 and 64. A silver voltameter and a copper voltameter are connected in series and when current is passed 10.8 gm of silver is deposited. The mass of copper deposited will be
|
(a) 6.4 gm |
(b) 12.8 gm |
(c) 3.2 gm |
(d) 10.8 gm |
When cathode rays strike a metal target of high melting point with very high velocity, then
| (a) X-rays are produced | (b) Ealpha-rays are produced |
| (c) TV waves are produced |
(d) Ultrasonic waves are produced |
Heat radiations propagate with the speed of
|
(a) a-rays |
(b) b-rays |
(c) Light waves |
(d) Sound waves |
The equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is
|
(a) 2 henry |
(b) 3 henry |
(c) 4 henry |
(d) 5 henry |
Absolute refractive indices of glass and water are 
and 
. The ratio of velocity of light in glass and water will be
|
(a) 4 : 3 |
(b) 8 : 7 |
(c) 8 : 9 |
(d) 3 : 4 |
In any fission process the ratio 
is
|
(a) Less than 1 |
|
(b) Greater than 1 |
|
(c) Equal to 1 |
|
(d) Depends on the mass of the parent nucleus |