If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is
|
(a) 3 |
(b) 1.5 |
(c) 6 |
(d) |
(b) 1.5 
m/s
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If a = 0.98 and current through emitter ie = 20 mA, the value of b is
|
(a) 4.9 |
(b) 49 |
(c) 96 |
(d) 9.6 |
In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y
|
(a) 50 cm |
(b) 80 cm |
(c) 40 cm |
(d) 70 cm |
Light takes 8 min 20 sec to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time (a
|
(a) 8 min 20 sec |
(b) 8 min |
(c) 6 min 11 sec |
(d) 11 min 6 sec |
In the circuit, the potential difference across PQ will be nearest to
|
(a) 9.6 V |
(b) 6.6 V |
(c) 4.8 V |
(d) 3.2 V |
Electronic configuration of germanium is 2, 8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added
|
(a) The material obtained will be N-type germanium in which electrons and holes are equal in number |
|
(b) The material obtained will be P-type germanium |
|
(c) The material obtained will be N-type germanium which has more electrons than holes at room temperature |
|
(d) The material obtained will be N-type germanium which has less electrons than holes at room temperature |
