The reverse biasing in a PN junction diode
| (a) Decreases the potential barrier |
|
(b) Increases the potential barrier |
|
(c) Increases the number of minority charge carriers |
|
(d) Increases the number of majority charge carriers |
(b) Increases the potential barrier
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The patient is asked to drink 
for examining the stomach by X-rays because X-rays are
|
(a) Reflected by heavy atoms |
(b) Refracted by heavy atoms |
|
(c) Less absorbed by heavy atoms |
(d) More absorbed by heavy atoms |
In a transformer, the number of turns in primary coil and secondary coil are 5 and 4 respectively. If 240 V is applied on the primary coil, then the ratio of current in primary and secondary coil is
|
(a) 4 : 5 |
(b) 5 : 4 |
(c) 5 : 9 |
(d) 9 : 5 |
When germanium is doped with phosphorus, the doped material has
|
(a) Excess positive charge |
(b) Excess negative charge |
|
(c) More negative current carriers |
(d) More positive current carriers |
A plane glass slab is kept over various coloured letters, the letter which appears least raised is
|
(a) Blue |
(b) Violet |
(c) Green |
(d) Red |
The deflection in a moving coil galvanometer is
|
(a) Directly proportional to the torsional constant |
|
(b) Directly proportional to the number of turns in the coil |
|
(c) Inversely proportional to the area of the coil |
|
(d) Inversely proportional to the current flowing |