- A1.6 × 10 + 19C.
- B1.6 × 10 - 19C.
- C1.6 × 10 - 20C.
- DNone.
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In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is:
Three bulbs of 40 W, 60 W, 100 W are arranged in series with 220 volt supply which bulb has minimum resistance
|
(a) 100 W |
(b) 40 W |
(c) 60 W |
(d) Equal in all bulbs |
Given below are symbols for some logic gates

The XOR gate and NOR gate respectively are
|
(a) 1 and 2 |
(b) 2 and 3 |
(c) 3 and 4 |
(d) 1 and 4 |
A lens is placed between a source of light and a wall. It forms images of area
and
on the wall for its two different positions. The area of the source or light is
|
(a) |
(b) |
(c) |
(d) |
The combination of ‘NAND’ gates shown here under (figure) are equivalent to


|
(a) An OR gate and an AND gate respectively |
|
(b) An AND gate and a NOT gate respectively |
|
(c) An AND gate and an OR gate respectively |
|
(d) An OR gate and a NOT gate respectively. |
If Fresnel’s biprism experiment as held in water inspite of air, then what will be the effect on fringe width
|
(a) Decrease |
(b) Increase |
(c) No effect |
(d) None of these |