
- ANAND
- BNOR
- CNOT
- DAND

Explanation:
The symbol of circle shown in figure with OR gate indicates the NOT gate hence, given gate is NOR gate.
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An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be
|
(a) 100 Å |
(b) 10000 Å |
(c) 1 mm |
(d) 1 cm |
An electric lamp is marked 60 W, 230 V. The cost of 1 kilowatt hour of power is Rs. 1.25. The cost of using this lamp for 8 hours is
|
(a) Rs. 1.20 |
(b) Rs. 4.00
|
(c) Rs. 0.25 |
(d) Rs. 0.60 |
A region surrounding a stationary electric dipoles has
|
(a) Magnetic field only |
(b) Electric field only |
|
(c) Both electric and magnetic fields |
(d) No electric and magnetic fields |
The electrons are emitted in the photoelectric effect from a metal surface
|
(a) Only if the frequency of the incident radiation is above a certain threshold value |
|
(b) Only if the temperature of the surface is high |
|
(c) At a rate that is independent of the nature of the metal |
|
(d) With a maximum velocity proportional to the frequency of the incident radiation |
Assertion : When PN-junction is forward biased then motion of charge carriers at junction is due to diffusion. In reverse biasing. The cause of motion of charge is drifting.
Reason : In the following circuit emitter is reverse biased and collector is forward biased.

|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |