Physics

Question 1

1Which logic gate gives an output of 1 only when both inputs are 1?

Easy

A. AND B. OR C. NOT D. NOR

Question 2

2A transistor can be used as

Easy

A. an amplifier and a switch B. a rectifier only C. a battery D. a resistor only

Question 3

3Doping a semiconductor means

Easy

A. coating it with plastic B. cooling it C. adding small amounts of impurity to increase conductivity D. heating it

Question 4

4A diode is used in rectification to

Easy

A. store charge B. convert a.c. to d.c. C. convert d.c. to a.c. D. step up voltage

Question 5

5A semiconductor is a material whose conductivity is

Easy

A. always constant B. higher than copper C. zero D. between that of a conductor and an insulator

Question 6

6A NAND gate is an AND gate followed by a NOT gate.

Medium

A. True B. False

Question 7

7A p–n junction diode conducts when it is

Easy

A. reverse biased B. forward biased C. cold D. unconnected

Question 8

8A transistor has three terminals called

Easy

A. north, south and centre B. emitter, base and collector C. live, neutral and earth D. anode, cathode and grid

Question 9

9The process of converting a.c. to d.c. is called ___.

Easy

Your answer (fill in the blank)

Question 10

10Adding impurities to a semiconductor is called ___.

Easy

Your answer (fill in the blank)