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 Multiple Choice QuestionsMultiple Choice Questions

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11.

The logic circuit shown below has the input waveforms ‘A’ and ‘B’ as shown. Pick out the correct output waveform.


output is

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12.

A working transistor with its three legs marked P, Q and R are tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal of P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?

  • It is an n-p-n transistor with R as base

  • It is a p-n-p transistor with R as collector

  • It is a p-n-p transistor with R as emitter 

  • It is a p-n-p transistor with R as emitter 

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13.

In the circuit below, A and B represent two inputs and C represents the output. The circuit represents

  • NOR gate

  • AND gate

  • NAND gate

  • NAND gate

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14.

If in a p-n junction diode, a square input signal of 10V is applied as shown Then the output signal across RL will be 

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15.

For the given uniform square lamina ABCD, whose centre is O,

  • square root of 2 space straight I subscript AC space equals space straight I subscript EF
  • IAD = 3IEF

  • IAC = IEF

  • IAC = IEF

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16.

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

  • The number of free conduction electrons is significant in C but small in Si and Ge

  • The number of free conduction electrons is negligibly small in all the three

  • The number of free electrons for conduction is significant in all the three

  • The number of free electrons for conduction is significant in all the three

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17.

A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will

  • flow from Antimony to Bismuth at the cold junction

  • flow from Antimony to Bismuth at the hot junction

  • flow from Bismuth to Antimony at the cold junction

  • flow from Bismuth to Antimony at the cold junction

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18.

A solid which is transparent to visible light and whose conductivity increases with temperature is formed by

  • Metallic binding

  • Ionic binding

  • Covalent binding

  • Covalent binding

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19.

If the ratio of the concentration of electrons that of holes in a semiconductor is 7 /5 and the ratio of currents is 7/4, then what is the ratio of their drift velocities?

  • 4/7

  • 5/8

  • 4/5

  • 4/5

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20.

In a common base mode of a transistor, t collector current is 5.488 mA for an emit current of 5.60 mA. The value of the base current amplification factor (β) will be

  • 48

  • 49

  • 50

  • 50

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