CBSE

1. When arsenic is added as an impurity to silicon the resulting material is ?

insulator

n-type conductor

n-type semiconductor

p-type semiconductor

Question 1 of 25

2. The current gain for a transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is ?

0.35 mA

0.39 mA

0.29 mA

0.43 mA

Question 2 of 25

3. When a p-n junction diode is reverse biased the flow of current across the junction is mainly due to ?

Depends on the nature of material

Both drift and diffusion of charges

Diffusion of charges

Drift charges

Question 3 of 25

4. At absolute zero, Si acts as ?

None of these

Insulator

Non-metal

Metal

Question 4 of 25

5. When a n-p-n transistor is used as an amplifier, then ?

The electrons flow from battery to emitter

The holes flow from emitter to collector

The electrons flow from collector to emitter

The electrons flow from emitter to collector

Question 5 of 25

6. Which one of the following is the weakest kind of the bonding in solids ?

Van der Waals'

Covalent

Ionic

Metallic

Question 6 of 25

7. In figure the input is across the terminals A and C and the output is across B and D. Then the output is ?

Zero

Same as the input

Half wave rectified

Full wave rectified

Question 7 of 25

8. Which of the following gates corresponds to the truth table given below ?

XOR

AND

NAND

Question 8 of 25

9. Radiowaves of constant amplitude can be generated with ?

Oscillator

FET

Filter

Rectifier

Question 9 of 25

10. An oscillator is nothing but an amplifier with ?

No feedback

Large gain

Positive feedback

Negative feedback

Question 10 of 25

11. A piece of copper and other of germanium are cooled form the room temperature to 80 K, then ?

Resistance in each will decrease

Resistance in each will increase

the resistance of copper will decrease while that of germanium will increase

The resistance of copper will increase while that of germanium will decrease

Question 11 of 25

12. For amplification by a triode the signal to be amplified is given to ?

The cathode

The anode

The glass-envelope

The grid

Question 12 of 25

13. The part of the transistor which is heavily doped to produce large number of majority carriers is ?

Collector

Emitter

Base

Any of the above depending upon the nature of transistor

Question 13 of 25

14. Which of the following, when added as an impurity, into the silicon, produces n-type semiconductor ?

both (b) and (c)

Magnesium

Phosphorus

Aluminium

Question 14 of 25

15. In a common base amplifier the phase difference between the input single voltage and the output voltage is ?

Zero

π/2

π/4

Question 15 of 25

16. p-n junction is said to be forward biased, when ?

The positive pole of the battery is connected to n-semiconductor and p-semiconductor

The positive pole of the battery is joined to then n-semiconductor and negative pole to the p-semiconductor

Number of holes increases force is applied in the forward direction

The positive pole of the battery is joined to the p-semiconductor and negative pole to the n-semiconductor

Question 16 of 25

17. The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatt. What should be teh value of the resistor R, connected in series with the diode, for obtaining maximum current i ?

5 Ω

1.5 Ω

6.67 Ω

200 Ω

Question 17 of 25

18. The depletion layer in the p-n junction region is caused by ?

Drift of holes

Di=rift of electrons

Diffusion of charge carriers

Migration of impurity ions

Question 18 of 25

19. Diamond is very hard because ?

Insoluble in all solvents

It is covalent solid

High melting point

It has large cohesive energy

Question 19 of 25

20. To use a transistor as an amplifier ?

The emitter base junction is forward biased and the base collector junction is reversed biased

Both junctions are forward biased

Both junctions are reverse biased

No bias voltage is required

Question 20 of 25

21. When n-type semiconductor is heated ?

Number of electrons and holes increases equally

Number of holes increases while that of electrons decreases

Number of electrons increases while that of holes decreases

Number of electrons and holes remain same

Question 21 of 25

22. For an electronic valve, the plate current i and plate voltage V in the space charge limited region are related as ?

i is proportional to V2/3

i is proportional to V3/2

i is proportional to V2

i is proportional to V

Question 22 of 25

23. When a triode is used as an amplifier the phase difference between the input signal voltage and the out put is ?

Zero

π/2

π/4

Question 23 of 25

24. The following truth table corresponds to the logical gate ?

XOR

NAND

AND

Question 24 of 25

25. To obtain a p-type germanium semiconductor, it must be doped with ?

Antimony

Arsenic

Indium

Phosphorus

Question 25 of 25

Test Name	Solids and Semiconductor Devices Test
Subject	CBSE Physics
Test Type	MCQs
Total Question	25
Total Marks	50
Total Time	20 Minutes
Test Help For	CBSE Physics. CBSE Board Exams. Entrance Exams. Admissions Test. Jobs Test. General Knowledge. All Grades Exams.

Test By Subject	CBSE
Test By Topics	Solids and Semiconductor Devices

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CBSE Physics Solids and Semiconductor Devices Test Online

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