CBSE

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

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

Resistance in each will increase

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

Resistance in each will decrease

Question 1 of 25

2. At absolute zero, Si acts as ?

Non-metal

None of these

Insulator

Metal

Question 2 of 25

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

Same as the input

Half wave rectified

Zero

Full wave rectified

Question 3 of 25

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

Emitter

Base

Any of the above depending upon the nature of transistor

Collector

Question 4 of 25

5. 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 ?

1.5 Ω

5 Ω

200 Ω

6.67 Ω

Question 5 of 25

6. When n-type semiconductor is heated ?

Number of electrons and holes increases equally

Number of electrons and holes remain same

Number of holes increases while that of electrons decreases

Number of electrons increases while that of holes decreases

Question 6 of 25

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

Number of holes increases force is applied in the forward direction

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

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

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

Question 7 of 25

8. Radiowaves of constant amplitude can be generated with ?

Oscillator

FET

Rectifier

Filter

Question 8 of 25

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

The cathode

The glass-envelope

The anode

The grid

Question 9 of 25

10. Diamond is very hard because ?

High melting point

Insoluble in all solvents

It has large cohesive energy

It is covalent solid

Question 10 of 25

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

π/2

Zero

π/4

Question 11 of 25

12. To use a transistor as an amplifier ?

No bias voltage is required

Both junctions are reverse biased

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

Both junctions are forward biased

Question 12 of 25

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

Drift charges

Both drift and diffusion of charges

Depends on the nature of material

Diffusion of charges

Question 13 of 25

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

AND

NAND

XOR

Question 14 of 25

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

Van der Waals'

Covalent

Metallic

Ionic

Question 15 of 25

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

n-type semiconductor

p-type semiconductor

n-type conductor

insulator

Question 16 of 25

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

Antimony

Phosphorus

Arsenic

Indium

Question 17 of 25

18. 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 V

i is proportional to V2

Question 18 of 25

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

The holes flow from emitter to collector

The electrons flow from collector to emitter

The electrons flow from emitter to collector

The electrons flow from battery to emitter

Question 19 of 25

20. An oscillator is nothing but an amplifier with ?

Negative feedback

Positive feedback

No feedback

Large gain

Question 20 of 25

21. 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 ?

0.29 mA

0.43 mA

0.35 mA

0.39 mA

Question 21 of 25

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

NAND

AND

XOR

Question 22 of 25

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

Diffusion of charge carriers

Di=rift of electrons

Migration of impurity ions

Drift of holes

Question 23 of 25

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

Zero

π/4

π/2

Question 24 of 25

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

Aluminium

both (b) and (c)

Phosphorus

Magnesium

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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