Physics – Class 12 Mock Test 10

10%

Question 1 of 10

1. The I-V characteristics of a LED are similar to that of Si junction diode.

True

False

Question 1 of 10

Question 2 of 10

2. Modulation is a process of the superposing high-frequency audio signal on low-frequency radiowaves.

False

True

Question 2 of 10

Question 3 of 10

3. Identify the one on which no external bias is applied.

Solar cell

Zener diode

Photodiode

Light-emitting diode

Question 3 of 10

Question 4 of 10

4. Which of the following gates can have only one input?

NAND gate

NOT gate

AND gate

OR gate

Question 4 of 10

Question 5 of 10

5. Name the process of recovering the original information signal from the modulated wave at the receiver end.

Modulation

Bandwidth

Demodulation

Attenuation

Question 5 of 10

Question 6 of 10

6. Find the value of output direct current if the peak value of output current is given as 0.095 A.

6.06

0.6

0.05

0.060

Question 6 of 10

Question 7 of 10

7. Pick out the expansion of ITU.

International Telecommunication University

International Telephone Union

International Telecommunication Union

Internal Telecommunication Union

Question 7 of 10

Question 8 of 10

8. The base forms two p-n junctions with the emitter and the collector.

True

False

Question 8 of 10

Question 9 of 10

9. What is the refractive index of the ionosphere?

Zero

More than one

One

Less than one

Question 9 of 10

Question 10 of 10

10. A transistor having α = 0.90 is used in a common base amplifier. If the load resistance is 5.0 kΩ and the dynamic resistance of the emitter junction is 50 Ω, then calculate the voltage gain.

100

Question 10 of 10