PYQ Bank - EduGrown

#1 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE

A point source in air is kept 24 cm in front of a concave spherical glass surface ($_a\mu_g = 1.5$) and radius of curvature 60 cm. Find the nature of the image formed and its distance from the point source.

👁 View Answer

👍 1 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#2 Class 12 Physics Atoms 2022 Short 3M CBSE

Define the term – Distance of closest approach. How will it be affected, for an $\alpha$-particle, if kinetic energy of the particle is doubled?

👁 View Answer

👍 3 👎 3

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#3 Class 12 Physics Semiconductor 2022 Short 2M CBSE

Write the characteristics of a p-n junction which make it suitable for rectification.

👁 View Answer

👍 2 👎 3

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#4 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 2M CBSE

Plot suitable graphs to show the variation of photoelectric current with collector plate potential for incident radiation of:The same intensity but different frequencies $f_1, f_2$, and $f_3$ ($f_1 < f_2 < f_3$)...

👁 View Answer

👍 6 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#5 Class 12 Physics Atoms 2022 Short 2M CBSE

Draw the graph showing the variation of the number (N) of scattered alpha particles with scattering angle ($\theta$) in Geiger–Marsden experiment. Infer two conclusions from the graph.

👁 View Answer

👍 1 👎 1

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#6 Class 12 Physics Semiconductor 2022 Short 2M CBSE

Draw energy band diagrams of n-type and p-type semiconductors at temperature T > 0K, depicting the donor and acceptor energy levels. Mention the significance of these levels.

👁 View Answer

👍 1 👎 1

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#7 Class 12 Physics Semiconductor 2023 Long 4M CBSE

Case Study on semiconductor diode (forward and reverse bias): (i) For diode D with $R = 100\ \Omega$, EMF $= 3.5$ V, barrier potential $= 0.5$ V, find the current in the circuit. (ii) Identify which figure shows the p...

👁 View Answer

👍 1 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#8 Class 12 Physics Semiconductor 2023 Short 3M CBSE

Explain briefly: (i) How barrier potential is formed in p-n junction diode. (ii) How the width of the depletion region is affected when it is (a) forward biased, (b) reverse biased.

👁 View Answer

👍 3 👎 3

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#9 Class 12 Physics Semiconductor 2022 Short 2M CBSE

Which device is used to convert AC into DC? State its underlying principle and explain its working. If the frequency of input AC is 60 Hz, what will be the frequency of the output?

👁 View Answer

👍 3 👎 3

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#10 Class 12 Physics Semiconductor 2023 Long 4M CBSE

Case Study on p-n junction diode: (I) If Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively and Ge diode connections are reversed, how does $V_0$ change? (II) A diode circuit: find $V_0$ and $I_d$. (III...

👁 View Answer

👍 2 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#11 Class 12 Physics Semiconductor 2023 Long 4M CBSE

Case Study on LED: (i) Why are LEDs made of compound semiconductors and not elemental semiconductors? (ii) What should be the order of bandgap of an LED to emit light in the visible range? (iii) A student connects a b...

👁 View Answer

👍 3 👎 4

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#12 Class 12 Physics Semiconductor 2022 Short 2M CBSE

In the graph of potential barrier versus width of depletion region for an unbiased diode (Graph A), graphs B and C are obtained after biasing. Identify the type of biasing in B and C and justify your answer.

👁 View Answer

👍 3 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#13 Class 12 Physics Semiconductor 2021 Short 2M CBSE

The circuit has a pure semiconductor $S$ in series with a variable resistor $R$ and a constant voltage source $V$. Should $R$ be increased or decreased to keep the ammeter reading constant when $S$ is heated? Justify.

👁 View Answer

👍 2 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#14 Class 12 Physics Semiconductor 2023 Long 5M CBSE

Explain the band theory of solids. State how solids are classified into conductors, insulators and semiconductors on this basis.

👁 View Answer

👍 4 👎 4

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#15 Class 12 Physics Semiconductor 2021 Short 2M CBSE

The circuit has two oppositely connected ideal diodes in parallel. Find the current through each diode in the circuit. (Battery = 12 V; $R_1 = 4\ \Omega$, $R_2 = 3\ \Omega$, $R_3 = 2\ \Omega$ with D1 and D2 in branches.)

👁 View Answer

👍 2 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#16 Class 12 Physics Semiconductor 2022 Long 5M CBSE

Draw the circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the output and input waveforms.

👁 View Answer

👍 4 👎 3

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#17 Class 12 Physics Semiconductor 2021 Short 3M CBSE

Name the important process that occurs during formation of a p-n junction. Explain how a p-n junction is formed. Define barrier potential.

👁 View Answer

👍 2 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#18 Class 12 Physics Semiconductor 2022 Long 5M CBSE

Explain, with the help of a circuit diagram, the working of a p-n junction diode as a half-wave rectifier.

👁 View Answer

👍 3 👎 4

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#19 Class 12 Physics Semiconductor 2022 Short 3M CBSE

Draw V-I characteristics of a p-n junction diode. Answer: (i) Why is the reverse current almost independent of applied potential up to a critical voltage? (ii) Why does reverse current show a sudden increase at critic...

👁 View Answer

👍 3 👎 4

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

#20 Class 12 Physics Semiconductor 2021 Short 2M CBSE

Draw the energy band diagram of (a) n-type and (b) p-type semiconductor at temperature $T > 0$ K. Mark the donor and acceptor energy levels with their energies.

👁 View Answer

👍 2 👎 2

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

Naya question paper

PYQ Bank & Paper Generator