HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions

When a hole is produced in P-type semiconductor, there is _______.

When a p-n-p transistor is operated in saturation region, then its ______.

(A) base-emitter junction is forward biased and base-collector junction is reverse biased.
(B) both base-emitter and base-collector junctions are reverse biased.
(C) both base-emitter and base-collector junctions are forward biased.
(D) base-emitter junction is reverse biased and base-collector junction is forward biased

If the charge on the condenser of 10°F is doubled, then the energy stored in it becomes __________

The logic gate which produces LOW output when one of the input is HIGH and produces
HIGH output only when all of its inputs are LOW is called _______.

(A) AND gate

(B) OR gate

(C) NOR gate

(D) NAND gate

Distinguish between intrinsic and extrinsic semiconductor. (Give any two points).

Draw the schematic symbols for AND, OR, NOT and NAND gate

Explain the working of transistor as a switch.

The width of depletion region of p-n junction diode is _______.

(A) 0.5 nm to 1 nm

(B) 5 nm to 10 nm

(C) 50 nm to 500 nm

(D) 500 nm to 1000 nm

State its any ‘two’ uses of photodiode.

Draw a circuit diagram for studying the input and output characteristics of a n-p-n transistor in common emitter configuration. Using the circuit, explain how input, output characteristics are obtained

A pure semiconductor is ________.

(a) an extrinsic semiconductor

(b) an intrinsic semiconductor

(c) p-type semiconductor

(d) n-type semiconductor

What is Zener diode?

Name the logic gate which generated high output when at least one input is high.

Distinguish between p-type and n-type semiconductors.

What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure?

The process of superimposing a low frequency signal on a high frequency wave is_______ .

The power radiated by linear antenna of length T is proportional to........................

(λ= wavelength)

1. `lambda/ l`
2. `[lambda/l]^2`
3. `l/lambda`
4. `[l/lambda]^2`

Define modulation and transducer

The process of regaining of information from carrier wave at the receiver is called .................

(a) modulation

(b) transmission

(c) propagation

(d) demodulation

Draw a neat, labeled diagram showing different layers of the Earth’s atmosphere.