1
MCQ (Single Correct Answer)

AIPMT 2002

In a p-n junction
A
high potential at n side and low potential at p side
B
high potential at P side and low potential at n side
C
p and n both are at same potential
D
undetermined.

Explanation

For conduction, p-n junction must be forward biased. For this p-side should be connected to higher potential and n-side to lower potential.
2
MCQ (Single Correct Answer)

AIPMT 2002

For a transistor $${{{I_C}} \over {{I_E}}}$$ = 0.96, then current gain for common emitter is
A
12
B
6
C
48
D
24

Explanation

$${{{I_C}} \over {{I_E}}}$$ = 0.96 = $$\alpha $$

$$ \therefore $$ Current gain, $$\beta $$ = $${{{I_C}} \over {{I_B}}}$$ = $${\alpha \over {1 - \alpha }}$$ = 24
3
MCQ (Single Correct Answer)

AIPMT 2002

Number of atom per unit cell in B.C.C.
A
9
B
4
C
2
D
1

Explanation

In body-centred cubic (b.c.c.) lattice there are eight atoms at the corners of the cube and one at the centre.

Therefore number of atom per unit cell

= $${1 \over 8} \times 8$$ + 1 = 2
4
MCQ (Single Correct Answer)

AIPMT 2001

The current in the circuit will be

A
5/40 A
B
5/50 A
C
5/10 A
D
5/20 A

Explanation

D1 is reverse biased and D2 is forward biased.

$$ \therefore $$ I = $${5 \over {30 + 20}}$$ = $${5 \over {50}}$$ A

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