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1

### AIPMT 2000

The correct relation for $$\alpha$$, $$\beta$$ for a transistor
A
$$\beta = {{1 - \alpha } \over \alpha }$$
B
$$\beta = {\alpha \over {1 - \alpha }}$$
C
$$\alpha = {{\beta - 1} \over \beta }$$
D
$$\alpha \beta = 1$$

## Explanation

$$\beta$$ = $${{{I_C}} \over {{I_B}}}$$ = $${{{I_C}} \over {{I_E} - {I_C}}}$$ = $${{{{{I_C}} \over {{I_E}}}} \over {1 - {{{I_C}} \over {{I_E}}}}}$$ = $${\alpha \over {1 - \alpha }}$$
2

### AIPMT 2000

From the following diode circuit, which diode is in forward biased condition
A
B
C
D

## Explanation

A diode is said to be forward biased if p-type semiconductor of p-n junction is at positive potential with respect to n-type semiconductor of p-n junction. It is so for circuit (a).
3

### AIPMT 2000

The cations and anions are arranged in alternate form in
A
metallic crystal
B
ionic crystal
C
covalent crystal
D
semi-conductor crystal.

## Explanation

In an Ionic crystal, the cations and anions are arranged in alternate form.

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