NEET
Practice Test 10
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At absolute zero, Si acts as

  • Solution

    Semiconductors are insulators at low temperature

If a small amount of antimony is added to germanium crystal

  • Solution

    When small amount of antimony (pentavalent) is added to germanium crystal then crystal becomes n-type semiconductor. Therefore, there will be more free electrons than holes in the semiconductor.

In forward biasing of the p–n junction

  • Solution

    In forward biasing of the p-n junction,the positive terminal of the battery is connected to p-side and the negative terminal of the battery is connected to n-side. The depletion region becomes thin.

The device that can act as a complete electronic circuit is

  • Solution

    Integrated circuit can act as a complete electronic circuit.

Directions: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement 1 :If the temperature of a semiconductor is increased then it’s resistance decreases.

Statement 2 :The energy gap between conduction ban d and valence band is very small.

  • Solution

    (a)Statement -1 is true, Statement-2 is true;Statement -2 is a correct explanation for Statement-1

    In semiconductors the energy gap between conduction band and valence band is small (≈1 eV). Due to temperature rise, electron in the valence band gain thermal energy and may jumpy across the small energy gap, (to the conduction band). Thus conductivity increases and hence resistance decreases.

Directions: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement 1 :A transistor amplifier in common emitter configuration has a low input impedence.

Statement 2 :The base to emitter region is forward biased.

  • Solution

    (a)Statement -1 is true, Statement-2 is true;Statement -2 is a correct explanation for Statement-1

Directions: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement 1 :A pure semiconductor has negative temperature coefficient of resistance.

Statement 2 :Ina semiconductor on raising the temperature, more charge carriers are released, conductance in creases and resistance decreases.

  • Solution

    (a)Statement -1 is true, Statement-2 is true;Statement -2 is a correct explanation for Statement-1

    In semiconductors, by increasing temperature,covalent bond breaks and conduction hole and electrons increase.

Directions: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement 1 :Diode lasers are used as optical sources in optical communication.

Statement 2 :Diode lasers consume less energy.

  • Solution

    (c)Statement -1 is true, Statement-2 is false

    Statement - 1 is True, Statement- 2 is False

Directions: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement-1 : NOT gate is also called invertor circuit.

Statement-2 : NOT gate inverts the input order.

 

  • Solution

    (a)Statement -1 is true, Statement-2 is true;Statement -2 is a correct explanation for Statement-1

    A NOT gate puts the input condition in the opposite order, means for high input it give low output and for low input it give high output. For this reason NOT gate is known as invertor circuit.

Directions: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement-1 : When two semi conductor of p and n type are brought in contact, they form p-n junction which act like are ctifier.

Statement-2 : A rectifier is used to convent alternating current into direct current.

  • Solution

    (b)Statement -1 is true, Statement-2 is true; Statement -2 is not a correct explanation for Statement-1

    Study of junction diode characteristics shows that the junction diode offers a low resistance path, when forward biased and high resistance path when reverse biased. This feature of the junction diode enables it to be used as a rectifier.

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SEMICONDUCTOR ELECTRONICS :MATERIALS, DEVICES AND SIMPLE CIRCUITS
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