NEET Physics: Questions 1675 - 1678 of 2099

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Question number: 1675

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

Conductivity of a semiconductor increases on doping.

Reason (Ꭱ)

On doping the temperature of the semiconductor increases.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are false
b. Ꭺ is true but Ꭱ is false
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Ꭺ is false but Ꭱ is true

Question number: 1676

» Oscillations and Waves » Resonance

MCQ▾

Question

Amplitude of a wave is represented by A=ca+bc . Then resonance will occur when

Choices

Choice (4) Response
a.

b=0&a=c

b.

b=c2

c.

b=a2

d. Question does not provide sufficient data or is vague

Question number: 1677

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

The resistivity of a semiconductor decreases with temperature.

Reason (Ꭱ)

The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing its resistivity.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
b. Ꭺ is true but Ꭱ is false
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Both Ꭺ and Ꭱ are false

Question number: 1678

» Oscillations and Waves » Simple Harmonic Motion » Phase

Assertion-Reason▾

Assertion (Ꭺ)

In simple harmonic motion, the velocity is maximum, when acceleration is minimum.

Reason (Ꭱ)

Displacement and velocity of S. H. M. differ in phase by π2

Choices

Choice (4) Response
a. Ꭺ is false but Ꭱ is true
b. Ꭺ is true but Ꭱ is false
c. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
d. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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