NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1590 - 1594 of 2142

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Question number: 1590

» Electronic Devices » Semiconductors

MCQ▾

Question

The energy band gap of Si is

Choices

Choice (4) Response

a.

0.70 eV

b.

1.1 eV

c.

Between 0.70 eV

d.

5eV

Question number: 1591

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

The temperature coefficient of resistance is positive for p-type semiconductors and negative for n-type semiconductors.

Reason (Ꭱ)

The effective charge carries in p-type semiconductors and holes and in n-type semiconductors are electrons.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 1592

» Oscillations and Waves » Simple Harmonic Motion » Oscillations of a Spring

MCQ▾

Question

Three masses 600g, 300g, and 200g are suspended at the end of a spring are in equilibrium. When the 600g mass is removed, the system oscillates with a period of 4 seconds, when the 300 gm mass is also removed, it will oscillate with a period of

Choices

Choice (4) Response

a.

2.53 s

b.

1 s

c.

2 s

d.

Question number: 1593

» Oscillations and Waves » Periodic Motion - Period Frequency

MCQ▾

Question

The periodic time of a body executing simple harmonic motion is 3 sec. After how much time from time t = 0, its displacement will be half of its amplitude

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1594

» Oscillations and Waves » Simple Harmonic Motion » Oscillations of a Spring

MCQ▾

Question

A spring having a spring constant k is loaded with a mass m. The spring is cut into two equal parts and one of these is loaded again with the same mass. The new spring constant is,

Choices

Choice (4) Response

a.

b.

c.

k

d.

f Page
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