NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1667 - 1671 of 2184

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Passage

The differential equation of a particle undergoing SHM is given by .

The particle starts from the extreme position.

Question number: 1667 (1 of 2 Based on Passage) Show Passage

» Oscillations and Waves » Simple Harmonic Motion » Phase

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MCQ▾

Question

The ratio of the maximum acceleration to the maximum velocity of the particle is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1668 (2 of 2 Based on Passage) Show Passage

» Oscillations and Waves » Simple Harmonic Motion » Phase

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MCQ▾

Question

The equation of motion may be given by:

Choices

Choice (4) Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

Question number: 1669

» Electronic Devices » Semiconductor Diode

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MCQ▾

Question

Pure silicon has equal electron and holes concentration of 1.5 × 10 16 m -3. Doping by indium increases holes concentration to 4.5 × 10 22 m -3. The electron concentration in the doped silicon is,

Choices

Choice (4) Response

a.

5 × 10 9 m -3

b.

4 × 10 9 m -3

c.

3 × 10 9 m -3

d.

6 × 10 9 m -3

Question number: 1670

» Oscillations and Waves » Free Forced and Damped Oscillations

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MCQ▾

Question

A simple pendulum of length L and mass (bob) M is oscillating in a plane about a vertical line between angular limits – ϕ and + ϕ. For an angular displacement θ (| θ| < ϕ), the tension in the string and the velocity of the bob are T and v respectively. The following relations hold good under the above conditions.

(1)

(2)

(3) The magnitude of the tangential acceleration of the bob

(4)

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1,2 and 3 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct

Question number: 1671

» Electronic Devices » Semiconductor Diode

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The number of electrons in a P-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.

Reason (Ꭱ)

It is due to law of mass action.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false