NEET Physics: Questions 1665 - 1669 of 2098

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Question number: 1665

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

In a triclinic crystal system,

Choices

Choice (4) Response

a.

a=b=c,αβγ

b.

a=b=c,α=β=γ

c.

abc,αβ=γ

d.

abc,αβγ

Passage

The differential equation of a particle undergoing SHM is given by ad2xdt2+bx=0 .

The particle starts from the extreme position.

Question number: 1666 (1 of 2 Based on Passage) Show Passage

» Oscillations and Waves » Simple Harmonic Motion » Phase

MCQ▾

Question

The equation of motion may be given by:

Choices

Choice (4) Response

a.

x=Acos[ba]t

b.

x=Asin[ba]t

c.

x=Asin[bat+θ]whereθπ2

d.

Question does not provide sufficient data or is vague

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

» Oscillations and Waves » Simple Harmonic Motion » Phase

MCQ▾

Question

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

Choices

Choice (4) Response

a.

ba

b.

ab

c.

ba

d.

ab

Question number: 1668

» Electronic Devices » Semiconductor Diode

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.

3 × 10 9 m -3

b.

6 × 10 9 m -3

c.

4 × 10 9 m -3

d.

5 × 10 9 m -3

Question number: 1669

» Oscillations and Waves » Free Forced and Damped Oscillations

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) TMgcosθ=Mv2L

(2) Tcosθ=Mg

(3) The magnitude of the tangential acceleration of the bob aT =gsinθ

(4) T=Mgcosθ

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

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