NEET Physics: Questions 1647 - 1652 of 2098

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Question number: 1647

» Electronic Devices » Semiconductors

MCQ▾

Question

When a semiconductor is heated, its resistance

Choices

Choice (4) Response

a.

Increases

b.

Decreases

c.

Nothing is definite

d.

Remains unchanged

Question number: 1648

» Oscillations and Waves » Periodic Functions

MCQ▾

Question

A chimpanzee swinging on a swing in a sitting position, stands up suddenly, the time period will

Choices

Choice (4) Response

a.

Remain same

b.

Decrease

c.

Become infinite

d.

Increase

Question number: 1649

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

MCQ▾

Question

Three masses 700g, 500g, and 400g are suspended at the end of a spring are in equilibrium. When the 700g mass is removed, the system oscillates with a period of 3 seconds, when the 500 gm mass is also removed; it will oscillate with a period of,

Choices

Choice (4) Response

a.

2 s

b.

125 s

c.

1 s

d.

3 s

Question number: 1650

» Oscillations and Waves » Displacement as a Function of Time

MCQ▾

Question

The maximum velocity and the maximum acceleration of a body moving in a simple harmonic oscillator are 2 m/s and 6 m/s 2. Then angular velocity will be

Choices

Choice (4) Response

a.

2rads

b.

1rads

c.

0.5rads

d.

3rads

Question number: 1651

» Oscillations and Waves » Simple Pendulum

MCQ▾

Question

A simple pendulum is executing simple harmonic motion with a time period . If the length of the pendulum is increased by 21%, the percentage increase in the time period of the pendulum of is,

Choices

Choice (4) Response

a.

21%

b.

50%

c.

30%

d.

10%

Question number: 1652

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

We can measure the potential barrier of a PN junction by putting a sensitive voltmeter across its terminals.

Reason (Ꭱ)

The current through the PN junction is not same in forward and reversed bias.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is true but Ꭱ is false

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