NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1680 - 1684 of 2184

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Question number: 1680

» Oscillations and Waves » Periodic Motion - Period Frequency

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MCQ▾

Question

The kinetic energy of a particle executing S. H. M. is 16 J when it is in its mean position. If the amplitude of oscillations is 25 cm and the mass of the particle is 5.12 kg, the time period of its oscillation is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1681

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

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MCQ▾

Question

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then the short piece will have a force constant of

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1682

» Electronic Devices » Semiconductors

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MCQ▾

Question

The energy gap for diamond is nearly

Choices

Choice (4) Response

a.

1 eV

b.

4 eV

c.

6 eV

d.

2 eV

Question number: 1683

» Electronic Devices » Semiconductors

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MCQ▾

Question

The intrinsic semiconductor becomes an insulator at

Choices

Choice (4) Response

a.

0°C

b.

300 K

c.

0 K

d.

-100°C

Question number: 1684

» Electronic Devices » Semiconductor Diode

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MCQ▾

Question

A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be wrong statements?

(1) Resistance of each Increase

(2) Resistance of each Decrease

(3) Resistance of copper increases while that of germanium decreases

(4) Resistance of copper decreases while that of germanium increases

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

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1,2 and 3 are correct

d.

1 and 3 are correct