NEET Physics: Questions 1678 - 1683 of 2098

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Question number: 1678

» Oscillations and Waves » Simple Pendulum

Assertion-Reason▾

Assertion (Ꭺ)

The percentage change in time period is 1.5 % if the length of simple pendulum increases by 3

Reason (Ꭱ)

Time period is directly proportional to length of pendulum

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 1679

» Oscillations and Waves » Periodic Motion - Period Frequency

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.

5πsec

b.

2πsec

c.

20πsec

d.

π5sec

Question number: 1680

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

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.

6k

b.

(23)k

c.

3k

d.

(32)k

Question number: 1681

» Electronic Devices » Semiconductors

MCQ▾

Question

The energy gap for diamond is nearly

Choices

Choice (4) Response

a.

2 eV

b.

1 eV

c.

6 eV

d.

4 eV

Question number: 1682

» Electronic Devices » Semiconductors

MCQ▾

Question

The intrinsic semiconductor becomes an insulator at

Choices

Choice (4) Response

a.

-100°C

b.

0 K

c.

0°C

d.

300 K

Question number: 1683

» Electronic Devices » Semiconductor Diode

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 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1, 2 and 3 are correct

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