AIIMS Physics: Questions 396 - 401 of 500

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Question number: 396

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

MCQ▾

Question

If vibrations of a string are to be increased to a factor of four, then tension in the string must be made –

Choices

Choice (4) Response

a.

Eight times

b.

Sixteen times

c.

Four times

d.

Ten times

Question number: 397

» Oscillations and Waves » Simple Harmonic Motion » Energy

MCQ▾

Question

In simplest terms, the energy of a wave is directly proportional to the square of its –

Choices

Choice (4) Response

a.

Refraction

b.

Length

c.

Reflection

d.

Height

Question number: 398

» Electrostatics » Capacitors

MCQ▾

Question

What is the area of the plate of a 2F parallel plate capacitor, if the separation between the plates is 3 mm?

Choices

Choice (4) Response

a.

0.554×109m2

b.

1.200×109m2

c.

0.677×109m2

d.

1.918×109m2

Question number: 399

» Properties of Solids & Liquids » Viscosity

MCQ▾

Question

The rate of flow of a liquid through a capillary tube of radius r is V when the pressure difference across the two ends of the capillary is P. If pressure is increased by 6P and radius is reduced to r3 then the rate of flow becomes,

Choices

Choice (4) Response

a.

2V27

b.

V9

c.

V27

d.

2V9

Question number: 400

» Magnetic Effects of Current and Magnetism » Cyclotron

MCQ▾

Question

The cyclotron frequency of an electron gyrating in a magnetic field of 5 T is approximately –

Choices

Choice (4) Response

a.

280 GHz

b.

140 GHz

c.

28 Hz

d.

160 MHz

Question number: 401

» Electronic Devices » Junction Transistor

MCQ▾

Question

Consider an N – P – N transistor amplifier in common-emitter configuration. The current gain of the transistor is 90. If the collector current changes by 2 mA, what will be the change in emitter current –

Choices

Choice (4) Response

a.

1.01mA

b.

2.2 mA

c.

2.02 mA

d.

0.2 mA

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