AIIMS Physics: Questions 416 - 421 of 500

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Question number: 416

» Magnetic Effects of Current and Magnetism » Cyclotron

MCQ▾

Question

The cyclotron frequency of an electron gyrating in a magnetic field of 2 T is approximately –

Choices

Choice (4) Response

a.

560 MHz

b.

56 GHz

c.

56 Hz

d.

5.6 GHz

Question number: 417

» Electrostatics » Capacitors

MCQ▾

Question

Minimum number of 10µF and 200 V capacitors used to make a combination of 14µF and 1000 V are:

Choices

Choice (4) Response

a.

10

b.

16

c.

7

d.

12

Question number: 418

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

In short wave communication waves of which of the following frequencies will be reflected back by the ionosphere layer having electron density 108 per m3?

Choices

Choice (4) Response

a.

9 KHz

b.

90 KHz

c.

45 KHz

d.

4.5 KHz

Question number: 419

» Kinematics » Motion in a Plane

MCQ▾

Question

A particle moves in xy – plane such that its position is given by x=3t2,y=12t . Velocity and acceleration at time t=1sec are respectively –

Choices

Choice (4) Response

a.

65ms,3ms2

b.

65ms,6ms2

c.

6ms,3ms2

d.

63ms,2ms2

Question number: 420

» Electrostatics » Capacitors

MCQ▾

Question

125 drops of liquid are combined to form a bigger single drop. The capacitance of single small drop and single big drop will be in ratio –

Choices

Choice (4) Response

a.

1: 5

b.

1: 25

c.

25: 1

d.

5: 1

Question number: 421

» Oscillations and Waves » Speed of a Wave

MCQ▾

Question

The velocities of sound at the same pressure in two monatomic gases of densities ρ1 and ρ2 are V1 and V2 respectively. If V1V2=5 , then the value of ρ1ρ2

Choices

Choice (4) Response

a.

5

b.

125

c.

25

d.

15

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