CSIR Physical Sciences: Questions 4 - 7 of 389

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Question number: 4

» Electronics and Experimental Methods » A-D and D-a Converters

Appeared in Year: 2013

MCQ▾

Question

If the analog input to an 8 – bit successive approximation ADC is increased from 1.0 V to 2.0 V, then the conversion time will – (June)

Choices

Choice (4) Response

a.

Remain unchanged

b.

Double

c.

Decrease to half its original value

d.

Increase four times

Question number: 5

» Atomic & Molecular Physics » Width of Spectrum Lines

Appeared in Year: 2013

MCQ▾

Question

Two monochromatic source, L1andL2 , emit light at 600 and 700 nm, respectively. If their frequency bandwidths are 101 and 103 GHz, respectively, then the ratio of line width of L1 to L2 is approximately – (December)

Choices

Choice (4) Response

a.

100:1

b.

1:75

c.

75:1

d.

1:85

Question number: 6

» Mathematical Methods of Physics » Linear Ordinary Differential Equations of First & Second Order

Appeared in Year: 2013

MCQ▾

Question

A planet of mass m and an angular momentum L moves in a circular orbit in a potential, V(r)=kr , where k is a constant. If it is slightly perturbed radially, the angular frequency of radial oscillation is – (June)

Choices

Choice (4) Response

a.

2mk2L3

b.

mk2L3

c.

3mk2L3

d.

mk22L3

Question number: 7

» Electronics and Experimental Methods » Digital Techniques and Applications » Registers

Appeared in Year: 2013

MCQ▾

Question

The insulation resistance R of an insulated cable is measured by connecting it in parallel with a capacitor C, a voltmeter, and battery B as shown. The voltage across the cable dropped from 150 V to 15 V, 1000 seconds after the switch S is 5μF then its insulation resistance is approximately, (June)

Circuit diagram consist of R and C

Circuit Diagram Consist of R and C

In figure the insulating resistance R of an insulated cable is measured by connecting it in parallel with a capacitor C, a voltmeter and battery B.

Choices

Choice (4) Response

a.

108Ω

b.

106Ω

c.

107Ω

d.

109Ω

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