Communication System (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 5 - 8 of 42

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Question number: 5

» Communication System » Need for Modulation

MCQ▾

Question

The acceleration due to gravity at a place can be determined with the help of a simple pendulum. For this purpose effective length of the pendulum is considered. If ′ be the length of the string and ‘d’ the diameter of the bob then the effective length is equal to

Choices

Choice (4) Response

a.

l + d

b.

c.

l-d

d.

Question number: 6

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

Two full turns of the circular scale of a screw gauge cover a distance of 1mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found

that the screw gauge has a zero error of - 0.03 mm. While measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular

scale divisions in line with the main scale as 35. The I diameter of the wire is

Choices

Choice (4) Response

a.

3.32 mm

b.

3.67 mm

c.

3.73 mm

d.

3.38 mm

Question number: 7

» Communication System » Bandwidth of Signals

MCQ▾

Question

What is the function of a screw gauge in the experiment of determining Young’s modulus of a wire?

Choices

Choice (4) Response

a.

It measures the length of the wire.

b.

It measures the diameter of the wire.

c.

It measures the extension in the wire.

d.

Question number: 8

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

When the zero of the circular scale of a screw gauge coincides with the zero of the main scale before A and B come in contact then the instrument has which type of error?

Choices

Choice (4) Response

a.

Can’t be said anything

b.

Positive zero error

c.

No zero error

d.

Negative zero error

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