# Communication System (NEET (NTA)-National Eligibility cum Entrance Test (Medical) 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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