# Communication System-Sky and Space Wave Propagation (NEET Physics): Questions 1 - 3 of 7

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## Question number: 1

» 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: 2

» 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

## Question number: 3

» Communication System » Sky and Space Wave Propagation

MCQ▾

### Question

In a screw gauge, the zero of main scale coincides with fifth division of circular scale in figure (i). The circular divisions of screw gauge are 50. It moves 0.5 mm on main scale in one rotation. The diameter of the ball in figure (ii)

### Choices

Choice (4) Response

a.

1.25mm

b.

1.20mm

c.

1.25rnm

d.

2.20mm

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