# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 402 - 404 of 2320

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## Question number: 402

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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.

Positive zero error

b.

Can’t be said anything

c.

No zero error

d.

Negative zero error

## Question number: 403

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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.

1.20mm

b.

2.20mm

c.

1.25mm

d.

1.25rnm

## Question number: 404

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MCQ▾

### Question

Identical point charges, each having +q charge, are fixed at each of the points x = x 0 , x = 3x 0 , x = 5x 0 ……… infinite, on the x-axis and an identical point charges, each having -q charge, are fixed at each of the points x = 2x 0 , x = 4x 0 , x = 6x 0 ……. infinite. Here x 0 is a positive constant. Potential at the origin due to the above system of charges is,

### Choices

Choice (4)Response

a.

0

b.

c.

d.

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