NEET Physics: Questions 401 - 403 of 2098

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Question number: 401

» 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?

Micrometer screw gauge

Micrometer Screw Gauge

Circular scale of screw gauge coincides with zero of main scale.

Choices

Choice (4) Response

a.

Can’t be said anything

b.

Positive zero error

c.

No zero error

d.

Negative zero error

Question number: 402

» 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)

 Screw Gauge – With 50 circular divisions

Screw Gauge – With 50 Circular Divisions

The zero main scale coincides with fifth division of circular scale.

Screw Gauge with Ball

Screw Gauge With Ball

Measuring diameter of the ball

Choices

Choice (4) Response

a.

1.25mm

b.

1.20mm

c.

1.25rnm

d.

2.20mm

Question number: 403

» Electrostatics » Electric Potential

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.

b.

qln24πϵ0x0

c.

q8πϵ0x0ln2

d.

0

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