Question

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Answer 1

Explanation:

1

Physical quantity is any physical property than can be measured using numbers.

Two types:-

Fundamental and derived quantities

2.

Length

Mass

Time

Electric Current

3.

Length- the distance between two points.

Meter - It is the standard unit to measure the length between two points or to measure the length of an object.

Standard unit - A unit which is accepted and used by majority or lot of people and used for measurement.

4.

Millimeter scale as thickness is very small which can't be measured on Centimeter scale.

5.

Total length of coil = 3.7 *40

= 148 cm

Now, length of coil = circumference of coil

So,

Circumference of coil = pi × d

$148 = \frac{22}{7} \times d$

$\frac{148 \times 7}{22} = d$

d = 47.1

(I am not sure about this question)

5.

B is the correct eye who is recording correct measurement.

A eye's magnitude is 12.3 CM

C eye's magnitude is 11.6 CM

Hope it helps