Question

Q1. (2x5=10)

a) What are derived units? Give one example.

b) The wavelength of light is 589 mm. Express it in:

i) Meter ii) Angstrom

c) Define the terms:

i) Amplitude ii) frequency

d) Complete the following:

i) 1 Fermi = ____ m ii) 1 Nano second = _____ S

e) Give an example of motion in which average speed is not zero but the average Velocity is zero.

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Answer 1

Question :

→ (2x + 5 = 10)

Answer :

→ 2x+5=10

→ 2x=10–5=5

→ 2x=5

→ x=5/2

→ x = 2.5

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Question :

→ What are derived units? Give one example.

Answer :

→ The SI has special names for 22 of these derived units (for example, hertz, the SI unit of measurement of frequency), but the rest merely reflect their derivation:

→ For example, the square metre (m2), the SI derived unit of area; and the kilogram per cubic metre (kg/m3 or kg⋅m−3), the SI derived unit of density.

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