Page 131 - Science Class 06

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i In ancient times, people used cubits, steps, palm, etc. to measure length.
i Early Babylonains and Egyptians were the first who started measuring length with forearm,
hand and fingers.
i The reference standard of measurement is called unit.
i The General Conference of Weight and Measures (GCWM) introduced a single practical
system, the International System of Unit or SI unit in 1960.

i SI unit of length is metre.

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A. Tick ( ) the correct op on. 3
1. Which of the following was not an unit of measurement of length?
(a) Cubit (b) Span
(c) Palm (d) Stomach
2. How many cen metres are there in 5 metres?

(a) 50 cm (b) 500 cm
(c) 5000 cm (d) 5 m
3. One light year is equal to:
(a) 9.451 × 10¹⁵ m (b) 1.501 × 10¹⁵ m

(c) 8.982 × 10¹² m (d) 9.461 × 10¹⁵ m
4. SI unit of length is:
(a) Metre (b) Kilometre

(c) Cen metre (d) All of them
5. Movement of a pendulum is an example of:
(a) rotatory mo on (b) oscillatory mo on
(c) rec linear mo on (d) curvilinear mo on

6. Rota on of the earth on its axis is an example of:
(a) periodic mo on (b) non-periodic mo on
(c) curvilinear mo on (d) rotatory mo on
B. Fill in the blanks.

1. _____________ and _____________ were the first who started measuring the length with
forearm, hand and finger.
2. The _____________ is the unit of distance used to measure the length between two
heavenly bodies.
3. Movement of a body along a curved line is called _____________ mo on.
4. Mo on of a top is an example of _____________ mo on.
5. To measure speed, area and volume, we need to know the _________________ or
_____________.

Science-6 131