Need for a Standard Unit

Q.

Which of the following cannot be used as a standard unit of measurement?

1. Human foot

2. Yard

3. Kilometre

4. Metre

Q.

Which of the following are reasons why a rod cannot be used as a standard for measuring length?

1. Its length changes with temperature

2. It corrodes with time

3. It is not easily reproducible

4. All of the above

Q.

Which of the following cannot be used as a standard of measurement?

1. Both B and C.

2. Speed of light

3. Metre

4. Human foot

Q. In ancient India, small length measurements used were an 'angul' (finger) or a mutthi (fist). People also used the length of human feet for measurements. Why did we stop using these methods?

1. Size of the body parts vary from human to human.
2. It was difficult to measure these units.
3. United Nations put a ban on these methods after Second World War.
4. Indian 'angul' or 'foot' was not considered trustworthy.

Q. The CGS unit of time is second.

1. True
2. False

Q. Volume is a derived quantity.

1. False
2. True

Q. Area is not a derived quantity.

1. True
2. False

Q.

In ancient India, small length measurements used were an 'angul' (finger) or a mutthi (fist). These methods were stopped because of the need for the standard unit.

1. Size of the body parts varies from human to human.

2. Traders requested not to use these methods.

Q. If two quantities have the same unit, then they are ______.

1. related
2. different
3. None of the above
4. same

Q. Choose the pairs that are equal.

1. 4.5 km
2. 4.5 m
3. 4500 m
4. 450 cm
5. 4.5 cm
6. 45 mm
7. 450 m
8. 45000 cm