Need for a Standard Unit

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.

Discuss the significance of measurement. Give examples where you use measurements.

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.

Write the relation between an acre and hectare.

Q. What is vernier scale ?

Q. Measurements are important for life . Why ????

Q. What is 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. What is the correct formula to determine the average speed?

1. $\frac{\text{Total distance covered}}{\text{Total time taken}}$
2. $\frac{\text{Total time taken}}{\text{Total distance covered}}$
3. $\text{Total distance covered}\times \text{Total time taken}$
4. $\text{Total distance covered}+\text{Total time taken}$

Q.

Why cant a pace or a footstep be used as a measurement unit?

Q. A 'yard' is not a unit of the metric system.

1. Meter
2. Yard

Q.

Why can we not use the length of a rod as a standard unit?

1. Its length changes with temperature

2. It corrodes with time

3. It is not easily reproducible

4. It is not readily available

Q. France created a standard unit of measurement in 1790. This system of measurement was known as ____.

1. S.I. system
2. unit system
3. metric system
4. cgs system

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.

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.

Why do we need standard units of measurement?

Q. Volume is a derived quantity.

1. False
2. True

Q.

Second is the unit of time in both the CGS and MKS systems.

1. True
2. False

Q. Area is not a derived quantity.

1. True
2. False

Q.

Describe the necessity of standard unit of measurements.

Q. The CGS unit of time is second.

1. True
2. False

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

Q.

A piece of wire metre long broke into two pieces. One piece was metre long. How long is the other piece?

Q. State at least one reason for the ancient units of measurement not being used today.

Q. Early humans traveled by car

1. True
2. False

Q. Why are standard units preferred over ancient units of measurement?​

1. Ancient units are accurate.​
2. Standard units are inconvenient.​
3. Ancient units are convenient.
4. Standard units are fixed worldwide.​

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

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

Q. State at least one reason for the ancient units of measurement not being used today. $\left[2\text{marks}\right]$