**1) What Are the Units of Time? Explain the Relationship Among the Units of Time.**

- The units of time are hours, minutes and seconds.
- The relation among the units of time is as follows-
- 60 seconds is equal to 1 minute.
- 60 minutes is equal to 1 hour.
- 1 hour is equal to 3600 seconds.

**2) What is metrology?**

- Metrology is the study of measurement scientifically.
- Metrology helps us to understand different quantities and their units.

**3) What Is Acceleration, and How Do We Measure It?**

- The rate of change of velocity per unit of time is called acceleration. An increase in speed characterises an accelerated object.
- Velocity can be defined as the displacement of an object per unit of time.
- The formula of acceleration is change in velocity ∕ Time.
- The unit of acceleration is m ∕ s2

**4) What Is the Difference Between C.G.S. and F.P.S. Systems?**

The difference between C.G.S. and F.P.S. systems are following-

C.G.S. system | F.P.S. system |
---|---|

1. In this system, centimetre, gram, and second are the length, mass, and time units, respectively. | 1. In this system, foot, pound, and second are the length, mass, and time units, respectively. |

2. This system is known as the French system of units. | 2. This system is also known as the British system of units. |

**5) **

**This Is a Badminton Court. Find Out This Court’s Perimeter and Area and Mention the Units Properly.**

- This badminton court is a rectangle as its length is longer than its width.
- The perimeter of a rectangle can be calculated using the formulae 2 (L + W)
- Hence the perimeter of this badminton court is equal to 2 ( 50 + 30) metres =
**140 metres**. - The area of a rectangle can be calculated using the formulae L X W.
- Hence the area of this badminton court is equal to 50 X 30 m2 =
**1500 m2**

**6) What Is the Relation Between 1 Metre and 1 Kilometre?**

The relation between 1 metre and 1 kilometre is as follows:

1metre = 0.001 kilometre or

1 kilometre = 1000 metre

**7) How Do People Use To Measure Time in the Past?**

- In the past, people used to measure time with the help of egg timers.
- An egg timer is a sealed glass container with a narrow neck in the middle.
- Egg-timers are filled with sand, which flows through the narrow neck from top to bottom when the container is inverted.
- The duration for the complete transfer of sand from the upper part to the lower part denoted a certain period of time.

**8) What Is the Difference Between 1 Kilometre and 1 Mile?**

- Kilometres and miles are both units of length.
- Mile is a bigger unit as compared to the kilometre.
- One mile equals 1609.34 metres, whereas 1 km equals 1000 m.

**9) Define Calibration**

- The act of marking units on an instrument is called calibration.
- It is done to take accurate measurements.
- This process minimises the occurrence of errors while taking measurements.

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