**Objective Questions**

**1A. Write true or false for each statement **

**(a) **S.I. unit of temperature is Fahrenheit.

**Answer. **False

**(b) **Every measurement involves two things – a number and a unit

**Answer. **True

**(c) **Mass is the measure of quantity of matter.

**Answer. **True

**(d) **The S.I. unit of time is hour.

**Answer. **False

**(e) **The area can be expressed as the product of length of two sides.

**Answer. **True

**1B. State if the following statements are true or false. Correct the statement if it is false. **

- In ancient times, a cubit was used to measure the mass of an object.

**Answer. **False. In ancient times, a cubit was used to measure the length of an object.

- There are seven base units in the SI system.

**Answer. **True

- Second is considered as the fundamental unit of time in both CGS and MKS systems.

**Answer. **True

**‘**Centi’ means ‘a hundredth part’.

**Answer. **True

- The symbol used for a unit is always written in capital letters.

**Answer. **False. The symbol used for a unit is normally written in small letters.

**Fill in the blanks**

**(a) **The S.I. unit of length is **metre **of time is **second **of mass is **kilogram. **

**(b) **°C is the unit of **temperature. **

**(c) **1 metric tonne = **1000 kg **

**(d) **The zero mark in Celsius thermometer is the melting point of **ice **

**(e) **The thermometer used to measure the human body temperature is called the **clinical **thermometer.

**(f) **The normal temperature of human body is **37 **°C or **98.6 **°F.

**(g) **The **mass **of an object is measured with the help of a beam balance.

**Select the correct alternative**

**(a) **The symbol of degree Celsius is

**°C**- °F
- K
- °K

**(b) **10 mm is equal to

**1 cm**- 1 m
- 10 dm
- 10 cm

**(c) **The amount of surface occupied by an object is called its:

- Volume
**area**- Mass
- length

**(d) **A metre ruler is graduated in:

- m
- cm
**mm**- Km

**(e) **A thermometer is graduated in:

- Kelvin
**°C**- G
- cm