Objective Chemistry Question.(1)

1) SI unit of time is

1. Second
2. Minute
3. Hour
4. Day

2) SI unit of mass is

1. Gram
2. Kilogram
3. Pound
4. None

3) SI unit of length is

1. Angstrom
2. Millimeter
3. Metre
4. Kilometre

4) SI unit of temperature is

1. Centrigrade
2. Fahrenheit
3. Absolute
4. Kelvin

5) A microgram is written as

1. 10³g
2. 10⁶g
3. 10^-6g
4. 10^-3g

6) Given the numbers : 161 cm, 0 . 161 cm, 0.0161 cm. The number of significant figures for the three numbers is

1. 3,4 and 5 respectively
2. 3,3 and 3 respectively
3. 3, 3 and 4 respectively
4. 3, 4 and 4 respectively

7) Derive SI unit of area is

1. Cm²
2. Cm³
3. M²
4. M³

8) A substance which cant't be future decomposed by ordinary chemical means is

1. Water
2. Air
3. Sugar
4. Silver

9) Which of following processes is a chemical change ?

1. Dissolution of common salt in water
2. Heating a platinum wire
3. Dissolution of sodium metal in water
4. Heating of water

10) Which one is a physical change ?

1. Burning of S in air
2. Burning of S in air
3. Conversion of which phosphorus to red phosphorus
4. Corrosion of metals