9th class Chemistry, Chapter 12: Empirical Data Collection and Analysis MCQs

1. Which of the following pairs of quantities may be measured in the same unit?

1. (A) Heat and temperature
2. (B) Temperature and area
3. (C) Heat and work ✓
4. (D) Length and work

2. In which unit we usually measure the energy present in the food?

1. (A) Kilojoules ✓
2. (B) Megajoules
3. (C) Calorie
4. (D) Joule

3. What prefix is used for 10⁻¹²?

1. (A) Mega
2. (B) Pico ✓
3. (C) Giga
4. (D) Tessa

4. In SI unit of pressure is expressed in:

1. (A) Newton per metre
2. (B) Newton per metre square
3. (C) Joule
4. (D) Pascal ✓

5. Which symbol is used for kilogram in SI units?

1. (A) K (capital)
2. (B) k (small)
3. (C) Kgm
4. (D) kg ✓

6. What does a mole represent?

1. (A) Number ✓
2. (B) Mass
3. (C) Volume
4. (D) Length

7. Which unit of volume should usually be used in Chemistry?

1. (A) Millilitre
2. (B) Litre
3. (C) Cubic centimetre ✓
4. (D) Cubic metre

8. Express 0.000840 in scientific notation:

1. (A) 8.40 × 10⁻³
2. (B) 840 × 10⁻⁶
3. (C) 8.40 × 10⁻⁴ ✓
4. (D) 84.0 × 10⁻⁵

9. In SI units prefix nano means:

1. (A) 10⁻⁹ ✓
2. (B) 10⁻⁸
3. (C) 10⁻¹¹
4. (D) 10⁻¹²

10. 65 °C is equivalent to:

1. (A) 208 K
2. (B) 338 K ✓
3. (C) 403 K
4. (D) 300 K

11. SI stands for:

1. (A) Simple Instrument
2. (B) System International (International System of Units) ✓
3. (C) Standard Index
4. (D) Scientific Information

12. SI units use the base:

1. (A) 60
2. (B) 10 ✓
3. (C) 2
4. (D) 12

13. CGS system stands for:

1. (A) Centimetre-gram-second ✓
2. (B) Coulomb-gram-second
3. (C) Centimetre-gas-system
4. (D) Celsius-gram-second

14. The number of base units in the SI system is:

1. (A) Five
2. (B) Three
3. (C) Twenty-two
4. (D) Seven ✓

15. Out of the base SI units, the number used in Chemistry is:

1. (A) Three
2. (B) Two
3. (C) Five ✓
4. (D) Seven

16. One kilogram is also defined as the mass of:

1. (A) 1000 cm³ of water ✓
2. (B) 100 cm³ of water
3. (C) 1 cm³ of water
4. (D) 1 m³ of water

17. The second is defined using radiation of the atom of:

1. (A) Caesium-133 ✓
2. (B) Carbon-12
3. (C) Hydrogen-1
4. (D) Uranium-238

18. The SI unit of temperature is:

1. (A) Fahrenheit
2. (B) Joule
3. (C) Kelvin ✓
4. (D) Celsius

19. The kelvin is 1/273.16 of the thermodynamic temperature of the:

1. (A) Boiling point of water
2. (B) Freezing point of mercury
3. (C) Melting point of ice at 2 atm
4. (D) Triple point of water ✓

20. The symbol of mole is:

1. (A) m
2. (B) Mo
3. (C) ml
4. (D) mol ✓