Test for Units and Measurements




Introduction


Units and measurements are fundamental concepts in physics that help us quantify and understand the physical world. To gauge your understanding of this topic, here is a test consisting of multiple-choice questions (MCQs) for Class 11 students.




Test Questions


1. Which of the following is a base unit in the International System of Units (SI)?
- a) Kelvin
- b) Joule
- c) Newton
- d) Coulomb

2. The SI unit of electric current is:
- a) Ampere
- b) Volt
- c) Ohm
- d) Watt

3. The SI unit of luminous intensity is:
- a) Candela
- b) Kelvin
- c) Mole
- d) Meter

4. The dimensional formula of pressure is:
- a) MLT^-2
- b) MLT^-3
- c) ML^2T^-3
- d) ML^-1T^-2

5. The prefix "mega" represents:
- a) 10^-6
- b) 10^6
- c) 10^-3
- d) 10^3

6. The speed of light in vacuum is approximately:
- a) 3 * 10^8 m/s
- b) 3 * 10^5 m/s
- c) 3 * 10^6 m/s
- d) 3 * 10^9 m/s

7. Which of the following is a derived unit?
- a) Kelvin
- b) Ampere
- c) Mole
- d) Newton

8. The SI unit of work or energy is:
- a) Joule
- b) Watt
- c) Newton
- d) Pascal

9. The dimensional formula of angular velocity is:
- a) ML^2T^-1
- b) ML^2T^-2
- c) MLT^-1
- d) MLT^-2

10. The prefix "micro" represents:
- a) 10^6
- b) 10^-6
- c) 10^3
- d) 10^-3




Explanation


1. The base unit in the SI system is the Kelvin, which is used to measure temperature.
2. The SI unit of electric current is the Ampere, symbolized as "A."
3. The SI unit of luminous intensity is the Candela, symbolized as "cd."
4. The dimensional formula of pressure is ML^-1T^-2.
5. The prefix "mega" represents a factor of 10^6.
6. The speed of light in vacuum is approximately 3 * 10^8 m/s.
7. The derived unit is the Newton, which is a unit of force.
8. The SI unit of work or energy is the Joule, symbolized as "J."
9. The dimensional formula of angular velocity is T^-1.
10. The prefix "micro" represents a factor of 10^-6.




Conclusion


This test covers various aspects of units and measurements, including base units, derived units, prefixes, and dimensional