Unit 2: Units and Measurements — Online MCQ Test
PHYSICS · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board
Practice Unit 2: Units and Measurements with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers SI units fundamental and derived units measurement of length mass and time accuracy precision errors in measurement and dimensional analysis applications..
AI-generated questions from basic to board-exam level, with instant results and explanations.
Unit 2: Units and Measurements — Important Questions & Answers
Which of the following is the SI base unit of length?
- A. metre
- B. kilometre
- C. centimetre
- D. millimetre
Answer: A. metre
The SI base unit of length is metre (m). The other options are multiples or submultiples of the metre.
The SI base unit of length is metre (m). The other options are multiples or submultiples of the metre.
How many fundamental quantities are there in the SI system used in school physics?
- A. 4
- B. 5
- C. 7
- D. 10
Answer: C. 7
The SI system has 7 fundamental quantities, such as length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
The SI system has 7 fundamental quantities, such as length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
Which of the following is the correct SI unit of force?
- A. kg m s^-2
- B. kg m^2 s^-2
- C. N m^-1
- D. m s^-1
Answer: A. kg m s^-2
Force is defined by Newton's second law, so its SI unit is kg m s^-2, which is called newton.
Force is defined by Newton's second law, so its SI unit is kg m s^-2, which is called newton.
A meter scale has least count 1 mm. If the measured length is 25.4 cm, the number of significant figures in the measurement is:
- A. 1
- B. 2
- C. 3
- D. 4
Answer: C. 3
The value 25.4 cm has three significant figures. The decimal part indicates precision up to one-tenth of a centimetre.
The value 25.4 cm has three significant figures. The decimal part indicates precision up to one-tenth of a centimetre.
Which one of the following is NOT a valid use of dimensional analysis?
- A. checking whether an equation is dimensionally homogeneous
- B. deriving a relation among physical quantities up to a constant factor
- C. finding the exact numerical value of a dimensionless constant like 2 or π
- D. converting units from one system to another
Answer: C. finding the exact numerical value of a dimensionless constant like 2 or π
Dimensional analysis cannot determine exact numerical constants such as 2 or π. It is useful for checking equations and converting units.
Dimensional analysis cannot determine exact numerical constants such as 2 or π. It is useful for checking equations and converting units.