Welcome to Units and Measurement NEET MCQ, your essential guide to mastering the fundamentals of units and measurements! In this comprehensive collection of multiple-choice questions (MCQs), each question is thoughtfully accompanied by both the correct answer and a detailed explanation. Designed specifically for NEET (National Eligibility-cum-Entrance Test) preparation, these MCQs serve as a powerful tool to not only test your knowledge of units and measurements but also to provide you with a thorough understanding of the subject.
1. Which of the following is the SI unit of force?
Answer:
Explanation:
The SI (System International) unit of force is the Newton (N).
2. How many significant figures are in the number 0.005600?
Answer:
Explanation:
The significant figures in the number are 5, 6, and 0 after the 6.
3. What is the unit of luminous intensity in the SI system?
Answer:
Explanation:
The SI unit for luminous intensity is Candela.
4. 1 micron is equal to:
Answer:
Explanation:
1 micron is equivalent to 10^-6 meters.
5. The dimensional formula for gravitational constant (G) is:
Answer:
Explanation:
Dimension of G is [M^-1 L^3 T^-2].
6. Which is a scalar quantity?
Answer:
Explanation:
Mass is a scalar as it has magnitude only without direction.
7. The number of significant figures in 0.06900 is:
Answer:
Explanation:
The significant figures are 6, 9, and the two zeroes after 9.
8. If the actual length of an object is 4.5 cm and the measured length is 5.0 cm, the relative error is:
Answer:
Explanation:
Relative error = (Measured value – Actual value) / Actual value = (5.0 – 4.5) / 4.5 = 0.11.
9. The unit of Planck's constant is:
Answer:
Explanation:
Planck's constant (h) has a unit of Joule second (Js).
10. Which is a fundamental unit?
Answer:
Explanation:
Kelvin is a fundamental unit representing temperature.
11. Parsec is a unit of:
Answer:
Explanation:
Parsec is a unit of astronomical distance.
12. One atmospheric pressure is equal to:
Answer:
Explanation:
One atmospheric pressure is equivalent to 760 mm of mercury column.
13. The dimensions of impulse are equivalent to:
Answer:
Explanation:
Impulse and momentum both have dimensions [MLT^-1].
14. Light year is a unit of:
Answer:
Explanation:
A light year is the distance light travels in one year.
15. The number 0.00678 rounded off to three significant figures is:
Answer:
Explanation:
Rounding off to three significant figures, the number becomes 0.0068.