Units and Measurement MCQ for NEET

Units and Measurement MCQ for NEET: Units and Measurement is an important topic for the NEET exam as it forms the foundation of physics. It involves understanding the basic units used to measure physical quantities like length, mass, time, and temperature. These units help us make accurate comparisons and calculations in various scientific experiments and problems. For NEET, mastering the concepts of units, conversions, and dimensions is essential since many questions are based on these topics. By practicing Units and Measurement MCQ for NEET, students can strengthen their understanding and improve their chances of scoring well in the exam.

Units and Measurement MCQ Overview

In physics, a standard unit of measurement is needed for comparison when measuring physical quantities like mass, length, and time. A unit is a defined value that acts as a reference, making it feasible to measure these amounts properly. For example, the meter is the unit of length and offers a precise reference for determining an object’s length. We calculate the number of times this standard meter fits into an object to get its length. Measurement requires this procedure of comparing a physical quantity with a recognized standard. Comprehending measurements and units is essential for competitive exams such as NEET, where questions frequently assess your proficiency with standard units and conversion techniques. We offer Units and Measurement MCQ for NEET practice questions to help boost your preparation and enhance your performance.

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Units and Measurement MCQ for NEET

1. What is the dimensional formula of velocity?
A) [M L T^-1] B) [L T^-1] C) [M L T^-2] D) [L T^-2] Answer: B) [L T^-1]

2. What is the unit of time in the CGS system?
A) Minute
B) Hour
C) Second
D) Day
Answer: C) Second

3. Which of the following physical quantities has the same unit in all systems of measurement?
A) Length
B) Time
C) Mass
D) Temperature
Answer: B) Time

4. The dimension of pressure is:
A) [M L^-1 T^-2] B) [M L T^-2] C) [M L^-2 T^-2] D) [M L^-3 T^-2] Answer: A) [M L^-1 T^-2]

5. Which of the following is an example of a derived unit?
A) Meter
B) Kilogram
C) Newton
D) Second
Answer: C) Newton

6. Which physical quantity is measured in henries (H)?
A) Magnetic flux
B) Inductance
C) Resistance
D) Capacitance
Answer: B) Inductance

7. The unit of work in the SI system is:
A) Joule
B) Newton
C) Watt
D) Pascal
Answer: A) Joule

8. Dimensional formula of energy is the same as that of:
A) Power
B) Work
C) Force
D) Pressure
Answer: B) Work

9. What is the unit of solid angle?
A) Radian
B) Steradian
C) Degree
D) Meter
Answer: B) Steradian

10. The dimensional formula of Planck’s constant is:
A) [M L^2 T^-1] B) [M L^2 T^-2] C) [M L T^-1] D) [M L T^-2] Answer: A) [M L^2 T^-1]

11. What is the SI unit of luminous intensity?
A) Candela
B) Lumen
C) Lux
D) Watt
Answer: A) Candela

12. Which of the following has the dimensional formula [M^0 L^0 T^0]?
A) Refractive Index
B) Energy
C) Force
D) Pressure
Answer: A) Refractive Index

13. One parsec is equal to how many meters?
A) 3.08 × 10^16 meters
B) 3.08 × 10^18 meters
C) 9.46 × 10^12 meters
D) 1.50 × 10^11 meters
Answer: A) 3.08 × 10^16 meters

14. Which of the following is NOT a unit of temperature?
A) Celsius
B) Kelvin
C) Fahrenheit
D) Joule
Answer: D) Joule

15. What is the dimensional formula of acceleration?
A) [L T^-1] B) [L T^-2] C) [M L T^-2] D) [M L^-1 T^-2] Answer: B) [L T^-2]

16. What is the unit of electrical resistance in the SI system?
A) Volt
B) Coulomb
C) Ohm
D) Ampere
Answer: C) Ohm

17. Which of the following is NOT a unit of power?
A) Joule
B) Watt
C) Horsepower
D) Kilowatt
Answer: A) Joule

18. If the dimensional formula of a quantity is [M L^2 T^-2], what is the physical quantity?
A) Work
B) Force
C) Energy
D) Both A and C
Answer: D) Both A and C

19. Which of the following is measured in Tesla (T)?
A) Magnetic field strength
B) Luminous intensity
C) Capacitance
D) Pressure
Answer: A) Magnetic field strength

20. What is the unit of frequency?
A) Hertz
B) Joule
C) Second
D) Newton
Answer: A) Hertz

21. The SI unit of momentum is:
A) Kilogram-meter per second
B) Newton-second
C) Both A and B
D) Meter per second
Answer: C) Both A and B

22. A copper wire of length 2 meters increases in length by 1% when heated through 5°C. If a square copper sheet of length 2 meters is heated through the same temperature difference, what will be the percentage increase in its area?
A) 2%
B) 4%
C) 8%
D) 16%
Answer: B) 4%

23. The period of oscillation of a pendulum is measured as 1.22 s, 1.30 s, 1.35 s, and 1.28 s. What is the average absolute error in the measurement?
A) 0.05 s
B) 0.07 s
C) 0.02 s
D) 0.1 s
Answer: A) 0.05 s

24. There are ten divisions on a vernier caliper’s scale, which line up with nine divisions on the main scale. If each main scale division is 1 mm, what is the least count of the vernier caliper?
A) 0.01 mm
B) 0.05 mm
C) 0.1 mm
D) 0.2 mm
Answer: B) 0.1 mm

25. A cylinder has a measured height of 5.0 cm and a diameter of 2.0 cm, both measured using instruments with a least count of 0.1 cm. What is the determined volume’s error percentage?
A) 1%
B) 2%
C) 3%
D) 4%
Answer: C) 3%

26. The length of a rod is measured as 10.0 cm using a meter scale with a least count of 0.1 cm. What is the largest measurement inaccuracy that could occur?
A) 0.1 cm
B) 0.05 cm
C) 0.2 cm
D) 0.01 cm
Answer: A) 0.1 cm

27. If the error in measuring the radius of a sphere is 2%, what will be the error in the calculated volume of the sphere?
A) 4%
B) 6%
C) 8%
D) 12%
Answer: D) 6%

28. A vernier caliper has 20 equal divisions on the vernier scale which match with 19 divisions on the main scale. If each main scale division is 1 mm, what is the least count?
A) 0.05 mm
B) 0.01 mm
C) 0.1 mm
D) 0.02 mm
Answer: A) 0.05 mm

29. A spring balance has a least count of 0.02 N. If the measured weight is 5.12 N, what is the percentage error in the measurement?
A) 0.39%
B) 0.4%
C) 0.03%
D) 0.01%
Answer: B) 0.4%

30. A simple pendulum gives the following time periods in 5 successive measurements: 2.53 s, 2.56 s, 2.54 s, 2.52 s, and 2.57 s. What is the mean absolute error in these measurements?
A) 0.01 s
B) 0.02 s
C) 0.03 s
D) 0.04 s
Answer: A) 0.01 s

31. The diameter of a sphere is measured with an error of 1%. What will be the error in the calculated surface area of the sphere?
A) 2%
B) 1%
C) 4%
D) 6%
Answer: A) 2%

32. The radius of a circular disc is measured as 14 cm with an error of 0.5%. What is the error in the calculated area of the disc?
A) 1%
B) 2%
C) 0.5%
D) 1.5%
Answer: A) 1%

33. A vernier caliper with 10 divisions on the vernier scale coinciding with 9 divisions on the main scale is used to measure a rod. If the least count of the main scale is 1 mm, what is the least count of the instrument?
A) 0.01 mm
B) 0.02 mm
C) 0.1 mm
D) 0.2 mm
Answer: C) 0.1 mm

34. A student measured the length of a rod five times, and the readings obtained are 50.2 cm, 50.4 cm, 50.1 cm, 50.3 cm, and 50.5 cm. What is the average error in the measurement?
A) 0.1 cm
B) 0.15 cm
C) 0.05 cm
D) 0.2 cm
Answer: C) 0.05 cm

35. The period of a pendulum is measured as 2.35 s, 2.36 s, 2.34 s, and 2.37 s. What is the absolute error in the first measurement?
A) 0.01 s
B) 0.03 s
C) 0.02 s
D) 0.05 s
Answer: A) 0.01 s

36. A vernier caliper has 1 mm marks on its main scale. Its vernier scale has 10 divisions, which coincide with 9 divisions of the main scale. What is the least count of the vernier caliper?
A) 0.1 mm
B) 0.01 mm
C) 0.09 mm
D) 0.02 mm
Answer: A) 0.1 mm

37. A screw gauge with a least count of 0.01 mm measures the diameter of a wire to be 2.50 mm. If the error in the measurement is ± 0.02 mm, what is the percentage error?
A) 1%
B) 0.8%
C) 0.5%
D) 0.2%
Answer: B) 0.8%

38. If the error in the radius of a cylinder is 2% and the error in its height is 1%, what is the total error in the calculated volume of the cylinder?
A) 4%
B) 5%
C) 6%
D) 2%
Answer: A) 4%

39. A stopwatch measured the time for a pendulum to complete one oscillation as 2.5 s, 2.6 s, 2.7 s, and 2.5 s. What is the mean value of the time period?
A) 2.6 s
B) 2.55 s
C) 2.57 s
D) 2.52 s
Answer: B) 2.55 s

40. The least count of a screw gauge is 0.01 mm, and it shows a reading of 5.25 mm. If the zero error is +0.02 mm, what is the corrected reading?
A) 5.27 mm
B) 5.23 mm
C) 5.28 mm
D) 5.22 mm
Answer: A) 5.27 mm

41. The mass of an object is measured as 5.0 kg with a balance that has a least count of 0.1 kg. What is the relative error in the measurement?
A) 2%
B) 1%
C) 0.5%
D) 0.2%
Answer: B) 1%

Tips for Attempting Units and Measurement MCQ for NEET

Units and Measurements is an important chapter in NEET. Mastering the basics and having a clear understanding of the concepts can make this section easier to tackle.

1. Understand SI Units: Make sure you know the standard International System of Units (SI). Focus on fundamental quantities like mass, length, time, temperature, etc.
2. Dimensional Analysis: Learn how to use dimensional analysis to check the correctness of equations and conversions between units.
3. Memorize Common Conversions: Be familiar with common unit conversions like meters to kilometers, grams to kilograms, and seconds to minutes.
4. Practice Formula Application: Understand where and how to apply formulas related to measurement errors, least count, and significant figures.
5. Learn Measurement Errors: Understand types of errors like absolute error, relative error, and percentage error. Practice questions based on these.
6. Focus on Significant Figures: Pay attention to significant figures while solving problems. NEET may ask you to choose answers based on correct rounding.
7. Solve Previous Year Papers: Practicing MCQs from past NEET papers will help you get used to the pattern and improve accuracy.