Measurement MCQs for MDCAT Practice

Physics section, Measurement chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

1. Question 1
   The only pakistani scientist who recieved noble prize in physcis is
   • AProf. Abdus Salam (correct answer)
   • BDr. Munir Ahmed
   • CDr. Abdul Qadeer Khan
   • DDr. Munir Ahmed Khan
   Correct answer: A

   Tests knowledge of Pakistani Nobel laureates in Physics, specifically Prof. Abdus Salam's recognition.
2. Question 2
   The multiplication product of 20.21 with 20.22 upto four significant figures is
   • A408.6 (correct answer)
   • B408.64
   • C408.6462
   • D409.0
   Correct answer: A

   Master significant figures in multiplication: calculate precisely, then round to the least number of sig figs in the original numbers.
3. Question 3
   Which expression could be correct for the velocity v of ocean waves in terms of p the density of seawater, g the acceleration of free fall, h the depth of the ocean and λ the wavelength?
   • A√gλ (correct answer)
   • B√g/h
   • C√pgh
   • D√g/p
   Correct answer: A

   This question tests dimensional analysis to determine the correct formula for ocean wave velocity based on physical quantities.
4. Question 4
   The systematic error may occur due to: I. Zero error of an instrument. II. Poor calibration of an instrument. III. Incorrect measurement technique
   • AI only
   • BI and II only (correct answer)
   • CII only
   • DII and III only
   Correct answer: B

   Systematic errors in measurements stem from consistent biases, often due to instrument flaws like zero error or poor calibration, not random technique variations.
5. Question 5
   A value for the acceleration of free fall on Earth is given as (10+-2) m s-2. Which statement is correct?
   • AThe value is accurate but not precise (correct answer)
   • BThe value is both accurate and precise.
   • CThe value is neither precise nor accurate.
   • DThe value is precise but not accurate.
   Correct answer: A

   This question tests the understanding of accuracy vs. precision in measurements, crucial for interpreting experimental data in Physics.
6. Question 6
   The dimensions of velocity are:
   • ALT
   • BLT-1 (correct answer)
   • CLT-2
   • DL2T-1
   Correct answer: B

   Velocity's dimensions (LT⁻¹) are derived from its definition as displacement over time, a fundamental concept in kinematics.
7. Question 7
   In an experiment the width w and the thickness x of a metre rule to be measured as precisely as possible using normal laboratory apparatus which combination of instruments is most appropriate for these measurements?
   • AA. Vernier calipers for both width and thickness (correct answer)
   • BB. Ruler for width and micrometer for thickness
   • CC. Micrometer for width and ruler for thickness
   • DD. Ruler for both width and thickness
   Correct answer: A

   Choosing the right instrument for precise measurement is key. Vernier calipers offer superior precision for small dimensions like width and thickness compared to rulers or micrometers in this context.
8. Question 8
   In the SI system of units, the fundamental units of length, mass, and time are ____, _____ and _____ respectively:
   • AMeter, Kilogram, and Kilo second
   • BKilometre, Kilogram, and Hour
   • CMeter, Kilogram, and Second (correct answer)
   • DCentimetre, Centigram, and Second
   Correct answer: C

   Master the SI system! This question tests your knowledge of the three fundamental units for length, mass, and time: meter, kilogram, and second.

Read the full Measurement chapter notes: Measurement notes. Or browse every chapter.