# MCQ for Class 11 Physics Chapter 2 Units and Measurements with answer

MCQ for Class 11 Physics Chapter 2 : MCQs for Class 11 Physics Chapter 2 Units and Measurements with Answers PDF Free Download prepared here according to the latest CBSE RBSE and Other State Board syllabus and NCERT Books.

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## MCQ for Class 11 Physics Chapter 2 Units and Measurements with answer

Q1. Out of the following pairs, which one does not have identical dimensions ?

(a) Angular momentum and Planckâ€™s constant
(b) Impulse and momentum
(c) Moment of inertia and moment of a force
(d) Work and torque

(c) Moment of inertia and moment of a force

Q2. Which of the following physical quantities has different dimensions?

(a) Energy
(b) Watt hour
(c) Momentum
(d) Work

(c) Momentum

Q3. Identify the pair whose dimensions are equal.

(a) Torque and work
(b) Stress and energy
(c) Force and stress
(d) Force and work

(a) Torque and work

Q4. Dimensions cannot be used to

(a) check dimensional correctness of a formula
(b) convert units
(c) find value of the constant of proportionality in an equation
(d) deduce a relation among physical quantities

(c) find value of the constant of proportionality in an equation

Q5. Two physical quantities whose dimensions are not same, cannot be :

(a) multiplied with each other
(b) divided
(c) added or substracted in the same expression

(c) added or substracted in the same expression

Q6. A student measures the distance covered and time taken by a body under free fall which was intially at rest. He uses this data for estimating g, the acceleration due to gravity. If the maximum percentage error in measurement of the distance and the time are e1 and e2 respectively, then the maximum possible percentage error in the estimation of g is

(a) e2 â€“ e2
(b) e2 + 2e2
(c) e2 + e2
(d) e2 â€“ 2e2

(b) e2 + 2e2

Q7. The number of significant figures in the distance of one light year , 9.4605 Ã— 1015 m is

(a) thirty
(b) five
(c) four
(d) three

(b) five

Q8. The most suitable instrument for measuring the size of an atom is.

(a) Electron microscope
(b) Vernier calliper
(c) Optical Microscope
(d) Screw gauge

(a) Electron microscope

Q9. In case of measurement of â€˜gâ€™, if error in measurement of length of pendulum is 2%, the percentage error in time period is1 %. The maximum error in measurement of g is

(a) 1 %
(b) 2 %
(c) 4 %
(d) No error

(c) 4 %

Q10. The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 Ã— 10â€“3 are

(a) 5, 1, 2
(b) 4, 4, 2
(c) 5, 1, 5
(d) 5, 5, 2

(a) 5, 1, 2

Q11. Choose the correct statement(s)

(a) Topological sort can be used to obtain an evaluation order of a depending graph.
(b) Evaluation order for a dependency graph dicates the order in which the semantic rules are done
(c) Code generation is independent of the order in which the semantic actions are performed
(d) Both (a) and (b)

(d) Both (a) and (b)

Q12. What is the number of significant figures in 0.310Ã—103 ?

(a) 6
(b) 2
(c) 4
(d) 3

(d) 3

Q13. Which of the following is not the unit of energy?

(a) watt-hour
(b) electron-volt
(c) N Ã— m
(d) kg Ã— m/sec2

(d) kg Ã— m/sec2

Q14. In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (= 0.5Â°), then the least count of the instrument is

(a) One minute
(b) Half minute
(c) One degree
(d) Half degree

(a) One minute

Q15. Electron volt is a unit of

(a) Potential difference
(b) Electric current
(c) Electronic charge
(d) Energy

(d) Energy

Q16. A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are the path of the particle makes with the x-axis an angle of

(a) 300
(b) 450
(c) 600
(d) 0

(c) 600

Q17. Resolution is

(a) a measure of the bias in the instrument
(b) None of these
(c) the smallest amount of input signal change that the instrument can detect reliably
(d) a measure of the systematic errors

(d) a measure of the systematic errors

Q18. Absolute error of the measurement is

(a) the difference between the individual measurement and the true value of the quantity cubed.
(b) the difference between the individual measurement and the true value of the quantity squared.
(c) the difference between two individual measurements and their mean
(d) the difference between the individual measurement and the true value of the quantity

(a) the difference between the individual measurement and the true value of the quantity cubed.

Q19. Which of the following units denotes the dimensions [ML2/Q2], where Q represents the electric charge?

(a) Wb/mÂ²
(b) Henry(H)
(c) H/mÂ²
(d) Weber(Wb)

(b) Henry(H)

Q20. Light year is a unit of

(a) time
(b) distance
(c) sunlight intensity
(d) mass

(b) distance

Q21. Which one of the following pairs of quantities and their units is a proper match?

(a) Magnetic flux â€“ weber
(b) Capacitance â€“ henry
(c) Impulse â€“ N/sec

(a) Magnetic flux â€“ weber

Q22. One second is defined to be equal to

(a) 9192631770 periods of the cesium clock
(b) 1650763.73 periods of the cesium clock
(c) 652189.63 periods of the krypton clock
(d) 1650763.73 periods of the krypton clock

(a) 9192631770 periods of the cesium clock

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