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# Units and Measurements Class 11 MCQs Questions with Answers

**The density of a material in SI units is 128 kg m ^{-3} . In certain units in which the unit of length is 25 cm and the unit of mass is 50 g, the numerical value of density of the material is**(a) 40

(b) 16

(c) 640

(d) 410

**The damping force on an oscillator is directly proportional to the velocity. The unit of the constant of proportionality is**(a) kg-ms

^{-1}

(b) kg-ms

^{-2}

(c) kgs

^{-1}

(d) kg-s

Answer: (c) kgs-1

** Amongst the following options, which is a unit of time?**(a) Light year

(b) Parsec

(c) Year

(d) None of these

Answer: (c) Year

**Which of the following measurement is most precise?**(a) 5.00 mm

(b) 5.00 cm

(c) 5.00 m

(d) 5.00 km

Answer: (a) 5.00 mm

**The moon is observed from two diametrically opposite points A and B on earth. The angle θ subtended at the moon by the two directions of observation is 1°54′; given that the diameter of the earth to be about 1.276×10 ^{7}m. Compute the distance of the moon from the earth.**(a) 4.5x 10

^{9}m

(b) 3.83 x10

^{8}m

(c) 2.5 x 10

^{4}m

(d) 4 x10

^{7}m

Answer: (b) 3.83 x108 m

## The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

(a) proportional to the square root of the distance between the plates.

(b) linearly proportional to the distance between the plates.

(c) independent of the distance between the plates.

(d) inversely proportional to the distance between the plates.

Answer: (c) independent of the distance between the plates

## Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately

(a) spheres

(b) planes

(c) paraboloids

(d) ellipsoids

Answer: (a) spheres

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

(a) Electron microscope

(b) Vernier calliper

(c) Optical Microscope

(d) Screw gauge

Answer: (a) Electron microscope

## Which of the following is not the unit of energy?

(a) watt-hour

(b) electron-volt

(c) N × m

(d) kg × m/sec2

Answer: (d) kg × m/sec2

## 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

Answer: (c) 600

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

(a) Magnetic flux – weber

(b) Capacitance – henry

(c) Impulse – N/sec

(d) Power – farad

Answer: (a) Magnetic flux – weber

## 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

(d) added together

Answer: (c) added or substracted in the same expression

## 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 (= 0.5°), then the least count of the instrument is

(a) One minute

(b) Half minute

(c) One degree

(d) Half degree

Answer: (a) One minute

## 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

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

## 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

Answer: (a) 9192631770 periods of the cesium clock

## 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 – e2

(b) e2 + 2e2

(c) e2 + e2

(d) e2 – 2e2

Answer: (b) e2 + 2e2

The atmospheric pressure is 106 dyne/cm². What is its value in SI unit?

(a) 105 newton/m²

(b) 106 newton/m²

(c) 104 newton/m²

(d) 103 newton/m²

Answer: (a) 105 newton/m²

**If force (F), work (W) and velocity (v) are taken as fundamental quantities. What is the dimensional formula of time (T)?**(a) [WFv]

(b) [WFv

^{-1}]

(c) [W

^{-1}F

^{-1}v]

(d) [WF

^{-1}v

^{-1}]

Answer: (d) [WF-1v -1]

**The volume of a cube in m³ is equal to the surface area of the cube in m². The volume of the cube is**

(a) 64 m³

(b) 216 m³

(c) 512 m³

(d) 196 m³

Answer: (b) 216 m³

**Which of the following units denotes the dimensions [ML ^{2}/Q^{2}], where Q represents the electric charge?**

(a) Wb/m²

(b) Henry(H)

(c) H/m²

(d) Weber(Wb)

Answer: (b) Henry(H)

**What is the dimensional formula of magnetic field?**

(a) MT^{-2}A^{-1}

(b) MT^{-1}A^{-2}

(c) M^{-1}L^{-2}TA^{-1}

(d) M^{-1}LTA^{-2}

Answer: (a) MT-2A-1

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