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Units and Measurements Quiz

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Units and Measurements Quiz

shape Introduction

What is a Physical Quantity ?
A Physical Quantity is a physical property of a material that can be quantified/estimated/determined by measurement and can be communicated/expressed/represented by a number. A physical quantity can be expressed as the combination of a magnitude expressed by a number – usually a real number followed by a unit. Example: Length of the pole is 5 mts. The Temperature of the water is -3 degrees Celsius. Physical Quantity is a physical property that can be measured using numbers and hence it can be quantified. The article Units and Measurements Quiz assists the students in learning about Units & Measurements in the quiz format.
What is meant by Unit?
A Unit is a single entity, a magnitude that represents an independent whole. A unit of measurement is a definitive or determinate quantity adopted as a standard of measurement, by comparison with which any other quantity of the same kind is measured or estimated. Example: Mass is a physical quantity. The kilogram is a unit of mass that represents a definite predetermined mass. When we say 5 kilograms (or 5 kg), it actually signifies 5 times the definite predetermined mass called "kilogram". .
What is meant by Measurement?
“Measurement” is the act of determining a target's size, length, weight, capacity, or other aspect. There are a number of terms similar to “measure” but which vary according to the purpose (such as “weight,” “calculate,” and “quantify.”) In general, Measurement can be understood as a process of determining how big or small a physical quantity is as compared to a basic reference quantity of the same kind.”

shape Quiz

1. Young’s modulus of a material has the same unit as

    A. pressure B. strain C. compressibility D. force

Answer: Option A
2. Unit of magnetic moment is

    A. ampere – [latex]meter ^ 2[/latex] B. ampere–meter C. weber – [latex]meter ^ 2[/latex] D. weber/meter

Answer: Option A
3. Unit of moment of inertia in MKS system is

    A. kg x [latex]cm ^ 2[/latex] B. kg / [latex]cm ^ 2[/latex] C. kg x [latex]m ^ 2[/latex] D. joule × m

Answer: Option C
4. The nuclear cross-section is measured in barn, it is equal to

    A. [latex]{10^{-20}}[/latex] [latex]{m^2}[/latex] B. [latex]{10^{-30}}[/latex] [latex]{m^2}[/latex] C. [latex]{10^{-28}}[/latex] [latex]{m^2}[/latex] D. [latex]{10^{-14}}[/latex] [latex]{m^2}[/latex]

Answer: Option C
5. Universal time is based on

    A. rotation of the earth on its axis B. earth’s orbital motion around the sun C. vibrations of cesium atom D. oscillations of quartz crystal

Answer: Option C
6. Which relation is wrong?

    A. 1 calorie = 4.18 joule B. 1Å = [latex]{10^{-10}}m[/latex] C. 1 MeV = 1.6 × [latex]{10^{-13}} Joule[/latex] D. 1 newton = [latex]{10^{-5}}Dyne[/latex]

Answer: Option D
7. Number of fundamental units in SI system is?

    A. 4 B. 1Å = 7 C. 1 MeV = 3 D. 1 newton = 5

Answer: Option B
8. Unit of surface tension is?

    A. [latex]N{m^{-1}}[/latex] B. [latex]N{m^{-2}}[/latex] C. [latex]N^2{m^{-1}}[/latex] D. [latex]N{m^{-3}}[/latex]

Answer: Option A
9. One second is defined to be equal to?

    A. 1650763.73 periods of the Krypton clock B. 652189.63 periods of the Krypton clock C. 1650763.73 periods of the Cesium clock D. 9192631770 periods of the Cesium clock

Answer: Option D
10. One [latex]Wb{m^2}[/latex] = ?

    A. [latex]{10^4}[/latex] gauss B. 4 [latex]{10^3}[/latex] gauss C. [latex]{10^2}[/latex] gauss D. [latex]{10^{-4}}[/latex] gauss

Answer: Option A
1. The dimensions of electric potential are :

    A. [M[latex]{L^2}[/latex][latex]{T^2}[/latex][latex]{Q^{-1}}[/latex]] B. [ML[latex]{T^2}[/latex][latex]{Q^{-1}}[/latex]] C. [M[latex]{L^2}[/latex][latex]{T^{-1}}[/latex]Q] D. [M[latex]{L^2}[/latex][latex]{T^{-2}}[/latex]Q]

Answer: Option A
2. The dimensions of electrical permitivity are

    A. [[latex]{A^2}[/latex][latex]{M^{-1}}[/latex][latex]{L^{-3}}[/latex] [latex]T^4[/latex]] B. [[latex]{A^2}[/latex][latex]{M^{-1}}[/latex][latex]{L^{-3}}[/latex] [latex]T^0[/latex]] C. [A[latex]{M^{-1}}[/latex][latex]{L^{-3}}[/latex][latex]T^4[/latex] ] D. [[latex]{A^2}[/latex][latex]{M^0}[/latex][latex]{L^{-3}}[/latex] [latex]T^4[/latex]]

Answer: Option A
3. The dimensions of Reynolds constant are

    A. [[latex]M^0[/latex][latex]L^0[/latex][latex]{L^{-3}}[/latex] [latex]T^0[/latex]] B. [M [latex]L^{-1}[/latex][latex]{T^{-1}}[/latex]] C. [M [latex]L^{-1}[/latex][latex]{T^{-2}}[/latex]] D. [M [latex]L^{-2}[/latex][latex]{T^{-2}}[/latex]]

Answer: Option A
4. The dimensional formula for angular momentum is

    A. [[latex]M^0[/latex][latex]L^2[/latex][latex]{T^{-2}}[/latex] ] B. [M [latex]L^2[/latex][latex]{T^{-1}}[/latex]] C. [M L[latex]{T^{-1}}[/latex]] D. [M [latex]L^2[/latex][latex]{T^{-2}}[/latex]]

Answer: Option B
5. The dimensional formula of torque is

    A. [M[latex]L^2[/latex][latex]{T^{-2}}[/latex]] B. [M L[latex]{T^{-2}}[/latex]] C. [M [latex]L^{-1}[/latex]L[latex]{T^{-1}}[/latex]] D. [M [latex]L^{-2}[/latex][latex]{T^{-2}}[/latex]]

Answer: Option A
6. The dimensional formula of pressure is

    A. [M[latex]L^2[/latex][latex]{T^{-2}}[/latex] ] B. [M L[latex]{T^{-2}}[/latex]] C. [M [latex]L^{-1}[/latex]L[latex]{T^{-2}}[/latex]] D. [M L[latex]T^2[/latex]]

Answer: Option C
7. The dimensional formula for permeability μ is given by

    A. [ML[latex]{T^{-2}}[/latex][latex]{A^{-2}}[/latex] ] B. [M L[latex]{T^{-2}}[/latex]] C. [M [latex]L^{-1}[/latex]L[latex]{T^{-2}}[/latex]] D. [M L[latex]T^2[/latex]]

Answer: Option A
8. The dimensions of gravitational constant G are

    A. [ML[latex]{T^{-2}}[/latex]] B. [M[latex] L ^3[/latex][latex]{T^{-2}}[/latex]] C. [M [latex]L^{-1}[/latex][latex]{T^{-2}}[/latex]] D. [[latex]{M^{-1}}[/latex][latex] L ^3[/latex] [latex]{T^{-2}}[/latex]]

Answer: Option C
9. Which of the following is a dimensional constant?

    A. Refractive index B. Poissons ratio C. Strain D. Gravitational constant

Answer: Option D
10. The force F on a sphere of radius a moving in a medium with velocity v is given by F = 6 phav. The dimensions of h are?

    A. [M[latex] {L^{-3}}[/latex]] B. [M[latex] {L ^{-2}}[/latex]] C. [M[latex] {L ^{-1}}[/latex]] D. [M[latex] {L ^{-1}}[/latex] [latex]{T ^{-1}}[/latex]]

Answer: Option D
1. The dimensions of Planck’s constant are same as

    A. energy B. power C. momentum D. angular momentum

Answer: Option D
2. If L denotes the inductance of an inductor through which a current i is flowing, the dimensions of L [latex] i ^2[/latex] are

    A. [M[latex] L ^2[/latex] [latex]{T ^{-2}}[/latex]] B. [ML[latex]{T ^{-2}}[/latex]] C. [[latex]M ^2[/latex][latex]L ^2[/latex] [latex]{T ^{-2}}[/latex]] D. Not expressible e in M, L, T

Answer: Option A
3. The dimensions of potential energy are

    A. [M L [latex]{T ^{-1}}[/latex]] B. [M[latex]L ^2[/latex][latex]{T ^{-2}}[/latex]] C. [M[latex]{L ^{-1}}[/latex][latex]{T ^{-2}}[/latex]] D. [M[latex]{L ^{-1}}[/latex][latex]{T ^{-2}}[/latex]]

Answer: Option B
4. The dimensions of shear modulus are

    A. [M L [latex]{T ^{-1}}[/latex]] B. [M[latex]L ^2[/latex][latex]{T ^{-2}}[/latex]] C. [M[latex]{L ^{-1}}[/latex][latex]{T ^{-2}}[/latex]] D. [M L [latex]{T ^{-2}}[/latex]]

Answer: Option C
5. Dimensions of 1/[latex]μ_{0}[/latex][latex]c_{0}[/latex], where symbols have their usual meaning, are

    A. [[latex]M^0[/latex] [latex]{L^{-1}}[/latex]T] B. [[latex]M^0[/latex] [latex]{L^{-2}}[/latex][latex]T^2[/latex]] C. [[latex]M^0[/latex] [latex]L^2[/latex][latex]T^2[/latex]] D. [[latex]M^0[/latex] L[latex]{T^{-1}}[/latex]]

Answer: Option C
6. If the dimensions of a physical quantity are given by [latex]M^a[/latex][latex]L^b [/latex] [latex]T^c[/latex] then the physical quantity will be

    A. velocity if a = 1, b = 0, c = – 1 B. acceleration if a = 1, b = 1, c = – 2 C. force if a = 0, b = – 1, c = – 2 D. pressure if a = 1, b = – 1, c = – 2

Answer: Option D
7. The unit of the Stefan-Boltzmann's constant is

    A. W[latex]m^2[/latex] [latex]K^4[/latex] B. W[latex]m^2[/latex] C. W[latex]m^2[/latex]K D. pressure if a = 1, b = – 1, c = – 2

Answer: Option A
8. The unit of permittivity of free space, [latex]ϵ_{0}[/latex] is

    A. [latex]coulomb^2[/latex] /[latex]newton - metre^2[/latex] B. coulomb / metre C. newton - [latex]metre^2[/latex] D. [latex]coulomb^2[/latex] / [latex]newton - metre^2[/latex]

Answer: Option D
9. Unit of Stefan’s constant is

    A. J[latex]s^{-1}[/latex] B. J[latex]m^{-2}[/latex] [latex]s^{-1}[/latex] [latex]k^{-4}[/latex] C. J[latex]m^{-2}[/latex] D. Js

Answer: Option B
10. Unit of self inductance is

    A. [latex]\frac{Newton - Second}{coulomb - ampere}[/latex] B. [latex]\frac{(Joule /coulomb) (second)}{ampere}[/latex] C. [latex]\frac{(volt ) (metre)}{coulomb}[/latex] D. [latex]\frac{(Newton) (metre)}{ampere}[/latex]

Answer: Option B
1. The unit of absolute permittivity is

    A. Fm (farad-metre) B. Fm C. momentum D. angular momentum

Answer: Option C
2. The dimensional formula for magnetic flux is

    A. [M[latex]L^{2}[/latex] [latex]T^{-2}[/latex] [latex]A^{-1}[/latex]] B. [M[latex]L^{3}[/latex] [latex]T^{-2}[/latex] [latex]A^{-2}[/latex]] C. [[latex]M^{0}[/latex][latex]L^{-2}[/latex] [latex]T^{2}[/latex] [latex]A^{-2}[/latex]] D. [M[latex]L^{2}[/latex] [latex]T^{-1}[/latex] [latex]A^{2}[/latex]]

Answer: Option B
3. Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, length L, time T and current I, would be

    A. [M[latex]L^{2}[/latex] [latex]T^{-2}[/latex]] B. [M[latex]L^{2}[/latex] [latex]T^{-1}[/latex] [latex]I^{-1}[/latex] C. [M[latex]L^{2}[/latex] [latex]T^{-3}[/latex] [latex]A^{2}[/latex]] D. [M[latex]L^{2}[/latex] [latex]T^{-3}[/latex] [latex]I^{-1}[/latex]

Answer: Option C
4. The dimensions of k in the equation w = 1/2[latex] k x^{2}[/latex]

    A. [M[latex]L^{0}[/latex] [latex]T^{-2}[/latex]] B. [[latex]M^{0}[/latex]L [latex]T^{-1}[/latex]] C. [ML [latex]T^{-1}[/latex]] D. [M[latex]L^{0}[/latex] [latex]T^{-1}[/latex]]

Answer: Option A
5. Dimensions of capacitance are

    A. [[latex]M^{-1}[/latex][latex]L^{-2}[/latex][latex]T^{4}[/latex] [latex]A^{2}[/latex]] B. [ML[latex]T^{-3}[/latex] [latex]A^{-1}[/latex]] C. [M[latex]L^{2}[/latex][latex]T^{3}[/latex] [latex]A^{-1}[/latex]] D. [[latex]M^{-1}[/latex][latex]L^{-2}[/latex][latex]T^{4}[/latex] [latex]T^{3}[/latex] [latex]A^{2}[/latex]]

Answer: Option A
6. If L, C, and R denote the inductance, capacitance and resistance respectively, the dimensional formula for [latex]C^{2}[/latex]LR is

    A. [M[latex]L^{2}[/latex] [latex]T^{-1}[/latex] [latex]I^{0}[/latex]] B. [[latex]M^{0}[/latex][latex]L^{0}[/latex] [latex]T^{3}[/latex] [latex]I^{0}[/latex]] C. [[latex]M^{-1}[/latex][latex]L^{-2}[/latex] [latex]T^{6}[/latex] [latex]I^{2}[/latex]] D. [[latex]M^{0}[/latex][latex]L^{0}[/latex] [latex]T^{0}[/latex] [latex]I^{0}[/latex]]

Answer: Option B
7. In the relation x = cos (ωt + kx) , the dimension(s) of w is/are

    A. [[latex]M^{0}[/latex]LT B. [[latex]M^{0}[/latex][latex]L^{-1}[/latex] [latex]T^{0}[/latex] C. [[latex]M^{0}[/latex] [latex]L^{0}[/latex] [latex]T^{-1}[/latex]] D. [latex]M^{0}[/latex] L [latex]T^{-1}[/latex]

Answer: Option C
8. The dimensions of coefficient of self inductance are

    A. [M[latex]L^{2}[/latex] [latex]T^{-2}[/latex] [latex]A^{-2}[/latex]] B. [M[latex]L^{2}[/latex] [latex]T^{-2}[/latex] [latex]A^{-2}[/latex]] C. [ML[latex]T^{-2}[/latex] [latex]A^{-2}[/latex]] D. [ML[latex]T^{-2}[/latex] [latex]A^{-1}[/latex]]

Answer: Option A
9. Which one of the following represents the correct dimensions of the coefficient of viscosity?

    A. [M[latex]L^{-1}[/latex][latex]T^{-1}[/latex] ] B. [ML[latex]T^{-1}[/latex] ] C. [M[latex]L^{-1}[/latex][latex]T^{-2}[/latex] ] D. [M[latex]L^{-2}[/latex][latex]T^{-2}[/latex] ]

Answer: Option D
10. Out of the following pair , which one does not have identical dimensions?

    A. Impulse and momentum B. Angular momentum and Planck's constant C. Work and torque D. Moment of inertia and moment of a force

Answer: Option D
1. The dimensions of magnetic field in M, L, T and C (coulomb) is given as

    A. [ML[latex]T^{-1}[/latex] [latex]C^{-1}[/latex] ] B. [M[latex]T^{2}[/latex] [latex]C^{-2}[/latex] ] C. [M[latex]T^{-1}[/latex] [latex]C^{-1}[/latex] ] D. [ML[latex]T^{2}[/latex] [latex]C^{-1}[/latex] ]

Answer: Option C
2. If L, C and R represent inductance, capacitance and resistance respectively, then which of the following does not represent dimensions of frequency?

    A. [latex]\frac{1}{RC}[/latex] B. [latex]\frac{R}{L}[/latex] C. 1[latex]\sqrt {LC}[/latex] D. [latex]\frac{C}{L}[/latex]

Answer: Option D
3. Light year is a unit of

    A. time B. distance C. sunlight intensity D. mass

Answer: Option B electric field) are
4. A cube has a side of length 1.2 × [latex]10^{-2}[/latex] m. Calculate its volume

    A. 1.7 × [latex]10^{-6}[/latex][latex]m^{3}[/latex] B. 1.73 [latex]10^{-6}[/latex][latex]m^{3}[/latex] C. 1.70 [latex]10^{-6}[/latex][latex]m^{3}[/latex] D. 1.732 × [latex]10^{-6}[/latex][latex]m^{3}[/latex]

Answer: Option A
5. Let [latex]{ϵ}_{0}[/latex] denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = time and A = electric current, then:

    A. [latex]{ϵ}_{0}[/latex] = [[latex]M^{-1}[/latex] [latex]L^{-3}[/latex] [latex]T^{2}[/latex] A ] B. [latex]{ϵ}_{0}[/latex] = [[latex]M^{-1}[/latex] [latex]L^{-3}[/latex] [latex]T^{4}[/latex] [latex]A^{2}[/latex] ] C. [latex]{ϵ}_{0}[/latex] = [[latex]M^{1}[/latex] [latex]L^{2}[/latex] [latex]T^{1}[/latex] [latex]A^{2}[/latex] ] D. [latex]{ϵ}_{0}[/latex] = [[latex]M^{1}[/latex] [latex]L^{2}[/latex] [latex]T^{1}[/latex] A ]

Answer: Option B
6. If length of pendulum is increased by 2%. The time period will

    A. Increases by 1% B. Decreases by 1% C. Increases by 2% D. Decreases by 2%

Answer: Option A
7. Which of the following pairs has the same dimensions?

    A. Specific Heat and Latent Heat B. Impulse and Momentum C. Surface Tension and Force D. Moment of Inertia and Torque

Answer: Option B
8. Which of the following is a possible dimensionless quantity?

    A. Velocity gradient B. Pressure gradient C. Displacement gradient D. Force gradient

Answer: Option C
9. The dimensional formula of couple

    A. [M [latex]L^{-2}[/latex] [latex]T^{-2}[/latex] A ] B. [M L [latex]T^{-1}[/latex] ] C. [[latex]{M}_{1}[/latex] [latex]{L}_{1}[/latex] [latex]T^{-1}[/latex]] D. [[latex]{M}_{1}[/latex] [latex]{L}_{1}[/latex] [latex]T^{-1}[/latex]]

Answer: Option A
0. On the basis of dimensional equation, the maximum number of unknown that can be found, is

    A. one B. two C. three D. four

Answer: Option C
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