11th Physics MCQs Preparation 2022 and Onwards (Unit:  Measurements : Set-5 (50 MCQs)) for National MDCAT, ECAT, FPSC, PPSC, JOB Exam, Physics Lecturer, SSC, HSSC (F.Sc.), BS, MS Exams NTS, ETS ETc..



151. A precise measurement is one that has:




... Answer is A. Less absolute uncertainty
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152. Random error can be reduced by?




... Answer is C. Taking the mean of several measurements
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153. The time of 30 vibrations of a simple pendulum is 54.6 s by a stopwatch whose least count is 0.1 s. the time period can be written as:




... Answer is C. 1.82 ± 0.003
Time period = (54.6 ± 0.1)/ 30 = 1.82 ± 0.003


154. Resistance is calculated by the formula R = V/I is 6.2 ohms with 8% uncertainty. Then the result in ohms will be:




... Answer is D. 6.2 ± 0.5
8% of 6.2 = 0.5


155.  The number of significant figures in the measurement was recorded as 8.70 × 10⁴ ?




... Answer is A. 3
According to the rules of significant figures.


156. Zero error belongs to the category of:




... Answer is C. Instrumental errors
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157. A digit zero in a measurement? :




... Answer is A. May be significant may not significant
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158. Absolute uncertainty in a measurement depends upon?




... Answer is B. Least count of the instrument
Least count and absolute Uncertainty are the same things


159. Error in measurement may occur due to




... Answer is D. All of these reasons
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160. The error in measurement may occur due to?




... Answer is D. All of these reasons
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161. Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to?




... Answer is A. Sum of their absolute uncertainties
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162. The relative error in the measurement of the side of a cube is 0.027. The relative error in the measurement of its volume is




... Answer is C. 0.081
V = L³ = (0.027)³ = 3((0.027) = 0.081


163. The error occurs due to negligence and inexperience of a person is:




... Answer is C. Personal Error
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164.  If length = 0.233 m and width = 0.178 m, the most accurate area expressed space of significant figures is:




... Answer is A. 0.041 m²
The answer should be up to the Lowest Decimal places in the given numbers


165. The addition of three masses 1.6 g, 7.32 g, and 4.238 g, addressed upto proper decimal places is




... Answer is B. 13.2 g
Given: The answer should be up to the Lowest Decimal places in the given numbers


166.. Which of the following pairs has the same dimensions?




... Answer is B. Impulse and Momentum
F🛆t = mv


167. The dimensions of Kinetic energy are same as that of :




... Answer is C. Work
Work and Energy are the same thing (Fd = 1/2 mv²)


168. Which of the following quantities do not have the same dimensions? is:




... Answer is B. Tension and surface tension
Tension is a force while surface tension is force per unit length hence their dimensions are not the same. So, Both have different dimension formulas. While the other three options have the same dimension formula.


169. Which of the two has same dimensions?




... Answer is C. Angular velocity and frequency
Both Angular velocity and frequency have the same dimensional Formula as [M°L° T⁻¹].


170. [M°L°T°] are dimension of




... Answer is D. All of these
[M°L°T°] is used for dimensionless quantities. So, the correct option is option D. because strain, refractive index, and magnification are ratios of same quantity So having no dimension (no units)

171. Which equation is not dimensionally correct?




... Answer is C. S=Vt²
Incorrect formula


172. Which pair has the same dimension?




... Answer is D. All are correct
Option A,B,C are quantities of the same dimensional formula.


173. Which one is the dimensionally correct equation?




... Answer is B. S=Vit + ½ at²
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174. Which of the following is dimensionally different?




... Answer is B. Specific heat
Work and Energy have the same dimension of [L M² T⁻²], while specific heat has [M° L² T⁻² K⁻¹].


175.  The Dimension [M°LM°] represents




... Answer is C. Length
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176. The dimension of work is




... Answer is A. [ML²T⁻²]
W = Fd


177. The equation of state of some gases can be expressed as Vander wal equation i.e.(P + a/v2)(V – b) = RT Where P is the pressure, V is the volume, T is the absolute temperature and a, b, R are constants. The dimensions of ‘a’ are: :




... Answer is D. [ML⁵T⁻²]
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178. The dimensions of torque are




... Answer is A. [ML²T⁻²]
--Torque T = r x F Dimension of length r = [L], Dimension of Force = [MLT⁻²], thus dimension of Torque = [L] x [ML¹T⁻²] = [ML²T⁻²]


179. M¹L⁻¹T⁻² is the dimension of?




... Answer is B. Pressure
-----P =F/A


180. The dimension of `\sqrt frac {l}{g}` is same as that of:




... Answer is B. Time
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181. The dimensions of frequency f are.




... Answer is B. [T⁻¹]
f =1/T



182. The dimension of the coefficient of viscosity is:



... Answer is C. [ML⁻¹T⁻¹]
F=6πηrv


183. The dimension of density is




... Answer is C. [ML⁻³]
p = m / V


184. Which one is the dimension of strain?




... Answer is C. [M⁰ L⁰ T⁰]
Strain is a ratio = ΔL/L and has no unit so dimensionless quantity.


185.  Dimensional analysis is helpful for?



... Answer is C. 0.5 mm
 Max Error = Least Count / 2


186. The dimensional formula for Planck’s constant is




... Answer is B. [ML²T⁻¹]
h = E/v


187. Angular momentum has the same dimensions as: :




... Answer is C. Plank's constant
Angular Momentum and Plank's constant both have the dimension as [ML²T⁻¹]


188. The ratio of the dimensions of Planck’s constant to that of the moment of inertia has a dimension of:




... Answer is B. Frequency
-[ML²T⁻¹]/[ML²] = [T⁻¹] = frequency


189. Which of the following is a dimensional constant?




... Answer is B. Speed of light
The speed of light is constant and has a unit also


190. Which of the following is a dimensional variable?




... Answer is A. Moment of inertia
The magnitude of the Moment of inertia is variable


191. Which of the following has the dimension of [ML²T⁻²]




... Answer is B. Heat energy
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192. The dimensions of acceleration due to gravity




... Answer is B. [LT⁻²]
The dimension of g = [m][s⁻²] = [LT⁻²]


193. Planck constant has the same dimensions as that of:




... Answer is D. Angular momentum
Angular Momentum and Plank's constant both have the dimension as [ML²T⁻¹]


194. [M⁰L⁰T⁻¹] refers to




... Answer is A. Frequency
Frequency is reciprocal of the time period ( f = 1/T)


195.  `\sqrt frac{F ｘL}{m}`has the same dimension as:




... Answer is B. Velocity
`\sqrt frac{F ｘ L}{m}` = `\sqrt frac{MLT⁻² ｘ L}{M}` = `\sqrt {L²T⁻²}` = L¹T⁻¹, which if the dimension of velocity


196. The dimensional formula [ML²T⁻³] is more closely associated with:




... Answer is A. Power
P =F/A


197. Dimension of refractive index is :




... Answer is A. [M° L° T°]
Refractive Index is a ratio, has no units and NO dimensions, and [M° L° T°] represents dimensionless quantities


198. The dimensional formula of lightyear is:




... Answer is D. [L]
---------Light year is the unit of distance


199. The dimension of angular velocity is:




... Answer is A. [T⁻¹]
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200. Which dimensions will be the same as that of time?




... Answer is C. L / R
L = R Δt (where L is inductance and R is resistance)



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Or 

Select from the below Links for HSSC-I (Class-11) :  Physics MCQS Preparation


1. Unit:  Measurements: Set-1 (32 MCQs), Set-2 (50 MCQs), Set-3 (50 MCQs),                                   Set-4 (50 MCQs),   Set-5 (50 MCQs),  

2. Unit:  Vectors and Equilibrium: Set-1 (34 MCQs), 

3. Unit:  Force and Motion: Set-1 (34 MCQs), 

4. Unit:  Work and Energy: Set-1 (29 MCQs), 

5. Unit:  Rotational and Circular Motion: Set-1 (31 MCQs), 

6. Unit:  Fluid Mechanics or Dynamics: Set-1 (31 MCQs), 

7. Unit:  Oscillations : Set-1 (27 MCQs), 

8. Unit:  Waves : Set-1 (27 MCQs), 

9. Unit:  Physical Optics : Set-1 (27 MCQs), 

10. Unit:  Thermodynamics: Set-1 (34 MCQs),  

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