V&E-Test-2

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Quiz System
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Question 1:

Which option below is the base unit used for measuring the quantity of a substance?





Topic: SI Base Units - Measurement of Substance Quantity

Correct Answer: C) Mole

Short Hint:
  • The base unit is a simple, definitive unit of measure in a particular system.
  • In the International System of Units (SI), the mole is the base unit for measuring the amount of a substance.
  • Therefore, the answer to the question is C, Mole.

Question 2:

Identify the quantity from the options below that do not possess a dimension.





Topic: Dimensional Analysis - Dimensionless Quantities

Correct Answer: D) Engine Efficiency

Short Hint:
  • A dimensional quantity can be measured in terms of the fundamental quantities.
  • Engine Efficiency is a dimensionless quantity as it is the ratio of output power to input power, both measured in the same units.
  • Thus, the answer is D, Engine Efficiency.

Question 3:

Which of the following is an example of a base quantity?





Topic: Units of Measurement - Base Quantities

Correct Answer: B) Light-Year

Short Hint:
  • Base quantities are those that cannot be derived from other quantities and have their unique unit of measurement.
  • A Light-Year pertains to the distance covered by light in a single year, and it is measured in meters, which is a base unit.
  • Hence, the correct choice is B, Light-Year.

Question 4:

What are the dimensions of Torque from the given options?





Topic: Dimensions of Physical Quantities - Torque

Correct Answer: C) ML2T-2

Short Hint:
  • The dimensions of physical quantities can be expressed in terms of base quantities like Mass (M), Length (L), and Time (T).
  • The dimensions of Torque, as well as Work, happen to be ML2T-2.
  • Therefore, the accurate answer is C, ML2T-2.

Question 5:

From the number 90005, how many significant figures can be identified?





Topic: Significant Figures in Measurements

Correct Answer: C) Five

Short Hint:
  • Significant figures include all digits 1-9, and any zero that is sandwiched between two non-zero digits.
  • The number 90005 consists of five digits, all of which are either non-zero or between non-zero numbers.
  • Therefore, the number 90005 has five significant figures, making C the correct answer.

Question 6:

Which one from the following options is classified as a derived unit?





Topic: SI Units - Base vs Derived Units

Correct Answer: C) Newton

Short Hint:
  • Derived units are made up from base units according to the physical quantity.
  • All the options except Newton are base units in the International System of Units (SI).
  • Therefore, the answer to the question is C, Newton, which is a derived unit.

Question 7:

Among the listed options, to which value is one dyne equivalent?





Topic: Unit Conversions - Force Units

Correct Answer: A) 10-5 N

Short Hint:
  • Dyne is the CGS (centimeter-gram-second) unit of force.
  • The relationship between dyne and the SI unit of force (Newton) is such that 1 dyne equals 10-5 N in SI units.
  • Thus, the correct answer is A, 10-5 N.

Question 8:

What does a Light-Year primarily measure?





Topic: Astronomical Measurements - Units of Distance

Correct Answer: C) Distance

Short Hint:
  • Astronomical distances are measured in Light-Years.
  • It is defined as the total distance that light can travel in one year.
  • Therefore, the correct answer is C, Distance.

Question 9:

What are the dimensions of the Viscosity Coefficient from the given options?





Topic: Fluid Mechanics - Viscosity Coefficient Dimensions

Correct Answer: C) [ML-1T-1]

Short Hint:
  • The formula for the Viscosity Coefficient is expressed in terms of mass (M), length (L), and time (T).
  • Therefore, the dimensional representation of the Viscosity Coefficient is [ML-1T-1].
  • Hence, the correct answer is C, [ML-1T-1].

Question 10:

How many supplementary units exist according to standard conventions?





Topic: SI Units - Supplementary Units

Correct Answer: A) Two

Short Hint:
  • Supplementary units are additional units used in certain fields of study.
  • In the SI system, there are two supplementary units: the Radian and the Steradian.
  • Therefore, the correct answer is A, Two.

Question 11:

What happens to uncertainties during the multiplication or division of measurements?





Topic: Error Analysis - Multiplication and Division of Uncertainties

Correct Answer: A) The percentage uncertainties are added together.

Short Hint:
  • Uncertainty is an expression of the degree to which a value is known.
  • During the multiplication and division of measurements, the percentage uncertainties are added together.
  • This makes option A, The percentage uncertainties are added together, the correct answer.

Question 12:

Which option best describes the absolute uncertainty?





Topic: Measurement Uncertainty - Absolute Uncertainty

Correct Answer: B) It is equivalent to the least count of the measuring instrument.

Short Hint:
  • Absolute uncertainty is an estimate of the uncertainty of a measurement.
  • It is defined as the least count of the measuring instrument.
  • So, the correct answer is B, It is equivalent to the least count of the measuring instrument.

Question 13:

Which unit is recognized as the SI unit for plane angle?





Topic: SI Units - Plane Angle Measurement

Correct Answer: B) Radian

Short Hint:
  • The standard unit used to measure plane angle in the International System of Units (SI) is the radian.
  • Steradian is the SI unit used for solid angle measurements.
  • Thus, the correct answer is B, Radian.

Question 14:

Out of the following, which is the largest unit for measuring plane angle?





Topic: Units of Plane Angle

Correct Answer: B) Revolution

Short Hint:
  • Plane angles can be measured in several units, including radians, degrees, and revolutions.
  • Of these units, a revolution is the largest.
  • Hence, the correct answer is B, Revolution.

Question 15:

Identify the SI unit of Energy from the following options.





Topic: SI Units of Energy

Correct Answer: B) Joule

Short Hint:
  • Energy is measured in Joules.
  • Joule is the standard unit used for quantifying work or energy in scientific contexts.
  • Accordingly, the correct answer is B, Joule.

Question 16:

What characterizes an accurate measurement?





Topic: Measurement Accuracy and Uncertainty

Correct Answer: D) It has minimal percentage uncertainty.

Short Hint:
  • Accuracy in measurement refers to the close proximity of the measurement to the actual value.
  • An accurate measurement is often characterized by having minimal percentage uncertainty, meaning that the discrepancy between the measured value and the true value is very small in relation to the measurement.
  • Thus, the correct answer is D, It has minimal percentage uncertainty.

Question 17:

What quantity is represented by the unit Rad/s?





Topic: Angular Kinematics - Angular Velocity

Correct Answer: B) Angular velocity

Short Hint:
  • Rad/s is a unit that denotes how an angle changes with time, which is the definition of angular velocity.
  • Therefore, the correct answer is B, Angular velocity.

Question 18:

Choose the correct base units for the gravitational constant G.





Topic: Gravitational Constant - Units and Dimensions

Correct Answer: B) kg-1m3s-2

Short Hint:
  • The gravitational constant (G) features in Newton's law of gravitation and its units can be derived as kg-1m3s-2.
  • Therefore, the correct answer is B, kg-1m3s-2.

Question 19:

What are the dimensions of half-life?





Topic: Radioactive Decay - Half-Life

Correct Answer: C) T

Short Hint:
  • Half-life represents the time taken for a quantity to reduce to half its initial value.
  • Therefore, it has the dimension of time (T).
  • Thus, the correct answer is C, T.

Question 20:

Which among the following is the smallest sub-multiple?





Topic: SI Prefixes - Sub-multiples

Correct Answer: C) Atto

Short Hint:
  • Sub-multiples denote small quantities, with atto being the smallest among the options.
  • It's represented as 1 atto = 10-18.
  • Hence, the correct answer is C, Atto.
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