30 Questions
What is a physical quantity?
A quantity that can be measured and explained in terms of laws.
What is a fundamental quantity?
A quantity that is independent of other quantities.
What is a vector quantity?
A quantity that has both magnitude and direction.
What is a derived quantity?
A quantity that is derived from fundamental quantities.
What is an example of a derived quantity?
Area
When refractive index is defined as Velocity of light in air/Velocity of light in medium, what does it imply about the velocity of light?
Velocity of light in air can be greater or less than in medium
Which of the following is a derived quantity if speed and time are chosen as fundamental quantities?
Length
A scalar quantity can have a negative:
Sign
Strain is a measure of:
Change in dimension per unit original dimension
What is the minimum number of fundamental quantities required to express all other quantities in mechanics?
Three
What is the fundamental unit of mass in the CGS system?
gram
Which system of units uses foot, pound, and second as fundamental units?
FPS system
What is the unit of force in the FPS system?
poundal
What is the standard unit of length in the CGS system?
centimetre
Which of the following is a fundamental quantity in the MKS system?
Mass
What is the unit of length in the CGS system?
Centimeter
What is the prefix for 10^-6 in the S.I. system?
Micro
What is the fundamental unit of time in the MKS system?
Second
Which of the following is a unit of mass in the MKS system?
Kilogram
What is the unit of length in the FPS system?
Foot
What was the initial definition of the unit of time, the second, based on?
Rotation of the earth around the sun and its axis
What is the relationship between the least count of a screw gauge and the accuracy of measurement?
Smaller the least count, higher is the accuracy
What is a characteristic of a physical quantity that remains constant?
The product of the numerical value and the unit
What is the effect of changing the unit of measurement on the significant figures of a physical quantity?
The significant figures remain the same
What is a characteristic of a repetitive phenomenon that can be used to measure time?
Any of the above repetitive phenomena
What is the equivalent value of 1 fermi in terms of meters?
10^(-10) m
What is the mass of an electron in terms of kilograms?
9.1 × 10^(-25) kg
What is the equivalent value of 1 angstrom in terms of meters?
10^(-10) m
What is the value of 1 Chandra Shekhar unit in terms of kilograms?
2.8 × 10^(11) kg
What is the equivalent value of 1 year in terms of time?
The time taken by the Earth to complete 1 revolution around the Sun in its orbit
Test your understanding of physical quantities, units, and measurements in physics. Learn about fundamental and derived quantities, vector quantities, and more.
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