Physics — Class 11 — Chapter 1: Units and Measurements

Question 1+4

The dimensional formula of pressure is:

$[M\,L^{-1}\,T^{-2}]$ $[M\,L\,T^{-2}]$ $[M\,L^{2}\,T^{-2}]$ $[M\,L^{-1}\,T^{-1}]$

Question 2+4

Which of the following pairs has the same dimensions?

Work and Power Impulse and Momentum Force and Energy Pressure and Force

Question 3+4

The number of significant figures in $0.00340$ is:

6 5 3 2

Question 4+4

For $Z=\dfrac{A^{2}B}{\sqrt{C}}$, the percentage errors in $A,B,C$ are $1\%,2\%,4\%$. The percentage error in $Z$ is ___ %.

Question 5+4

The dimensional formula $[M\,L^{2}\,T^{-2}]$ represents:

Force Power Work / Energy Pressure

Question 6+4

Which of the following is a dimensionless quantity?

Strain Force Velocity Density

Question 7+4

The sum $24.36+0.0623+256.2$, to the correct number of decimal places, is ___ (numerical value).

Question 8+4

Which quantity–SI unit pair is NOT correctly matched?

Force – newton Energy – joule Power – watt Pressure – newton

Question 9+4

A light year is a unit of:

Time Distance Speed Light intensity

Question 10+4

A screw gauge has pitch $1\ \text{mm}$ and 100 circular-scale divisions. Its least count, in mm, is ___