Unit and Measurement MCQs

## The product of energy and time is called action. The dimensional formula for action is same as that for

Q. The product of energy and time is called action. The dimensional formula for action is same as that for PowerAngular energyForce × velocityImpulse × distance Answer: Impulse × distance

## Which is the most accurate atomic clock?

Q. Which is the most accurate atomic clock? Carbon-12 clockCarbon atom clockCaesium atom clockStop clock Answer: Caesium atom clock

## Which pair of following quantities has dimensions different from each other

Q. Which pair of following quantities has dimensions different from each other Impulse and linear momentumPlank's constant and angular momentumMoment of inertia and moment of forceYoung's modulus and pressure Answer: Moment of inertia and moment of force

## After decimal point, number is less than 5 which is to be neglected,then retained number

Q. After decimal point, number is less than 5 which is to be neglected,then retained number gets increasedget decreasedremains unchangedmay decreased Answer: remains unchanged

## Planck’s constant has the dimensions of

Q. Planck's constant has the dimensions of : forceenergylinear momentumangular momentum Answer: angular momentum

## Which of the following is not the unit of time

Q. Which of the following is not the unit of time solar dayparallactic secondleap yearlunar month Answer: parallactic second

## A dimensionless quantity

Q. A dimensionless quantity has no unitmust have a unitcannot existMay have a unit Answer: May have a unit

## Find the option with 3 significant figures

Q. Find the option with 3 significant figures. 0.02682.0682.60826.08 Answer: 0.0268

## Which of the following is not the unit of energy?

Q. Which of the following is not the unit of energy? watt-hourelectron-voltN × mkg × m/sec Answer: kg × m/sec

## In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (= 0.5°), then the least count of the instrument is

Q. In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (= 0.5°), then the least count of the instrument is One ...

## What is the number of significant figures in 0.310×10 ?

Q. What is the number of significant figures in 0.310×10 ? 6243 Answer: 3