# Mcqs on units and measurements

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Test your understanding on the topic of units and measurements by Mcqs on units and measurements help in understanding the basics of this topic can help you solve a variety of problems. In this post, we’ll be exploring multiple-choice questions related to units and measurements and providing the answers to help you test your knowledge. So let’s get started!

Contents

Physics. Measurements/units and measuring devices and scales

Units and measurements are the cornerstones of scientific study. They are the fundamental building blocks of our world, and understanding them is essential for making sense of the data we have. That’s why we’ve compiled this post – to help you get a better grasp on the basics of units and measurements.

We’ll be covering topics such as the International System of Units (SI units) and their sub-divisions, the differences between the US customary system and the metric system, and the concept of dimensional analysis. We’ll also be exploring the different ways in which these units and measurements are used in the world of science. we’ve included a series of MCQs based on the topics we’ll be discussing. With these, you’ll be able to test your knowledge on the key concepts and make sure you’re up-to-date on the latest information about units and measurements. So let’s get started!

Q1. The SI unit of power is

(a) Hertz

(b) Volts

(c) Watt

(d) Neutron

(c) Watt

Q2. Frequency is measured in

(a) hertz

(b) metre/second

(d) watt

(a) hertz

Q3. The SI unit of electric power is :

(a) Ampere

(b) Volt

(c) Coulomb

(d) Watt

(d) Watt

Q4. The SI unit of the force is ­

(b) Fermi

(c) Newton

(d) Rutherford

(c) Newton

Q5. The SI unit of work is

(a) Joule

(b) Neutron

(c) Watt

(d) Dyne

(a) Joule

Q6. Light-year is the SI unit of ­

(a) Energy

(b) Intensity

(c) Age

(d) Distance

(d) Distance

Q7. The SI unit of electric current is :

(a) Ampere

(b) Volt

(c) Coulomb

(d) Watt

(a) Ampere

Q8. Angstrom is a SI unit of

(a) velocity

(b) energy

(c) frequency

(d) wavelength

(d) wavelength

Q9. What is the unit of pressure?

(a) Newton / sq. metre

(b) Newton-metre

(c) Newton

(d) Newton/metre

(a) Newton / sq. metre

Q10. The smallest unit of length is ­

(a) Micron

(b) Fermimetre

(c) Angstrom

(d) Nanometre

(b) Fermimetre

Q11. Dobson’ Unit is used for the measurement of ­

(a) Thickness of Earth

(b) Thickness of Ozone layer

(c) Thickness of Diamond

(d) Measurement of Noise

(b) Thickness of Ozone layer

Q12. The velocity of wind is measured by :

(a) Barometer

(b) Anemometer

(c) Hydrometer

(d) Wind vane

(b) Anemometer

Q13. Which of the following device is used to measure electric current

(a) Voltmeter

(b) Ammeter

(c) Voltameter

(d) Potentiometer

(b) Ammeter

Q14. Which one of the instruments is used to measure atmospheric pressure?

(a) Hydrometer

(b) Barometer

(c) Manometer

(d) Hygrometer

(b) Barometer

Q15. Richter scale is used for measuring ­

(a) Amplitude of seismic waves

(b) Intensity of light

(c)  Velocity of sound

(d) Intensity of sound

(a) Amplitude of seismic waves

Q16. Fathometer is used to measure :

(a) Earthquake

(b) Depth of sea

(c) Rain

(d) Sound intensity

(b) Depth of sea

Q17. The device used for detecting lie is known as

(a) Gyroscope

(b) Pyrometer

(c) Polygraph

(d) Kymograph

(c) Polygraph

Q18. The density of milk is measured by?

(a) Hygrometer

(b) Hydrometer

(c) Barometer

(d) Lactometer

(d) Lactometer

Q19. A medical device used for listening to the  sounds of the heart

(a) Viscometer

(b) Hydrometer

(c) Stethoscope

(d) Lactometer

(c) Stethoscope

Q20. A detection system that uses radio  waves to determine the range, angle or  velocity of objects

(a) SONAR

(c) Wind vane

(d) Lactometer

Q21. It gathers and measures the amount of liquid  precipitation over a set period.

(c) Wind vane

(d) Rain Gauge

(d) Rain Gauge

Q22. It is a transducer  that converts sound waves into electrical  signals.

(b) Microphone

(c) Microtome

(d) Nephoscope

(b) Microphone

Q23. Which of the following instruments helps to detect or locate submerged submarines and icebergs.

a) Audiometer

(b) Galvanometer

(c) Sextant

(d) SONAR

(d) SONAR

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## Units and measurements class 11 notes

1. Introduction to Units and Measurement:
• Definition of physical quantities, fundamental and derived quantities.
• Need for measurement and the role of units.
• Systems of units: CGS system, FPS system, MKS system, and the International System of Units (SI).
2. Fundamental and Derived Units:
• Definition and examples of fundamental units.
• Derived units and their relation to fundamental units.
• Prefixes and their use in representing decimal multiples and submultiples of units.
3. Dimensions and Dimensional Analysis:
• Definition of dimensions and dimensional formula.
• Homogeneous and heterogeneous dimensions.
• Dimensional analysis and its applications in checking equations, deriving formulas, and solving problems.
4. Conversion of Units:
• Conversion between different systems of units (e.g., CGS to SI, FPS to SI).
• Conversion of units within the same system using conversion factors.
5. Significant Figures and Errors:
• Rules for determining significant figures in a measured value.
• Mathematical operations with significant figures.
• Absolute and relative errors, error propagation, and significant figures in calculations.
6. Measurement of Length, Mass, and Time:
• Techniques and instruments for measuring length, such as a vernier caliper and screw gauge.
• Measurement of mass using a balance.
• Measurement of time using different types of clocks and timers.
7. Errors and Uncertainties in Measurements:
• Sources of errors in measurements: systematic and random errors.
• Accuracy, precision, and uncertainty in measurements.
• Error analysis, error bars, and error propagation.

## Mcqs on units and measurements

What is the SI unit of mass?

a) Kilogram

b) Pound

c) Gram

d) Newton

What is the SI unit of time?

a) Second

b) Minute

c) Hour

d) Day

What is the SI unit of length?

a) Meter

b) Foot

c) Inch

d) Yard

What is the SI unit of temperature?

a) Kelvin

b) Celsius

c) Fahrenheit

d) Rankine

What is the SI unit of electric current?

a) Ampere

b) Volt

c) Ohm

d) Watt

What is the SI unit of luminous intensity?

a) Candela

b) Lux

c) Watt

d) Newton

What is the SI unit of electric charge?

a) Coulomb

b) Ohm

c) Watt

d) Volt

What is the SI unit of energy?

a) Joule

b) Watt

c) Newton

d) Ampere

What is the SI unit of frequency?

a) Hertz

b) Watt

c) Ampere

d) Newton

What is the SI unit of power?

a) Watt

b) Joule

c) Newton

d) Volt

### What is the difference between a unit and a measurement?

A unit is a standard quantity used for measuring a particular physical quantity, such as meters for length or kilograms for mass. A measurement, on the other hand, is the value obtained by comparing an unknown quantity to a known unit.

### Why do we need standardized units of measurement?

Standardized units provide a common language for scientists, engineers, and people in various fields to communicate and compare measurements accurately. They ensure consistency, precision, and reliability in scientific experiments, calculations, and everyday applications.

### What is the International System of Units (SI)?

The International System of Units, abbreviated as SI (from the French name “Système International d’Unités”), is the globally recognized system of measurement used in most countries. It provides a coherent set of base units and derived units for measuring various physical quantities, including length, mass, time, temperature, and more.

### Can units be converted between different systems of measurement?

Yes, units can be converted between different systems of measurement. Conversion factors are used to change units from one system to another. For example, to convert inches to centimeters, you can multiply the value in inches by the conversion factor 2.54.

### Are there any units that are no longer used?

Over time, some units have become obsolete or less commonly used due to advancements in science and technology. Examples include the cubit (ancient unit of length), furlong (used in horse racing), and league (used for measuring distances). However, many traditional units are still used in specific contexts or regions, alongside the SI units.