Physical Quantities MCQs with Explanations for Class 9 [1000+]

Access 1000+ topic-wise physical quantities MCQs with detailed explanations, perfect for Class 9 students seeking to enhance their understanding of physical quantities and their measurements.

Physics Class 9 Physical Quantities Topic-wise MCQs

Access comprehensive collections of Class 9 Physics MCQs, tailored to specific topics for focused exploration and in-depth study. Each topic encompasses over 100+ MCQs, providing ample opportunities for practice to reinforce understanding and master Physics concepts effectively. Explore MCQs for each topic by simply selecting the respective category below.

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Based Quantities & Derived Quantities MCQs

International System of Units MCQs

Prefixes MCQs

Scientific Notation MCQs

Measuring Instruments MCQs

Significant Figures MCQs

Physical Quantities MCQs with Explanations for Class 9 [100+]

Our comprehensive repository of multiple-choice questions (MCQs) dedicated to Physical Quantities. Designed specifically for Class 9 students, this extensive collection of over 1000 topic-wise MCQs, coupled with detailed explanations, offers a valuable resource for mastering fundamental concepts in physics.

The density of an object is calculated by dividing its mass by its _.
A) Volume
B) Length
C) Temperature
D) Time
Correct Answer: A) Volume
Explanation: Density is defined as mass per unit volume.
The SI unit of pressure is the _.
A) Pascal ( $Pa$ )
B) Joule ( $J$ )
C) Newton ( $N$ )
D) Watt ( $W$ )
Correct Answer: A) Pascal ( $Pa$ )
Explanation: The SI unit of pressure is the Pascal.
Express 0.00025 in scientific notation.
A) $2.5 \times 10^{-4}$
B) $25 \times 10^{-5}$
C) $2.5 \times 10^{-3}$
D) $25 \times 10^{-4}$
Correct Answer: A) $2.5 \times 10^{-4}$
Explanation: To express a number in scientific notation, move the decimal point to form a number between 1 and 10 and multiply by the appropriate power of 10.
Which instrument is used to measure atmospheric pressure?
A) Hygrometer
B) Barometer
C) Anemometer
D) Thermometer
Correct Answer: B) Barometer
Explanation: A barometer is specifically designed to measure atmospheric pressure.
The prefix kilo represents _.
A) $10^3$
B) $10^6$
C) $10^9$
D) $10^{-3}$
Correct Answer: A) $10^3$
Explanation: Kilo represents $10^3$ in the metric system.
What is the SI unit of energy?
A) Joule ( $J$ )
B) Watt ( $W$ )
C) Newton ( $N$ )
D) Pascal ( $Pa$ )
Correct Answer: A) Joule ( $J$ )
Explanation: The Joule is the SI unit of energy.
Convert 4500 millimeters to meters.
A) 0.45 meters
B) 4.5 meters
C) 45 meters
D) 450 meters
Correct Answer: B) 4.5 meters
Explanation: To convert from millimeters to meters, divide by 1000.
Which of the following is a scalar quantity?
A) Velocity
B) Acceleration
C) Force
D) Speed
Correct Answer: D) Speed
Explanation: Speed is a scalar quantity as it only has magnitude and no direction.
State the SI unit of electric charge.
A) Ampere-hour (A.hr)
B) Coulomb ( $C$ )
C) Ohm ( $\Omega$ )
D) Farad ( $F$ )
Correct Answer: B) Coulomb ( $C$ )
Explanation: The Coulomb is the SI unit of electric charge.
What is the prefix for $10^{-9}$ ?
A) Giga
B) Mega
C) Nano
D) Pico
Correct Answer: C) Nano
Explanation: Nano represents $10^{-9}$ in the metric system.
Determine the number of significant figures in the measurement 0.00350 m.
A) 2
B) 3
C) 4
D) 5
Correct Answer: C) 4
Explanation: All non-zero digits, as well as zeros between non-zero digits and to the right of a decimal point, are considered significant.
The SI unit of frequency is the _.
A) Hertz ( $Hz$ )
B) Newton ( $N$ )
C) Pascal ( $Pa$ )
D) Watt ( $W$ )
Correct Answer: A) Hertz ( $Hz$ )
Explanation: The Hertz is the SI unit of frequency.
Convert 7200 seconds to hours.
A) 0.2 hours
B) 2 hours
C) 20 hours
D) 200 hours
Correct Answer: B) 2 hours
Explanation: To convert from seconds to hours, divide by 3600.
Which of the following is a derived quantity?
A) Mass
B) Length
C) Time
D) Speed
Correct Answer: D) Speed
Explanation: Speed is a derived quantity as it is defined as the rate of change of distance with respect to time.
The prefix milli represents _.
A) $10^{-3}$
B) $10^{-6}$
C) $10^{-9}$
D) $10^{3}$
Correct Answer: A) $10^{-3}$
Explanation: Milli represents $10^{-3}$ in the metric system.
What is the SI unit of power?
A) Joule ( $J$ )
B) Watt ( $W$ )
C) Newton ( $N$ )
D) Pascal ( $Pa$ )
Correct Answer: B) Watt ( $W$ )
Explanation: The Watt is the SI unit of power.
Express 0.000012 in scientific notation.
A) $1.2 \times 10^{-5}$
B) $12 \times 10^{-6}$
C) $1.2 \times 10^{-4}$
D) $12 \times 10^{-5}$
Correct Answer: B) $12 \times 10^{-6}$
Explanation: To express a number in scientific notation, move the decimal point to form a number between 1 and 10 and multiply by the appropriate power of 10.
Which instrument is used to measure electric potential difference?
A) Ammeter
B) Voltmeter
C) Thermometer
D) Barometer
Correct Answer: B) Voltmeter
Explanation: A voltmeter is specifically designed to measure electric potential difference.
The prefix micro represents _.
A) $10^{-3}$
B) $10^{-6}$
C) $10^{-9}$
D) $10^{3}$
Correct Answer: B) $10^{-6}$
Explanation: Micro represents $10^{-6}$ in the metric system.
Convert 6 hours to seconds.
A) 21600 seconds
B) 18000 seconds
C) 7200 seconds
D) 3600 seconds
Correct Answer: A) 21600 seconds
Explanation: To convert from hours to seconds, multiply by 3600.
State the SI unit of magnetic flux density.
A) Tesla ( $T$ )
B) Weber ( $Wb$ )
C) Ohm-meter ( $\Omega \cdot m$ )
D) Joule ( $J$ )
Correct Answer: A) Tesla ( $T$ )
Explanation: The Tesla is the SI unit of magnetic flux density.

What is the significance of significant figures in a measurement?
A) They indicate the precision of the measurement.
B) They represent the accuracy of the measurement.
C) They determine the magnitude of the measurement.
D) They have no significance in measurements.
Correct Answer: A) They indicate the precision of the measurement.
Explanation: Significant figures are the digits in a measurement that are known with certainty plus one uncertain digit.
The SI unit of velocity is _.
A) Meter per second ( $m/s$ )
B) Kilogram ( $kg$ )
C) Newton ( $N$ )
D) Joule ( $J$ )
Correct Answer: A) Meter per second ( $m/s$ )
Explanation: Velocity is measured in meters per second.
Convert 3.6 kilometers to meters.
A) 0.036 meters
B) 36 meters
C) 360 meters
D) 3600 meters
Correct Answer: D) 3600 meters
Explanation: To convert from kilometers to meters, multiply by 1000.
Which of the following is a base quantity?
A) Mass
B) Speed
C) Volume
D) Density
Correct Answer: A) Mass
Explanation: Mass is a base quantity as it is not defined in terms of other quantities.
State the SI unit of frequency.
A) Hertz ( $Hz$ )
B) Newton ( $N$ )
C) Pascal ( $Pa$ )
D) Watt ( $W$ )
Correct Answer: A) Hertz ( $Hz$ )
Explanation: The Hertz is the SI unit of frequency.
Convert 5000 grams to kilograms.
A) 0.05 kilograms
B) 0.5 kilograms
C) 5 kilograms
D) 50 kilograms
Correct Answer: C) 5 kilograms
Explanation: To convert from grams to kilograms, divide by 1000.
The prefix mega represents _.
A) $10^3$
B) $10^6$
C) $10^9$
D) $10^{-3}$
Correct Answer: B) $10^6$
Explanation: Mega represents $10^6$ in the metric system.
Express 0.0000038 in scientific notation.
A) $3.8 \times 10^{-6}$
B) $38 \times 10^{-7}$
C) $3.8 \times 10^{-5}$
D) $38 \times 10^{-6}$
Correct Answer: A) $3.8 \times 10^{-6}$
Explanation: To express a number in scientific notation, move the decimal point to form a number between 1 and 10 and multiply by the appropriate power of 10.
Which instrument is used to measure electric resistance?
A) Ammeter
B) Voltmeter
C) Thermometer
D) Ohmmeter
Correct Answer: D) Ohmmeter
Explanation: An ohmmeter is specifically designed to measure electric resistance.
State the SI unit of magnetic flux.
A) Tesla ( $T$ )
B) Weber ( $Wb$ )
C) Ohm ( $\Omega$ )
D) Joule ( $J$ )
Correct Answer: B) Weber ( $Wb$ )
Explanation: The Weber is the SI unit of magnetic flux.
What is the prefix for $10^{-12}$ ?
A) Tera
B) Giga
C) Pico
D) Nano
Correct Answer: C) Pico
Explanation: Pico represents $10^{-12}$ in the metric system.
Convert 5 minutes to seconds.
A) 300 seconds
B) 500 seconds
C) 600 seconds
D) 360 seconds
Correct Answer: A) 300 seconds
Explanation: To convert from minutes to seconds, multiply by 60.
Which of the following is a derived quantity?
A) Mass
B) Time
C) Length
D) Density
Correct Answer: D) Density
Explanation: Density is a derived quantity as it is defined as mass per unit volume.
The prefix milli represents _.
A) $10^3$
B) $10^6$
C) $10^{-3}$
D) $10^{-6}$
Correct Answer: C) $10^{-3}$
Explanation: Milli represents $10^{-3}$ in the metric system.
State the SI unit of electric current.
A) Ampere ( $A$ )
B) Volt ( $V$ )
C) Ohm ( $\Omega$ )
D) Watt ( $W$ )
Correct Answer: A) Ampere ( $A$ )
Explanation: The Ampere is the SI unit of electric current.
Convert 2.5 kilometers to meters.
A) 0.025 meters
B) 25 meters
C) 250 meters
D) 2500 meters
Correct Answer: D) 2500 meters
Explanation: To convert from kilometers to meters, multiply by 1000.
Which of the following is a vector quantity?
A) Time
B) Mass
C) Speed
D) Displacement
Correct Answer: D) Displacement
Explanation: Displacement is a vector quantity as it has both magnitude and direction.
The speed of sound in air is approximately $340 \, m/s$ . Express this in scientific notation.
A) $3.4 \times 10^2 \, m/s$
B) $34 \times 10^1 \, m/s$
C) $34 \times 10^2 \, m/s$
D) $340 \times 10^0 \, m/s$
Correct Answer: A) $3.4 \times 10^2 \, m/s$
Explanation: The speed of sound in air in scientific notation is $3.4 \times 10^2 \, m/s$ .
What is the prefix for $10^6$ ?
A) Mega
B) Giga
C) Tera
D) Micro
Correct Answer: A) Mega
Explanation: Mega represents $10^6$ in the metric system.
Determine the number of significant figures in the measurement 0.00870 kg.
A) 2
B) 3
C) 4
D) 5
Correct Answer: D) 5
Explanation: All non-zero digits, as well as zeros between non-zero digits and to the right of a decimal point, are considered significant.
The SI unit of electric potential difference is the _.
A) Volt ( $V$ )
B) Ampere ( $A$ )
C) Ohm ( $\Omega$ )
D) Coulomb ( $C$ )
Correct Answer: A) Volt ( $V$ )
Explanation: The Volt is the SI unit of electric potential difference.
Convert 20 centimeters to meters.
A) 0.002 meters
B) 0.02 meters
C) 0.2 meters
D) 2 meters
Correct Answer: B) 0.02 meters
Explanation: To convert from centimeters to meters, divide by 100.
Which of the following is a scalar quantity?
A) Force
B) Displacement
C) Velocity
D) Acceleration
Correct Answer: A) Force
Explanation: Force is a scalar quantity as it only has magnitude and no direction.
State the SI unit of acceleration.
A) Meter per second squared ( $m/s^2$ )
B) Meter per second ( $m/s$ )
C) Newton ( $N$ )
D) Joule ( $J$ )
Correct Answer: A) Meter per second squared ( $m/s^2$ )
Explanation: Acceleration is measured in meters per second squared.
Convert 5 meters per second to kilometers per hour.
A) 18 kilometers per hour
B) 50 kilometers per hour
C) 1800 kilometers per hour
D) 5000 kilometers per hour
Correct Answer: A) 18 kilometers per hour
Explanation: To convert from meters per second to kilometers per hour, multiply by 3.6.
What is the SI unit of work done?
A) Newton ( $N$ )
B) Watt ( $W$ )
C) Joule ( $J$ )
D) Pascal ( $Pa$ )
Correct Answer: C) Joule ( $J$ )
Explanation: The Joule is the SI unit of work done.
Express 0.000024 in scientific notation.
A) $2.4 \times 10^{-5}$
B) $24 \times 10^{-6}$
C) $2.4 \times 10^{-4}$
D) $24 \times 10^{-5}$
Correct Answer: A) $2.4 \times 10^{-5}$
Explanation: To express a number in scientific notation, move the decimal point to form a number between 1 and 10 and multiply by the appropriate power of 10.
Which instrument is used to measure electric resistance?
A) Ammeter
B) Voltmeter
C) Thermometer
D) Ohmmeter
Correct Answer: D) Ohmmeter
Explanation: An ohmmeter is specifically designed to measure electric resistance.
State the SI unit of magnetic field strength.
A) Tesla per meter ( $T/m$ )
B) Tesla ( $T$ )
C) Ampere per meter ( $A/m$ )
D) Weber per meter squared ( $Wb/m^2$ )
Correct Answer: C) Ampere per meter ( $A/m$ )
Explanation: The Ampere per meter is the SI unit of magnetic field strength.
Convert 10 kilograms to grams.
A) 0.1 grams
B) 1 grams
C) 10 grams
D) 10000 grams
Correct Answer: D) 10000 grams
Explanation: To convert from kilograms to grams, multiply by 1000.
What is the significance of significant figures in a measurement?
A) They indicate the precision of the measurement.
B) They represent the accuracy of the measurement.
C) They determine the magnitude of the measurement.
D) They have no significance in measurements.
Correct Answer: A) They indicate the precision of the measurement.
Explanation: Significant figures are the digits in a measurement that are known with certainty plus one uncertain digit.
The SI unit of volume is the _.
A) Cubic meter ( $m^3$ )
B) Square meter ( $m^2$ )
C) Liter ( $L$ )
D) Gram ( $g$ )
Correct Answer: A) Cubic meter ( $m^3$ )
Explanation: The cubic meter is the SI unit of volume.
Convert 2000 milligrams to grams.
A) 0.002 grams
B) 2 grams
C) 20 grams
D) 200 grams
Correct Answer: B) 2 grams
Explanation: To convert from milligrams to grams, divide by 1000.
Which of the following is a derived quantity?
A) Mass
B) Time
C) Length
D) Density
Correct Answer: D) Density
Explanation: Density is a derived quantity as it is defined as mass per unit volume.
The prefix centi represents _.
A) $10^{-3}$
B) $10^{-2}$
C) $10^{-1}$
D) $10^2$
Correct Answer: B) $10^{-2}$
Explanation: Centi represents $10^{-2}$ in the metric system.
State the SI unit of electric power.
A) Joule per second ( $J/s$ )
B) Ampere per second ( $A/s$ )
C) Watt ( $W$ )
D) Coulomb ( $C$ )
Correct Answer: C) Watt ( $W$ )
Explanation: The Watt is the SI unit of electric power.
Convert 1.5 liters to milliliters.
A) 150 milliliters
B) 1500 milliliters
C) 15000 milliliters
D) 150000 milliliters
Correct Answer: B) 1500 milliliters
Explanation: To convert from liters to milliliters, multiply by 1000.
The prefix kilo represents _.
A) $10^3$
B) $10^6$
C) $10^{-3}$
D) $10^{-6}$
Correct Answer: A) $10^3$
Explanation: Kilo represents $10^3$ in the metric system.
Express 0.00000092 in scientific notation.
A) $0.92 \times 10^{-7}$
B) $9.2 \times 10^{-8}$
C) $9.2 \times 10^{-7}$
D) $92 \times 10^{-8}$
Correct Answer: B) $9.2 \times 10^{-8}$
Explanation: To express a number in scientific notation, move the decimal point to form a number between 1 and 10 and multiply by the appropriate power of 10.
Which instrument is used to measure electric current?
A) Ammeter
B) Voltmeter
C) Thermometer
D) Barometer
Correct Answer: A) Ammeter
Explanation: An ammeter is specifically designed to measure electric current.
State the SI unit of electric charge.
A) Ampere-hour (A.hr)
B) Coulomb ( $C$ )
C) Ohm ( $\Omega$ )
D) Farad ( $F$ )
Correct Answer: B) Coulomb ( $C$ )
Explanation: The Coulomb is the SI unit of electric charge.
Convert 3000 meters to kilometers.
A) 0.03 kilometers
B) 3 kilometers
C) 30 kilometers
D) 300 kilometers
Correct Answer: B) 3 kilometers
Explanation: To convert from meters to kilometers, divide by 1000.
What is the prefix for $10^9$ ?
A) Giga
B) Tera
C) Pico
D) Nano
Correct Answer: A) Giga
Explanation: Giga represents $10^9$ in the metric system.
Determine the number of significant figures in the measurement 7000.0 cm.
A) 2
B) 3
C) 4
D) 5
Correct Answer: D) 5
Explanation: All non-zero digits, as well as zeros between non-zero digits and to the right of a decimal point, are considered significant.
The SI unit of frequency is the _.
A) Hertz ( $Hz$ )
B) Newton ( $N$ )
C) Pascal ( $Pa$ )
D) Watt ( $W$ )
Correct Answer: A) Hertz ( $Hz$ )
Explanation: The Hertz is the SI unit of frequency.
Convert 15 kilometers per hour to meters per second.
A) $4.17 \, m/s$
B) $6.25 \, m/s$
C) $12.5 \, m/s$
D) $45 \, m/s$
Correct Answer: A) $4.17 \, m/s$
Explanation: To convert from kilometers per hour to meters per second, multiply by $\frac{5}{18}$ .
Which of the following is a scalar quantity?
A) Velocity
B) Acceleration
C) Force
D) Displacement
Correct Answer: C) Force
Explanation: Force is a scalar quantity as it only has magnitude and no direction.
State the SI unit of luminous intensity.
A) Candela ( $cd$ )
B) Lux ( $lx$ )
C) Watt ( $W$ )
D) Hertz ( $Hz$ )
Correct Answer: A) Candela ( $cd$ )
Explanation: The SI unit of luminous intensity is the candela.
Convert 0.025 kilograms to grams.
A) 0.25 grams
B) 2.5 grams
C) 25 grams
D) 250 grams
Correct Answer: C) 25 grams
Explanation: To convert from kilograms to grams, multiply by 1000.
What is the significance of significant figures in a measurement?
A) They indicate the precision of the measurement.
B) They represent the accuracy of the measurement.
C) They determine the magnitude of the measurement.
D) They have no significance in measurements.
Correct Answer: A) They indicate the precision of the measurement.
Explanation: Significant figures are the digits in a measurement that are known with certainty plus one uncertain digit.
The SI unit of temperature is the _.
A) Celsius
B) Kelvin
C) Fahrenheit
D) Rankine
Correct Answer: B) Kelvin
Explanation: The Kelvin (K) is the SI unit of temperature.
Convert 4.8 hours to minutes.
A) 28.8 minutes
B) 48 minutes
C) 288 minutes
D) 480 minutes
Correct Answer: D) 480 minutes
Explanation: To convert from hours to minutes, multiply by 60.
Which of the following is a derived quantity?
A) Density
B) Time
C) Mass
D) Length
Correct Answer: A) Density
Explanation: Density is a derived quantity as it is defined as mass per unit volume.
State the SI unit of magnetic flux.
A) Tesla ( $T$ )
B) Weber ( $Wb$ )
C) Ohm ( $\Omega$ )
D) Joule ( $J$ )
Correct Answer: B) Weber ( $Wb$ )
Explanation: The Weber is the SI unit of magnetic flux.
Convert 7.2 meters to millimeters.
A) 0.0072 millimeters
B) 0.072 millimeters
C) 72 millimeters
D) 7200 millimeters Correct Answer: D) 7200 millimeters
Explanation: To convert from meters to millimeters, multiply by 1000.
What is the prefix for $10^6$ ?
A) Giga
B) Tera
C) Mega
D) Micro
Correct Answer: C) Mega
Explanation: Mega represents $10^6$ in the metric system.
Express 0.0000043 in scientific notation.
A) $4.3 \times 10^{-5}$
B) $43 \times 10^{-6}$
C) $4.3 \times 10^{-4}$
D) $43 \times 10^{-5}$
Correct Answer: A) $4.3 \times 10^{-5}$
Explanation: To express a number in scientific notation, move the decimal point to form a number between 1 and 10 and multiply by the appropriate power of 10.
Which instrument is used to measure temperature?
A) Barometer
B) Anemometer
C) Thermometer
D) Hygrometer
Correct Answer: C) Thermometer
Explanation: A thermometer is specifically designed to measure temperature.
State the SI unit of electric current.
A) Ampere ( $A$ )
B) Volt ( $V$ )
C) Ohm ( $\Omega$ )
D) Watt ( $W$ )
Correct Answer: A) Ampere ( $A$ )
Explanation: The Ampere is the SI unit of electric current.
Convert 1000 milliliters to liters.
A) 0.1 liters
B) 1 liter
C) 10 liters
D) 100 liters
Correct Answer: B) 1 liter
Explanation: To convert from milliliters to liters, divide by 1000.
What is the prefix for $10^{-3}$ ?
A) Kilo
B) Mega
C) Micro
D) Milli
Correct Answer: D) Milli
Explanation: Milli represents $10^{-3}$ in the metric system.
Determine the number of significant figures in the measurement 0.00085 m.
A) 2
B) 3
C) 4
D) 5
Correct Answer: C) 4
Explanation: All non-zero digits, as well as zeros between non-zero digits and to the right of a decimal point, are considered significant.
The SI unit of force is the _.
A) Pascal ( $Pa$ )
B) Joule ( $J$ )
C) Newton ( $N$ )
D) Watt ( $W$ )
Correct Answer: C) Newton ( $N$ )
Explanation: The SI unit of force is the Newton.
Convert 3000 grams to kilograms.
A) 0.03 kilograms
B) 3 kilograms
C) 30 kilograms
D) 300 kilograms
Correct Answer: B) 3 kilograms
Explanation: To convert from grams to kilograms, divide by 1000.