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.

Topic |

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 ()

B) Joule ( )

C) Newton ( )

D) Watt ( )**Correct Answer:**A) Pascal ( )**Explanation:**The SI unit of pressure is the Pascal. - Express 0.00025 in scientific notation.

A)

B)

C)

D)**Correct Answer:**A)**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)

B)

C)

D)**Correct Answer:**A)**Explanation:**Kilo represents in the metric system. - What is the SI unit of energy?

A) Joule ( )

B) Watt ( )

C) Newton ( )

D) Pascal ( )**Correct Answer:**A) Joule ( )**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) Ohm ( )

D) Farad ( )**Correct Answer:**B) Coulomb ( )**Explanation:**The Coulomb is the SI unit of electric charge. - What is the prefix for
?

A) Giga

B) Mega

C) Nano

D) Pico**Correct Answer:**C) Nano**Explanation:**Nano represents 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 ( )

B) Newton ( )

C) Pascal ( )

D) Watt ( )**Correct Answer:**A) Hertz ( )**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)

B)

C)

D)**Correct Answer:**A)**Explanation:**Milli represents in the metric system. - What is the SI unit of power?

A) Joule ( )

B) Watt ( )

C) Newton ( )

D) Pascal ( )**Correct Answer:**B) Watt ( )**Explanation:**The Watt is the SI unit of power. - Express 0.000012 in scientific notation.

A)

B)

C)

D)**Correct Answer:**B)**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)

B)

C)

D)**Correct Answer:**B)**Explanation:**Micro represents 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 ( )

B) Weber ( )

C) Ohm-meter ()

D) Joule ( )**Correct Answer:**A) Tesla ( )**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 ( )

B) Kilogram ()

C) Newton ( )

D) Joule ( )**Correct Answer:**A) Meter per second ( )**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 ( )

B) Newton ( )

C) Pascal ( )

D) Watt ( )**Correct Answer:**A) Hertz ( )**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)

B)

C)

D)**Correct Answer:**B)**Explanation:**Mega represents in the metric system. - Express 0.0000038 in scientific notation.

A)

B)

C)

D)**Correct Answer:**A)**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 ( )

B) Weber ( )

C) Ohm ( )

D) Joule ( )**Correct Answer:**B) Weber ( )**Explanation:**The Weber is the SI unit of magnetic flux. - What is the prefix for
?

A) Tera

B) Giga

C) Pico

D) Nano**Correct Answer:**C) Pico**Explanation:**Pico represents 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)

B)

C)

D)**Correct Answer:**C)**Explanation:**Milli represents in the metric system. - State the SI unit of electric current.

A) Ampere ( )

B) Volt ( )

C) Ohm ( )

D) Watt ( )**Correct Answer:**A) Ampere ( )**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
. Express this in scientific notation.

A)

B)

C)

D)**Correct Answer:**A)**Explanation:**The speed of sound in air in scientific notation is . - What is the prefix for
?

A) Mega

B) Giga

C) Tera

D) Micro**Correct Answer:**A) Mega**Explanation:**Mega represents 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 ( )

B) Ampere ( )

C) Ohm ( )

D) Coulomb ( )**Correct Answer:**A) Volt ( )**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 ( )

B) Meter per second ( )

C) Newton ( )

D) Joule ( )**Correct Answer:**A) Meter per second squared ( )**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 ( )

B) Watt ( )

C) Joule ( )

D) Pascal ( )**Correct Answer:**C) Joule ( )**Explanation:**The Joule is the SI unit of work done. - Express 0.000024 in scientific notation.

A)

B)

C)

D)**Correct Answer:**A)**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 ()

B) Tesla ( )

C) Ampere per meter ( )

D) Weber per meter squared () **Correct Answer:**C) Ampere per meter ( )**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 ( )

B) Square meter ()

C) Liter ()

D) Gram () **Correct Answer:**A) Cubic meter ( )**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)

B)

C)

D)**Correct Answer:**B)**Explanation:**Centi represents in the metric system. - State the SI unit of electric power.

A) Joule per second ()

B) Ampere per second ()

C) Watt ( )

D) Coulomb ( )**Correct Answer:**C) Watt ( )**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)

B)

C)

D)**Correct Answer:**A)**Explanation:**Kilo represents in the metric system. - Express 0.00000092 in scientific notation.

A)

B)

C)

D)**Correct Answer:**B)**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) Ohm ( )

D) Farad ( )**Correct Answer:**B) Coulomb ( )**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
?

A) Giga

B) Tera

C) Pico

D) Nano**Correct Answer:**A) Giga**Explanation:**Giga represents 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 ( )

B) Newton ( )

C) Pascal ( )

D) Watt ( )**Correct Answer:**A) Hertz ( )**Explanation:**The Hertz is the SI unit of frequency. - Convert 15 kilometers per hour to meters per second.

A)

B)

C)

D)**Correct Answer:**A)**Explanation:**To convert from kilometers per hour to meters per second, multiply by. - 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 ( )

B) Lux ()

C) Watt ( )

D) Hertz ( )**Correct Answer:**A) Candela ( )**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 ( )

B) Weber ( )

C) Ohm ( )

D) Joule ( )**Correct Answer:**B) Weber ( )**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
?

A) Giga

B) Tera

C) Mega

D) Micro**Correct Answer:**C) Mega**Explanation:**Mega represents in the metric system. - Express 0.0000043 in scientific notation.

A)

B)

C)

D)**Correct Answer:**A)**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 ( )

B) Volt ( )

C) Ohm ( )

D) Watt ( )**Correct Answer:**A) Ampere ( )**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
?

A) Kilo

B) Mega

C) Micro

D) Milli**Correct Answer:**D) Milli**Explanation:**Milli represents 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 ( )

B) Joule ( )

C) Newton ( )

D) Watt ( )**Correct Answer:**C) Newton ( )**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.

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