Units and Measurements - Class 11 MCQ Test Units and Measurements - Class 11 MCQ Test 1. What is the SI unit of length? A) Meter B) Centimeter C) Kilometer D) Millimeter Correct answer: A) Meter The meter is the base unit of length in the International System of Units (SI). 2. The SI unit of mass is: A) Kilogram B) Gram C) Ton D) Pound Correct answer: A) Kilogram The kilogram is the base unit of mass in the International System of Units (SI). 3. What is the SI unit of time? A) Second B) Minute C) Hour D) Day Correct answer: A) Second The second is the base unit of time in the International System of Units (SI). 4. What is the SI unit of electric current? A) Ampere B) Volt C) Watt D) Ohm Correct answer: A) Ampere The ampere is the base unit of electric current in the International System of Units (SI). 5. The unit of temperature in the SI system is: A) Kelvin B) Celsius C) Fahrenheit D) Rankine Correct answer: A) Kelvin The kelvin is the base unit of thermodynamic temperature in the International System of Units (SI). 6. The SI unit of amount of substance is: A) Mole B) Litre C) Gram D) Milliliter Correct answer: A) Mole The mole is the base unit of amount of substance in the International System of Units (SI). 7. The SI unit of luminous intensity is: A) Candela B) Lux C) Lumen D) Watt Correct answer: A) Candela The candela is the base unit of luminous intensity in the International System of Units (SI). 8. Which of the following is the correct relationship for a prefix of the SI system? A) 1 kilometer = 1000 meters B) 1 millimeter = 10 meters C) 1 megabyte = 100 bytes D) 1 gram = 1000 kilograms Correct answer: A) 1 kilometer = 1000 meters The prefix "kilo-" in the SI system means 1000, so 1 kilometer equals 1000 meters. 9. Which of the following is a derived unit? A) Newton B) Meter C) Second D) Ampere Correct answer: A) Newton The newton is a derived unit of force, defined as kg·m/s². Meter, second, and ampere are all base units. 10. The metric system of measurement is based on which of the following? A) Power of 10 B) Decimal system C) Binary system D) Logarithmic system Correct answer: B) Decimal system The metric system is based on the decimal system, which uses powers of 10 for unit conversions. 11. The SI unit of force is: A) Newton B) Joule C) Pascal D) Watt Correct answer: A) Newton The newton (N) is the SI derived unit of force, named after Sir Isaac Newton. 12. The basic quantity measured in thermodynamics is: A) Temperature B) Length C) Mass D) Time Correct answer: A) Temperature Temperature is a fundamental quantity in thermodynamics, while length, mass, and time are more general base quantities. 13. Which of the following is not an SI base unit? A) Kelvin B) Mole C) Newton D) Ampere Correct answer: C) Newton The newton is a derived unit (kg·m/s²), while kelvin, mole, and ampere are all SI base units. 14. The unit of power in the SI system is: A) Watt B) Joule C) Newton D) Ampere Correct answer: A) Watt The watt (W) is the SI derived unit of power, equal to one joule per second. 15. The number of significant figures in 0.0023 is: A) 2 B) 3 C) 4 D) 5 Correct answer: A) 2 Leading zeros are not significant, so only the digits 2 and 3 are significant in 0.0023. 16. What is the dimension of force? A) M L T^-2 B) M L^2 T^-2 C) M L^2 T^-1 D) M^2 L T^-2 Correct answer: A) M L T^-2 Force = mass × acceleration, and acceleration has dimensions L T^-2, so force has dimensions M L T^-2. 17. The metric unit for density is: A) Kilogram per meter cubed B) Gram per meter cubed C) Gram per centimeter cubed D) Pound per inch cubed Correct answer: A) Kilogram per meter cubed The SI unit for density is kg/m³ (kilogram per cubic meter), though g/cm³ is also commonly used. 18. The SI unit for velocity is: A) Meter per second B) Meter per minute C) Kilometer per hour D) Meter per hour Correct answer: A) Meter per second Velocity is distance over time, so its SI unit is meters per second (m/s). 19. What is the standard unit of pressure in the SI system? A) Pascal B) Newton per meter squared C) Atmosphere D) Bar Correct answer: A) Pascal The pascal (Pa) is the SI unit of pressure, equal to one newton per square meter. 20. Which of the following quantities is scalar? A) Speed B) Velocity C) Force D) Acceleration Correct answer: A) Speed Speed is a scalar quantity (magnitude only), while velocity, force, and acceleration are all vector quantities (magnitude and direction). Submit
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