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Class 11 Units and Measurements for JEE

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Questions and Answers

What is the definition of a physical quantity?

A quantity that can describe the laws of physics and can be measured (correct)
A quantity that can only be measured using fundamental units
A quantity that has a standard unit of measurement
A quantity that can be classified as fundamental or derived

Which type of quantities are independent of each other?

Measurement quantities
Fundamental quantities (correct)
Physical quantities
Derived quantities

How are derived quantities defined?

Quantities that are not related to fundamental units
Quantities expressed in terms of fundamental quantities (correct)
Quantities that have no units
Quantities that are measured directly

What is a unit in the context of measuring physical quantities?

A reference standard used for measurement (C) Signup and view all the answers

Which type of units are defined for fundamental quantities?

Fundamental units (B) Signup and view all the answers

What is the purpose of comparing a physical quantity with a standard quantity?

To determine measurements (D) Signup and view all the answers

What is the fundamental unit of length in the SI system?

Meter (B) Signup and view all the answers

Which system of units is based on seven basic units and two supplementary units?

SI system (D) Signup and view all the answers

What is the definition of one candela in the SI system?

1/60th of the luminous intensity of 1 square centimeter of a perfect black body maintained at the freezing temperature of platinum (1773°C) (C) Signup and view all the answers

What is the dimensional formula used for?

To determine the units of a derived physical quantity (C) Signup and view all the answers

How is the unit of time defined in the SI system?

The time taken by the light of a specified wavelength emitted by a caesium-133 atom to execute 9192631770 vibrations (C) Signup and view all the answers