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?

<p>A reference standard used for measurement (C)</p> Signup and view all the answers

Which type of units are defined for fundamental quantities?

<p>Fundamental units (B)</p> Signup and view all the answers

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

<p>To determine measurements (D)</p> Signup and view all the answers

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

<p>Meter (B)</p> Signup and view all the answers

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

<p>SI system (D)</p> Signup and view all the answers

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

<p>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)</p> Signup and view all the answers

What is the dimensional formula used for?

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

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

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

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

<p>The angle subtended at the center of a circle by an arc equal to the radius of the circle (C)</p> Signup and view all the answers

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