One mole of a substance contains _______ atoms or molecules.

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One mole of a substance contains 6.023 x 10⁺²³ atoms or molecules.

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Base Quantities and Units

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Chapter 1: Measurement - Exercises [Page 9]

Chapter 1 Measurement
Exercises | Q II. 4. | Page 9

Electric current is a ______ quantity

Luminous intensity is the intensity of ______

The coldness or hotness of a substance is expressed by _______.

The intersection of two straight lines gives us _______.

Amount of substance gives the number of particles present in a substance.

Angle formed at the top of a cone is an example for ‘plane angle’

Consider the statement given below and choose the correct option

Assertion: Electric current, amount of substance, luminous intensity are the fundamental physical quantities.

Reason: They are independent of each other.

Consider the statement given below and choose the correct option.

Assertion: Radian is the unit of solid angle.

Reason: One radian is the angle subtended at the center of a circle by an arc of length equal to its radius.

What is the symbol for a unit of electric current?

Mention the SI unit of luminous flux.