Question 1

Which of the following is the SI unit of luminous intensity?

Accepted Answer

Candela. The candela is the SI unit used to measure the intensity of light. It represents the power emitted by a light source in a particular direction. It is one of the seven base SI units.

Question 2

The SI unit of plane angle is _____.?

Accepted Answer

Radian. The radian is defined as the SI unit for measuring plane angles. It is a dimensionless unit used extensively in mathematical calculations. One full circle is equivalent to 2π radians.

Question 3

What is the SI unit of pressure?

Accepted Answer

Pascal. The pascal is the standard unit of pressure in the SI system. One pascal is equal to one newton per square meter. It is named after the French scientist Blaise Pascal.

Question 4

Which unit is used to measure the amount of substance in the SI system?

Accepted Answer

Mole. The mole is the SI base unit for the amount of substance. It contains exactly 6.02214076 × 10²³ elementary entities. This constant is known as the Avogadro number.

Question 5

The unit of electric current in the SI system is the _____.?

Accepted Answer

Ampere. The ampere is the base unit of electric current in the International System of Units. It is named after the physicist André-Marie Ampère. One ampere represents the flow of one coulomb per second.

SI Units — Set 1