SI Units — Set 1
Physics · SI इकाइयां · Questions 1–10 of 60
Which of the following is the SI unit of luminous intensity?
Correct Answer: C. 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.
The SI unit of plane angle is _____.?
Correct Answer: A. 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.
What is the SI unit of pressure?
Correct Answer: C. 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.
Which unit is used to measure the amount of substance in the SI system?
Correct Answer: C. 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.
The unit of electric current in the SI system is the _____.?
Correct Answer: A. 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.
Which of the following is the SI unit of work and energy?
Correct Answer: D. Joule
The joule is the SI unit for both work and energy. It is defined as the energy transferred when a force of one newton acts over one meter. One joule is also equal to one watt-second.
The SI unit of frequency is _____.?
Correct Answer: A. Hertz
Hertz is the SI unit used to measure the frequency of periodic phenomena. One hertz is defined as one cycle per second. It is named after the German physicist Heinrich Hertz.
What is the SI unit of thermodynamic temperature?
Correct Answer: D. Kelvin
Kelvin is the primary unit of temperature in the International System of Units. Unlike Celsius, the Kelvin scale starts at absolute zero. Water freezes at 273.15 Kelvin.
The SI unit of force is named after which scientist?
Correct Answer: C. Isaac Newton
The newton is the SI unit of force named in honor of Isaac Newton. It is defined as the force needed to accelerate one kilogram at one meter per second squared. One newton is approximately the weight of a small apple.
Which unit is used to measure magnetic flux density in the SI system?
Correct Answer: B. Tesla
The tesla is the SI unit for magnetic flux density or magnetic induction. It is named after the inventor and engineer Nikola Tesla. One tesla is equal to one weber per square meter.