SI Units — Set 2
Physics · SI इकाइयां · Questions 11–20 of 60
The SI unit of electric potential difference is the _____.?
Correct Answer: C. Volt
The volt is the SI unit for electric potential and electromotive force. It is named after the Italian physicist Alessandro Volta. One volt is defined as the potential difference across a conductor carrying one ampere with one watt of power.
Which unit is used to measure electrical resistance?
Correct Answer: B. Ohm
The ohm is the SI unit of electrical resistance. It is named after the German physicist Georg Simon Ohm. Resistance is the property of a material to oppose the flow of current.
The SI unit of capacitance is the _____.?
Correct Answer: A. Farad
The farad is the SI unit for measuring electrical capacitance. It is named after the English scientist Michael Faraday. A capacitor has a capacitance of one farad when one coulomb of charge causes a potential difference of one volt.
The SI unit of inductance is the _____.?
Correct Answer: B. Henry
The henry is the SI unit of electrical inductance. It is named after the American scientist Joseph Henry. Inductance is the property of a conductor by which a change in current induces an electromotive force.
Which unit is used to measure luminous flux in the SI system?
Correct Answer: C. Lumen
The lumen is the SI unit for luminous flux, which measures the total quantity of visible light. It is derived from the candela and the steradian. Higher lumens indicate a brighter light source.
The SI unit of illuminance is the _____.?
Correct Answer: C. Lux
The lux is the SI unit of illuminance, measuring the luminous flux per unit area. One lux is equal to one lumen per square meter. It is used to determine the brightness of light falling on a surface.
What is the SI unit of radioactivity?
Correct Answer: B. Becquerel
The becquerel is the SI unit of radioactivity. One becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. It is named after Henri Becquerel.
The SI unit of absorbed dose of radiation is the _____.?
Correct Answer: D. Gray
The gray is the SI unit for the absorbed dose of ionizing radiation. One gray is the absorption of one joule of radiation energy per kilogram of matter. It replaced the older unit called the rad.
Which unit is used for the equivalent dose of radiation in the SI system?
Correct Answer: B. Sievert
The sievert is the SI unit used to measure the health effect of low levels of ionizing radiation. It accounts for the biological effectiveness of different types of radiation. This unit is vital for radiation protection standards.
The SI unit of catalytic activity is the _____.?
Correct Answer: A. Katal
The katal is the SI unit for measuring the catalytic activity of enzymes and other catalysts. One katal is the amount of catalyst that increases the rate of a chemical reaction by one mole per second. It was officially adopted in 1999.