726. What is the commercial unit of electric current?Kilowatt - hour
727. Which gas is used in ice plants?
Ammonia
728. Which planet has equal duration of day & night as in Earth?
Mars
729. Which satellite of solar system is known as 'black moon'?
Phobos (Mars)
730. What is known as 'black lead'?
Graphite
731. Which was the first element to be made artificially?
Technetium
732. Litharge is the ore of
Lead
733. Which is the largest asteroid?
Ceres
734. Which is the best suitable dress material to wear while cooking?
Cotton
735. Which instrument is used to measure humidity?
Hygrometer
736. Who invented electric bulb?
Thomas Alva Edison
737. What is the SI unit of electric charge?
Coulomb
738. The electric current is expressed by the unit
Ampere
739. Which instrument measures electric current in a circuit?
Ammeter
740. What is the SI unit of electric potential difference?
Volt
741. The potential difference is measured by means of an instrument called
Voltmeter
742. What is the SI unit of resistance?
Ohm
743. In an electric circuit, a device called is often used to change the resistance in the circuit?
Rheostat
744. Which metal is used almost exclusively for filaments of electric bulbs?
Tungsten
745. Which chemically inactive gases are usually filled in bulbs to prolong the life of filament?
Nitrogen & Argon
746. What is the SI unit of electric power?
Watt
747. What is the name of the device that reverses the direction of flow of current through a circuit?
Commutator
748. Which instrument can detect the presence of a current in a circuit?
Galvanometer
749. In India, what is the frequency of Alternating Current (AC)?
50 Hz
750. What is the potential difference of AC supplied in India?
220 V
751. A generator converts ---------- energy into electrical energy?
Mechanical energy
752. What is the working principle of a generator?
Electromagnetic induction
753. In hydroelectric power plants, which energy of water is converted into electrical energy?
Kinetic energy
754. The greater the percentage of-------------- in a fuel, the greater is its calorific value.
Hydrogen
755. The process of burning of material in the absence of oxygen is known as -----------
Destructive distillation
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