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Assertion: When a battery is short circuited, the terminal voltage is zero.
Reason: In short circuit, the current is zero.CorrectIncorrect
Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.
Reason: Generally, the metal disc of a cell acts as a positive terminal.CorrectIncorrect
Electrical resistivity of any given metallic wire depends uponCorrectIncorrect
Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points isCorrectIncorrect
100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:CorrectIncorrect
The resistivity of insulators is of the order ofCorrectIncorrect
An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?CorrectIncorrect
The electrical resistance of insulators isCorrectIncorrect
When electric current is passed, electrons move from:CorrectIncorrect
The heating element of an electric iron is made up of:CorrectIncorrect
Coulomb is the SI unit of:CorrectIncorrect
Work done to move 1coulomb charge from one point to another point on a charged conductor having potential 10volt isCorrectIncorrect
The effective resistance between A and B isCorrectIncorrect
A student says that the resistance of two wires of same length and same area of cross section is same. This statement is correct ifCorrectIncorrect
A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used isCorrectIncorrect
If the current I through a resistor is increased by 100% the increased in power dissipation will be (assume temperature remain unchanged)CorrectIncorrect
A coil in the heater consume power P on passing current. If it is cut into halves and joined in parallel, it will consume powerCorrectIncorrect
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, thenCorrectIncorrect
A metallic conductor has loosely bound electrons called free electrons. The metallic conductor isCorrectIncorrect
To get 2 Ω resistance using only 6 Ω resistors, the number of them required isCorrectIncorrect
Resistivity of a metallic wise depends onCorrectIncorrect
Assertion: Conductors allow the current to flow through themselves.
Reason: They have free charge carriers.CorrectIncorrect
Assertion: Bending of wire decrease the resistance of electric wire.
Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.CorrectIncorrect
What is the commercial unit of electrical energy?CorrectIncorrect
A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it isCorrectIncorrect
A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire ofCorrectIncorrect
Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should beCorrectIncorrect
Which of the following gases are filled in electric bulbs?CorrectIncorrect
Electric power is inversely proportional toCorrectIncorrect
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be:CorrectIncorrect