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Crash Test Session For Repeater
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The current passing a conductor is 5mA in 2s. The charge moving through it.
When the length and area of crosssection both are doubled, then its resistance
A wire is stretched such that its resistance becomes 16 times? What will be the new area of cross section of the wire?
Ohm's law is true
An ideal voltmeter is connected in parallel to the resistor “R”. Two ampere meters A1 and A2 are also connected as shown in the figure. What is true?
In a semiconductor, an electric current flow due to
A certain piece of silver of given mass is to be made like a wire. Which of the following combination of length (L) and the area of crosssection will lead to the smallest resistance?
A wire of uniform area of crosssection A length ‘l’ & resistance ‘R’ is cut into two parts the resistivity of each part.
Drift velocity of electrons in a metallic conductor is of the order of
A 25watt, 220volt bulb and a 100watt, 220volt bulb are connected in parallel across a 220volt line. Which bulb will glow more brightly?
Which of following is not same as watt?
Calculate the power in the 20ohm resistance.
Two metals having the same resistivity can be differentiated from their values of:
20μAcurrent flows for 30 seconds in a wire, transfer of charge will be
An electric heater and a fan are marked 1000W, 220 V and 100 W, 220 V respectively. The resistance of fan is
In an open circuit, the current following through the circuit is:
When bulbs are connected in series then generally to find power, we give priority to the relation
Ohms law for an ohmic resistor gives a straight line whose slope gives (if V is along xaxis)
Emf is most closely related to
When we double the voltage in a simple electric circuits we double the
The product of resistance and conductance of a resister is equal to
An electric room radiator, which operates at 50V has resistance of 50. Power of the radiator is approximately,
The emf of a battery is 6V and its internal resistance 0.2. It can deliver maximum power
Terminal potential difference of a battery is equal to its emf when its internal resistance is
Emf and terminal potential are related as
The terminal potential difference of a cell for open circuit is
The VI graph of a conductor at two different temperatures as shown in Fig. The relation between resistance will be
A piece of copper and another of germanium are cooled from room temperature to 77K. The resistance of
Which of the following graph is for semiconductor?
The ‘emf’ is always _______ even when no current is drawn through the battery of cell.
Ohms law for an ohmic resistor gives a straight line whose slope gives (if V is along xaxis)
A charge of 90C passes through a wire in 1 hour and 15 minutes. What is the current in the wire?
Unit of resistance is;
Substances which do not obey Ohm’s law are called
A flat iron is marked “120 V, 600 W”. In normal use, the current in it is:
Electrical energy used per second is given by:
The emf of the cell in the following circuit is 9V. The reading on the high resistance voltmeter is 7.5V what is the current I? (where R =15 ohm)
A primary cell has an emf of 1.5 V. When a 5W resistor is connected across it, the current is 0.2 A. The internal resistance of the cell is
A wire 50 cm long and 1 mm2 in crosssection carries a current of 4 A when connected to a 2V battery. The resistivity of the wire is
A 5 ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is
A heater coil is cut into two equal parts and only one part is now used in heater. The heat generated will now be
Two 32 W/100 V bulbs are connected (i) in series (ii) in parallel to 100 V supply. The power consumed by each in two cases is
Current in an electrolyte is carried by
No current flows between two charged bodies when connected if they have same:
The SI unit of temperature coefficient of resistivity is.
A steady current is passing through a linear conductor of nonuniform crosssection. The net quantity of charge crossing any crosssection per second is;
The specific resistance of a wire varies with its
The drift velocity of free electrons in a conductor is v when a current I is flowing in it. If both the radius and current are doubled, then drift velocity will be;
Which of the given equation shows maximum power output of cell emf E, internal resistance r
The electric current in a metallic conductor is due to the flow of
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