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Q. Encircle the correct option.
On which of the following factor the drift velocity does not depend:
(a) The length of the wire (b) The cross-section of the wire
(c) The number of free electrons (d) The magnitude of the electric field
Drift velocity of electrons is independent of
(a) Time consumed (b) The length of the wire
(c) The number of free electrons (d) The strength of the electric field
A 10Ω resistor is connected across the terminals of a 10V battery. The power dissipation of the resistor is
(a) 100W (b) 50W (c) 25W (d) 10W
A heavy duty refrigerator is used about 1000W, if it allowed to run continuously for 10 hours daily, how many kilowatt-hours of energy does it consume in 10 days?
What will be the value of emf if 3A current within 5mins perform work about 900J?
Which one of the following electrical devices helps us to measure the accurate value of emf?
The unit of dynamics charge is:
(a) Coulomb (b) Ohm (c) Ampere (d) Volt
The resistance of a steel wire of particular length and thickness is 100Ω. If the length and the diameter of the wire both are doubled, then the resistivity in Ω-m will be
(a) 1×〖10〗^(-7) Ω-m
How much power dissipation will be increased if current passing through the circuit is increased 100% (let keeping temperature constant)?
(a) 100%
There are 2 resistors of having values 2Ω and 4Ω respectively are connected in series to a 6V battery. The heat dissipated by the 4Ω resistor in 5s will be
(a) 5J
Which of the following statement is correct?
(a) Kirchhoff’s law states that the current traveling towards a junction equals the voltage drop
(b) The current flowing towards a junction is equal to the resistance across the junction, according to Kirchhoff’s law
(c) The current flowing into a junction is equal to the current exiting the junction, according to Kirchhoff’s law
(d) Kirchhoff’s law states that the current traveling towards a junction is equal to the sum of all currents in the circuit
The algebraic sign of an IR drop primarily depends upon the
(a) Direction of flow of current (b) Battery connections
(c) Magnitude of current flowing through it (d) Value of resistance
What will be the nearest value of protected resistance, if LDR having resistance 20Ω is operated at specific intensity of light is to be protect through a series resistance in such a way that up to 12mA current in the provision of 10V potential across the circuit as shown in following figure?
(a) 681Ω (b) 773Ω
(c) 813Ω (d) 973Ω
Which of the following electrical instrument can be used as a null detector in the Wheatstone bridge?
(a) Galvanometer (b) Ammeter (c) Voltmeter (d) Multimeter
Potentiometer can be used for
(a) Comparing two voltages (b) Comparing two currents
(c) Measuring a voltage (d) Measuring a current
In order to achieve high accuracy, the slide wire of a potentiometer should be
(a) As long as possible (b) As short as possible (c) Neither too small not too large (d) very thick
There are _______ types of thermistor
(a) one (b) two (c) three (d) four
Thermistor is special kind of resistor named as
(a) Laser resistor (b) Photo resistor (c) Thermal resistor (d) Electric resistor
What is meant by drift velocity?
Why we use Kirchhoff’s law for circuit problems solution.
Define Kirchhoff’s current rule and Kirchhoff’s voltage rule.
What is the working principle of Galvanometer?
What is LDR? Explain.
Explain the electronic current in a metallic wire as due to the drift of free electrons in the wire.
Explain the term the following terms. A) Drift velocity B) emf C) internal resistance
What is potential divider? Explain.
What is Wheatstone bridge? Explain in detail.
What is a potentiometer? Explain.
Discuss Kirchhoff’s laws in detail.
If 1A current flows through a copper wire having 1〖cm〗^2 area of cross-section and 10km length; also calculate the time required by charge carrier to travel from one to other end of the conductor (Free electron density of copper is 8.5×〖10〗^28 per m^3).
Calculate the flow of charges per unit time inside the emf source having potential 2V and terminals are connected with each other having internal resistance 0.02Ω
Calculate the terminal potential of the emf source if internal resistance of the battery is 10Ω and current and internal potential are 1A and 10V respectively?
There is a copper coil having 2000 number of turns with 0.8mm^2 cross-section are, the length per turn is 80cm. Calculate the resistance of the coil? (Resistivity of copper is 0.02μΩm?
A piece of silver wire has a resistance of 1Ω. What will be the resistance of magnum wire of one third of the length and one third of diameter, if the specific resistance of wire is 30 times that of silver?
Calculate the current that flows in the 1Ω resistor in the following circuit.