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12th Physics Monthly Test - 3 ( Current Electricity )

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 3 ( Current Electricity )-Aug 2020

Time : 2.30 Hours

Part - A

Generic 2 - Answer All Question

State the principle of potentiometer.

Show on graph. the variation of resistivity with for a typical semiconductor. What is the order resistivity of an insulator? Conductor and semiconductor.

Mention are limitation of carbon resistors.
Derive the expression for power P=VI in electrical circuit.

Define electrical resistivity

Why current is a scalar?

why is terminal voltage of a cell less than its emf?

Define resistance

Draw I - V graph for a conductor. What does the slope represent?

What is (i) thermoelectric current
(Ii) thermocouple.

Distinguish between drift velocity and mobility.

When resistors are connected in series. the effective resistance is increased. Why?
State Kirchhoff’s voltage rule.

What is Peltier effect?

What is Seebeck effect?

Why the resistance of the conductor increases with rise in temperature.

What is Seebeck effect?

Part - B

Generic 3 - Answer All Question

Obtain the condition for bridge balance in Wheatstone’s bridge.

In a circuit containing internal resistance r. Find the power delivered

Calculate the equivalent resistance between A and B in the given circuit.

Determine the number of electrons flowing per second through a conductor, when a current of 32 A flows through it.
Derive an expression of drift velocity and write the relation between drift velocity and mobility.

A potential difference across 24 Ω resistor is 12 V. What is the current through the resistor?

Explain Peltier effect.

A copper wire of cross-sectional area 0.5 mm2 carries a current of 0.2 A. If the free electron density of copper is 8.4 × 1028 m^-3 then compute the drift velocity of free electrons.

Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.

What are carbon resistors? What does the colour indicates?

The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?

Part - C

Generic 5 - Answer All Question

Two metallic wires PI &P2 of the same material & same length but different cross sectional areas Al & A2 are joined together & connected to a source of emf. Find the ratio of the drift velocities of free electrons in the two wires when they are connected (i) in series & (ii) in parallel.

Obtain the condition for bridge balance in Wheatstone's bridge.
Write mathematical relation between mobility & drift velocity of charge carriers in a conductor (ii) mobility & relaxation time (or) mean free time.

A copper wire of 10^-6 m² area of cross section, carries a current of 2 A. If the number of electrons per cubic meter is 8 × 10²⁸, calculate the current density and average drift velocity.

What is potentiometer? Give its constant and principle.

Two cells each of 5V are connected in series across a 8 Ω resistor and three parallel resistors of 4 Ω, 6 Ω and 12 Ω. Draw a circuit diagram for the above arrangement. Calculate i) the current drawn from the cell (ii) current through each resistor

An electronics hobbyist is building a radio which requires 150 Ω in her circuit, but she has only 220 Ω, 79 Ω and 92 Ω resistors available. How can she connect the available resistors to get desired value of resistance?

Two students A & B were asked to pick a resistor of 25 k from a collection of carbon resistors. A picked a resistors with bands of colours of red, green, orange, white. B picked a resistor with bands of colours: black, green, red who picked the correct resistor?

Obtain an expression for electrical conductor

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