# Physics Ch 2 Class 12 Current Electricity

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Unit of emf?

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The unit of resistivity is:

NUMS 2020
Physics
Current Electricity
Elimination Tool:

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A generator of e.m.f. 80 V has an internal resistance of 0.04 Ω. If its terminal voltage is 75 V, determine the current.

NTS 2013
Physics
Current Electricity
Elimination Tool:

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Conductivity equals:

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A battery has an e.m.f. of 4 V and internal resistance ‘r’. When this battery is connected to an internal resistance of 2 ohms, a current of 1 amp flows in the circuit. How much current will flow if the terminals of the battery are connected directly:-

NTS 2010
Physics
Current Electricity
Elimination Tool:

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An electric bulb is rated at 220 V, 100 W. What is its resistance?

NUMS 2016
Physics
Current Electricity
Elimination Tool:

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A galvanometer has a resistance of 20 ohms and a full-scale deflection when a current of 0.001 ampere flows in it. What is the value of the series resistance to convert it into a voltmeter of range 10 volts?

NTS 2014
Physics
Current Electricity
Elimination Tool:

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A thermocouple is immersed in water at 373 K and the other in ice at 273K. The emf of the thermocouple Is 90 (μ)V for each 1 K difference in temperature between junctions, and the thermocouple resistance is 6 Ω. What current will flow in the galvanometer connected in series with an internal resistance of 30ohms?

NTS 2010
Physics
Heat and Thermodynamics
Current Electricity
Elimination Tool:

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Value of resistivity of iron Is

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0.75 A current flows through an iron wire when a battery of 1.5 volts is connected across its ends. The length of the wire 5.0 m and its cross-sectional area is 2.5 x 10-7 m2. What is the resistivity of iron?

NTS 2015 DUHS and JSMU
Physics
Current Electricity
Elimination Tool:

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If two or more resistors are joined to each other side by side, this combination is called:

NUMS 2018
Physics
Current Electricity
Elimination Tool:

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When charge flows through a wire, it produces:

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Resistivity of Hg is ohmmeter

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A uniform wire of resistance 3 ohm is folded in such a way that it forms an equilateral triangle, then what is it’s resistance across the ends of any two vertices?

NUMS 2019 Cancelled
Physics
Current Electricity
Elimination Tool:

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mho is the unit of 7

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The electrons in a conductor drift with a velocity of:

NUMS 2019 Reconduct
Physics
Current Electricity
Elimination Tool:

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Three resistors R1, R2 and R3 are connected in series. If R1 > R2 > R3, the equivalent resistance will be:

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An ammeter reads up to 1 A. Its internal resistance is 0.81 Ω. To increase the range to 10 A, the value of the required shunt is:

NTS 2012
Physics
Current Electricity
Elimination Tool:

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A and B are bulbs connected in series with 40-volt battery and a bulb C is connected with 40-volt battery Glow of bulbs will be:

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The resistivity in SI units is measured in:

NTS 2016 DUHS & JSMU
Physics
Current Electricity
Elimination Tool:

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If a wire of resistance R is stretched into double of its length, then it’s resistance becomes _________.

NUMS 2019 Reconduct
Physics
Current Electricity
Elimination Tool:

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The deviation of I-V graph from straight line is due to:

NUMS 2016
Physics
Current Electricity
Elimination Tool:

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A battery of 6 volts is connected to two resistors of 3 ohm and 2 ohm joined together in series. What will be the current through the circuit?

NTS 2016 SMBBMC
Physics
Current Electricity
Elimination Tool:

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A 100 watt bulb is operated by 240 volts, the current through the bulb will be:

NTS 2012
Physics
Current Electricity
Elimination Tool:

When a conductor of a cross-sectional area 5×10-6 m2 carries a current of 6 A, the drift velocity of the conduction electrons is 1.2-4 x 10-1 ms1-. What is the number density (number per unit volume) of the conduction electrons?

NTS 2010
Physics
Current Electricity
Elimination Tool:

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The potential difference between the terminals of a battery in an open circuit is 2.2 V. When it is connected across a resistance of 5.0 Ω, the potential falls to 1.8 V. What is the internal resistance of the battery?

NTS 2015 DUHS and JSMU
Physics
Current Electricity
Elimination Tool:

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A 50 watt bulb is operated by 120 volts. What is the current through the bulb?

NTS 2016 SMBBMC
Physics
Current Electricity
Elimination Tool:

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If a voltage of 9V is applied between ends of a wire whose resistance is 0.2 ohm, what will be the resulting current?

NTS 2015 SMBBMC
Physics
Current Electricity
Elimination Tool:

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The power of an electric bulb is 100W. It is connected to 110V power supply. The resistance of electric bulb will be?

NUMS 2020
Physics
Current Electricity
Elimination Tool:

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One kilowatt-hour is commonly termed as one commercial unit of electric energy which is equal to:

PMC 2020
Physics
Current Electricity
Elimination Tool:

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Drift velocity is of the order:

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The instrument(s) which work on the principle of Wheatstone bridge is/are:

NTS 2012
Physics
Current Electricity
Elimination Tool:

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Which device is used to measure the potential difference between two points of a conductor in the laboratory?

NUMS 2020
Physics
Current Electricity
Elimination Tool:

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Three resistors of 7 ohm, 5 ohm and 8 ohm are connected in series. Current flow will be maximum through:..

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If a magnetic field around a current carrying wire is anticlockwise then the direction of current flow is a

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Terminal voltage Vi of the battery is greater than emf of the battery when:

NUMS 2020
Physics
Current Electricity
Elimination Tool:

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If length of a wire is Increased two times and Its cross-sectional area is reduced to half, the resistance of the wire will be:

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What is the constant of proportionality in ohms law:

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A battery whose emf is 40 V has an internal resistance of 5 Ohms. If this battery is connected to a 15 Ohms resistor ‘R’, what will be the voltage drop across ‘R’:

NTS 2010
Physics
Current Electricity
Elimination Tool:

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Three resistors connected in series have Individual voltages labeled V1, V2, and V3, respectively. Which of the following expresses the value of the total voltage V, taken over the three resistors
together?

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Siemen is the SI unit of:

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If you wish to decrease the resistance of a circuit, you will add the resistors in ________.

NTS 2014
Physics
Current Electricity
Elimination Tool:

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The fractional change in resistance per kelvin is known as:

NUMS 2016
Physics
Current Electricity
Elimination Tool:

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