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The ratio of the lengths densities masses and resistivities of two wires A and B are 1: 2 1: 2 1:1 1: 4 respectively. The ratio of their resistance are:





โœ… Correct Answer: 1

he length of a conductor is halved. Its conductance will be:





โœ… Correct Answer: 2

The resistances in left and right gaps of a metre bridge are 4 and 6 ohm. The balance point is obtained at





โœ… Correct Answer: 2

When cells are connected in series:





โœ… Correct Answer: 1

Two cells of 1.25 V and 0.75 V are connected in parallel. The effective voltage is:





โœ… Correct Answer: 1

Which of the following has the maximum resistance?





โœ… Correct Answer: 1

An electric current is passed through a circuit containing two wires of the same material connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3 then the ratio of the currents passing through the wire will be:





โœ… Correct Answer: 2

The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be:





โœ… Correct Answer: 4

A voltmeter can be constructed from a moving coil galvanometer by:





โœ… Correct Answer: 2

Mark correct option or options.





โœ… Correct Answer: 4

To convert a galvanometer into voltmeter one should connect:





โœ… Correct Answer: 2

The resistance of the series combination of two resistances is S. When they are joined in parallel the total resistance is P. If S = nP then the minimum possible value of n is:





โœ… Correct Answer: 1

The sensitivity of a potentiometer can be increased by:





โœ… Correct Answer: 2

For accurate measurements the resistance of a voltmeter should be:





โœ… Correct Answer: 4

A big dry cell A and a small dry cell B have the same emf. The internal resistance of A:





โœ… Correct Answer: 3

A wire of resistance R is stretched so that its length increases by 10%. The resistance of the wire increases by:





โœ… Correct Answer: 3

Steady current flows in a metallic conductor of non-uniform cross-section. The quantity constant along the length of the conductor is:





โœ… Correct Answer: 4

When battery and galvanometer are interchanged in the case of Wheatstone bridge then:





โœ… Correct Answer: 1

Two identical resistors are connected in parallel then connected in series The effective resistance are in the ratio:





โœ… Correct Answer: 3

To use a moving coil galvanometer as an ammeter one must connect:





โœ… Correct Answer: 2

Which of the following is likely to have the largest resistance?





โœ… Correct Answer: 3

o convert a galvanometer into an ammeter we should connect:





โœ… Correct Answer: 3

Overloading of an electric circuit implies:





โœ… Correct Answer: 1

Two resistances are connected in parallel and a current is sent through the combination. The current divides itself:





โœ… Correct Answer: 1

By increasing the temperature the specific resistance of a conductor and a semiconductor:





โœ… Correct Answer: 3

If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a:





โœ… Correct Answer: 1

The thermistors are usually made of:





โœ… Correct Answer: 3

When cells are arranged in parallel





โœ… Correct Answer: 2

An ammeter of resistance 0.16 ohm is shunted with a resistance of 0.04 ohm which gives a reading of 8 A. The current in the main circuits is





โœ… Correct Answer: 1

he sequence of bands on carbon resistor is brown black brown and gold the value of resistance is either





โœ… Correct Answer: 2

A voltmeter 100 V range is of 9000 ohm resistance and another voltmeter of range 80 V has a resistance of 11000 ohms. This combination is connected across 120 V. The reading of voltmeter of 100 V range will be





โœ… Correct Answer: 1

The e.m.f. of a cell is E when connected across a resistor R the P.D. between the terminals is V. The internal resistance of the cell is given by





โœ… Correct Answer: 2

With a cell of e. m. f. 1.5 V the balancing point is obtained at a distance of 60 cm from one end of a potentiometer wire. Find the p.d. between the two ends of the wire if its total length is 1 m.





โœ… Correct Answer: 3

When cells are connected in series





โœ… Correct Answer: 1

A cell of e. m. f. E is connected across resistance R. The potential difference between the terminals of a cell is found to be V. The internal resistance of the cell must be





โœ… Correct Answer: 1

Mixed groups of cells will send the maximum current in the external circuit when total internal resistance is





โœ… Correct Answer: 3

A battery of e. m. f. E and internal resistance r is being charged with current i. The terminal potential will be





โœ… Correct Answer: 2

In a closed circuit the e.m.f. and internal resistance of a battery are E and R respectively. If an external resistance R is connected to the battery the current flowing through the circuit shall be





โœ… Correct Answer: 2

A voltmeter reading up to 1000 m V is calibrated with a potentiometer. An e. m. f. of 1.08 V is balanced across 5.4 m of the wire. The balanceing length is 4.55 m when the voltmeter reads 0.9 V. The error in the voltmeter reading is





โœ… Correct Answer: 1

A voltmeter 100 V range is of 9000 ohm resistance and another voltmeter of range 80 V has a resistance of 11000 ohms. This combination is connected across 120 V.The reading of voltmeter having resistance 11000 ohm is





โœ… Correct Answer: 3

The current from the battery in the above circuit is





โœ… Correct Answer: 1

A 20 ohm resistance with an unknown resistance R in series is connected to the potentiometer arrangement having a constant current in its main circuit. If p. d. across 2 ohm resistance is balanced at 300 cm length and p. d. across R at 360 cm length then R is





โœ… Correct Answer: 1

Two identical resistors are connected in parallel then in series. The effective resistances are in the ratio





โœ… Correct Answer: 3

A bettery of e.m. f. E and in internal resistance r is being used and is supplying current i in the circuit. The terminal potential will be





โœ… Correct Answer: 3

A voltmeter reading up to 1000 m V is calibrated with a potentiometer. An e. m. f. of 2.08 V is balanced across 8.4 m of the wire. The balancing length is 3.68 m when the voltmeter reads 0.9 V. The error in the voltmeter reading is





โœ… Correct Answer: 1

A wire of resistance R is stretched so that its length increases by 10%. The resistance of the wire increases by





โœ… Correct Answer: 3

The plates of a capacitor are charged to a potential difference of V volts and then connected across a resistor. After one second the potential difference between the plates is V/3 then after 2 sec. from the start the potential difference between the plates is





โœ… Correct Answer: 1

When the cells of different e. m. fs. and internal resistances are connected in parallels





โœ… Correct Answer: 4

If internal resistance of cells is large as compared to the external resistance then the cells should be connected in





โœ… Correct Answer: 2

The potential gradient along the length of a uniform wire is 5 V per metre. There at two points A and B on the wire which are 20 cm and 80 cm on the metre scale fitted along the wire. The p. d. between them will be





โœ… Correct Answer: 2

A circuit whose resistance is R is connected to n similar cells. If the current in the circuit is the same whether the cells are connected in series or in parallel then the internal resistance r of each cell is given by





โœ… Correct Answer: 1

An ammeter of resistance 0.16 ohm shunted with a resistance of 0.04 ohm gives a reading of 8 A. The current in the main circuit is





โœ… Correct Answer: 1