The resistor R 1 dissipates power P when connected to a generator. If a resistor R 2 is inserted in series with R 2 , the power dissipated by R 1

may increase or decrease depending on the values of R1 and R2

(i), (ii) and (iii) are correct

The thermo emf of a thermocouple varies with the temperature θ of the hot junction as E = a θ + b θ 2 in volts where the ratio a/b is 700ºC. If the cold junction is kept at OºC, then neutral temperature is

no neutral temperature is possible for this thermocouple

JEE Questions for Physics Current Electricity Ii Quiz 3

The graph represents the current voltage behaviour of a water voltameter. Spot the correct explanation:
Physics-Current Electricity II-66418.png

Physics-Current Electricity II-66418.png

0%
Ohm’s law is obeyed but only for potential difference larger than the back e.m.f.
0%
Electrolysis do not obey Ohm’s law
0%
Ohm’s law is not valid for low voltages
0%
Dissociation takes place at E1 and it obey’s Ohm’s law thereafter

What carries current in an electrolyte?

0%
electrons only
0%
– ve ions only
0%
+ ve ions only
0%
both +ve and – ve ions

The electrochemical equivalent of magnesium is 0.126 mg/C. A current of 10 A is passed in a suitable solution for ½ hour. The mass of magnesium deposited in gram will be

0%
0.0378
0%
0.227
0%
0.378
0%
2.27

A current of 1 A is passed through a dilute sulphuric acid for sometime to liberate 1 g of oxygen. How much hydrogen is liberate during this period? [Faraday constant F = 96500 C/mol]

0%
2g
0%
1g
0%
0.5g
0%
0.125g

Physics-Current Electricity II-66493.png

0%
0%
2)
0%
0%

An ammeter reads 0.90 A when connected in series with a silver voltameter that deposits 2.60 gram of silver in 40 minutes. By what percentage is the ammeter reading is correct? Atomic weight of silver = 108 and 1 F = 96500 C?

0%
5 %
0%
7 %
0%
-5 %
0%
-7 %

In an electroplating experiment, m g of silver is deposited when 4 A of current flows for 2 minutes. The amount in g of silver deposited by 6 A of current for 40 seconds will be

0%
4 m
0%
2 m
0%
m/2
0%
m/4

The Peltier coefficent of a thermo couple of metals A and B at junction temperature T is given by

0%
0%
2)
0%
0%

Thomson coefficient σ, temperature T (in kelvin and Seebeck coefficent S are related as

0%
0%
2)
0%
0%

A 5ºC rise in temperature is observed in a conductor by passing a current. When the current is doubled, the rise in temperature will be approximately

0%
10ºC
0%
12ºC
0%
16ºC
0%
20ºC

The resistor R₁ dissipates power P when connected to a generator. If a resistor R₂is inserted in series with R₂, the power dissipated by R₁

0%
increases
0%
decreases
0%
remains the same
0%
may increase or decrease depending on the values of R1 and R2

Physics-Current Electricity II-66434.png

0%
(i), (ii) are correct
0%
(i), (ii) and (iii) are correct
0%
all are wrong
0%
all are correct

Two resistance filaments of same length are connected first in series and then in parallel. Find the ratio of power dissipated in both cases assuming that equal current flows in the main circuit.

0%
4 : 1
0%
1 : 4
0%
1 : 2
0%
2 : 1

For a thermocouple the neutral temperature is 270ºC when its cold junction is at 20ºC. What will be the neutral temperature and the temperature of inversion when the temperature of cold junction is increased to 40ºC ?

0%
290ºC, 580ºC
0%
270ºC, 580ºC
0%
270ºC, 500ºC
0%
290ºC, 540ºC

If θ_i is the inversion temperature, θ_n is the neutral temperature, θ_c is the temperature of cold junction, then

0%
0%
2)
0%
0%

The mass of a product liberated on anode in an electrochemical cell depends on

0%
(I t)1/2
0%
I t
0%
I/t
0%
I2t

How much current should be passed through acidified water for 100s to liberate 0.224 litre of hydrogen?

0%
22.4 A
0%
19.3 A
0%
9.65 A
0%
1 A

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 V a.c., supply line. The power drawn by the combination in each case respectively will be

0%
50 W, 100 W
0%
100 W, 50 W
0%
200 W, 150 W
0%
50 W, 200 W

A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The watt-hour efficiency of the battery is

0%
82.5 %
0%
80 %
0%
90 %
0%
87.5 %

Time taken by a 836 W heater to heat one litre of water from 10ºC to 40ºC is

0%
50s
0%
100s
0%
150s
0%
200s

The thermo emf of a thermocouple varies with the temperature θ of the hot junction as E = a θ + b θ² in volts where the ratio a/b is 700ºC. If the cold junction is kept at OºC, then neutral temperature is

0%
700ºC
0%
350ºC
0%
1400ºC
0%
no neutral temperature is possible for this thermocouple

Electrochemical equivalent of a metal is 3.3 × 10^-7 kg/coulombs. The mass of the metal liberated at the cathode when a 3A current is passed for 2 seconds will be

0%
0%
2)
0%
0%

The temperature of inversion of a thermocouple is 620ºC and the neutral temperature is 300ºC. What is the temperature of cold junction?

0%
40ºC
0%
20ºC
0%
320ºC
0%
– 20ºC

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

0%
halved
0%
one fourth
0%
four times
0%
doubled

Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are z₁ and z₂ respectively and charge which flows through the silver voltameter is

0%
0%
2)
0%
0%

A rigid container with thermally insulated walls contains a coil of resistance 100Ω, carrying current 1A. change in internal energy after 5 minute will be

0%
10 kJ
0%
0 kJ
0%
20 kJ
0%
30 kJ

For ensuring dissipation of same energy in all three resistors (R₁, R₂, R₃) connected as shown in Fig., their values must be related as
Physics-Current Electricity II-66461.png

Physics-Current Electricity II-66461.png

0%
R1 = R2 = R3
0%
R2 = R3 and R1 = 4R2
0%
R2 = R3 and R1 = R2/4
0%
R1 = R2 + R3

A 5.0 ampere current is set up in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by

0%
0%
2)
0%
0%

A capacitor of capacitance 3μF is first charged by connecting across a 10 V battery, then it is allowed to get discharged through 2Ω and 4Ω resistor by closing the key K Fig. The total energy dissipated in 2Ω resistors is equal to
Physics-Current Electricity II-66468.png

Physics-Current Electricity II-66468.png

0%
0.15 mJ
0%
0.5 mJ
0%
0.05 mJ
0%
1.0 mJ

In the circuit shown in the Fig., the 5Ω resistance develops 20.00 cal/s due to the current flowing through it. The heat developed in 2Ω resistance (in cal/s) is
Physics-Current Electricity II-66470.png

Physics-Current Electricity II-66470.png

0%
23.8
0%
14.2
0%
11.9
0%
7.1

The resistor in which maximum heat will be produced is
Physics-Current Electricity II-66472.png

0%
2 Ω
0%
3 Ω
0%
4 Ω
0%
6 Ω

Maximum power developed across resistance R in the circuit shown in Fig. is
Physics-Current Electricity II-66474.png

0%
25 W
0%
50 W
0%
75 W
0%
100 W

A tap supplies water at 22ºC. A man takes 1 litre water per minute at 37ºC from the geyser. The power of geyser is

0%
525 W
0%
1575 W
0%
1050 W
0%
2100 W

Physics-Current Electricity II-66477.png

0%
0%
2)
0%
0%

The effective resistance of a n number of resistors connected in parallel in x ohm. When one of the resistors is removed, the effective resistance becomes y ohm. The resistance of the resistor that is removed is....

0%
0%
2)
0%
0%

when a cell is connected to a resistance R₁ the rate at which heat is generated in it is the same as when the cell is connected to a resistance R₂ (1 ) the internal resistance of the cell is....

0%
0%
2)
0%
0%

Length of a wire of resistance RΩ is increased to 10 times, so its resistance becomes 1000Ω, therfore R = .... (The volume of the wire remains same during increase in length)

0%
0.01 Ω
0%
0.1 Ω
0%
1 Ω
0%
10 Ω

Physics-Current Electricity II-66498.png

0%
0%
2)
0%
0%

Two batteries each of emf 2V and internal resistance 1Ω are connected in series to a resistor R. Maximum Possible power consumed by the resistor = ....

0%
3.2 W
0%
2)
0%
0%
2W

In an experiment to measure the intenal resistance of a cell by a potentiometer it is found that all the balance points at a length of 2m when the cell is shunted by a 5 ohm resistence and is at a length of 3m when the cell is shunted by a 10 ohm resistance, the internal resistance of the cell is then :

0%
1.5 Ω
0%
10 Ω
0%
15 Ω
0%
1 Ω

Two wires of the metal have the same length but their cross-sections are in the ratio 3:1 They are joined in series: The resistance of the thicker wire is 10 Ω. The total tesistance of the combination will be

0%
40
0%
2)
0%
0%
100

A wire of length L is drawn such that its diameter is reduced to half of its original diameter. If the resistance of the wire were 10Ω, its new resistance would be

0%
40 Ω
0%
60 Ω
0%
120 Ω
0%
160 Ω

Which of the following has negative temperature coefficient of resistance?

0%
Fe
0%
C
0%
Mn
0%
Ag

A parallel combination of three resistors takes a current of 7.5 A form a 30 V supply, It the two resistors are 10 Ω and 12 Ω find which is the third one?

0%
4 Ω
0%
15 Ω
0%
12 Ω
0%
22 Ω

A potentiometer wire has length 10 m and resitance 20Ω. A 2.5V battery of negligble internal resistance is connected across the wire with an 80Ω series resistance. The potential gradient on the wire will be:

0%
0%
2)
0%
0%

The drift velocity of free electrons through a conducting wire of radius r, carrying current I, is if the same current is passed through a conductor of radius 2r what will be the drift velocity?

0%
0%
2)
0%
0%

A carbon resistor has a set of coaxial coloured rings in the order brown, violet brown and silver. The value of resistance (in ohms) is

0%
0%
2)
0%
0%

A cross a wire of length l and thickness d, a p.d of V is applied. If the p.d is doubled the dirft velocity becomes....

0%
becomes double
0%
becomes half
0%
Close not change
0%
becomes Zero

The masses of three wires of copper are in the ratio of 1:3:5 and their lengths are in the ratio of 5:3:1. The ratio of their electrical resistance is:

0%
1 : 1 : 1
0%
1 : 3 : 5
0%
5 : 3 : 1
0%
125 : 15 : 1

Two resistors when connected in parallel have an equivalent of 2Ω and when in series of 9Ω The values of the two resistors are.

0%
2 Ω and 9 Ω
0%
3 Ω and 6 Ω
0%
4 Ω and 5 Ω
0%
2 Ω and 7 Ω

JEE Questions for Physics Current Electricity Ii Quiz 3 - MCQExams.com

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JEE Questions for Physics Current Electricity Ii Quiz 3 - MCQExams.com

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Practice Physics Quiz Questions and Answers

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