Current Electricity Test

Result

Current Electricity Test - 126

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Weekly Quiz Competition

Question 1
4 / -1

A
(i), (ii) are correct

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

C
all are wrong

D
all are correct
Question 2
4 / -1

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.

A
4 : 1

B
1 : 4

C
1 : 2

D
2 : 1

Solution
Question 3
4 / -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 ?

A
290ºC, 580ºC

B
270ºC, 580ºC

C
270ºC, 500ºC

D
290ºC, 540ºC

Solution
Question 4
4 / -1

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

A

B

C

D

Solution
Question 5
4 / -1

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

A
(I t)^1/2

B
I t

C
I/t

D
I²t

Solution
Question 6
4 / -1

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

A
22.4 A

B
19.3 A

C
9.65 A

D
1 A

Solution
Question 7
4 / -1

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

A
50 W, 100 W

B
100 W, 50 W

C
200 W, 150 W

D
50 W, 200 W

Solution
Question 8
4 / -1

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

A
82.5 %

B
80 %

C
90 %

D
87.5 %

Solution
Question 9
4 / -1

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

A
50s

B
100s

C
150s

D
200s

Solution
Question 10
4 / -1

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

A
700ºC

B
350ºC

C
1400ºC

D
no neutral temperature is possible for this thermocouple

Solution