Current Electricity Test

Result

Current Electricity Test - 162

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Question 1
4 / -1

The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30µV per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of 3 × 10^–7 amp is

A
0.5 degree

B
1.0 degree

C
1.5 degree

D
2.0 degree

Solution
Question 2
4 / -1

Antimony and bismuth are usually used in a thermocouple, because

A
Negative thermal e.m.f. is produced

B
Constant thermal e.m.f. is produced

C
Lower thermal e.m.f. is produced

D
Higher thermal e.m.f. is produced
Question 3
4 / -1

Above neutral temperature, thermo e.m.f. in a thermocouple

A
Decreases with rise in temperature

B
Increases with rise in temperature

C
Remains constant

D
Changes sign
Question 4
4 / -1

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

A
290° C, 580° C

B
270° C, 580° C

C
270° C, 500° C

D
290° C, 540° C

Solution
Question 5
4 / -1

Consider the following two statements A and B and identify the correct choice given in the answers
A. Duddells thermo-galvanometer is suitable to measure direct current only
B. Thermopile can measure temperature differences of the order of 10^–3° C

A
Both A and B are true

B
Both A and B are false

C
A is true but B is false

D
A is false but B is true
Question 6
4 / -1

The inversion temperature of a copper-iron thermocouple is 540° C when the cold junction temperature is 0° C. If the cold junction temperature is increased by 10° C, then the inversion temperature and neutral temperature of the thermocouple respectively are

A
270° C and 530° C

B
270° C and 550° C

C
280° C and 530° C

D
280° C and 550° C
Question 7
4 / -1

The resistance of the filament of an electric bulb changes with temperature. If an electric bulb rated 220 volt and 100 watt is connected to (220 × 0.8) volt sources, then the actual power would be

A
100 × 0.8 watt

B
100 × (0.8)² watt

C
Between 100 × 0.8 watt and 100 watt

D
Between 100 × (0.8)² watt and 100 × 0.8 watt

Solution
Question 8
4 / -1

An immersion heater is rated 836 watt. It should heat 1 litre of water from 10° C to 40° C in about

A
200 sec

B
150 sec

C
836 sec

D
418 sec

Solution
Question 9
4 / -1

A house is served by 220 V supply line in a circuit protected by a 9 ampere fuse. The maximum number of 60 W lamps in parallel that can be turned on, is

A
44

B
20

C
22

D
33

Solution
Question 10
4 / -1

Water boils in an electric kettle in 15 minutes after switching on. If the length of the heating wire is decreased to 2/3 of its initial value, then the same amount of water will boil with the same supply voltage in

A
15 minutes

B
12 minutes

C
10 minutes

D
8 minutes

Solution