Current Electricity Test

Result

Current Electricity Test - 123

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Weekly Quiz Competition

Question 1
4 / -1

A

B

C

D

Solution
Question 2
4 / -1

For a certain thermocouple, if the temperature of the cold junction is 0°C, the neutral temperature and inversion temperature are 285°C and 570°C, respectively. If the cold junction is brought to 10°C, then the new neutral and inversion temperatures are respectively

A
285°C and 560°C

B
285°C and 570°C

C
295°C and 560°C

D
275°C and 560°C

Solution
Question 3
4 / -1

Consider the following statements A and B and identify the correct answers given below:
Statement A Peltier coefficient is numerically equal to the potential difference across the junctions of the thermocouple through which current is flowing.
Statement B According to Thomson, energy is neither absorbed nor evolved at the junction of a thermocouple but is observed or evolved only along the lengths of both the conductors.

A
Both Statement A and Statement B are correct

B
Both Statement A and Statement B are incorrect

C
Statement A is correct but Statement B is incorrect

D
Statement A is incorrect but Statement B is correct
Question 4
4 / -1

Two metallic wires of the same material and same length have different diameters. If we connect them in series across a battery the heat produced is H₁. If we connect them in parallel to the same battery, the heat produced during the same time is H₂. Then

A
H₁ = H₂

B
H₁ > H₂

C
H₁ < H₂

D
It will depend upon the voltage of battery

Solution
Question 5
4 / -1

What will be the wattage of a 50 W, 200 V lamp when used on 160 V power supply?

A
32 W

B
64 W

C
64 W

D
128 W

Solution
Question 6
4 / -1

What is the material for electric fuse?

A
Cu

B
Constantan

C
Tin-lead alloy

D
Nichrome
Question 7
4 / -1

A constant potential difference is applied across the ends of a wire. Which one of the following operations will reduce the rate of heat generation to half?

A
Both length and diameter are halved

B
Both length and diameter are doubled

C
Diameter is doubled and length is halved

D
Diameter is halved and lengh is doubled

Solution
Question 8
4 / -1

Two electric bulbs, one of 200 volt – 60 watt and the other of 200 volt – 200 watt are connected in a house wiring circuits,

A
they have equal currents through them

B
the resistance of the filaments in both the bulbs is same

C
the resistance of the filament in 60 watt bulb is more than the resistance in 200 watt bulb

D
the resistance of the filament in 200 watt bulb is more than the resistance in 60 watt bulb.

Solution
Question 9
4 / -1

In the fig. all bulbs are identical. The bulb that lights most brilliantly is

A
1 only

B
2 only

C
2 and 4

D
1 and 5
Question 10
4 / -1

A, B, C in the Fig. are identical lamps. What changes occur in the brightness of the lamps when its switch S is closed?

A
Brightness of A increases but that of B decreases

B
Brightness of A remains the same but that of B decreases

C
Brightness of both A and B decreases

D
Brightness of A increases but that of B remains the same