Current Electricity Test

Result

Current Electricity Test - 164

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Weekly Quiz Competition

Question 1
4 / -1

A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by ΔT in a time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of the wire is raised by the same amount ΔT in the same time t. The value of N is

A
4

B
6

C
8

D
9

Solution
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

A heater is operated with a power of 1000 W in a 100 V line. It is connected in combination with a resistance of 10 Ω and a resistance R to a 100 V line as shown in figure. What should be the value of R so, that the heater operates with a power of 62.5 W

A
10 Ω

B
62.5 Ω

C

D
5 Ω

Solution
Question 4
4 / -1

The thermo e.m.f. of a thermo-couple is 25µV/° C at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10^–5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is

A
20° C

B
16° C

C
12° C

D
8° C

Solution
Question 5
4 / -1

An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200-volt supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W is

A
10 Ω

B
20 Ω

C
50 Ω

D
100 Ω

Solution
Question 6
4 / -1

A thermo couple develops 200 µV between 0° C and 100°C. If it develops 64 µV and 76 µV respectively between (0° C – 32° C) and (32° C – 70° C) then what will be the thermo emf it develops between 70°C and 100°C?

A
65 µV

B
60 µV

C
55 µV

D
50 µV

Solution
Question 7
4 / -1

A thermocouple is formed by two metals X and Y, metal X comes earlier to Y in Seebeck series. If temperature of hot junction increases beyond the temperature of inversion, then direction of current in thermocouple will be from

A
X to Y through cold junction

B
X to Y through hot junction

C
Y to X through cold junction

D
Both (b) and (c)
Question 8
4 / -1

Consider a cylindrical element as shown in the figure. Current flowing through element is I and resistivity of material of the cylinder is ρ. Choose the correct option out the following

A
Power loss in second half is four times the power loss in first half

B
Voltage drop in first half is twice of voltage drop in second half

C
Current density in both halves are equal

D
Electric field in both halves is equal

Solution
Question 9
4 / -1

Resistance of a voltameter is 2Ω, it is connected in series to a battery of 10 V through a resistance of 3Ω. In a certain time mass deposited on cathode is 1g. Now the voltameter and the 3Ω resistance are connected in parallel with the battery. Increase in the deposited mass on cathode in the same time will be

A
0

B
1.5 g

C
2.5 g

D
2 g

Solution
Question 10
4 / -1

A current of 1.5 A flows through a copper voltameter. The thickness of copper deposited on the electrode surface of area 50 cm² in 20 minutes will be (Density of copper = 9000 kg/m³ and E.C.E. of copper = 0.00033 g/C)

A
2.6 × 10^–5 m

B
2.6 × 10^–4 m

C
1.3 × 10^–5 m

D
1.3 × 10^–4 m

Solution