# Current Electricity! Play This Trivia Quiz

15 Questions | Total Attempts: 1666  Settings  Electricity is a form of energy that is obtained from mechanical, solar just to mention but a few of the many energy sources. The electricity moves in currents through wires. The quiz below is this subject. All the best.

• 1.
Given three resistors, how many different combinations of these three resistances can be made
• A.

Three

• B.

Four

• C.

Five

• D.

Six

• 2.
In the Bohr’s model of hydrogen atom, the electron moves around the nucleus in circular orbit of radius 5 ⤬ 10–11 m. Its time period is 1.5 ⤬ 10–16 s. The current associated with electron motion is
• A.

Zero

• B.

1.6 ⤬ 10–19 A

• C.

1.07 ⤬ 10–3 A

• D.

0.17 A

• 3.
The temperature (T) dependence of resistivity (p) of a semiconductor is represented by
• A.
• B.
• C.
• D.
• 4.
Resistance n, each of r Ω, when connected in parallel give an equivalent resistance of R Ω. If these resistances were connected in series, the combination would have a resistance in Ω, equal to
• A.

N2R

• B.

R / n2

• C.

R / n

• D.

NR

• 5.
The current in the arm CD of the circuit will be
• A.

I1 + i2

• B.

I2 + I3

• C.

I1 + i3

• D.

I1 – i2 + i3

• 6.
The bulbs A, B and C are connected as shown in Figure. The bulbs B and C are identical. If the bulb C is fused,
• A.

Both A and B will glow more brighty,

• B.

Both A and B will glow less brightly,

• C.

A will glow less brightly and B will glow more brightly,

• D.

A will glow more brightly and B will glow less brightly.

• 7.
If R1 and R2 are the filament resistances of 200 watt and a 100 watt bulb respectively, both designed to run at the same voltage, then
• A.

R1 is four times R2

• B.

R2 is four times R1

• C.

R1 is two times 3R2

• D.

R2 is two times R1

• 8.
If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
• A.

Current drop

• B.

Potential drop

• C.

No current drop

• D.

No potential drop

• 9.
A house wiring supplied with a 220 V supply line is protected by a 6 ampere fuse. The maximum number of 60 W bulbs is parallel that can be turned on is
• A.

11

• B.

22

• C.

33

• D.

66

• 10.
An electric heating element consumes 500 W, when connected to a 100 V line. If the line voltage becomes 150V, the power consumed will be:
• A.

500 W

• B.

750 W

• C.

1000 W

• D.

1125 W

• 11.
A 100 W bulb B1 and two 60 W bulb B2 and B3 are connected to a 250V source as shown in the Figure. Now W1, W2 and W3 are the output powers of the bulbs B1, B2 and B3 respectively. Then
• A.

W1 > W2 = W3

• B.

W1 < W2 = W3

• C.

W1 < W2 < W3

• D.

W1 > W2 = W3

• 12.
In a copper voltameter, mass deposited in thirty seconds is m grams. If the time current graph is as shown in figure. E.C.E. of copper is (current in milli ampere)
• A.

0.1 m

• B.

0.5 m

• C.

0.6 m

• D.

M

• 13.
Consider the following two statements (i) Free-electro density is different in different metals. (ii) Free-electro density in a metal depends on temperature. Seebeck effect is caused
• A.

Due to (i) but not due to (ii)

• B.

Due to (ii) but not due (i)

• C.

Due to both (i) and (ii)

• D.

Neither due to (i) nor due to (ii)

• 14.
If the electric current in a lamp decreases by 5 %, then the power output decreases by:
• A.

2.5%

• B.

5%

• C.

10%

• D.

20%

• 15.
The thermo e.m.f. of a thermo couple varies with the temperature of the hot junction as E = a 𝜃 + b 𝜃2 in bolts where the ratio a/b is 700°C. If the cold temperature is kept at 0°C, then the neutral temperature is
• A.

700°C

• B.

350°C

• C.

1400°C

• D.

No neutral temperature is possible for this thermocouple

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