Current Electricity Test

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Current Electricity Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

A student has 10 resistors of resistancer ‘r’.The minimum resistance made by him from given resistors is

A
10r

B
r/10

C
r/100

D
r/5

Solution

To obtain minimum resistance, all resistors must be connected in parallel. Hence equivalent resistance of combination = r/10
Question 2
1 / -0

By a cell a current of 0.9 A flows through 2 ohm resistor and 0.3 A through 7 ohm resistor. The internal resistance of the cell is

A
0.5Ω

B
1.0Ω

C
1.2Ω

D
2.0Ω

Solution

0.9 (2 + r) = 0.3 (7 + r)

6 + 3r = 7 + r

⇒ r = 0.5Ω
Question 3
1 / -0

Kirchhoff's second law is based on the law of conservation of

A
Charge

B
Energy

C
Momentum

D
Sum of mass and energy

Solution

Kirchhoff's second law is based on the law of conservation of energy.
Question 4
1 / -0

In identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The current through R is

A
nE/R+nr

B
nE/nR+r

C
E/R+nr

D
nE/R+r

Solution

Total e.m.f. = nE, Total resistance R + nr

i = nE/R+nr
Question 5
1 / -0

Assertion: Two electric bulbs of 50 and 100 W are given. When connected in series 50 W bulb glows more but when connected parallel 100 W bulb glows more

Reason: In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion

B
If both assertion and reason are true but reason is not the correct explanation of the assertion

C
If assertion is true but reason is false

D
If the assertion and reason both are false

Solution

Resistance of 50 W bulbs is two times the resistance of 100 W bulb. When bulbs are connected in series, 50 W bulb will glow more as P = i²R(current remains same in series).

In parallel the 100 W bulb will glow more as P = V²R (potential difference remain same in parallel).
Question 6
1 / -0

Resistance of one carbon filament and one tungsten lamp are measured individually when the lamp are lit and compared with their respective resistances when cold. Which one of the following statements will be true?

A
Resistance of the carbon filament lamp will increase but that of the tungsten will diminish when hot

B
Resistance of the tungsten filament lamp will increase but that of carbon will diminish when hot

C
Resistances of both the lamps will increase when hot

D
Resistances of both the lamps will decrease when hot

Solution

R of conductor ∝ Temperature and R of semiconductor ∝ 1/Temperature

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Current Electricity Test - 18

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Current Electricity Test - 18

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Question 1

10r

r/10

r/100

r/5

Solution

Question 2

0.5Ω

1.0Ω

1.2Ω

2.0Ω

Solution

Question 3

Charge

Energy

Momentum

Sum of mass and energy

Solution

Question 4

nE/R+nr

nE/nR+r

E/R+nr

nE/R+r

Solution

Question 5

If both assertion and reason are true and the reason is the correct explanation of the assertion

If both assertion and reason are true but reason is not the correct explanation of the assertion

If assertion is true but reason is false

If the assertion and reason both are false

Solution

Question 6

Resistance of the carbon filament lamp will increase but that of the tungsten will diminish when hot

Resistance of the tungsten filament lamp will increase but that of carbon will diminish when hot

Resistances of both the lamps will increase when hot

Resistances of both the lamps will decrease when hot

Solution

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