Test: Electrical Energy & Power (NCERT) - NEET MCQ

Test: Electrical Energy & Power (NCERT) - NEET MCQ

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5 Questions MCQ Test NCERTs at Fingertips: Textbooks, Tests & Solutions - Test: Electrical Energy & Power (NCERT)

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Test: Electrical Energy & Power (NCERT) - Question 1

If voltage across a bulb rated 220V, 100W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

Detailed Solution for Test: Electrical Energy & Power (NCERT) - Question 1

Power, P = V2/R
As the resistance of the bulb is constant
∴ ΔP/P = 2ΔV / V
% decrease in power = ΔP/P × 100
= 2ΔV/V × 100
= 2 × 2.5% = 5%

Test: Electrical Energy & Power (NCERT) - Question 2

Four wires of the same diameter are connected, in turn, between two points maintained at a constant potential difference. Their resistivities and lengths are; ρ and L (wire 1), 1.2ρ and 1.2L (wire 2), 0.9ρ and 0.9L (wire 3) and ρ and 1.5L (wire 4). Rank the wires according to the rates at which energy is dissipated as heat, greatest first,

Detailed Solution for Test: Electrical Energy & Power (NCERT) - Question 2

Resistance of a wire, R = ρl/A
Rate of energy dissipated as heat is
H = V2/R = V2A/ρl
For a wire 1,

For a wire 2,

For a wire 3,

For a wire 4,

∴H3 > H1 > H2 > H4.

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Test: Electrical Energy & Power (NCERT) - Question 3

A heater coil is rated 100 W, 200 V. It is cut into two idential parts. Both parts are connected together in parallel, to the same source of 200 V. The energy liberated per second in the new combination is

Detailed Solution for Test: Electrical Energy & Power (NCERT) - Question 3

The resistance of heater coil,

= 400Ω
The resistance of either half part = 200 Ω.
Equivalent resistance when both parts are connected in parallel.

The energy liberated per second when the combination is connected to a source of 200 V,

= 400 J

Test: Electrical Energy & Power (NCERT) - Question 4

In the circuit shown in figure heat developed across 2Ω, 4Ω and 3Ωresistances are in the ratio
​​​​​​

Detailed Solution for Test: Electrical Energy & Power (NCERT) - Question 4

Current through 2Ω,

Hence produced per second, H1
=
Current through, 4Ω,

Hence produced per second H2

Current through, 3Ω,I
Heat produced, H3 = I2 × 3 = 3I2

∴ H1 : H2 : H3 = 8 : 4 : 27

Test: Electrical Energy & Power (NCERT) - Question 5

Two 2Ω resistances are connected in parallel in circuit X and in series in circuit Y. The batteries in the two circuits are identical and have zero internal resistance. Assume that the energy transferred to resistor A in circuit X within a certain time is W. The energy transferred to resistor B in circuit Y in the same time will be

Detailed Solution for Test: Electrical Energy & Power (NCERT) - Question 5

In a circuit X, both the resistance are in parallel, Therefore V is the same and, Power (energy transferred in unit time) is
V2/2 = W
In a circuit Y, both resistance are in series.
Therefore, VB + VB' = V or VB = V/2
In a circuit Y, power supplied to
B  =

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