MCQ on Electric Power

MCQ on Electric Power

MCQ on Electric Power. Practice Electric Power Multiple Choice Questions and Explanation.

Practice MCQ Questions with Answers for Electric Power students will gain deep knowledge in Electric Power Quiz Questions. You can practice all MCQ Questions for Class 10 Physics with Answers for CBSE Board Exam.

Electric Power MCQs

Hello students in section we are going to deal with illustrative examples on electric power. So let’s start the discussion by solving the following multiple choice questions.

Q.1) Electric power is represented by formula……

Q.2) Which if the following is not unit of electric power?

a) volt-ampere

b) joule/sec

c) watt

d) joule-ampere

Ans: d)

Explanation: d) joule ampere is not a unit of power.

Q.3) The energy consumed by electric appliance of power 1 kW 1 hr is…..

a) 360 J

b) 36×103 J

c) 3.6× 106 J

d) 36×106 J

Ans: c)

Explanation: c) 1 kW.h = 1000×3600 = 3.6× 106  J

Q.4) Electric geyser is used for 2 hours has power of 1200 watt, energy spent by geyser is… ….

a) 2.0 unit

b) 2.4 unit

c) 2.8 unit

d) 3.2 unit

Ans: b)

Explanation: b) electric energy spent = power× time= 1.2×2 =2.4 unit

Q.5) A Windmill has to generate……..power so the potential difference maintained by it can be 220 V and should able to produce current of 2 A per unit time.

a) 0.44 kW

b) 0.40 kW

c) 0.36 kW

d) 0.32 kW

Ans: b)

Explanation: b)electric power,P = VI= 220×2 =440 watt=0.44 kW

Q.6) The cost of electric energy for the month of February if TV set of power 650 watt works for 3 hours daily. The cost per unit is Rs.7.50/-

a) 409.5 Rs.

b) 309.5 Rs.

c) 209.5 Rs.

d) 209.5 Rs.

Ans: a)

Explanation: a) Here total time of usage is= 3×28

electric energy,E = Pt=0.65×3×28 = 54.6 units

Cost of electric energy = 54.6×7.5= 409.5 Rs.

Q.7) An electric motor is of 1.5 hp connected for supply of 220 V, then current drawn by electric motor is…

a) 2 A b) 3 A c) 4 A                     d) 5 A

Ans: d)

Explanation: d) P=1.5 hp= 1.5×746=1119 W

electric power, P = VI

Q.8) Three resistors of values 100 Ω, 200 Ω and 300 Ω are connected in parallel across cell which provides the power of 500 watt, amount of current through the circuit is….

a) 1.5 A

b) 2.0 A

c) 2.5 A

d) 3.0 A

Ans: d)

Explanation: d) here equivalent resistance is

Q.9) Three resistors of 25 Ω are connected in circuit with p.d. 12 V, the total power of circuit will be 

a) 1.8 A

b) 1.9 A

c) 2.0 A

d) 2.1 A

Q.10) If appliances of power 500 watt, 650 watt and 850 watt are connected in parallel, the total power consumed by them is….

a) 1 kW

b) 1.5 kW

c) 2.0 kW

d) 0

Ans: c)

Explanation: c) Total power in parallel combination =P1 + P2 +P3 = 2000 watt

Q.11) Potential difference of 220 volt connected across resistor of resistance ‘R’. The power consumed in the circuit is 1 kW, then R=?

a) 48 Ω

b) 50 Ω

c) 52 Ω

d) 54 Ω

Ans: a)

Q.12) An electric iron of 600 watt works on 220 volt supply, current dwarn by iron is

a) 2.3 A

b) 2.5 A

c) 2.7 A

d) 2.9 A

Ans: a)

Explanations: a) electric power,P = VI

∴ I = 600/220 = 2.72 A ≈ 2.7 A

Q.13) Solar panel fixed on the roof of school building is able to produce energy of 1.8 kW.h per day; the power generated by solar panel in the month of April is…

a) 18 kW

b) 36 kW

c) 54 kW

d) 72 kW

Ans: c)

Explanations: c) here in 1 hr power generated is P= 1.8 kW,

Power generated in 30 days =1.8×30=54 kW

Q.14) A wire of resistance 2 kΩ connected across battery of pd 220 V, power consumed and current in circuit will be……..

a) 24.2 W,10 mA

b) 24.2 W,12 mA

c) 48.4 W,10 mA

d) 48.4 W,12 mA

Ans: b)

Q.15) For maximum power consumption, resistors of resistance R should be connected in………

a) series

b) parallel

c)  both a or b

d)none of these

Ans: b)

Explanations: b) According to the formula P= V2/R, the power is inversely proportional to resistance, and we know that resistors in parallel has less resistance as compared to connected in series,

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