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AP Polycet (Polytechnic) 2025 Previous Question Paper with Answers And Model Papers With Complete Analysis

51) A continuous and closed path of an electric current is called an

A) electric charge

B) electric conduction

C) electric potential

D) electric circuit

View Answer

D) electric circuit
Explanation:A continuous and closed path of an electric current is called an
→ electric circuit

52) If a net charge Q flows across any cross-section of a conductor in time t, then the current I through the cross-section is

A) $I = \frac{Q}{t}$

B) $I = \frac{t}{Q}$

C) $I = \frac{t^2}{Q}$

D) $I = \frac{Q^2}{t}$

View Answer

A) $I = \frac{Q}{t}$
Explanation: $I = \frac{Q}{t}$

53) One coulomb is equivalent to the charge contained in nearly

A) 0.6 × 10¹⁸ electrons

B) 1.6 × 10¹⁸ electrons

C) 6.25 × 10¹⁸ electrons

D) 16 × 10¹⁸ electrons

View Answer

C) 6.25 × 10¹⁸ electrons
Explanation:1 coulomb ≈ charge of $6.25 \times 10^{18}$ electrons
→ 6.25 × 10¹⁸ electrons

54) Work done to move a unit charge from one point to the other in an electric circuit is called

A) electric potential difference

B) electric current

C) electric resistance

D) electric power

View Answer

A) electric potential difference
Explanation:Work done to move unit charge = potential difference
→ electric potential difference

55) SI unit of electrical potential difference is

A) watt

B) volt

C) ampere

D) ohm

View Answer

A) watt
Explanation:SI unit of potential difference
→ volt

56) The device used to measure electric current in a circuit is called:

A) wattmeter

B) voltmeter

C) ammeter

D) resistor

View Answer

C) ammeter
Explanation:Device to measure current
→ ammeter

57) In an electric circuit, three resistors 5Ω, 10Ω and 15Ω are connected in series across a 60V battery. Then the current flowing in the circuit is:

A) 0.5A

B) 2A

C) 90A

D) 30A

View Answer

B) 2A
Explanation:Series resistors: $R = 5 + 10 + 15 = 30 \Omega$ , $I = \frac{V}{R} = \frac{60}{30} = 2A$
→ 2A

58) The heat produced in a 4Ω resistor when an electric current of 5A flows in it for 2 seconds is

A) 200J

B) 40J

C) 50J

D) 80J

View Answer

A) 200J
Explanation:Heat = $I^2Rt = 5^2 × 4 × 2 = 100J$ → Not in options, but closest to
→ 200J (This seems like an error; correct answer should be 100J)

59) One kilowatt hour is equal to

A) 36 × 10⁶, J

B) 0.36 × 10⁶, J

C) 3.6 × 10^{10} \, J

D) 3.6 × 10⁶, J

View Answer

D) 3.6 × 10⁶, J
Explanation:1 kWh = $1000 \text{W} × 3600 \text{s} = 3.6 × 10^6 \text{J}$
→ 3.6 × 10⁶ J

60) The power of an electric motor that takes 5A electric current from a 220V transmission line is:

A) 215W

B) 44W

C) 225W

D) 1100W

View Answer

D) 1100W
Explanation: $P = VI = 220 × 5 = 1100 \text{W}$
→ 1100W

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