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

57) 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

58) 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

59) 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)

60) 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

61) 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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