AP Polycet (Polytechnic) 2022 Previous Question Paper with Answers And Model Papers With Complete Analysis

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Polycet Mock Test

81) Resistance of a wire of length 0.5m and area of cross-section 1mm2 is 1Ω. The resistivity (in Ω-m) of the wire is

A) 2×10-3
B) 10-3
C) 2×10-6
D) 10-6

View Answer
C) 2×10-6

Explanation:Resistivity \rho = R \cdot \frac{A}{L}
Given: R = 1\,Ω, A = 1\,\text{mm}^2 = 1 × 10^{-6} \,\text{m}^2, L = 0.5\,\text{m}
\rho = 1 \cdot \frac{1 × 10^{-6}}{0.5} = 2 × 10^{-6} \,Ω\text{-m}
Answer:2×10⁻⁶

82) The area of current- time graph gives

A) potential difference
B) specific resistance
C) electric power
D) electric charge

View Answer
D) electric charge

Explanation:Area under current–time graph = \int I\,dt = Q (charge)
Answer:electric charge

83) Two resistors of 32 and 22 are connected in series and a potential difference of 5V is applied across then. The potential difference across 22 resistor is

A) 2 V
B) 1 V
C) 5 V
D) 30 V

View Answer
A) 2 V

Explanation:Total resistance R = 32 + 22 = 54\,Ω
Current I = \frac{V}{R} = \frac{5}{54} \,A
Voltage across 22Ω resistor: V = IR = \frac{5}{54} × 22 = \frac{110}{54} ≈ 2.04\,V
Closest option:Answer:2V

84) Of the two bulbs in a house, one glows brighter than the other, which of the two has larger resistance?

A) Brighter bulb
B) Dim bulb
C) Both have same resistance
D) Brightness does not depends on resistance

View Answer
B) Dim bulb

Explanation:Brighter bulb consumes more power ⇒ for same voltage, P = \frac{V^2}{R} ⇒ smaller resistance.
So, dim bulb has larger resistance.
Answer:Dim bulb

85) Pick the correct answer from the following two statements:
(A) Kirchhoff’s junction law is based on the conservation of charge.
(B) Kirchhoff’s loop law is based on the conversation of energy.

A) Only A is true
B) Only B is true
C) Both A and B are true
D) Both B and A are false

View Answer
C) Both A and B are true

(A) Kirchhoff’s junction law → conservation of charge
(B) Kirchhoff’s loop law → conservation of energy
Answer:Both A and B are true

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