AP Polycet (Polytechnic) 2021 Previous Question Paper with Answers And Model Papers With Complete Analysis

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Polycet Mock Test


AP POLYCET
Section — B
PHYSICS

51) The materials which have resistivity in the order of 1014 to 1016 Ω-m are

A) insulators
B) conductors
C) semiconductors
D) None of these

View Answer
A) insulators

Explanation:Materials with resistivity in the order of 10^{14} to 10^{16}\ \Omega-m are very poor conductors of electricity.
Shortcut Concept:
Conductors: Resistivity \~ 10^{-8}\ \Omega-m (e.g., copper, silver)
Semiconductors: Resistivity \~ 10^{-5} to 10^6\ \Omega-m
Insulators: Resistivity \~ 10^{11} to 10^{16}\ \Omega-m
Final Answer: Insulators

52) The graph between potential difference (on X-axis) and current (on Y-axis) for a conductor gives a straight line

A) parallel to X-axis
B) parallel to Y-axis
C) passing through origin
D) intercepting both X-axis and Y-axis

View Answer
C) passing through origin

53) 1 joule/1 coulomb =

A) 1 volt
B) 1 ohm
C) 1 watt
D) 1 ampere

View Answer
A) 1 volt

54) Pick the false statement from the following

A) Resistivity is also called specific resistance
B) Reciprocal of resistivity is called conductivity
C) Units of both resistivity and resistance are the same
D) Low resistivity metals are good conductors

View Answer
C) Units of both resistivity and resistance are the same

55) A current of 1.5 A passes through a conductor of resistance 20Ω. The potential difference across it is

A) 13.33 V
B) 30 V
C) 5V
D) 20 V

View Answer
B) 30 V

Explanation:We use Ohm’s Law:
V = I × R
Given:
I = 1.5\ \text{A}
R = 20\ \Omega
V = 1.5 × 20 = \boxed{30\ \text{V}}
Final Answer: 30 V

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