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

AP Polycet Mock Test

71)The power of a lens is 2.5D. Its focal length is

A) 10cm

B) 25cm

C) 30cm

D) 40cm

View Answer

D) 40cm
Explanation:The power of a lens $P = \frac{100}{f(\text{cm})}$

.
Given $P = 2.5 \, D$

, so
$f = \frac{100}{2.5} = 40\, \text{cm}$

72)Bifocal lenses used to correct the defect of vision are called

A) hypermetropia

B) presbyopia

C) myopia

D) None of these

View Answer

B) presbyopia
Explanation:Bifocal lenses are used to correct presbyopia (age-related near and far vision problems).
Answer:presbyopia

73)Pick the correct answer from the following two statements :

A) only A is true

B) only B is true

C) Both A and B are true

D) Both A and B are false

View Answer

A) only A is true
Explanation:(A) True: Wavelength increases from violet to red in VIBGYOR.
(B) False: Refractive index decreases from violet to red (violet bends more).
Answer:only A is true

74)The formation of the rainbow is due to the dispersion of sunlight by the

A) dust particles

B) water droplets

C) N₂ molecules

D) inert gas molecules

View Answer

B) water droplets
Explanation:Rainbows form due to dispersion of sunlight by water droplets.
Answer:water droplets

75)If i₁ and i₂ are the angles of incidence and emergence respectively and A is the angle of prism, then the angle of deviation is given by

A) (i₁+i₂)=2A

B) (i₁+i2₂)= A

C) A(i₁-i₂)

D) A(i₁+i₂)

View Answer

B) (i₁+i2₂)= A

76)The quantity which has the unit ampere-second is

A) electric current

B) electric potential

C) electric charge

D) electromotive force

View Answer

C) electric charge
Explanation:Ampere-second is the unit of electric charge (Q = I × t).
Answer:electric charge

77)A bulb is marked 100W and 240V. The resistance of the bulb is

A) 41.66Ω

B) 250Ω

C) 24Ω

D) 576Ω

View Answer

D) 576Ω
Explanation:Power $P = \frac{V^2}{R} ⇒ R = \frac{V^2}{P} = \frac{240^2}{100} = \frac{57600}{100} = 576 \, Ω$

Answer:576Ω

78)Electric fuse is used in household circuits for the purpose of

A) measuring electric current

B) maintaining all appliances in series

C) preventing damages due to overloading

D) decreasing resistances of the bulbs

View Answer

C) preventing damages due to overloading
Explanation:Fuses protect circuits from overloading or excess current.
Answer:preventing damages due to overloading

79)Four resistors of 2Ω are connected in the form of four sides of a parallelogram. The equivalent resistance between any two opposite corners is

A) 1Ω

B) 2Ω

C) 4Ω

D) 8Ω

View Answer

B) 2Ω

80)Ohm’s law is applicable to

A) gaseous conductors

B) semiconductors

C) metallic conductors

D) light emitting diodes

View Answer

C) metallic conductors
Explanation:Ohm’s law applies best to metallic conductors (linear V–I relationship).
Answer:metallic conductors

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