TS POLYCET 2025 Question Paper with Solutions Free (Set-wise Answer Key)

71)Which of the following is constant throughout a uniform magnetic field?

A) Magnetic field strength

B) Magnetic flux

C) Magnetic force

D) Electric field strength

View Answer

A) Magnetic field strength
Explanation:In a uniform magnetic field, magnetic field strength remains constant
72)The force on a current-carrying conductor placed in a magnetic field becomes zero, when it is:

A) Perpendicular to the magnetic field

B) Parallel to the magnetic field

C) At an angle of 45° to the magnetic field

D) In the direction of magnetic flux

View Answer

B) Parallel to the magnetic field
Explanation:Force = BIL sinθ ⇒ zero when θ = 0° ⇒ parallel
73)Electric motor converts:

A) Electrical energy to mechanical energy

B) Mechanical energy to electrical energy

C) Electrical energy to heat energy

D) Electrical energy to light energy

View Answer

A) Electrical energy to mechanical energy
Explanation:Electric motor converts electrical energy into mechanical energy
74)The lens used to correct myopia is:

A) Convex lens

B) Biconcave lens

C) Bifocal lens

D) Cylindrical lens

View Answer

B) Biconcave lens
Explanation:Myopia (short-sightedness) is corrected using concave (biconcave) lens
75)Which law indicates this relation?

A) Gauss's Law

B) Ampère's Law

C) Faraday's Law of Induction

D) Coulomb's Law

View Answer

C) Faraday's Law of Induction
Explanation:ε = Δϕ/Δt represents Faraday's law of electromagnetic induction
76)Lenz's law explains about:

A) Direction of induced current

B) Magnetic fields of current

C) Conservation of energy

D) Change in magnetic flux

View Answer

A) Direction of induced current
Explanation:Lenz's law gives direction of induced current
77)The formula for power of a lens is:

A) \( P = \frac{1}{f} \)

B) \( P = f \)

C) \( P = \frac{1}{R} \)

D) \( P = \frac{100}{f_{cm}} \)

View Answer

D) \( P = \frac{100}{f_{cm}} \)
Explanation:Power of lens:
P = \( \frac{100}{f(cm)} \)
78)Which of the following obeys Ohm's law?

A) Copper wire

B) Filament of bulb

C) Diode

D) Carbon resistor

View Answer

A) Copper wire
Explanation:Copper wire obeys Ohm's law (linear V-I relation)
79)How many times does a ray of light refract when it passes through a prism?

A) 1

B) 2

C) 3

D) 4

View Answer

B) 2
Explanation:Light refracts twice in a prism (entry and exit)
80)Which of the following is used in household circuits to prevent damages due to overloading?

A) Fuse

B) Switch

C) Battery

D) Capacitor

View Answer

A) Fuse
Explanation:Fuse protects circuits from overloading by breaking the circuit
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