A transformer has 100 turns in the primary coil and 500 turns in the secondary coil. If the primary voltage is 220V, what is the secondary voltage assuming 100% efficiency?

The correct answer is C: 1100 V. Using transformer equation: Vₛ/Vₚ = Nₛ/Nₚ. Vₛ = 220 × (500/100) = 220 × 5 = 1100 V.

A current-carrying conductor is placed in a magnetic field perpendicular to it. What force acts on it?

The correct answer is B: Lorentz force. The force on a current-carrying conductor in a magnetic field is called the Lorentz force, given by F = BIL

Which plant hormone promotes fruit ripening and is commercially used in India for tomato and mango maturation?

The correct answer is B: Ethylene. Ethylene (C₂H₄) is the ripening hormone that triggers color change, softening, and aroma development in climacteric fruits.

When light passes from a denser to a rarer medium at an angle greater than the critical angle, what happens?

The correct answer is B: Light undergoes total internal reflection. At critical angle θ_c, refracted ray becomes parallel to the interface. Beyond this angle, no refraction occurs; light completely reflects back into the denser medium (total internal reflection). This principle enables fiber optics.

Which of the following statements about the Oort Cloud is incorrect?

The correct answer is D: It has been directly observed through telescopes and contains approximately 1 trillion objects. The Oort Cloud remains theoretical and has never been directly observed; we infer its existence from comet trajectories and orbital studies. While estimates suggest it contains billions to trillions of icy bodies, these objects are too distant and too small to be directly observed with current techn