Q1. A diesel engine converts energy from _______. Choose the most appropriate option from below.
A Chemical energy to mechanical energy Correct
B Chemical energy to electrical energy
C Electrical energy to sound energy
D Nuclear energy to electrical energy
Explanation
A diesel engine burns diesel fuel inside the cylinder. The fuel contains chemical energy, and combustion converts that stored energy into heat and pressure, which push the piston and finally produce mechanical work at the crankshaft. Chemical energy to electrical energy describes a cell or generator-linked system, not the engine’s direct conversion. Electrical energy to sound energy fits devices such as speakers. Nuclear energy to electrical energy belongs to nuclear power generation, where reactor heat drives turbines and generators.