Q31. Which engine works on diesel?
Correct: Diesel engine
Diesel engines use diesel fuel.
Q32. What is the boiling point of water?
Correct: 100°C
Water boils at 100°C.
Q33. Which tool measures pressure?
Correct: Barometer
Barometer measures pressure.
Q34. Which material is strongest in tension?
Correct: Steel
Steel is strong in tension.
Q35. What is the unit of electric charge?
Correct: Coulomb
Charge is measured in Coulomb.
Q36. Which device steps up or steps down voltage?
Correct: Transformer
Transformer changes voltage level.
Q37. What is the unit of work?
Correct: Joule
Work is measured in Joule.
Q38. Which metal is used in aircraft bodies?
Correct: Aluminum
Aluminum is light and strong.
Q39. What is the efficiency of an ideal machine?
Correct: 100%
Ideal machine has 100% efficiency.
Q40. Which gear arrangement increases speed?
Correct: Large to small
Large driving small increases speed.
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