Class 12 Chemistry · Chapter 15 · Test 3
Energy Sources and Impact
42 MCQs
42 questions · 35 min · 42 marks
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Sample questions
The first 5 of 42. Try each one, then tap to see the answer.
Question 1
Energy density is the amount of energy stored per unit:
- AVolume
- BMass
- CTime
- DArea
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Answer: A
It is expressed in megajoules per litre (MJ/L).
Question 2
Specific energy is the amount of energy contained per unit:
- AVolume
- BMass
- CTime
- DArea
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Answer: B
It is expressed in megajoules per kilogram (MJ/kg).
Question 3
For aviation and spacecraft applications the more important quantity is:
- AEnergy density
- BColour
- CSpecific energy
- DBoiling point
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Answer: C
Weight is critical so energy per mass matters.
Question 4
Which statement is correct?
- AGasoline has higher energy density than diesel
- BThey are equal
- CDiesel has lower energy density
- DDiesel (35.8 MJ/L) has higher energy density than gasoline (34.2 MJ/L)
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Answer: D
Diesel contains more energy per litre.
Question 5
The specific energy of hydrogen gas is about:
- A120 MJ/kg
- B12 MJ/kg
- C35.8 MJ/kg
- D1.2 MJ/kg
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Answer: A
This makes it potentially useful in aerospace.
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