Question

REVISION TEST- CLASS 8 -SCIENCE
1)Name two products that you obtain from the destructive distillation of
coal, What is the residue left in this process? Give one main use of this
residue. (2 marks)
2)Deline fossil fuels, Give cramples, (2 marks)
3) Calorific value of a fuel is 80.000 kJ/kg Find the amount of fuel
required to produce 4,80,000 J of heat energy, (2 marks)
Deline pressure
A force of 50 N is applied on an area of 3 m'. Compute pressure being
applied on the area. (3 marks)
Friction is called as a necessary evil. Explain why? (3 marks)​

Answer 1

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