Q65 of 87 Page 107

Which of the following burns without producing a flame?

Coke does not vapourise during burning and hence do not produce flame.

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63

Which of the following fuels has the highest calorific value?

 64

On a cold winter night, the person sleeping in a room with closed door and windows with a coal fire burning inside may die due to the excessive accumulation of:

 66

On a cold winter night, the persons sleeping in a room with closed door and windows with a coal fire burning inside may die to the excessive accumulation of:

 67

Which of the following is the main cause of global warming?