Define the following term (for 1 mark each)
(i) Positive work
(ii) Chemical energy
(iii) Mechanical energy

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Solution

Dear Student,

Positive Work:- Work is said to be positive when direction of force and displacement is same.
Chemical energy ;- It is that part of the energy in a substance that can be released by a chemical reaction.
Mechanical energy :- It is the energy possessed by a body by virtue of its position and motion. It is the combination of potential and kinetic energy.

Regards,

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Match the entries of column I with column II

Device/Machine	Energy Conversion
(a) Hand blender	(i) $E l e c t r i c a l \to H e a t$
(b) Flashlight	(ii) $C h e m i c a l \to H e a t \to M e c h a n i c a l$
(c) Electric kettle	(iii) $E l e c t r i c a l \to M e c h a n i c a l$
(d) Steam engine	(iv) $C h e m i c a l \to E l e c t r i c a l \to L i g h t$

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