NCERT Solutions Asked Questions With Answers - ask ncert questions

There are two laws of reflection of light-

(i)        Angle of incidence is always equal to the angle of reflection.

(ii)     The incidence ray, the normal at the point of incidence and the reflected ray all lie in the same plane. 

 The auther found a black tin box in the drawer. It had a slip pasted on it, which said ''jim's last letter, received January 25, 1915. to be buried with me when the time comes.''

Metals are very had, can withstand very high temperature and are strong as well as Iustrous.  That is why they are used in making various. machinery. 

 When crops are irrigated, nutrients get dissolved in water and get transported to each part of the plants along with water. 

 The crop rotation is replenishment of soil with nutrients by avoiding the cultivation of the same crop year after year. It can be done by growing another crop alternately. 

  Connie must have kept Jim's letter for almost 70 to 75 years. The reasons for that are :

-When the author bouhgt the roll-top desk, the junk seller said that the desk was of early 19th century.

-The letter dated 26th Dec. 1914, that is, during the First World War.

-Now Mrs Macpherson was 101 years old.

 For Preparing manure, plant and animal waste is dumped in pits at open places and allowed to decompose. The decomposition is facilitated by some microorganisms. The decomposed matter is called organic manure.

 The sentence-I explained about the desk, about to do I had found it...' shows that the visitor did not try to hide his identity.