Given below are a few situations. Study them and state in which of the given cases work is said to be done. Give reasons for your answer. A person pushing hard a huge rock but the rock does not move.

In only one of the circuits given below, the lamp L lights. Which circuit is it? Given reason for your answer.

State if each of the following statements is true or false. Give reasons for your answer:- Work done in the motion of a body over a closed loop is zero for every force in nature.

How will you induce lateral branching in a plant which normally does not produce them?Give reason in support of your answer.

Study the population growth curves in the given below and answer the questions which follow: Which one of them is considered a more realistic one and why?

Statement-1 (Assertion and Statement- 2 (Reason) Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select the correct choice as given below. Statement-1 For a singular matrix A , if AB = AC rArr B = C Statement-2 If abs(A) = 0, thhen A^(-1) does not exist. a. Statement- is true, Statement -2 is true, Statement-2 is a correct explanation for Statement-1 b. Statement-1 is true, Statement-2 is true, Sttatement - 2 is not a correct explanation for Stamtement-1 c. Statement 1 is true, Statement - 2 is false d. Statement-1 is false, Statement-2 is true

Does the transfer of energy takes place when you push a huge rock with all your might and fail to move it ? Where is the energy you spent going ?