Read the following information carefully and answer the questions which follow.
(i) A is the mother of B.
(ii) C is the sister of A.
(iii) D is the father of C.
(iv) B is the son of E.
Which of the following statements are required to establish that E is male?

Q. Read the following information carefully and answer the questions which follow.
(i) A is the mother of B.
(ii) C is the sister of A.
(iii) D is the father of C.
(iv) B is the son of E.
How is D related to E?

Q. There is a question below followed by two statements. Read the question carefully and choose which of the statements I and II is/are necessary to answer the question ?
Who is the father of D if A and B are the sons of D ?
I. C is the brother of A and the son of E.

Q. Question 3
Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light.

(a) i, ii and iv only
(b) i and ii only
(c) i, ii and iii only
(d) ii, iii and iv only

Q. Directions:- Study the following information carefully to answer the question given below.

(i) In a family of 6 persons, there are two couples.
(ii) The Lawyer is the head of the family and has only two sons - Mukesh and Rakesh - both Teachers.
(iii) Mrs. Reena and her mother-in-law both are Lawyers.
(iv) Mukesh's wife is a Doctor and they have a son, Ajay.

What is the profession of Rakesh's wife?

Q. A linear harmonic oscillator of force constant $2\times {10}^{6}N{m}^{-1}$ and amplitude 0.01 m has a total mechanical energy 160 J. which of the following statements are correct?
(i) Maximum PE is 100 J (ii) Maximum KE is 100 J
(iii) Maximum PE is 160 J (iv) Minimum PE is zero