11: In the given figure, all line segments of the shaded portion are of the same length and at right angles to each other. The same can be cut out of a board of side 10 cm. What is the area of the shaded portion ?
(a) 36 cm2
(b) 48 cm2
(c) 52 cm2
(d) 64 cm2
12: In the year 2001, in which one of the following events of Women's Singles did Venus Williams defeat Serena Williams to win the title?
(a) Australian Open 2001
(b) French Open 2001
(c) Wimbledon 2001
(d) US Open 2001
13: Railway and Telegraphy systems were introduced in India by:
(a) Lord Dalhousie
(b) Lord Cornwallis
(c) Lord Bentinck
(d) Lord Wellesley
14: Consider the following:
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes/cause acid rain ?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
15: The drugs "caffeine, tannin and nicotine" are:
(a) Steroids
(b) Cortisones
(c) Alkaloids
(d) Mild alkalis