946: What type of mirror is used by motorists to see the road behind them?
(a) Convex
(b) Concave
(c) Plane
(d) Concavo-convex
947: Carpenter A can make a chair in 6 hours, carpenter B in 7 hours and carpenter C in 8 hours. If each carpenter works for 8 hours per day, how many chairs will be made in 21 days ?
(a) 61
(b) 73
(c) 67
(d) 79
948: Swaraj as a national demand was first made by:
(a) Bal Gangadhar Tilak
(b) Dadabhai Naoroji
(c) Jawaharlal Nehru
(d) Chitaranjan Das
949: Consider the following statements:
1. Anhydrous sodium carbonate is commonly known as baking soda.
2. Baking soda is used in fire extinguishers.
3. Bleaching power is manufactured in Hasenclever plant.
Which of the following statements given above is/are correct?
(a) 1 and 2
(b) 2 and 3
(c) 3 only
(d) 1, 2 and 3
950: Genetically modified "golden rice" has been engineered to meet human nutritional requirements. Which one of the following statements best qualifies golden rice ?
(a) Its modified genes cause the fortification of its grains with vitamin D grains have been fortified with genes to provide three times higher grain yield per
(b) Its modified genes cause the synthesis of all the nine essential amino acids
(c) The grains have been fortified with genes to provide three times higher grain yield per acre than other high yielding varieties
(d) Its grains contain pro-vitamin A which upon ingestion is converted to vitamin A in the human body