Answer: C) Veins have valves; arteries do not. Explanation: Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.   Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.

Answer: B) 12 Explanation: Using BODMAS law, 3 x 3 + 3 - 3 + 3 = 3 x 3 = 12 = 12 + 3 - 3 + 3 =  9 + 3 = 12   Hence, 3 x 3 + 3 - 3 + 3 = 12.

Answer: D) Bacteria Explanation: The process by which bacteria convert nitrogen gas (N2) into ammonia (NH3) is called Nitrogen Fixation.   The conversion of nitrogen from one form to another in the nitrogen cycle is carried out primarily by Nitrogen Fixing Bacteria such as Azotobacter.

Answer: D) M.Visweswariah Explanation: M.Visweswariah is known as the Father of Indian Engineering.   Father of Indian Printing - James Hickey Father of Indian Green Revolution - Dr. M.S. Swaminathan Father of Indian Painting - Nandalal Bose.

Answer: B) Rs. 432 Explanation: Here Avinash gave to Rajeev and Rajeev gave the same to Chanukya Principal amount and Time is same but the only difference is Rate of interest. Rajeev took @ 8% and gave it to Chanukya @ 6% Here the difference in interest rate = 2% 2% of 5400 should be the extra amount paid by Rajeev to Avinash Required amount = 2 x 5400 x 4100 = 432   Hence, Rs. 432 is the extra amount has to be paid by Rajeev to Avinash after 4 years.

SHORT is the required five letter word, which becomes SHORTER when two letters 'ER' are added to it.

Answer: A) Father & Son Explanation: Given that man's father is my father's son => Me because i have no brothers => Mans father is me. Hence, that man is my Son.

Answer: D) 280 Explanation: Here asked for the value of 28 tens => 28 x 10 = 280.