
What number should appear next in series 1, 4, 9, 16, 25, ?
A. 28
B. 32
C. 34
D. 36
The correct answer is D (36)  The series consists of squares of consecutive numbers.

5216 x 51 = ?
A. 266016
B. 212016
C. 266436
D. 216314
The correct answer is A (266016)
Normal way of multiplication may take time. Here is an alternative:
5216 x 51 = (5216 x 50) + 5216
= (5216 x 100/2) + 5216
= 521600/2 + 5216
= 260800 + 5216 = 266016. 
A tank is 25 m long, 12 m wide and 6 m deep. What is the cost of plastering of its walls and bottom at the rate of 75 paise per sq. m?
A. Rs. 558
B. Rs. 502
C. Rs. 516
D. Rs. 612
The correct answer is A (558)
Total area to be plastered = Total Surface Area  Area of the Top face
=(2lw + 2lh + 2wh)  lw = lw + 2lh + 2wh
= (25 x 12) + (2 x 25 x 6) + (2 x 12 x 6)
= 300 + 300 + 144
= 744 m2 = Cost of plastering = 744 x 75 = 55800 paise = Rs.558 
Who was the chief guest at the Republic Day celebrations in 2015?
A. Vladimir Putin
B. Angela Merkel
C. David Cameron
D. Barack Obama
The correct answer is D (Barack Obama)  The US president Barack Obama was the chief guest. He was the first US president to be a chief guest at India's Republic Day celebrations.

Synonym of Gracious is
A. Present
B. Pretty
C. Clever
D. Pleasant
The correct answer is D (Pleasant)  Gracious means pleasant, calm and polite