21. A man bought a second hand scooter for Rs. 1200 and spent Rs. 200 on its repairs. He sold it for Rs. 1680. His gain percent is:
(a) 20%
(b) 10%
(c) 8%
(d) 16%

22. Which element has the atomic number 31?
(a) Boron
(b) Aluminum
(c) Gallium
(d) Indium

23. If the ratio of the cost price and selling price of an article is 5:6, the gain percent is
(a) 25%
(b) 30%
(c) 20%
(d) 33%

24. The diameter of a wheel is 1.26 m. How far will it travel in 500 revolutions?
(a) 1890 m
(b) 1900 m
(c) 1980 m
(d) 2000 m

25. Which one of the following organs breaks fat to produce cholesterol?
(a) Intestine
(b) Liver
(c) Lungs
(d) Kidneys

26. If 3x-3x-1-18 then find the value of xx?
(a) 27
(b) 29
(c) 30
(d) 32

27.How many bricks, each of dimensions 25 cm x 16 cm x 10 cm will be needed to build a wall 24 m long, 6m high and 0.4 m thick
(a) 14440
(b) 14000
(c) 15440
(d) 15000

28. The average of a set of numbers reduces from 14 to 11 when the number 35 is removed. How many numbers were in the original set?
(a) 8
(b) 11
(c) 21
(d) 25

29. Ten cats caught 10 rats in 10 seconds. How many cats are required to catch 100 rats in 100 seconds?
(a) 100
(b) 10
(c) 20
(d) 50

30.  Hepatitis-B, which affects liver, is actually a
(a) Virus
(b) Bacterium
(c) Protozoan
(d) Helminth