21. Which of the following is used to control fire of electricity?
A. Pyrine (CCl4)
B. Iodoform
C. Chloroform
D. Formalin
22. Lemon and Sour fruits cantains-
A. Lactic Acid
B. Oxalic Acid
C. Citric Acid
D. Ascorbic Acid
23. The mass number of an atom is equal to-
A. The number of protons
B. The number of protons and electrons
C. The number of electrons
D. The number of neutrons
24. 
A. 6
B. 9
C. 3
D. 12
25. If the difference between 4/5 part and 3/4 part of a number is 4, what is the number?
A. 60
B. 70
C. 80
D. 90
26. A train 135 meters long is running with a speed of 49 km/hr. in what time will it pass a man who is walking at 5 km/hr. in the direction opposite to that of the train?
A. 90 sec
B. 9 sec
C. 54 sec
D. 60 sec
27. Ram Babu Gupta covers his onward journey by his bicycle from Patna to Danapur at 10 km/hr. and during the return journey from Danapur to Patna he covers the same distance at 8 km/hr. If he finishes the onward and return journey in 4 ½ hours, then the total distance covered by him during the entries journey is-
A. 30 km
B. 40 km
C. 50 km
D. 60 km
28. 
A. 100000
B. 39684
C. 69842
D. 30158
29. The cash difference between the selling prices of an article at a profit of 4% and 6% is Rs. 3. The ratio of the two selling prices is-
A. 51:52
B. 52:53
C. 51:53
D. 52:55
30. A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2 hours 30 minutes to cover a distance of 5 km upstream. Find the speed of the river current in km/hr.
A. 1 km/hr
B. 2 km/hr
C. 1.5 km/hr
D. 8 km/hr
31. How many numbers up to 300 are divisible by 5 and 7 together?
A. 8
B. 9
C. 20
D. 25
32. If 
A. 5/7
B. 1 1/7
C. 1
D. 2
33. The largest number by which the product of three consecutive even natural numbers is always divisible, is-
A. 16
B. 24
C. 48
D. 96
34. 12 men can complete a piece of work in 36 days. 18 women can complete the same piece of work in 60 days. 8 men 20 women work together for 20 days. If only women were to complete the remaining piece of work in 4 days, how many women would be required ?
A. 70
B. 28
C. 66
D. 40
35. If the wages of 6 men for 15 days be Rs. 2100, then find the wages of 9 men for 12 days-
A. 2520
B. 2000
C. 2123
D. 2542
36. The HCF of 1.75, 5.6 and 7 is-
A. 0.07
B. 0.7
C. 0.35
D. 3.5
37. A certain amount is distributed among A,B and C. A gets 3/16 and B gets 1/4 of the whole amount. If C gets Rs. 81, then B gets-
A. Rs. 32
B. Rs. 36
C. Rs. 40
D. Rs. 42
38. If a : b = 6 : 9 and b : c = 4 : 7, find a : b : c –
A. 24 : 36 : 63
B. 30 : 36 : 63
C. 10 : 36 : 15
D. 20 : 55 : 35
39. Which word does not belong with the others?
A. Inch
B. Ounce
C. Centimeter
D. Yard
40. Which word does not belong with the others?
A. India
B. Pakistan
C. Bhutan
D. Kathmandu
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