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Thursday, August 15, 2013

Answer key of psc misc preliminary Mathematics part

76. The ratio of two numbers is 4:5 and their LCM is 100. Determine their sum?
Ans- D) 45

77. In an Election for Panchyat, there were two candidates. A total of 9820 votes were polled. 110 vots were invalid. The successful candidate got 6 votes for every 4 votes his opponent had. The margin did the successful candidate win
Ans- C)1942

78. A certain work can be done by A and B in 6 days, by B and C in 12 days. If C alone can do the same work in 36 days then how long will it take to finish the work by working A,B and C together ?
Ans- A) 5 and 1/7 days

79. It has to pay Rs. 225/- as bill when 9 bulbs are used for 30 days using them for 4 hours per day. Find the number of days if 15 bulbs are used for 6 hours per day for the payment of Rs. 375/- against the bill.
Ans- A) 60

80. The compound Interest on a certain sum for 2 years is Rs. 410/- and the simple interest for the same period is Rs. 400/- The rate of interest is
Ans- B) 5%

81. The compound Interest, calculated yearly, on a certain sum of money for the second year is Rs. 800/- and for the third year is Rs. 864/-. the rate of interest will be
Ans- 8%

82. At first the income of a person is reduced by 50%. Then his income is increased by 50%. What is the percentage increase or decrease of his income?

Ans- A) Decrease 25%

83. Applying pulling force a string of rubber is increased by 40% and then force is withdrawn. What percentage of length is decreased to regain its original configuration ?
Ans- D) 28 and 4/7%

84. The difference between the greatest and lowest numbers formed out of the four digits 8,9,0,7 is
Ans- A) 9081

85. A,B and C gain Rs. 35000/- from a joint stock business. If the ratio of the capitals of A and B be 5:2 and that of B and C be 3:2, determine A's share in profit.
Ans- A) RS. 2,100/-

86. An A.C machine is priced at Rs. 15000/- and is sold at a discount of 10%. There is a further off season discount of 5% on the net amount. The customer pay
Ans- C) Rs. 12,825/-

87. A trader has written 20% excess price on a saree but while selling it, gives a 5% discount. Profit is
Ans- C) 14%

88. The simplest value of
(1+ 2/3 ÷ 3/4 of 2/3)
---------------------
(2-3/4 of 2/3 ÷2/3)
Ans- A) 1 and 13/15

89. At what rate of interest will Rs. 360/- amount to Rs. 522/- in 5 years ?
Ans- C) 9%

90. At what rate will the interest on Rs. 900/- in 4 years be equal to the interest on Rs. 720/- in 6 years at 5% per annum
Ans- C) 6%

91. A train 280 meters long is moving at speed of 60 km/hr. The time (second) taken by the train to cross a platform 220 meters long is
Ans- C) 30

92. Some people can do three-seventh of a work in 28 days. To finish the rest of work in 21 days 14 more people were appointed. Determine the number of those people who were appointed initially.
Ans- C) 18

93. What is the greatest pre- square number of 7265?
Ans- C) 7225

94. The greatest number of 33 1/3% of 4, 2% of 5000, 45% of 200.8, 121 3/4 is
Ans- D) 121 3/4

95. A person weights 80 kg. By morning walk, at the beginning of each year, he decreases 5% weight. His weight after 3 years will be
Ans- C) 68.59 Kg

96. In still water the actual speed of a boat is 10 km./hr. and the speed of the river current is 4 km./hr. What time will it take to cover a distance of 30 km. against the current?
Ans- D) 5 hrs.

97. The simplest value of (0.25)² + (0.25)1/2 x (0.5)³
Ans- B) 0.125

98. Due to rotten fish a fish trader forces to sell in 10% loss. If the purchase value is Rs. 250/-, the selling price will be
Ans- C) Rs. 225/-

99. Each of A and B got 8 wickets for 28 runs. Afterwards A got one wicket for 35 runs and B got 4 wickets for 56 runs. Whose average of getting wicket was better?
Ans- C) A and B are same

100. In a box there are 378 coins combining 1 rupee 50 paise and 25 paise coins. The ratio of their values in 13:11:7. Determine the number of 25 paise coins
Ans- C) 168
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© Suman Biswas B.Tech (I.T) And Barnali Biswas M.A,B.Ed