Maths Practice Question and Answer
8 Q: A fraction becomes $${1\over 6}$$ when 4 is subtracted from its numerator and 1 is added to its denominator. If 2 and 1 are respectively added to its numerator and the denominator, it becomes $${1\over 3}$$. Then, the LCM of the numerator and denominator of the fraction, must be
1703 05f081b318e448621429e805b
5f081b318e448621429e805b- 15false
- 270true
- 314false
- 4350false
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Answer : 2. "70"
Q: If the radius and height of a cylinder increase by 20% and15% respectively. Then what is the % change in curved surface area?
1703 05e9da3010a165a45b759dfd1
5e9da3010a165a45b759dfd1- 138%true
- 242%false
- 335%false
- 432%false
- 5Cannot be determinedfalse
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Answer : 1. "38% "
Q: Father’s age after five years will be three times of his son’s age, while this father’s age before five years was seven times of his son’s age. Find father’s age at present. 1703 05d0caf440cbb1019f524825c
5d0caf440cbb1019f524825c- 135false
- 240true
- 350false
- 445false
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Answer : 2. "40"
Q: A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in $$1\over4$$ of a day?
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5d7f2456fb24f902086390b8- 11false
- 24false
- 319false
- 441true
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Answer : 4. "41"
Q: If x tan45° cos30° = sin30° cos45°, then x is equal to -
1702 05ebb7011c1aae5429b38e67a
5ebb7011c1aae5429b38e67a- 1$${1\over\sqrt { 3} \ } $$false
- 2$${1\over\sqrt { 6} \ } $$true
- 3$${1\over\sqrt { 2} \ } $$false
- 4$${2\over\sqrt { 3} \ } $$false
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Answer : 2. "$${1\over\sqrt { 6} \ } $$"
Q: A Navy captain going away from a lighthouse at the speed of 4[(73) -1] m/s. He observes that it takes him 1 minute to change the angle of elevation of the top of the lighthouse from 60 ° to 45 °. What is the height (in meters) of the lighthouse?
1702 05f0c24b16d43556009430587
5f0c24b16d43556009430587- 1360√3false
- 2280√2false
- 3240√3true
- 4480[(√3)-1]false
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Answer : 3. "240√3 "
Q: The average of marks obtained by 120 candidates in an examination is 35. The average of marks obtained by passed candidates is 39 and that of for failed candidates is 15. What is the no. of passed candidates? 1702 05d19d8bd1388cd24f0860f10
5d19d8bd1388cd24f0860f10- 1100true
- 2120false
- 3150false
- 4140false
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Answer : 1. "100"
Explanation :
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Q: ABCD is a trapezium in which AB‖CD. M and N are the mid points of AD and BC respectively. If AB=14 cm and MN=15 cm, find CD.
1701 05f59cd0e57517e34e3444b6f
5f59cd0e57517e34e3444b6f- 116 cmtrue
- 218 cmfalse
- 38 cmfalse
- 410 cmfalse
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