Maths Practice Question and Answer
8 Q: If the radius of a right circular cylinder is decreased by 50% and its height is increased by 60%, its volume will be decreased by
2224 05f5af50c69ed13038c19b72a
5f5af50c69ed13038c19b72a- 110%false
- 260 %true
- 340 %false
- 420 %false
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Answer : 2. "60 %"
Q: A vessel contains 60 litres of milk. 12 litres of milk taken out from it and replaced with water. Then again form mixture, 12 litres is taken out and replaced with water. The ratio of milk and water in the resultant mixture is :
2224 05ff9b159bfde3c2d396c5e06
5ff9b159bfde3c2d396c5e06- 116 : 9true
- 215 : 10false
- 316 : 10false
- 49 : 5false
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Answer : 1. "16 : 9"
Q: The number 45789 is divisible by which of the single digit number:
2223 05dcd413cc373612390d6957f
5dcd413cc373612390d6957f- 1Only by 3true
- 2Only by 9false
- 3Only by 3 and 7false
- 4Only by 3 and 9false
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Answer : 1. "Only by 3 "
Q: Rita bought a television set with 20% discount on the labeled price. She made a profit of Rs. 800 by selling it for Rs. 16,800. The labeled price of the set was
2222 05f22356cec5b045afeb353b7
5f22356cec5b045afeb353b7- 1Rs.20,800false
- 2Rs.24,000false
- 3Rs.18,000false
- 4Rs.20,000true
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Answer : 4. "Rs.20,000 "
Q: Aarif, Arun and Abraham can do a work in 12, 20 and 24 days, respectively. They all begin together. Aarif leaves the work 1 day, Arun 3 days and Abraham 4 days before its completion. In how many days is the work finished?
2222 064871f2ee8d2170cb3a22a8f
64871f2ee8d2170cb3a22a8f- 111false
- 210false
- 38true
- 49false
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Answer : 3. "8"
Q: If the population of a town is 12.000 and the population increases at the rate of 10% per annum, then find the population. after 3 years.
2222 06426e27c72ca731a990e28e2
6426e27c72ca731a990e28e2- 115,972true
- 212,200false
- 311,200false
- 410,200false
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Answer : 1. "15,972"
Explanation :
To find the population after 3 years given that it increases at a rate of 10% per annum, you can use the formula for exponential growth:
𝑃=𝑃0×(1+𝑟)𝑛P=P0×(1+r)n
Where:
- 𝑃P = Population after 𝑛n years
- 𝑃0P0 = Initial population
- 𝑟r = Rate of increase (in decimal form)
- 𝑛n = Number of years
Given:
- 𝑃0=12,000P0=12,000 (Initial population)
- 𝑟=0.10r=0.10 (10% increase per annum)
- 𝑛=3n=3 (Number of years)
Substitute these values into the formula:
𝑃=12,000×(1+0.10)3P=12,000×(1+0.10)3
𝑃=12,000×(1.10)3P=12,000×(1.10)3
𝑃=12,000×(1.331)P=12,000×(1.331)
𝑃=15,972P=15,972
So, the population after 3 years would be approximately 15,972.
Q: In a trapezium, one diagonal divides the other in the ratio 2 :9. If the length of the larger of the two parallel sides is 45 cm, then what is the length (in cm) of the other parallel side?
2221 05f2bc793cef453383f2220af
5f2bc793cef453383f2220af- 15false
- 210true
- 318false
- 414false
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Answer : 2. "10"
Q: A Train when moves at an average speed of 40 kmph, reaches its destination on time. When its average speed becomes 35 kmph, then it reaches its destination 15 minutes late. Find the length of journey. 2221 05d1ee748f5eae22172e6f3af
5d1ee748f5eae22172e6f3af- 130 kmfalse
- 240 kmfalse
- 370 kmtrue
- 480 kmfalse
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