Maths Practice Question and Answer
8 Q: If cos2α + cos2β = 2, then the value of tan3 α + sin5 β is :
3081 05df1f6610183ea49d62ce47e
5df1f6610183ea49d62ce47e- 1– 1false
- 20true
- 31false
- 4$$ {1\over √3 } $$false
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Answer : 2. "0"
Q: Three pipes A, B and C can fill a cistern in 10 hours, 12 hours and 15 hours respectively. First A was opened. After 2 hour, B was opened and after 4 hours from the start of A, C was also opened. Find the time in which the cistern is just full.
3080 05eaba5b21cb95f071aa27a60
5eaba5b21cb95f071aa27a60- 12 hoursfalse
- 24 hoursfalse
- 32 hours 52 minfalse
- 45 hours 44 min.true
- 5None of thesefalse
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Answer : 4. "5 hours 44 min."
Q: A, B and C can complete a work in 10, 15 and 20 days respectively. A and B start it together. B is replaced by C after 2 days. A leave it after one more day. In how many days work was completed? 3079 05d1485969aeb0a08f1e67225
5d1485969aeb0a08f1e67225- 113false
- 2\(13 {1 \over 13 }\)true
- 3\(18 {4 \over 3 }\)false
- 418false
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Answer : 2. " \(13 {1 \over 13 }\)"
Q: The MRP of a watch is Rs.4750. The shop sells it at 12% discount. If the shopkeeper had purchased the watch for Rs. 3,850, what is his gain?
3079 05eba1f728e4fa473bcb7d461
5eba1f728e4fa473bcb7d461- 1Rs.240false
- 2Rs.570false
- 3Rs.900false
- 4Rs.330true
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Answer : 4. "Rs.330 "
Q: Two places P and Q are 92 km apart. A train leaves P for Q and at the same time another train leaves Q for P. Both the trains meet 4 hrs after they start moving. If the train travelling from P to Q travels 7 km/hr faster than the other train, find the speed of the two trains.
3075 05fd1e2972cbd2c3f9a435ac7
5fd1e2972cbd2c3f9a435ac7- 115 km/hr, 8 km/hrtrue
- 212 km/hr, 8 km/hrfalse
- 312 km/hr, 9 km/hrfalse
- 415 km/hr, 9 km/hrfalse
- 5None of thesefalse
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Answer : 1. "15 km/hr, 8 km/hr"
Q: 26 men can complete a piece of work in 17 days. How many more men must be hired to complete the work in 13 days? 3069 15d14995a489f2f135e08df26
5d14995a489f2f135e08df26- 19false
- 28true
- 36false
- 418false
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Answer : 2. "8"
Q: The coordinates of the incentre of the triangle whose sides are 3x – 4y = 0, 5x + 12y = 0 and y – 15 = 0, are
3068 05ef051f1f18fb82abc774ca0
5ef051f1f18fb82abc774ca0- 1(–1, 8)true
- 2(1,8)false
- 3(2, 8)false
- 4(2, –8)false
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Answer : 1. "(–1, 8)"
Q: A tank contains a mixture of 80 litre of milk and water. 70% of the milk and 30% of the water are drawn, therefore 55% part of the tank become empty. Find the initial quantity of milk and water in the tank.
3065 05f589bef93cd323636091386
5f589bef93cd323636091386- 150 litre , 30 litretrue
- 230 litre, 50 litrefalse
- 320 litre, 60 litrefalse
- 4None of thesefalse
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