Maths Practice Question and Answer
8 Q: In solving a problem, one student makes a mistake in the coefficient of the first degree term and obtains – 9 and – 1 for the roots. Another student makes a mistake in the constant term of the equation and obtains 8 and 2 for the roots. The correct equation was
2847 05e327c5bd0aa6f23a8fc6e21
5e327c5bd0aa6f23a8fc6e21- 1x2 + 10x + 9 = 0false
- 2x2 – 10x = 16 = 0false
- 3x2 – 10x + 9 = 0true
- 4None of thesefalse
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Answer : 3. "x2 – 10x + 9 = 0"
Q: 111.01 +41.23+(4.96)2 +(2.09)2=?
2844 06040aa3e5440db5ee7a491d9
6040aa3e5440db5ee7a491d9- 1195false
- 2162false
- 3181true
- 4170false
- 5189false
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Answer : 3. "181"
Q: A 200 m long train passes a motorcycler, running in the same direction at 12 km/hr, in 15 second and a jeep travelling in the same direction in 20 s. At what speed is the car travelling (length of both the motorcycler and jeep is negligible)? 2842 05b5cc607e4d2b4197774b502
5b5cc607e4d2b4197774b502- 136 kmphfalse
- 232 kmphfalse
- 329 kmphfalse
- 424 kmphtrue
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Answer : 4. "24 kmph"
Explanation :
Answer: D) 24 kmph Explanation: Let the speed of the train be 'S' kmph From the given data, Distance = Length of train = D = 200 mts = 200 x 18/5 kms Time = 10 sec given speed of the motorcycler = 12 kmph Relative speed as they are moving in the same direction = (S - 12) kmph (S- 12) = 200 x 18515S - 12 = 48S = 60 kmph Hence, the speed of the train = S = 60 kmph Now, Let the speed of the jeep be 'x' kmph 60 - x = 200 x 1852060 - x = 36x = 60 - 36x = 24 kmph Therefore, the speed of the jeep = x = 24 kmph.
Q: A shopkeeper has 11 books of same cost price. He sells the first book at certain price, then he sells second book at a price which is ₹ 1 less than the selling price of first book and then he sells third book at a price which is ₹1 less than the selling price of second book. Following this pattern, he sold all 11 books. If he sells sixth book at its cost price. Find the overall percent profit or loss on selling all 11 books.
2832 05dd37ade874d2d52fa316a87
5dd37ade874d2d52fa316a87- 120%false
- 210%false
- 3false
- 4No profit no Losstrue
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Answer : 4. "No profit no Loss "
Q: The average salary of all the staff in an office of a corporate house is Rs 5,000. The average salary of the officers is Rs 14,000 and that of the rest is Rs 4,000. If the total number of staff is 500, the number of officers is
2826 05dbfaf81656bc31fa31649fc
5dbfaf81656bc31fa31649fc- 110false
- 215false
- 325false
- 450true
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Answer : 4. "50"
Q: A sum of Rs. 1600 gives a simple interest of Rs. 252 in 2 year and 3 months. The rate of interest per annum is : 2815 05cfdfc5bbc9a366f2932574d
5cfdfc5bbc9a366f2932574d- 1false
- 28%false
- 37%true
- 46%false
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Answer : 3. "7%"
Explanation :
Q: Find k, if the line 2x - 3y = 11 is perpendicular to the line 3x + ky = -4?
2813 05f0308b4e890ce63e57b4d60
5f0308b4e890ce63e57b4d60- 1-1false
- 22true
- 3-2false
- 41false
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Answer : 2. "2"
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.
2813 05eaba5b21cb95f071aa27a60
5eaba5b21cb95f071aa27a60- 12 hoursfalse
- 24 hoursfalse
- 32 hours 52 minfalse
- 45 hours 44 min.true
- 5None of thesefalse
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