GATE Practice Question and Answer
8Q: Which of the following has the highest frequency? 2418 05b5cc698e4d2b4197774c62c
5b5cc698e4d2b4197774c62c- 1Cosmic raystrue
- 2X-raysfalse
- 3Radio wavesfalse
- 4Microwavesfalse
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Answer : 1. "Cosmic rays"
Explanation :
Answer: A) Cosmic rays Explanation:
Q: Two bottles contains mixture of milk and water. First bottle contains 64% milk and second bottle contains 26% water. In what ratio these two mixtures are mixed so that new mixture contains 68% milk? 2417 05b5cc626e4d2b4197774b82a
5b5cc626e4d2b4197774b82a- 13 : 2true
- 22 : 1false
- 31 : 2false
- 42 : 3false
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Answer : 1. "3 : 2"
Explanation :
Answer: A) 3 : 2 Explanation: % of milk in first bottle = 64% % of milk in second bottle = 100 - 26 = 74% Now, ATQ 64% 74% 68% 6 4 Hence, by using allegation method, Required ratio = 3 : 2
Q: A can build a wall in 16 days while B can destroy it in 8 days. A worked for 5 days. Then B joined with A for the next 2 days. Find in how many days could A build the remaining wall ? 2415 05b5cc6cee4d2b4197774e208
5b5cc6cee4d2b4197774e208- 112 daysfalse
- 214 daysfalse
- 313 daystrue
- 416 daysfalse
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Answer : 3. "13 days"
Explanation :
Answer: C) 13 days Explanation: Now, Total work = LCM(16, 8) = 48 A's one day work = + 48/16 = + 3 B's one day work = - 48/8 = -6 Given A worked for 5 days to build the wall => 5 days work = 5 x 3 = + 15 2days B joined with A in working = 2(3 - 6) = - 6 Remaining Work of building wall = 48 - (15 - 6) = 39 Now this remaining work will be done by A in = 39/3 = 13 days.
Q: Is blood homogeneous or heterogeneous? 2412 05b5cc626e4d2b4197774b86f
5b5cc626e4d2b4197774b86f- 1Homogeneousfalse
- 2Heterogeneoustrue
- 3Both A & Bfalse
- 4None of the abovefalse
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Answer : 2. "Heterogeneous"
Explanation :
Answer: B) Heterogeneous Explanation: Blood is a heterogeneous mixture because the blood cells are physically separate from the blood plasma. The cells have different properties than the plasma. The cells can be separated from the plasma by centrifuging, which is a physical change.
Q: K is 50% faster than L. If L starts at 9 A.M. and K starts at 10 A.M. L travels at a speed of 50 km/hr. If L and K are 300 kms apart, The time when they meet when they travel in opposite direction is ? 2412 05b5cc741e4d2b4197774f9e5
5b5cc741e4d2b4197774f9e5- 112 pmtrue
- 21 pmfalse
- 311 amfalse
- 411:30 amfalse
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Answer : 1. "12 pm"
Explanation :
Answer: A) 12 pm Explanation: let 't' be the time after which they met since L starts. Given K is 50% faster than L 50 t + 1.5*50(t-1) = 300 50 t +75 t = 300 + 75 t = 375 / 125 = 3 hrs past the time that L starts So they meet at (9 + 3)hrs = 12:00 noon.
Q: Assertion( 2411 05b5cc758e4d2b4197774fbd5
5b5cc758e4d2b4197774fbd5- 1: Most of the Himalayan rivers are perennial.Reason(R) : They are fed by melting snow. A) R correctly explains Atrue
- 2R is true but A is falefalse
- 3A is true but R is falsefalse
- 4A) R correctly explains A B) R is true but A is fale C) A is true but R is false D)false
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Answer : 1. ": Most of the Himalayan rivers are perennial.Reason(R) : They are fed by melting snow.
A) R correctly explains A"
Explanation :
Answer: A) R correctly explains A Explanation: Most Himalayan rivers are perennial because they are fed by the melting snow throughout the year.Thus, both A and R are true & R correctly explains A.
Q: The average temperature of Monday to Wednesday was 37 C and of Tuesday to Thursday was 34 C. If the temperature on Thursday was 4/5 th of that of Monday, the temperature on Thursday was ? 2411 05b5cc741e4d2b4197774f986
5b5cc741e4d2b4197774f986- 135 cfalse
- 236 ctrue
- 334 cfalse
- 432 cfalse
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Answer : 2. "36 c"
Explanation :
Answer: B) 36 c Explanation: Monday + Tuesday + Wednesday = 37 x 3 -----------(1)Tuesday + Wednesday + Thursday = 34 x 3---------(2)Thursday = 4/5 of Monday ------------------(3)subtract eqn (1) from (2) we get,Thursday - Monday = -9 => Monday - Thursday = 9.......(4)From (3) & (4), we get So,Thursday = 36 C
Q: Kamal consistently runs 240 meters a day and on Saturday he runs for 400 meters. How many kilometers will he have to run in four weeks ? 2411 05b5cc6c5e4d2b4197774dd23
5b5cc6c5e4d2b4197774dd23- 15.75 kmsfalse
- 27.36 kmstrue
- 38.2 kmsfalse
- 46.98 kmsfalse
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Answer : 2. "7.36 kms"
Explanation :
Answer: B) 7.36 kms Explanation: Total running distance in four weeks = (24 x 240) + (4 x 400) = 5760 + 1600 = 7360 meters = 7360/1000 => 7.36 kms