CAT प्रश्न और उत्तर का अभ्यास करें
8प्र: Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank ? 1769 05b5cc6e0e4d2b4197774eb48
5b5cc6e0e4d2b4197774eb48- 115 min 20 sec.false
- 216 min 40 sec.false
- 313 min 10 sec.false
- 414 min 40 sec.true
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उत्तर : 4. "14 min 40 sec."
व्याख्या :
Answer: D) 14 min 40 sec. Explanation: Part filled in 4 minutes = 4(1/15 + 1/20) = 7/15 Remaining part = 1 - 7/15 = 8/15 Part filled by B in 1 minute = 1/20 1/20 : 8/15 :: 1 : k k = (8/15 )x 1 x 20 = 10( 2/3) min = 10 min 40 sec. The tank will be full in (4 min. + 10 min. 40 sec) = 14 min 40 sec.
प्र: The most populous city in the world is ? 1676 05b5cc6e0e4d2b4197774eb3e
5b5cc6e0e4d2b4197774eb3e- 1Tokyotrue
- 2Parisfalse
- 3Pekingfalse
- 4Londonfalse
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उत्तर : 1. "Tokyo"
व्याख्या :
Answer: A) Tokyo Explanation:
प्र: Train K crosses a pole in 30 seconds and train L crosses the same pole in one minute and 20 seconds. The length of train K is three-fourths the length of train L. What is the ratio of the speed of train K to that of train L ? 1388 05b5cc6e0e4d2b4197774eb39
5b5cc6e0e4d2b4197774eb39- 11 : 3false
- 22 : 1true
- 33 : 1false
- 41 : 2false
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उत्तर : 2. "2 : 1"
व्याख्या :
Answer: B) 2 : 1 Explanation: Given that train K crosses a pole in 30 seconds and train L crosses the same pole in one minute and 15 seconds. Let the length of train K be Lk and that of train L be Ll given that Lk = 3/4 Ll As the train K and L crosses the pole in 30 seconds and 80 seconds respectively, => Speed of train K = sk = Lk/30 Speed of train L = sl = Ll/80 Lk = 3/4 Ll => sk = 3/4 Ll/(30) = Ll/40 Ratio of their speeds = sk : sl = Ll/40 : Ll/80 => 1/40 : 1/80 = 2 : 1
प्र: Brass gets discoloured in air because of the presence of which of the following gases in air ? 2642 05b5cc6e0e4d2b4197774eb34
5b5cc6e0e4d2b4197774eb34- 1Hydrogen sulphidetrue
- 2Oxygenfalse
- 3Nitrogenfalse
- 4Carbon dioxidefalse
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उत्तर : 1. "Hydrogen sulphide"
व्याख्या :
Answer: A) Hydrogen sulphide Explanation:
प्र: If the C.I. on a sum for 2 years at 12 1/2 % per annum is Rs. 510, the S.I. on the same sum at the same rate for the same period of time is ? 1667 05b5cc6e0e4d2b4197774eb2a
5b5cc6e0e4d2b4197774eb2a- 1Rs. 580false
- 2Rs. 480true
- 3Rs. 550false
- 4Rs. 470false
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उत्तर : 2. "Rs. 480"
व्याख्या :
Answer: B) Rs. 480 Explanation: Let the sum be Rs. P. Then, P1+252x1002-P= 510 P[982- 1] = 510. Sum = Rs. 1920 So, S.I. = (1920 x 25 x 2) / (2 x 100) = Rs. 480
प्र: The first synthetic fibre made by man was ____ ? 4566 15b5cc6e0e4d2b4197774eb2f
5b5cc6e0e4d2b4197774eb2f- 1Rayonfalse
- 2Terycottfalse
- 3Polyesterfalse
- 4Nylontrue
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उत्तर : 4. "Nylon"
व्याख्या :
Answer: D) Nylon Explanation:
प्र: After independence, the first state organized on the basis of language age is ? 2742 25b5cc6dfe4d2b4197774eb25
5b5cc6dfe4d2b4197774eb25- 1Karnatakafalse
- 2Punjabfalse
- 3Gujaratfalse
- 4Andhra Pradeshtrue
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उत्तर : 4. "Andhra Pradesh"
व्याख्या :
Answer: D) Andhra Pradesh Explanation:
प्र: How many seconds will a 600 m long train take to cross a man walking with a speed of 7 km/hr in the direction of the moving train if the speed of the train is 67 km/hr ? 1557 05b5cc6dfe4d2b4197774eb20
5b5cc6dfe4d2b4197774eb20- 129 secfalse
- 258 secfalse
- 336 sectrue
- 444 secfalse
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उत्तर : 3. "36 sec"
व्याख्या :
Answer: C) 36 sec Explanation: Speed of train relative to man = 67 - 7 = 60 km/hr.= 60 x 5/18 = 50/3 m/sec. Time taken to pass the man = 600 x 3/50 = 36 sec.