CAT प्रश्न और उत्तर का अभ्यास करें
8प्र: If two cards are taken one after another without replacing from a pack of 52 cards. What is the probability for the two cards be Ace ? 1784 05b5cc74ae4d2b4197774fa81
5b5cc74ae4d2b4197774fa81- 151/1221false
- 242/221false
- 31/221true
- 452/1245false
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उत्तर : 3. "1/221"
व्याख्या :
Answer: C) 1/221 Explanation: Total Combination of getting a card from 52 cards = C152 Because there is no replacement, so number of cards after getting first card= 51 Now, Combination of getting an another card= C151 Total combination of getting 2 cards from 52 cards without replacement= (C152×C151) There are total 4 Ace in stack. Combination of getting 1 Ace is = C14 Because there is no replacement, So number of cards after getting first Ace = 3 Combination of getting an another Ace = C13 Total Combination of getting 2 Ace without replacement=C14×C13 Now,Probability of getting 2 cards which are Ace =C14×C13C152×C151 = 1/221.
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उत्तर :
व्याख्या :
11 P in a CT means 11 Players in a Cricket Team.
प्र: Virus doubles every 3 mins. It is 'K' in 1 hour, when was it K/4 ? 1783 05b5cc711e4d2b4197774f3a3
5b5cc711e4d2b4197774f3a3- 129 minfalse
- 225 minfalse
- 354 mintrue
- 457 minfalse
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उत्तर : 3. "54 min"
व्याख्या :
Answer: C) 54 min Explanation: If virus is K in 1hr i.e 60 minthen in 57 min it was K/2 as it doubles every 3 minutes=> In 54 min it was K/4.At 54 minutes it was K/4.
प्र: General Knowledge Challenge : 1783 05b5cc6c6e4d2b4197774de45
5b5cc6c6e4d2b4197774de45- 11false
- 22false
- 33true
- 44false
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उत्तर : 3. "3"
व्याख्या :
Answer: C) 3 Explanation:
प्र: What is the time required to punch 1500 cards of 45 column each at the rate of 9,000 punches per hour ? 1783 05b5cc711e4d2b4197774f3e1
5b5cc711e4d2b4197774f3e1- 18 hrsfalse
- 27 hrs 15 minfalse
- 37 hrs 30 mintrue
- 48 hrs 20 minfalse
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उत्तर : 3. "7 hrs 30 min"
व्याख्या :
Answer: C) 7 hrs 30 min Explanation: Total number of cards = 1500total columns = 45so, total punches=1500 x 45 = 67500for 1 hour if we make 9000 punches, we require 67500/9000 = 7.5so 7hours:30mins.
प्र: Which of the following has the highest entropy? 1783 05b5cc669e4d2b4197774bf31
5b5cc669e4d2b4197774bf31- 1Hydrogentrue
- 2Diamondfalse
- 3Liquid nitrogenfalse
- 4Mercuryfalse
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उत्तर : 1. "Hydrogen"
व्याख्या :
Answer: A) Hydrogen Explanation: Entropy is a measure of disorder . It will be maximum in gases followed by liquids and least in solids. Hence, here the gas is only hydrogen and it has the highest entropy.
प्र: Pavan and Sravan are two persons. If Pavan works with his actual efficiency and Sravan twice of his actual efficiency then it takes 25 days to complete the work. But If Pavan works twice of his actual efficiency and Sravan with his normal efficiency then the work is completed in 20 days. How many days would it take if Sravan alone works with his actual efficiency (in Days)? 1783 05b5cc6c7e4d2b4197774ded2
5b5cc6c7e4d2b4197774ded2- 150false
- 2100true
- 370false
- 435false
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उत्तर : 2. "100"
व्याख्या :
Answer: B) 100 Explanation: Let the Efficiency of pavan be E(P) Let the Efficiency of sravan be E(S) Here Work W = LCM(25,20) = 100 Now, E(P+2S) = 100/25 = 4 ....(1) E(2P+S) = 100/20 = 5 ....(2) Hence, from (1) & (2) we get E(S) = 1 => Number of days Savan alone work to complete the work = 100/1 = 100 days.
प्र: Do plant cells have Mitochondria? 1783 05b5cc6a3e4d2b4197774cbf7
5b5cc6a3e4d2b4197774cbf7- 1Yestrue
- 2Nofalse
- 3Can't be determinedfalse
- 4Nonefalse
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उत्तर : 1. "Yes"
व्याख्या :
Answer: A) Yes Explanation: Yes, plant cells have Mitochondria. While plant cells have chloroplasts to photosynthesize, they also require ATP for cellular functions, and do use oxygen to break down some of the sugar they produce in order to generate that ATP. They need mitochondria for this. In particular, at night when there is no light, plants undergo cellular respiration since there is no sunlight to photosynthesize. They do, however, produce far more sugar and oxygen through photosynthesis than they use up in respiration.