IIT JEE Practice Question and Answer
8Q: What can you hear but not touch or see? 1787 05b5cc69ee4d2b4197774c96a
5b5cc69ee4d2b4197774c96a- Show AnswerHide Answer
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Answer :
Explanation :
The sound is what can you hear but not touch or see.
Q: Which vehicle is spelled the same forwards and backwards? 1787 05b5cc669e4d2b4197774bf57
5b5cc669e4d2b4197774bf57- Show AnswerHide Answer
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Answer :
Explanation :
Racecar and Civic are the two vehicles which spelled the same forwards an backwards.
Q: If N is the greatest number that will divide 1305, 4665 and 6905, leaving the same remainder in each case. What is the sum of the digits of N ? 1786 05b5cc731e4d2b4197774f7fb
5b5cc731e4d2b4197774f7fb- 16false
- 28false
- 34true
- 49false
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Answer : 3. "4"
Explanation :
Answer: C) 4 Explanation: N = H.C.F. of (4665 - 1305), (6905 - 4665) and (6905 - 1305) = H.C.F. of 3360, 2240 and 5600 = 1120. Sum of digits in N = ( 1 + 1 + 2 + 0 ) = 4
Q: What can be swallowed but can swallow you? 1785 05b5cc62ce4d2b4197774b93d
5b5cc62ce4d2b4197774b93d- Show AnswerHide Answer
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Answer :
Explanation :
Your Pride. Yes, you can swallow your pride or it can swallow you.
Q: 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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Answer : 3. "1/221"
Explanation :
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.
Q: Which of the following has the highest entropy? 1783 05b5cc669e4d2b4197774bf31
5b5cc669e4d2b4197774bf31- 1Hydrogentrue
- 2Diamondfalse
- 3Liquid nitrogenfalse
- 4Mercuryfalse
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Answer : 1. "Hydrogen"
Explanation :
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.
Q: 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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Answer : 3. "54 min"
Explanation :
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.
Q: 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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Answer : 2. "100"
Explanation :
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.