IIT JEE Practice Question and Answer
8Q: A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in ? 1965 05b5cc6e5e4d2b4197774ed2e
5b5cc6e5e4d2b4197774ed2e- 120 hrstrue
- 228 hrsfalse
- 336 hrsfalse
- 440 hrsfalse
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Answer : 1. "20 hrs"
Explanation :
Answer: A) 20 hrs Explanation: 1/8 - 1/x = 1/10 => x = 40 hrs
Q: 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 ? 1965 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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Answer : 4. "14 min 40 sec."
Explanation :
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.
Q: What should come in place of the question mark(?) in the following questions ? 316 + 412 - 223 - 11112 = ? 1965 05b5cc6fbe4d2b4197774f0ec
5b5cc6fbe4d2b4197774f0ec- 11 7/12false
- 21 5/12false
- 33 7/12false
- 43 1/12true
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Answer : 4. "3 1/12"
Explanation :
Answer: D) 3 1/12 Explanation: ? = (3 + 4 - 2 - 1) + ( 1/6 + 1/2 - 2/3 - 11/12) = 4 + [(2+6-8-11)/12] = 4 - (11/12 )= 31/12.
Q: Virus doubles every 3 mins. It is 'K' in 1 hour, when was it K/4 ? 1964 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: The first country to make a constitution 1962 05b5cc69ee4d2b4197774c965
5b5cc69ee4d2b4197774c965- 1Russiafalse
- 2United Statestrue
- 3Francefalse
- 4North Koreafalse
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Answer : 2. "United States"
Explanation :
Answer: B) United States Explanation: The United States Constitution, ratified June 21, 1788, was influenced by the writings of Polybius, Locke, Montesquieu, and others. The document became a benchmark for republicanism and codified constitutions written thereafter. The Polish–Lithuanian Commonwealth Constitution was passed on May 3, 1791.
Q: Which of these is an example of negative feedback? 1962 05b5cc62ce4d2b4197774b93e
5b5cc62ce4d2b4197774b93e- 1After you eat, insulin stimulates the lowering of blood sugar levels.true
- 2Once labor begins, contractions increase in frequency and intensity.false
- 3After you eat, glucagon stimulates an increase in blood sugar levels.false
- 4As a blood clot begins to form, the process of its formation gets faster and faster.false
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Answer : 1. "After you eat, insulin stimulates the lowering of blood sugar levels."
Explanation :
Answer: A) After you eat, insulin stimulates the lowering of blood sugar levels. Explanation: Eating raises blood sugar levels, insulin stimulates the lowering of blood sugar level. In this example the response to the stimulus (increased blood sugar levels) opposes that stimulus (by lowering blood sugar levels).
Q: How can investors receive compounding returns? 1961 05b5cc688e4d2b4197774c2ff
5b5cc688e4d2b4197774c2ff- 1By investing their earnings back into their original investmenttrue
- 2By diversifying their investment portfoliofalse
- 3By selecting a savings account that has a higher interest ratefalse
- 4By transferring their earnings back into high-risk investmentfalse
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Answer : 1. "By investing their earnings back into their original investment"
Explanation :
Answer: A) By investing their earnings back into their original investment Explanation:
Q: What is the time required to punch 1500 cards of 45 column each at the rate of 9,000 punches per hour ? 1960 05b5cc711e4d2b4197774f3e1
5b5cc711e4d2b4197774f3e1- 18 hrsfalse
- 27 hrs 15 minfalse
- 37 hrs 30 mintrue
- 48 hrs 20 minfalse
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Answer : 3. "7 hrs 30 min"
Explanation :
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.