IIT JEE Practice Question and Answer
8Q: 640 ml of a mixture contains milk and water in ratio 6:2. How much of the water is to be added to get a new mixture containing half milk and half water ? 1846 05b5cc731e4d2b4197774f7e7
5b5cc731e4d2b4197774f7e7- 1360 mlfalse
- 2320 mltrue
- 3310 mlfalse
- 4330 mlfalse
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Answer : 2. "320 ml"
Explanation :
Answer: B) 320 ml Explanation: Here total parts of milk and water in the solution is 6+2 = 8 parts. 1part = 640/8 = 80 old mixture contains 6parts of milk and 2 parts of water(6:2). To get new mixture containing half milk and half water, add 4parts of water to the old mixture then 6:(2+4) to make the ratio same. i.e, 4 x 80 = 320 ml.
Q: Find by how much percentage the average of first 10 odd numbers (starting from 1) is greater than the last term ? 1845 05b5cc71ee4d2b4197774f56d
5b5cc71ee4d2b4197774f56d- 1991/16 %false
- 2900/19 %true
- 3874/13 %false
- 4719/17 %false
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Answer : 2. "900/19 %"
Explanation :
Answer: B) 900/19 % Explanation: First ten odd numbers form an arithmetic progression of the form1,3,5,7,9......here a = first term = 1d = common difference = 2Average of first n numbers = (2a + (n - 1)d)/2n th term of the AP = a + (n - 1)dSubstituting a = 1, d = 2 and n = 10 in the above formulas average of first 10 numbers = 1010 th term of the AP = 19Therefore average of first 10 terms is 19 - 10 = 9 greater thanthe last term. Hence the average is greater than the sum by9/19 X 100 = 900/19 %
Q: Which sentence is written correctly? 1845 05b5cc6b3e4d2b4197774d403
5b5cc6b3e4d2b4197774d403- 1They never watch no movie during the working days, but in holidays they watch one movie.false
- 2They never watch none movie during the working days, but in holidays they watch one movie.false
- 3They don't never watch any movie during the working days, but in holidays they watch one movie.false
- 4They watch no movie during the working days, but in holidays they watch one movie.true
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Answer : 4. "They watch no movie during the working days, but in holidays they watch one movie."
Explanation :
Answer: D) They watch no movie during the working days, but in holidays they watch one movie. Explanation: They watch no movie during the working days, but in holidays they watch one movie. is correctly written among the given options.
Q: Which of the following is true about blood plasma? 1844 05b5cc622e4d2b4197774b7e4
5b5cc622e4d2b4197774b7e4- 1The main protein component is hemoglobin.false
- 2It is a faint yellow fluid.false
- 3It is the same as serum but without the clotting proteins.false
- 4It is about 90% water.true
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Answer : 4. "It is about 90% water."
Explanation :
Answer: D) It is about 90% water. Explanation: The first option is incorrect because it is devoid of blood cell, also red blood cells so doesn’t contains haemoglobin. The second option is incorrect because plasma is colorless. The third option is also incorrect because plasma contains the clotting factors.
Q: Statement: There was a spurt in criminal activities in the city during the recent festival season.Courses of action:a. The police should immediately investigate into the causes of this increase.b. In future the police should take adequate precaution to avoid recurrence of such situation during festival.c. The known criminals should be arrested before any such season. 1844 05b5cc754e4d2b4197774fbbe
5b5cc754e4d2b4197774fbbe- 1Both a and b followstrue
- 2Only c followsfalse
- 3Only a followsfalse
- 4Both b and c followsfalse
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Answer : 1. "Both a and b follows"
Explanation :
Answer: A) Both a and b follows Explanation: The police ought to find out the lackenings in existing security arrangements and make up for these inadequacies to strengthen security and thus prevent criminal activities in the forthcoming festival. So, both a and b follow. Arresting the known criminals does not ensure safety, for a novice can also indulge in crime. So, c does not follow.
Q: Microwave communication uses high-frequency. 1844 05b5cc69be4d2b4197774c7fe
5b5cc69be4d2b4197774c7fe- 1TRUEtrue
- 2FALSE Answer & Explanation Answer:false
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Answer : 1. "TRUE"
Explanation :
Answer: A) TRUE Explanation: Microwaves are high-frequency signals in the 300 MHz to 300 GHz range. This is in contrast to radio signals, which are typically broadcast in all directions. Radio signals operate in the 3 Hz to 300 MHz range. Microwave signals are used for both satellite and ground-based communications.
Q: If three eighth of a number is 141. What will be the approximately value of 32.08% of this number ? 1843 05b5cc6ebe4d2b4197774ee73
5b5cc6ebe4d2b4197774ee73- 1101false
- 2112false
- 3104false
- 4120true
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Answer : 4. "120"
Explanation :
Answer: D) 120 Explanation: K x 3/8 = 141 => K = 376 376 x 32.08/100 = 120
Q: Who did not have an important role in the Swadeshi Movement ? 1842 05b5cc6cae4d2b4197774e072
5b5cc6cae4d2b4197774e072- 1Muslimsfalse
- 2Studentsfalse
- 3Womenfalse
- 4Peasantstrue
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Answer : 4. "Peasants"
Explanation :
Answer: D) Peasants Explanation: