IIT JEE Practice Question and Answer
8Q: A is sister of B who is mother of C who is mother of D. E is the grand mother of D. Then how C is related to E ? 1670 05b5cc6e5e4d2b4197774ed60
5b5cc6e5e4d2b4197774ed60- 1Sisterfalse
- 2Daughterfalse
- 3Motherfalse
- 4Daughter-in-lawtrue
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Answer : 4. "Daughter-in-law"
Explanation :
Answer: D) Daughter-in-law Explanation: GM GMA ---- B ---- E | | C | | D (Grand son or daughter)
Q: The average age of Vishal and Raghavendra is 24 years. If a new person Veerender is also included, the average age is increased by 1.5 years. What is the age of Veerender? 1669 05b5cc69de4d2b4197774c897
5b5cc69de4d2b4197774c897- 128.5 yrstrue
- 229.5 yrsfalse
- 330.5 yrsfalse
- 427 yrsfalse
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Answer : 1. "28.5 yrs"
Explanation :
Answer: A) 28.5 yrs Explanation: According to the given data, (V + R)/2 = 24 Now, after joining of Veerender, V + R + D)/3 = 25.5 Hence, Veerender Age = 3(25.5) - 2(24) = 76.5 - 48 = 28.5 years.
Q: What are the sides of the dna ladder made of 1669 05b5cc690e4d2b4197774c46a
5b5cc690e4d2b4197774c46a- 1nitrates and sugarsfalse
- 2sugars and hydratesfalse
- 3sugars and phosphatestrue
- 4phosphates and nitratesfalse
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Answer : 3. "sugars and phosphates"
Explanation :
Answer: C) sugars and phosphates Explanation: DNA is a double-stranded molecule twisted into a helix. The shape of DNA is a double helix, which is like a twisted ladder. The sides of the ladder are made of alternating sugar and phosphate molecules. Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA. The rungs of the ladder are pairs of 4 types of nitrogen bases.
Q: Who termed the Indian Constitution as "Quasi Federal" ? 1669 05b5cc6c3e4d2b4197774dc40
5b5cc6c3e4d2b4197774dc40- 1D.D. Basufalse
- 2K.C. Whearetrue
- 3Ivor Jenningsfalse
- 4M.V. Payleefalse
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Answer : 2. "K.C. Wheare"
Explanation :
Answer: B) K.C. Wheare Explanation:
Q: An express traveled at an average speed of 100 km/hr, stopping for 4 min after every 75 km. How long did it take to reach its destination 600 km from the starting point ? 1668 05b5cc6e1e4d2b4197774eba7
5b5cc6e1e4d2b4197774eba7- 16 hrs 24 minfalse
- 26 hrsfalse
- 37 hrs 21 minfalse
- 46 hrs 28 mintrue
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Answer : 4. "6 hrs 28 min"
Explanation :
Answer: D) 6 hrs 28 min Explanation: Time taken to cover 600 km = 600/100 = 6 hrs. Number of stoppages = 600/75 - 1 = 7 Total time of stoppages = 4 x 7 = 28 min Hence, total time taken = 6 hrs 28 min.
Q: which of the following are chemical changes? 1668 05b5cc6a7e4d2b4197774ce09
5b5cc6a7e4d2b4197774ce09- 1Cooking of Foodtrue
- 2Digestion of Foodfalse
- 3Freezing of waterfalse
- 4Water is heated upfalse
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Answer : 1. "Cooking of Food"
Explanation :
Answer: A) A & B Explanation: A) Cooking of Food ------ Chemical Change B) Digestion of Food ----- Chemical Change C) Freezing of water ----- Physical Change D) Water is heated up ---- Physical Change because here the chemical composition of the substance changes in A & B only. Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.
Q: What provides electrons for the light reactions? 1668 05b5cc6abe4d2b4197774d03e
5b5cc6abe4d2b4197774d03e- 1Watertrue
- 2Oxygenfalse
- 3Carbon dioxidefalse
- 4Lightfalse
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Answer : 1. "Water"
Explanation :
Answer: A) Water Explanation: Electrons are stripped from water in the light reactions of photosynthesis. Light provides the energy to excite electrons. ATP and NADPH are both products of the light reactions and are used to power the Calvin cycle.
Q: In a triangle ABC, angle 'a' is the smallest one & A+7B = 112. Find the range of value 'c' ? 1668 05b5cc6f4e4d2b4197774efe6
5b5cc6f4e4d2b4197774efe6- 1138 to 164false
- 2125 to 147false
- 3148 to 158false
- 4152 to 164true
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Answer : 4. "152 to 164"
Explanation :
Answer: D) 152 to 164 Explanation: A+7B=112 it is clear that A = 14, then it becomes A>=B, but A is smallest angle) givenso, range of A is 0.0001 to 13.9999 ( I am taking upto 4 decimal places)so, range of B becomes 14 to 16 ( after rounding off to 4 decimal places)so, range of C becomes 152 to 164 ( after rounding off to 4 decimal places)