IIT JEE Practice Question and Answer
8Q: The ratio of present ages of Hema and Chinnu is 13:17. Four years ago the ratio of their ages was 11:15. What will be the ratio of their ages six years hence ? 1929 05b5cc736e4d2b4197774f86f
5b5cc736e4d2b4197774f86f- 13 : 7false
- 27 : 9false
- 34 : 5true
- 41 : 3false
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Answer : 3. "4 : 5"
Explanation :
Answer: C) 4 : 5 Explanation: Let their present ages be 13x and 17x.Then, 13x-4/17x-4 = 11/15. Solving this, we get x = 2.Required ratio = 13x2 + 6/17x2 + 6 = 32/40 = 4/5.
Q: Which of the following is an Autotroph? 1929 05b5cc6b1e4d2b4197774d355
5b5cc6b1e4d2b4197774d355- 1Fishfalse
- 2Algaetrue
- 3Butterflyfalse
- 4Mushroomfalse
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Answer : 2. "Algae"
Explanation :
Answer: B) Algae Explanation: Here from the above options, Algae is an Autotroph. Autotrophs : An Autotroph is also called as Producer, is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions.
Q: What is the oxidation number of sulfur in H2S? 1928 05b5cc645e4d2b4197774bb8b
5b5cc645e4d2b4197774bb8b- 12false
- 2-2true
- 31false
- 4-1false
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Answer : 2. "-2"
Explanation :
Answer: B) -2 Explanation: The sum of the oxidation numbers in a compound must equal zero. In the compound hydrogen sulfide, H2S, the two hydrogen atoms have an oxidation number of +1, for a total of +2. Therefore, the oxidation number of sulfur in the compound is -2, and the sum of the oxidation numbers is 0.
Q: Find out the wrong term in the following number series. 4, 16, 37, 58, 81. 1927 05b5cc6cae4d2b4197774e09a
5b5cc6cae4d2b4197774e09a- 116false
- 237false
- 381true
- 44false
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Answer : 3. "81"
Explanation :
Answer: C) 81 Explanation: The series follows the following pattern. 4 16 = 42 37 = 12+62 58 = 32+72 81 ≠52+82. Here every number is based on the digits of previous number. Hence, 81 is the wrong number in the given series.
Q: I am an 8 letter word. First 4 is the question. 2, 3, 4 protects our head. 5, 6, 7 IT company name. 7 & 8 are the same letters. Who am I? 1927 05b5cc6a7e4d2b4197774cdee
5b5cc6a7e4d2b4197774cdee- Show AnswerHide Answer
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Answer :
Explanation :
That 8 letter word is Whatsapp (a messenger app) First four letters: WHAT a question Letters 2,3,4: HAT protects our headLetters 5,6,7: SAP an IT companyLetters 7,8: PP same.
Q: Which statement is one component of the cell theory? 1927 05b5cc683e4d2b4197774c2d6
5b5cc683e4d2b4197774c2d6- 1DNA is the basis of genetic transferfalse
- 2All living cells arise from pre-existing cellstrue
- 3All cells are composed of same organellesfalse
- 4Tissues are formed from combinations of cellsfalse
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Answer : 2. "All living cells arise from pre-existing cells"
Explanation :
Answer: B) All living cells arise from pre-existing cells Explanation: All living cells arise from pre-existing cells is one component of the cell theory. The Cell Theory is one of the basic principles of biology. The Cell Theory states: 1. All living organisms are composed of cells. They may be unicellular or multicellular. 2. The cell is the basic unit of life. 3. Cells arise from pre-existing cells.
Q: Select the correct statement about the Evolution of Animals. 1927 05b5cc6b0e4d2b4197774d29d
5b5cc6b0e4d2b4197774d29d- 1The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old.true
- 2No animal fossils are found in strata formed before the Cambrian explosion.false
- 3Approximately half the phyla of living organisms are found in Cambrian sediments.false
- 4All the abovefalse
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Answer : 1. "The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old."
Explanation :
Answer: A) The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old. Explanation: The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old.
Q: What three statements make up the cell theory? 1926 05b5cc60ae4d2b4197774b5c4
5b5cc60ae4d2b4197774b5c4- 1All living things are made up of cells.false
- 2New cells come frome exisiting cells.false
- 3Cells are the basic unit of structure/function in living things.false
- 4All of the abovetrue
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Answer : 4. "All of the above"
Explanation :
Answer: D) All of the above Explanation: The three statements make up the cell theory are:: 1. All living things are made up of cells. 2. Cells are the basic unit of structure/function in living things. 3. New cells come frome exisiting cells. These cells can vary widely, but all living things are composed of cells.