IIT JEE Practice Question and Answer
8Q: Which best describes Genes? 3239 05b5cc601e4d2b4197774b467
5b5cc601e4d2b4197774b467- 1long, double chains of nucleic acids.true
- 2long, single chains of amino acids.false
- 3long, single chains of nucleic acids.false
- 4long, double chains of amino acids.false
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Answer : 1. "long, double chains of nucleic acids."
Explanation :
Answer: A) long, double chains of nucleic acids. Explanation: Gene is a segment of chromosomal DNA or a sequence of DNA or RNA that codes for a molecule that has a function. It is the basic physical and functional unit of heredity. As genes are made up of DNA it impies that they are long, double chains of nucleic acids as DNA is made of nucleic acids.
Q: Choose the Antonym of the given word from the following options 'Jettison' 3238 05b5cc761e4d2b4197774fd02
5b5cc761e4d2b4197774fd02- 1Salvagetrue
- 2Submergefalse
- 3Repentfalse
- 4Descendfalse
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Answer : 1. "Salvage"
Explanation :
Answer: A) Salvage Explanation: 'Jettison' means to discard and 'salvage' means to rescue something discarded. Hence, 'salvage' is the word which is farthest in meaning to the given word 'Jettison'.
Q: Which is not a sediment transporting agent? 3232 05b5cc66de4d2b4197774bfa5
5b5cc66de4d2b4197774bfa5- 1Stratificationtrue
- 2Windstormsfalse
- 3Glacial Icefalse
- 4Stream waterfalse
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Answer : 1. "Stratification"
Explanation :
Answer: A) Stratification Explanation: Stratification as actually the settling down of sediments with different properties to form layers/strata over years. Stratification especially occurs on the bed of water bodies such as oceans. Stratified sedimentary rocks are used to study the ecological conditions over previous years/eras. The other choices like Windstorms, Glacial Ice and Stream water are mediums which sediments are transported.
Q: The number of permutations of the letters of the word 'MESMERISE' is ? 3228 05b5cc6ebe4d2b4197774ee5f
5b5cc6ebe4d2b4197774ee5f- 19!/(2!)^{2}x3!true
- 29! x 2! x 3!false
- 30false
- 4Nonefalse
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Answer : 1. "9!/(2!)^{2}x3!"
Explanation :
Answer: A) 9!/(2!)^{2}x3! Explanation: n items of which p are alike of one kind, q alike of the other, r alike of another kind and the remaining are distinct can be arranged in a row in n!/p!q!r! ways.The letter pattern 'MESMERISE' consists of 10 letters of which there are 2M's, 3E's, 2S's and 1I and 1R.Number of arrangements = 9!(2!)2×3!
Q: The brain of any computer system is 3224 15b5cc607e4d2b4197774b54e
5b5cc607e4d2b4197774b54e- 1CPUtrue
- 2Memoryfalse
- 3Controlfalse
- 4ALUfalse
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Answer : 1. "CPU"
Explanation :
Answer: A) CPU Explanation: Central Processing Unit (CPU) is the brain of any computer system.
Q: 11 letter Indian city is I am Hints :: 2,4,10 is a Unit of Length . Last 6 letters is a Fruit Name. 9,5,3 is a Soap Name. 1,8,3 is used by a Student 7,8,3 letters is a Bird Name. 6,7,5,3 is an organ in the Face. From the above given Hints Find that Indian City Name? 3222 05b5cc6b6e4d2b4197774d59d
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Answer :
Explanation :
PONDICHERRY is the Indian City with 11 Letters. Fruit Name : CHERRY Soap Name : RIN Bird Name : HEN Organ : CHIN Used by Student : PEN
Q: The reactivity of an atom arises from 3222 05b5cc64de4d2b4197774bc9d
5b5cc64de4d2b4197774bc9d- 1the existence of unpaired electrons in the valence shelltrue
- 2the energy differences between the electron shellsfalse
- 3the sum of the potential energies of all the electron shellsfalse
- 4the average distance of the outermost electron shell from the nucleusfalse
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Answer : 1. "the existence of unpaired electrons in the valence shell"
Explanation :
Answer: A) the existence of unpaired electrons in the valence shell Explanation: When atoms react they do so in order to reach the lowest energy, which is the most stable. The electrons orbitals will overlap in the way that reduces the energy the most. Orbitals of similar energy will produce the greatest stabilisation.The answer you gave isn't the whole story, it depends what species is reacting with what. The effective nuclear charge on the atom will affect the energy of the valance electrons. Hence, the reactivity of an atom arises from the existence of unpaired electrons in the valence shell.
Q: Which acid is produced when milk gets sour? 3220 05b5cc69de4d2b4197774c8c6
5b5cc69de4d2b4197774c8c6- 1Lactic acidtrue
- 2Acetic acidfalse
- 3Tartaric acidfalse
- 4Butyric acidfalse
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Answer : 1. "Lactic acid"
Explanation :
Answer: A) Lactic acid Explanation: