IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: What belongs to you but is used more by others? 1360 0

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    Clothes
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    Cosmetics
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    Shoes
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    Name
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उत्तर : 4. "Name"
व्याख्या :

Answer: D) Name Explanation: Yep! It's your NAME that belongs to you but is used more by others than you.

प्र: Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is  ? 1359 0

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    1 : 2
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    3 : 1
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    4 : 7
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    3 : 2
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उत्तर : 4. "3 : 2"
व्याख्या :

Answer: D) 3 : 2 Explanation: Let the speeds of the two trains be x m/sec and y m/sec respectively. Then, length of the first train = 27 x meters, and length of the second train = 17 y meters. (27 x + 17 y) / (x + y) = 23 => 27 x + 17 y = 23 x + 23 y => 4 x = 6 y => x/y = 3/2.

प्र: What is the conjugate base of H2O? 1359 0

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    NH3+
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    OH-
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    H2O
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    All the above
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उत्तर : 2. "OH-"
व्याख्या :

Answer: B) OH- Explanation: A conjugate acid, is a species formed by the reception of a proton (H+) by a base—in other words, it is a base with a hydrogen ion added to it. On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction. Hence, a conjugate base is a species formed by the removal of a proton from an acid. Because some acids are capable of releasing multiple protons, the conjugate base of an acid may itself be acidic. Represented as the following chemical reaction: Acid + Base ⇌ Conjugate Base + Conjugate Acid   The water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen proton donated by ammonium. On the other hand, ammonia is the conjugate base for the acid ammonium after ammonium has donated a hydrogen ion towards the production of the water molecule. We can also refer to OH- as a conjugate base of H2O, since the water molecule donates a proton towards the production of NH+4 in the reverse reaction, which is the predominating process in nature due to the strength of the base NH3 over the hydroxide ion.

प्र: There are n boxes and m fruits. If we put 3 fruits in each box 3 fruits will be excess. If we put 4 fruits in each box 1 box will be excess. Find number of boxes and fruits ? 1359 0

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    3 & 9
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    6 & 19
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    7 & 24
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    5 & 18
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उत्तर : 3. "7 & 24"
व्याख्या :

Answer: C) 7 & 24 Explanation: 7 boxes & 24 Balls.Let, n = No. of boxes ; m = No. of fruits3n+3 = m---------->(1)4(n-1)= m---------->(2)=>4n-4 = 3n+3;=>4n-3n = 4+3n = 7Put n=7 in eqn(1)=> 3(7)+3 = m21+3 = mm = 24; Number of boxes = 7 and fruits = 24

प्र: What is the Lithosphere made of? 1359 0

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    Soil
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    Rocks
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    Dirt
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    Water
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उत्तर : 2. "Rocks"
व्याख्या :

Answer: B) Rocks Explanation: Lithoshpere are composed of rocks in the crust and upper mantle that behave as brittle solids. The lithosphere is Earth's outermost layer.

प्र: A low trough is indicative of 1358 0

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    the start of a depression
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    the end of a recession
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    a serious depression
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    a growing recession
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उत्तर : 4. "a growing recession"
व्याख्या :

Answer: D) a growing recession Explanation: A low trough is indicative of "a growing recession" since a trough indicates a general change in the business cycle, which can have varying degrees of importance. A recession could be an important decline in economic activity that goes on for quite many months.

प्र: Which dinosaur is sometimes referred to as the thunder lizard? 1358 0

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    Diplodocus
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    Brontosaurus
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    Arm reptile
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    Cunningham
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उत्तर : 2. "Brontosaurus"
व्याख्या :

Answer: B) Brontosaurus Explanation: Although well known as one of the most iconic dinosaurs, Brontosaurus (the 'thunder lizard') has long been considered misclassified. Since 1903, the scientific community has believed that the genus Brontosaurus was in fact the Apatosaurus.

प्र: Guess the Hidden Alphabet in this Puzzle ? 1358 0

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    X
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    Y
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    B
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    D
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उत्तर : 1. "X"
व्याख्या :

Answer: A) X Explanation: The logic in the given puzzle is  Addition of numeric values of corresponding letters in the first three figures gives respective corresponding letter in fourth figure.  i.e, A = 1 , W = 23 , B = 2 => 2 + 1 + 23 =26 = 'Z' Similarly, L = 12, K = 11 , A = 1 => 1 + 11 + 12 = 24 = 'X' Here the missing letter is 'X'.

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