IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: Dry ice is an example of which process 1936 05b5cc690e4d2b4197774c455
5b5cc690e4d2b4197774c455- 1Condensationfalse
- 2Evaporationfalse
- 3Sublimationtrue
- 4Freezingfalse
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उत्तर : 3. "Sublimation"
व्याख्या :
Answer: C) Sublimation Explanation: Sublimation is a process when a solid changes directly into gas instead changing into liquid first. Dry ice is an example of Sublimation process because it doesn't change into liquid CO2 and directly change into gaseous CO2 when heated. Hence, Dry ice is an example of Sublimation process.
प्र: Sneha’s weight is 140% of Veena’s weight. Rina’s weight is 90% of Sana’s weight. Sana weighs twice as much as Veena. If Sneha’s weight is x% of Rina’s weight, then x is equal to: 1936 05b5cc699e4d2b4197774c750
5b5cc699e4d2b4197774c750- 1596/9false
- 2605/9false
- 3645/9false
- 4700/9true
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उत्तर : 4. "700/9"
व्याख्या :
Answer: D) 700/9 Explanation: Let Veena's weight = 1 kg Sana's weight = 2 kg Sneha's weight = 1.4 kg Rina's weight = 1.8 kg Now,according to the given data in the question, 1.8x100 = 1.4 x = 1.4 × 1001.8 = 7009 = 77 79.
प्र: The storage form of glucose in animals is 1935 05b5cc66de4d2b4197774bff3
5b5cc66de4d2b4197774bff3- 1Starchfalse
- 2Glucosefalse
- 3Glycogentrue
- 4None of the abovefalse
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उत्तर : 3. "Glycogen"
व्याख्या :
Answer: C) Glycogen Explanation: Glycogen is the storage form of glucose in animals and humans which is analogous to the starch in plants. Glycogen is synthesized and stored mainly in the liver and the muscles.
प्र: What is Iron Ore used for? 1935 05b5cc6ade4d2b4197774d113
5b5cc6ade4d2b4197774d113- 1Aluminiumfalse
- 2Copperfalse
- 3Steeltrue
- 4Brassfalse
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उत्तर : 3. "Steel"
व्याख्या :
Answer: C) Steel Explanation: The primary use of iron ore is in the production of iron. Most of the iron produced is then used to make steel. Steel is used to make automobiles, locomotives, ships, beams used in buildings, furniture, paper clips, tools, reinforcing rods for concrete, bicycles, and thousands of other items.
प्र: What is the smallest number by which 2880 must be divided in order to make it into a perfect square ? 1935 05b5cc74fe4d2b4197774fb0d
5b5cc74fe4d2b4197774fb0d- 12false
- 23false
- 34false
- 45true
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उत्तर : 4. "5"
व्याख्या :
Answer: D) 5 Explanation: By trial and error method, we get2880/3 = 960 is not a perfect square2880/4 = 720 is not a perfect square2880/5 = 576 which is perfect square of 24Hence, 5 is the least number by which 2880 must be divided in order to make it into a perfect square.
प्र: 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 x 0 + 1 + 1 = ? 1935 05b5cc611e4d2b4197774b63b
5b5cc611e4d2b4197774b63b- 10false
- 22false
- 312true
- 410false
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उत्तर : 3. "12"
व्याख्या :
Answer: C) 12 Explanation: Given 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 x 0 + 1 + 1 Using BODMAS Rule, As multiplication precedes addition, 1 x 0 = 0, Now, 10 + 0 + 1 + 1 = 10 + 2 = 12. Hence, 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 x 0 + 1 + 1 = 12.
प्र: States earn maximum revenue through 1934 05b5cc69fe4d2b4197774ca05
5b5cc69fe4d2b4197774ca05- 1excise dutiesfalse
- 2commercial taxestrue
- 3land revenuefalse
- 4custom revenuefalse
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उत्तर : 2. "commercial taxes"
व्याख्या :
Answer: B) commercial taxes Explanation:
प्र: A Committee of 5 persons is to be formed from a group of 6 gentlemen and 4 ladies. In how many ways can this be done if the committee is to be included atleast one lady? 1934 05b5cc7d1e4d2b41977751286
5b5cc7d1e4d2b41977751286- 1123false
- 2113false
- 3246true
- 4945false
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उत्तर : 3. "246"
व्याख्या :
Answer: C) 246 Explanation: A Committee of 5 persons is to be formed from 6 gentlemen and 4 ladies by taking. (i) 1 lady out of 4 and 4 gentlemen out of 6 (ii) 2 ladies out of 4 and 3 gentlemen out of 6 (iii) 3 ladies out of 4 and 2 gentlemen out of 6 (iv) 4 ladies out of 4 and 1 gentlemen out of 6 In case I the number of ways = C14×C46 = 4 x 15 = 60 In case II the number of ways = C24×C36 = 6 x 20 = 120 In case III the number of ways = C34×C26 = 4 x 15 = 60 In case IV the number of ways = C44×C16 = 1 x 6 = 6 Hence, the required number of ways = 60 + 120 + 60 + 6 = 246

