IIT JEE Practice Question and Answer
8Q: Under which conditions are gases most soluble in water? 2340 05b5cc619e4d2b4197774b6fb
5b5cc619e4d2b4197774b6fb- 1low pressure and low temperaturefalse
- 2low pressure and high temperaturefalse
- 3high pressure and low temperaturetrue
- 4high pressure and high temperaturefalse
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Answer : 3. "high pressure and low temperature"
Explanation :
Answer: C) high pressure and low temperature Explanation: Henry's Law tells that the solubility of a gas is directly proportional to the partial pressure of the gas above the solvent. Hence under high pressure, more gas is dissolved. Also that Henry's Law involves a constant which is temperature-dependent. Under high temperatures, less gas is dissolved whereas under low temperatures, more gas is dissolved. For Example :: You can think of a can of soda. The contents are under pressure and if you shake the can before opening, the soda fizzes out all over as you open it. So the higher the pressure, the more gas or more CO2 can be dissolved in the drink. Eliminate choices 1 and 2. Now focus on the temperature. Soda goes flat (loses carbonation or gas) as it warms up. Soda is usually served cold because more of the carbonation or CO2 stays in the drink when the soda is cold. Hence, in high pressure and low temperature conditions gases are most soluble in water.
Q: What has a foot but no legs? 2339 05b5cc639e4d2b4197774ba7c
5b5cc639e4d2b4197774ba7c- Show AnswerHide Answer
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Answer :
Explanation :
A measuring device. Measuring devices have feet on them to measure distance.
Q: Which atomic power station in India is built completely indigenously? 2339 05b5cc6a2e4d2b4197774cbbd
5b5cc6a2e4d2b4197774cbbd- 1Rawat Bhatafalse
- 2Kalpakkamtrue
- 3Taraporefalse
- 4Narorafalse
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Answer : 2. "Kalpakkam"
Explanation :
Answer: B) Kalpakkam Explanation: Madras Atomic Power Station (MAPS) located at Kalpakkam about 80 kilometers (50 mi) south of Chennai, India, is a comprehensive nuclear power production, fuel reprocessing, and waste treatment facility that includes plutonium fuel fabrication for fast breeder reactors (FBRs) is the only atomic power station in India that was built completely indigenously.
Q: When 0.46 is written in simplest form, the sum of the numerator and the denominator is ? 2337 05b5cc6dee4d2b4197774ea9e
5b5cc6dee4d2b4197774ea9e- 169false
- 273true
- 396false
- 441false
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Answer : 2. "73"
Explanation :
Answer: B) 73 Explanation: 0.46 = 46/100 = 23/50. Sum of the numerator and denominator is 23 + 50 = 73
Q: Each of the following series of statements is followed by four sets. Identify the set that is logically consistent.(a) The gap between the average starting salaries of teachers and those of other professionals has shrunk in recent years.(b) The average age of first year teachers is same as it was in 1975.(c) Starting teachers are no longer underpaid.(d) The extent of a persons formal education is a measure by which to determine his level of salary.(e) Over the last few years, the average starting salaries of other professionals have increased by 20% 2334 05b5cc731e4d2b4197774f7b0
5b5cc731e4d2b4197774f7b0- 1e,b,dfalse
- 2e,d,bfalse
- 3a,c,bfalse
- 4a,e,ctrue
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Answer : 4. "a,e,c"
Explanation :
Answer: D) a,e,c Explanation: The statements a,e,c are logically sequenced.
Q: Arun is a cashew merchant in Telangana. He has cashews in sealed wooden boxes of 10kg each. The price of the cashew increases by Rs.20 per kg for every year, but at the same time, 10% of the cashews are eaten by rodents every year. If the price of a 1 kg of fresh cashew is Rs.120, what is the change in his profits if he sells a sealed box after one year of storage, rather than selling it fresh ? (In Rs.) 2333 05b5cc728e4d2b4197774f719
5b5cc728e4d2b4197774f719- 1Rs. 60true
- 2Rs. 54false
- 3Rs. 80false
- 4Rs. 75false
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Answer : 1. "Rs. 60"
Explanation :
Answer: A) Rs. 60 Explanation: Price of 1kg fresh cashew = Rs.120Therefore, price of 10kg = Rs.120 x 10 = Rs.1200 10% of 10kg which eaten by rodents = 10 x 10/100 = 1kg. So, End of Year he had 10kg - 1kg = 9kg So, he sells that 9kg with Rs.20 per kg profit = 9 x 140 = 1260. He buy 10kg wooden box with cashew for Rs.1200 and sell that for Rs. 1260 So, profit = 1260 - 1200 = Rs.60 more money he get.
Q: Selling an article at a profit of 20%, Aman gets Rs. 400 more than selling at a loss of 20%. The cost price of the article is ? 2331 05b5cc6c2e4d2b4197774dbeb
5b5cc6c2e4d2b4197774dbeb- 1Rs.1000true
- 2Rs. 1020false
- 3Rs.1210false
- 4Rs.1140false
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Answer : 1. "Rs.1000"
Explanation :
Answer: A) Rs.1000 Explanation: Cost price of the article is given by = 400x100/(20+20) = Rs.1000
Q: Lux is the SI unit of 2329 05b5cc69fe4d2b4197774ca0a
5b5cc69fe4d2b4197774ca0a- 1luminous fluxfalse
- 2luminous efficiencyfalse
- 3intensity of illuminationtrue
- 4luminous intensityfalse
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Answer : 3. "intensity of illumination"
Explanation :
Answer: C) intensity of illumination Explanation: The lux (lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square meter.