IIT JEE Practice Question and Answer
8Q: In what ratio must a merchant mix two varieties of oils worth Rs. 60/kg and Rs. 65/kg, so that by selling the mixture at Rs. 68.20/kg, he may gain 10% ? 1635 05b5cc6c6e4d2b4197774de5e
5b5cc6c6e4d2b4197774de5e- 12:3false
- 24:3false
- 33:4false
- 43:2true
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 4. "3:2"
Explanation :
Answer: D) 3:2 Explanation: Let he mixes the oils in the ratio = x : y Then, the cost price of the oils = 60x + 65y Given selling price = Rs. 68.20 => Selling price = 68.20(x+y) Given profit = 10% = SP - CP => 10/100 (60x + 65y) = 68.20(x+y)-(60x + 65y) => 6x + 6.5y = 8.20x + 3.20y =>2.2x = 3.3y => x : y = 3 : 2
Q: A train covered k km at 40 kmph and another 2k km at 20 kmph. Find the average speed of the train in covering the entire 3k km ? 1635 05b5cc6dce4d2b4197774e965
5b5cc6dce4d2b4197774e965- 128 kmphfalse
- 224 kmphtrue
- 326 kmphfalse
- 432 kmphfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "24 kmph"
Explanation :
Answer: B) 24 kmph Explanation: Total time taken = k/40 + 2k/20 hours = 5k/40 = k/8 hours Average speed = 3k/(k/8) = 24 kmph.
Q: If a solid sphere of radius 10 cms is moulded into 8 spherical solid balls of equal radius, then surface area of each ball (in sq.cm) is ? 1635 05b5cc6ebe4d2b4197774ee69
5b5cc6ebe4d2b4197774ee69- 1100 πtrue
- 2101/πfalse
- 399 π/12false
- 454/13πfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "100 π"
Explanation :
Answer: A) 100 π Explanation: 4/3 π x 10 x 10 x 10 = 8 x 4/3 π x r x r x rr = 54π x 5 x 5 = 100π
Q: Which law relates to the ideal gas law? 1635 05b5cc683e4d2b4197774c2ea
5b5cc683e4d2b4197774c2ea- 1P1T1 = P2T2false
- 2P1/V1 = P2/V2false
- 3P1V1 = P2V2true
- 4T1/V1 = T2/V2false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "P1V1 = P2V2"
Explanation :
Answer: C) P1V1 = P2V2 Explanation: Ideal Gas Law :: The Combined gas law or General Gas Equation is obtained by combining Boyle's Law, Charles' Law, and Gay-Lussac's Law. It shows the relationship between the pressure, volume, and temperature for a fixed mass (quantity) of gas: P1V1T1 = P2V2T2 Hence, the Boyle's law P1V1 = P2T2, relates to ideal gas equation.
Q: What is the capital of Bhutan ? 1634 05b5cc6c9e4d2b4197774dfa1
5b5cc6c9e4d2b4197774dfa1- 1Dhakafalse
- 2Thimphutrue
- 3Tripolifalse
- 4Tokyofalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "Thimphu"
Explanation :
Answer: B) Thimphu Explanation:
Q: Maximum fixation of solar energy is done by 1634 05b5cc65ee4d2b4197774be1b
5b5cc65ee4d2b4197774be1b- 1Fungifalse
- 2Protozoafalse
- 3Bacteriafalse
- 4Green plantstrue
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 4. "Green plants"
Explanation :
Answer: D) Green plants Explanation:
Q: India Ratings has lowered India's growth forecast for the current fiscal to ________ from 7.4 per cent. 1634 05b5cc6c2e4d2b4197774dc13
5b5cc6c2e4d2b4197774dc13- 16.3 per centfalse
- 26.6 per centfalse
- 36.7 per centtrue
- 46.4 per centfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "6.7 per cent"
Explanation :
Answer: C) 6.7 per cent Explanation:
Q: Currency of Peru is 1633 05b5cc67be4d2b4197774c1e5
5b5cc67be4d2b4197774c1e5- 1Chilean Pesofalse
- 2Eurofalse
- 3Soltrue
- 4Dollarfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "Sol"
Explanation :
Answer: C) Sol Explanation: Peru is a country in South America. Lima is the capital city of Peru. Sol is the currency of Peru.