IIT JEE प्रश्न और उत्तर का अभ्यास करें

नवीनतमलोकप्रियमूल्यांकनपेज देखें 237 of 416कुल सवाल 3327 जॉइन Examsbook

प्र: The more you take the more you leave behind. What is it? 1939 0

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उत्तर :
व्याख्या :

Footsteps.  Yes, as you walk forward, you will leave the footstep behind you.

प्र: Which Color has the Longest Wavelength? 1097 0

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    Violet
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    Yellow
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    Red
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    White
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उत्तर : 3. "Red"
व्याख्या :

Answer: C) Red Explanation: The visible colors from Longest wavelength to Shortest wavelength are :: Red, Orange, Yellow, Green, Blue and Violet.                     Red > Orange > Yellow > Green > Blue > Violet.   1. Infrared radiation has a longer wavelength than visible Red light.   2. Ultraviolet radiation has a shorter wavelength than the visible violet light.    3. The white light is a mixture of the colors of the visible spectrum.

प्र: What is the Lithosphere made of? 1589 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: Is Osmosis Active or Passive? 1795 0

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उत्तर :
व्याख्या :

Osmosis is the process in which water molecules move from a region of higher water potential to a region of lower potential down a water potential gradient across a partially permeable membrane. It doen't requires any additional energy to do this work.  So, Osmosis is a Passive.   Active and passive transport processes are two ways molecules and other materials move in and out of cells and cross intracellular membranes. 1. Active transport is the movement of molecules or ions against a concentration gradient (from an area of lower to higher concentration), which does not ordinarily occur, so enzymes and energy are required. 2. Passive transport is the movement of molecules or ions from an area of higher to lower concentration. Passive transport occurs because of the entropy of the system, so additional energy isn't required for it to occur. 3. Active transport requires energy to proceed, while passive transport does not require the input of extra energy to occur.

प्र: Solid Carbon dioxide is known as 1782 0

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    Wet Ice
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    Dry Ice
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    Solid Ice
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    None
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उत्तर : 2. "Dry Ice"
व्याख्या :

Answer: B) Dry Ice Explanation: Dry ice or Cardice is the solid form of Carbon dioxide.   1. It has an advantage of lower temperature than the water ice and doesn't leave any residue.   2. The reason why it is called as Dry ice is because unlike the normal ice, it won't melt into liquid form. It directly evaporates into the air as gas. That is Solid to gas form passing through liquid state is a phenomenon called as Sublimation.   3. The primary use of dry ice is as cooling agent.

प्र: A motorboat goes 8 km an hour in still water, but takes thrice as much time in going the same distance against the current than going with the current. Then find the speed of the current? 2518 0

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    4 kmph
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    6 kmph
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    3 kmph
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    2 kmph
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उत्तर : 1. "4 kmph"
व्याख्या :

Answer: A) 4 kmph Explanation: Let the speed of current = 'C' km/hr   Given the speed of boat in still water = 6 kmph   Let 'd' kms be the distance it covers.   According to the given data,   Boat takes thrice as much time in going the same distance against the current than going with the current   i.e, d8 - C = 3 × d8 + C   ⇒ 24 - 3C = 8 + C⇒ 4C = 16⇒ C = 4 kmph   Hence, the speed of the current C = 4 kmph.

प्र: Jio is a big shot at reducing the cost of Internet access in India. The U.S., despite being the richest country in the world, lags far behind in terms of cost and penetration of Internet access. Cheap access to the Internet is an important step in bridging the access gap – access to good education, good healthcare, etc. But the market reaction to Jio is similar to the U.S. market’s reaction to firms announcing their intention to diversify. ( 1740 0

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    The final group of losers is the current shareholders of RIL. On announcement of Jio, the stock price of RIL fell. (
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    It shows that the market’s short-term reaction is usually proven correct in the long-run. (
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    On losing end, the first groups of losers are the shareholders of other telecom companies. (
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    The large amount of revenue the Government of India gets from auctioning off the nation’s natural resources is not necessarily a good thing because the Government does not have a stellar track record when it comes to spending the money. A large fraction of Government spending is wasted. (E) The second loser is the Government of India. The big money the Indian Government was raking in selling cellular bandwidth was actually coming from the pockets of the cellular consumers.  (F) The first obvious winners of this scheme are customers. (G) The second winner is Mr. Ambani; he can potentially make a lasting impact as the man who brought Internet to millions of Indians.   Question: Which of the following supports the decision of other companies opposing Reliance JIO Scheme?
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उत्तर : 4. "The large amount of revenue the Government of India gets from auctioning off the nation’s natural resources is not necessarily a good thing because the Government does not have a stellar track record when it comes to spending the money. A large fraction of Government spending is wasted. (E) The second loser is the Government of India. The big money the Indian Government was raking in selling cellular bandwidth was actually coming from the pockets of the cellular consumers.  (F) The first obvious winners of this scheme are customers. (G) The second winner is Mr. Ambani; he can potentially make a lasting impact as the man who brought Internet to millions of Indians.   Question: Which of the following supports the decision of other companies opposing Reliance JIO Scheme?"
व्याख्या :

Answer: D) Both C & E Explanation: As the arguments C and E states that other companies are on the losing end with this scheme, it is the only appropriate answer to this question.

प्र: Simplify the following and find the value of ?   13 of ? + 47 of 114 of 539 = 31% of 2000 1906 0

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    1134
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    1237
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    1187
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    1249
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उत्तर : 1. "1134"
व्याख्या :

Answer: A) 1134 Explanation: 13 x ? + 47 x 114 x 539 = 31100 x 2000? = 378 x 3? = 1134

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