IIT JEE Practice Question and Answer
8Q: A person's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present ? 1652 05b5cc6dce4d2b4197774e983
5b5cc6dce4d2b4197774e983- 136 yrsfalse
- 238 yrsfalse
- 340 yrstrue
- 442 yrsfalse
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Answer : 3. "40 yrs"
Explanation :
Answer: C) 40 yrs Explanation: Let the mother's present age be x years. Then, the person's present age = 2/5 x years. (2x/5 + 8) = 1/2 (x + 8) 2(2x + 40) = 5(x + 8) => x = 40.
Q: With which Bank Google has tied up for its mobile payments app Tez? 1652 05b5cc6a6e4d2b4197774cdca
5b5cc6a6e4d2b4197774cdca- 1SBI Banktrue
- 2Axis Bankfalse
- 3HDFC Bankfalse
- 4PNB Bankfalse
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Answer : 1. "SBI Bank"
Explanation :
Answer: A) SBI Bank Explanation: Internet giant Google has tied up with State Bank of India (SBI) for its mobile payments app Tez. Through this partnership, Google Tez will allow users to create an SBI UPI Id - @oksbi and get access.
Q: The Gas used for Artificial Ripening of Green Fruit is 1652 05b5cc6b9e4d2b4197774d707
5b5cc6b9e4d2b4197774d707- 1Acetonefalse
- 2Di Carbonatefalse
- 3Ethylenetrue
- 4Ethyl Alcoholfalse
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Answer : 3. "Ethylene"
Explanation :
Answer: C) Ethylene Explanation: Ethylene is used for Artificial Ripening of Green Fruit. Calcium carbide is also used in some countries for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in its effects to the natural ripening agent, ethylene
Q: A take twice as much time as B or thrice as much time to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in ? 1651 05b5cc6eee4d2b4197774eee6
5b5cc6eee4d2b4197774eee6- 13 hrsfalse
- 26 hrstrue
- 37 hrsfalse
- 45 hrsfalse
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Answer : 2. "6 hrs"
Explanation :
Answer: B) 6 hrs Explanation: Suppose A, B and C take x, x/2 and x/3 respectively to finish the work. Then, (1/x + 2/x + 3/x) = 1/2 6/x = 1/2 => x = 12 So, B takes 6 hours to finish the work.
Q: The capacity of a water heater is measured in 1651 05b5cc69de4d2b4197774c888
5b5cc69de4d2b4197774c888- 1Gallonsfalse
- 2Litersfalse
- 3Metersfalse
- 4Both A & Btrue
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Answer : 4. "Both A & B"
Explanation :
Answer: D) Both A & B Explanation: The capacity of a water heater is measured in Gallons or Liters. In the USA, it is measured in Gallons and in India, we measure it in Liters. Hence, if the capacity of the water heater is 15 gallons or 15 liters, then it says that it can hold 15 gallons or 15 liters of water.
Q: Priya can do a work in 16 days. In how many days will the work be completed by Sai, if the efficiency of Sai is 60% more than that of Priya ? 1650 05b5cc6c7e4d2b4197774deaf
5b5cc6c7e4d2b4197774deaf- 18 daysfalse
- 212 daysfalse
- 314 daysfalse
- 410 daystrue
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Answer : 4. "10 days"
Explanation :
Answer: D) 10 days Explanation: Ratio of efficiencies of Priya and Sai is Sai : Priya = 160 : 100 = 8 : 5 Given Priya completes the work in 16 days Let number of days Sai completes the work be 'd' => 5×16 = 8×d d = 10 days. Therefore, number of days Sai completes the work is 10 days.
Q: Four girls Robin, Mandy, Stacy, Erica of four families Miller, Jacob, Flure and Clark prepare four salads using the fruits Apples, cherries, bananas, grapes .Each girls uses 3 fruits in her salad. No body have the same combination. 1) Robin not a Miller girl uses apples.2) Miller and Mandy uses apples and cherries. 3) Clark uses cherries and grapes but Flure uses only one of them.4) Erica is not Clark nor Flure. Question : Give all combinations of Girls with their family and salads ? 1650 05b5cc70ee4d2b4197774f341
5b5cc70ee4d2b4197774f341- Show AnswerHide Answer
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Answer :
Explanation :
Out of 4 fruits, any 3 are chosen by 4 families.So the combinations areApple - A Cherries - C Banana - B Grapes - G1) ACB2) ACG3) BCG4) GAB By 2nd condition, Miller family uses either i)ACB or ii)ACGNow we have Robin, Mandy and Miller who uses apples (ACB,ACG,GAB)while Miller and Mandy both uses A and C. That leaves GAB for Robin. By 3rd condition Flure uses either C or G. So if we leave out the terms containing both C and G, we are left with ACB and GAB Now, for the time being let's suppose Robin is not a Flure.So ACB is taken by Flure. So ACG has to be Miller and that leaves BCG to be Clark. So we get Robin - Jacob(GAB). By 4th and 2nd conditions Erica and Mandy belong to the first two. That leaves Stacy - Clark(BCG). By 2nd condition Mandy is not a Miller, so we get Mandy - Flure(ACB) and that leaves Erica - Miller(ACG).
Q: Which of the following became widespread during the 1980's? 1650 05b5cc62fe4d2b4197774b97e
5b5cc62fe4d2b4197774b97e- 1Internetfalse
- 2Radiofalse
- 3Cable televisiontrue
- 4All the abovefalse
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Answer : 3. "Cable television"
Explanation :
Answer: C) Cable television Explanation: Cable television or cable TV became widespread during the 1980's.

