IIT JEE Practice Question and Answer
8Q: How many three digit numbers 'abc' are formed where two of the three digits are same ? 1719 05b5cc701e4d2b4197774f1b7
5b5cc701e4d2b4197774f1b7- 1252false
- 2648false
- 3243true
- 4900false
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Answer : 3. "243"
Explanation :
Answer: C) 243 Explanation: Digits are 0,1,2,3,4,5,6,7,8,9. So no. of digits are 10 First all possible case => 9(0 excluded) x 10 x 10 = 900 Second no repetition allowed =>9 x 9 x 8 = 648 Third all digits are same => 9 (111,222,333,444,555,666,777,888,999) Three digit numbers where two of the three digits are same = 900 - 648 - 9 = 243 ;
Q: ______ is the first state to have Logo for Vehicles Driven by person with Hearing Impairment ? 1718 05b5cc6dfe4d2b4197774eb16
5b5cc6dfe4d2b4197774eb16- 1Telanganatrue
- 2Rajasthanfalse
- 3Gujaratfalse
- 4Haryanafalse
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Answer : 1. "Telangana"
Explanation :
Answer: A) Telangana Explanation: Telangana has introduced a logo for identifying vehicles driven by persons with hearing impairment and has become the first state in the country to do so. The logo was designed by city-based graphic designer Manikanta Annapragada who was the first person to obtain a driving licence under the ‘hearing impaired’ category in the country. The logo consists of a hearing impaired mark along with text saying, “Driver is deaf — Please watch out”.
Q: Which method of expressing direction is indicated in the illustration? 1718 05b5cc633e4d2b4197774b9dc
5b5cc633e4d2b4197774b9dc- 1Sectionfalse
- 2Interjuctionfalse
- 3Intersectiontrue
- 4None of the abovefalse
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Answer : 3. "Intersection"
Explanation :
Answer: C) Intersection Explanation:
Q: Two pipes A and B can separately fill a cistern in 60 min and 75 min respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 min. In how much time, the third pipe alone can empty the cistern ? 1718 05b5cc6e7e4d2b4197774edb5
5b5cc6e7e4d2b4197774edb5- 185 minfalse
- 295 minfalse
- 3105 minfalse
- 4100 mintrue
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Answer : 4. "100 min"
Explanation :
Answer: D) 100 min Explanation: Work done by the third pipe in 1 min = 1/50 - (1/60 + 1/75) = - 1/100.[-ve sign means emptying] The third pipe alone can empty the cistern in 100 min.
Q: In a joint family, there are 24 members whose age is decreased by 4 months, when one girl aged 24 years is replaced by a new boy. Find the age of the new boy ? 1716 05b5cc6c5e4d2b4197774dd73
5b5cc6c5e4d2b4197774dd73- 118 yearsfalse
- 212 yearsfalse
- 315 yearsfalse
- 416 yearstrue
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Answer : 4. "16 years"
Explanation :
Answer: D) 16 years Explanation: Age of new boy = (Age of moved girl) – (Number of family members × Decreased in average) = 24 – 24×4/12 = 24 – 8 = 16 years.
Q: Select a figure from the four alternatives that would complete the Figure Matrix. (1) (2) (3) (4) 1716 05b5cc76de4d2b4197774fef4
5b5cc76de4d2b4197774fef4- 14true
- 23false
- 32false
- 41false
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Answer : 1. "4"
Explanation :
Answer: A) 4 Explanation: Similar small figures are increasing by one in each of the bigger figure.
Q: The reserves of a commercial bank consist of 1716 05b5cc639e4d2b4197774bab6
5b5cc639e4d2b4197774bab6- 1the bank's net worthfalse
- 2the amount of money market funds it holdsfalse
- 3government securities that the bank holdsfalse
- 4deposits at the Federal Reserve Bank and vault cashtrue
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Answer : 4. "deposits at the Federal Reserve Bank and vault cash"
Explanation :
Answer: D) deposits at the Federal Reserve Bank and vault cash Explanation:
Q: Which of the following elements is a metal? 1716 05b5cc678e4d2b4197774c188
5b5cc678e4d2b4197774c188- 1Sefalse
- 2Ifalse
- 3Zntrue
- 4Sfalse
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Answer : 3. "Zn"
Explanation :
Answer: C) Zn Explanation: In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances. Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc. Here Se - Selenium is an element but is not a metal, S - Sulphur is not a metal and I - Iodine is also not a metal. Hence, Zn - Zinc is the only metal in the given options.

