IIT JEE Practice Question and Answer
8Q: Which choice best describes the polarity of BrF5? 1837 05b5cc62ce4d2b4197774b902
5b5cc62ce4d2b4197774b902- 1nonpolar bonds / nonpolar moleculefalse
- 2nonpolar bonds / polar moleculefalse
- 3polar bonds / polar moleculetrue
- 4polar bonds / nonpolar moleculefalse
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Answer : 3. "polar bonds / polar molecule"
Explanation :
Answer: C) polar bonds / polar molecule Explanation:
Q: Compound interest on a certain sum of money at 20% per annum for 2 years is Rs.5995. What is the SI on the same money at 8% per annum for 6 years ? 1837 05b5cc6cae4d2b4197774e0a9
5b5cc6cae4d2b4197774e0a9- 1Rs. 5989false
- 2Rs. 6540true
- 3Rs. 7844false
- 4Rs. 6789false
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Answer : 2. "Rs. 6540"
Explanation :
Answer: B) Rs. 6540 Explanation: Given C.I = 5984, R = 20% , T = 2yrs C.I = P1+201002-1 5984 = => P = (5995x25)/11 P = Rs. 13625 Now S.I = PTR/100 SI = (13625 x 8 x 6)/100 = Rs. 6540
Q: Khushi bought the bangles of equal number of Rs. 34 per piece, Rs. 42 per piece and Rs. 6 per piece. She spends total Rs. 1722 on all types of bangles. How many bangles did she buy of each type ? 1836 05b5cc6c2e4d2b4197774dbd2
5b5cc6c2e4d2b4197774dbd2- 127false
- 213false
- 317false
- 421true
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Answer : 4. "21"
Explanation :
Answer: D) 21 Explanation: Let number of bangles kushi purchase of each type = x From the given data, 34x + 42x + 6x = 1722 x = 1722/82 = 21.
Q: Find the next number in the following number series? 410, 409, 413, 404, ? 1835 05b5cc662e4d2b4197774bea6
5b5cc662e4d2b4197774bea6- 1412false
- 2415false
- 3418false
- 4420true
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Answer : 4. "420"
Explanation :
Answer: D) 420 Explanation: The given number series 410, 409, 413, 404, ? , follows a pattern that 410 410 - 13 = 409409 + 22 = 413413 - 33 = 404404 + 42 = 420 Hence, the next number in the given series is 420.
Q: A jogger running at 9 km/hr along side a railway track is 260 m ahead of the engine of a 140 m long train running at 45 km/hr in the same direction. In how much time will the train pass the jogger ? 1835 05b5cc6e5e4d2b4197774ed29
5b5cc6e5e4d2b4197774ed29- 125 secfalse
- 240 sectrue
- 338 secfalse
- 432 secfalse
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Answer : 2. "40 sec"
Explanation :
Answer: B) 40 sec Explanation: Speed of train relative to jogger = 45 - 9 = 36 km/hr.= 36 x 5/18 = 10 m/sec. Distance to be covered = 260 + 140 = 400 m. Time taken = 400/10 = 40 sec.
Q: CTRL + ] is used for 1835 05b5cc6a0e4d2b4197774ca3d
5b5cc6a0e4d2b4197774ca3d- 1Re-dofalse
- 2Right align textfalse
- 3Increase in font sizetrue
- 4Expand or collapse the ribbonfalse
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Answer : 3. "Increase in font size"
Explanation :
Answer: C) Increase in font size Explanation: CTRL + ] is a computer shortcut and is used for Increase in font size. Shortcuts : Re-do ---- Ctrl + Y Right align text ---- Ctrl + R Expand or collapse the ribbon ---- Ctrl + F1
Q: 5 years ago, the mother's age was 3 times of her son's age. 5 years hence, the ratio between the ages of mother and the son becomes 11:5. Find the mother's present age? 1835 05b5cc611e4d2b4197774b67b
5b5cc611e4d2b4197774b67b- Show AnswerHide Answer
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Answer :
Explanation :
Let the present age's of mother be 'M' and that of her son be 'S'. According to the given data in the question, M - 5 = 3(S - 5) F - 3S = -10 ...............(1) Then given , M + 5 : S + 5 = 11 : 5 => 5M - 11S = 30 ..............(2) From (1) & (2), we get S = 20 Then by substituting S = 20 in (1) or (2), we get M = 50. Hence, the present age of mother is M = 50 years.
Q: The cotton gin was an important invention because 1835 05b5cc678e4d2b4197774c192
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Answer :
Explanation :
Cotton Gin was invented by Eli Whitney in 1793, which is used to separate cotton seeds from cotton fiber. Hence, it was an important invention because it dramatically reduced the amount of time it took to separate cotton seeds from cotton fiber.