IIT JEE Practice Question and Answer
8Q: What number should replace the question mark? 125, 138, 164, ?, 255 2438 05b5cc6a1e4d2b4197774cabd
5b5cc6a1e4d2b4197774cabd- 1189false
- 2197false
- 3200false
- 4203true
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Answer : 4. "203"
Explanation :
Answer: D) 203 Explanation: The given number series is 125, 138, 164, ?, 255 125 125 + 13x1 = 138 138 + 13x2 = 164 164 + 13x3 = 203 203 + 13x4 = 255 Hence, the missing number in the series is 203.
Q: Which of the following statements about Woodrow Wilson is true? 2437 05b5cc60de4d2b4197774b613
5b5cc60de4d2b4197774b613- 1He wanted to place strict government controls on corporations.true
- 2He overturned discriminatory laws against African Americans.false
- 3He advocated eliminating the income tax.false
- 4He opposed reforms to the banking system.false
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Answer : 1. "He wanted to place strict government controls on corporations."
Explanation :
Answer: A) He wanted to place strict government controls on corporations. Explanation: Woodrow Wilson was one of the major "Progressives" in American government and so 'He wanted to place strict government controls on corporations.'
Q: The top and bottom of a tower were seen to be at angles of depression 30° and 60° from the top of a hill of height 100 m. Find the height of the tower ? 2436 15b5cc72ce4d2b4197774f79c
5b5cc72ce4d2b4197774f79c- 142.2 mtsfalse
- 233.45 mtsfalse
- 366.6 mtstrue
- 458.78 mtsfalse
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Answer : 3. "66.6 mts"
Explanation :
Answer: C) 66.6 mts Explanation: From above diagramAC represents the hill and DE represents the tower Given that AC = 100 m angleXAD = angleADB = 30° (∵ AX || BD ) angleXAE = angleAEC = 60° (∵ AX || CE) Let DE = h Then, BC = DE = h, AB = (100-h) (∵ AC=100 and BC = h), BD = CE tan 60°=AC/CE => √3 = 100/CE =>CE = 100/√3 ----- (1) tan 30° = AB/BD => 1/√3 = 100−h/BD => BD = 100−h(√3)∵ BD = CE and Substitute the value of CE from equation 1 100/√3 = 100−h(√3) => h = 66.66 mts The height of the tower = 66.66 mts.
Q: Which one of the following began with the Dandi March ? 2435 05b5cc6cee4d2b4197774e256
5b5cc6cee4d2b4197774e256- 1Civil disobedience Movementtrue
- 2Quit India Movementfalse
- 3Non-Cooperation Movementfalse
- 4Home rule Movementfalse
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Answer : 1. "Civil disobedience Movement"
Explanation :
Answer: A) Civil disobedience Movement Explanation:
Q: A box contains 90 screws each of 100 gms and 100 bolts each of 150 gms. If the entire box weighs 35.5 kg, then the weight of the empty box is ? 2435 05b5cc731e4d2b4197774f7e2
5b5cc731e4d2b4197774f7e2- 110.5 kgsfalse
- 212 kgsfalse
- 39.6 kgsfalse
- 411.5 kgstrue
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Answer : 4. "11.5 kgs"
Explanation :
Answer: D) 11.5 kgs Explanation: Screws weight = 90x100 = 9000gmsbolts weight = 100 x 150 = 15000gmsweight = screws + bolts => 24000 gms =>24 kgGiven entire box weight = 35.5kgempty box = entire box weight - weight => 35.5kg - 24kg => 11.5kgso the empty box is 11.5kg.
Q: I jump when i walk and sit when i stand, who am I? 2435 05b5cc6a0e4d2b4197774ca65
5b5cc6a0e4d2b4197774ca65- Show AnswerHide Answer
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Answer :
Explanation :
Kangaroo.
Q: What is scientific name of "Cotton" ? 2434 05b5cc6d3e4d2b4197774e531
5b5cc6d3e4d2b4197774e531- 1Azadhirachta Indicafalse
- 2Phaseolies auicusfalse
- 3Gossypium Herbaceumtrue
- 4Ficus Benghalensisfalse
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Answer : 3. "Gossypium Herbaceum"
Explanation :
Answer: C) Gossypium Herbaceum Explanation:
Q: Which best summarizes the concept of natural selection? 2431 05b5cc62fe4d2b4197774b954
5b5cc62fe4d2b4197774b954- 1the fittest organisms survive and reproducetrue
- 2an organism will always adapt to its environmentfalse
- 3an organism will always mutate to survivefalse
- 4a mutation always makes a species fitterfalse
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Answer : 1. "the fittest organisms survive and reproduce"
Explanation :
Answer: A) the fittest organisms survive and reproduce Explanation: Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

