IIT JEE Practice Question and Answer
8Q: How fast do satellites orbit the earth? 2023 05b5cc6a2e4d2b4197774cbad
5b5cc6a2e4d2b4197774cbad- 128,000 kmphtrue
- 226,000 kmphfalse
- 317,500 kmphfalse
- 422,500 kmphfalse
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Answer : 1. "28,000 kmph"
Explanation :
Answer: A) 28,000 kmph Explanation: Satellites orbit the earth at a speed of 28,000 kmph. Satellites that are further away actually travel slower. The International Space Station has a Low Earth Orbit, about 400 kilometers (250 miles) above the earth's surface. Objects orbiting at that altitude travel about 28,000 kilometers per hour (17,500 miles per hour).
Q: The ratio of speeds of a car, a train and a bus is 5:9:4. The average speed of the car, the bus and the train is 72 km/hr together. What is the average speed of the car and the train together ? 2023 05b5cc736e4d2b4197774f83c
5b5cc736e4d2b4197774f83c- 184 km/hrtrue
- 296 km/hrfalse
- 372 km/hrfalse
- 460 km/hrfalse
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Answer : 1. "84 km/hr"
Explanation :
Answer: A) 84 km/hr Explanation: Let the speeds of the car, train and bus be 5x, 9x and 4x km/hr respectively.Average speed = 5x + 9x + 4x/3 = 18x /3 = 6x km/hr.Also, 6x = 72 => x = 12 km/hrTherefore, the average speed of the car and train together is = 5x+9x2= 7x = 7 x 12 = 84 km/hr.
Q: On a school’s Annual day sweets were to be equally distributed amongst 112 children. But on that particular day, 32 children were absent. Thus the remaining children got 6 extra sweets. How many sweets was each child originally supposed to get ? 2023 05b5cc741e4d2b4197774f9a4
5b5cc741e4d2b4197774f9a4- 114false
- 216false
- 312false
- 415true
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Answer : 4. "15"
Explanation :
Answer: D) 15 Explanation: Let 'K' be the total number of sweets.Given total number of students = 112If sweets are distributed among 112 children,Let number of sweets each student gets = 'L' => K/112 = L ....(1)But on that day students absent = 32 => remaining = 112 - 32 = 80Then, each student gets '6' sweets extra. => K/80 = L + 6 ....(2)from (1) K = 112L substitute in (2), we get112L = 80L + 48032L = 480L = 15 Therefore, 15 sweets were each student originally supposed to get.
Q: Who has been appointed as the deputy director-general of World Health Organization (WHO) ? 2023 05b5cc6c2e4d2b4197774dbc8
5b5cc6c2e4d2b4197774dbc8- 1Dr. Soumya Swaminathantrue
- 2Rajat Nandanfalse
- 3prof. Dr. Vikash Jhafalse
- 4Sunil Narayanfalse
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Answer : 1. "Dr. Soumya Swaminathan"
Explanation :
Answer: A) Dr. Soumya Swaminathan Explanation: The World Health Organization is a specialized agency of the United Nations that is concerned with international public health. It was established on 7 April 1948, Headquartered in Geneva, Switzerland. Dr Soumya Swaminathan has been appointed the deputy director general for programmes (DDP) of World Health Organisation (WHO). She also holds a key position as secretary in the department of health research, ministry of health and family welfare.
Q: Peacock : India :: Bear : ? 2023 05b5cc699e4d2b4197774c71f
5b5cc699e4d2b4197774c71f- 1Englandfalse
- 2Americafalse
- 3Russiatrue
- 4Africafalse
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Answer : 3. "Russia"
Explanation :
Answer: C) Russia Explanation: Here the relation between the given words is that the first word is the National animal of the second word. As Peacock is the national bird of India, similarly Bear is the national animal of Russia. Hence, Peacock : India :: Bear : Russia.
Q: Which of the following is malleable? 2022 05b5cc6a4e4d2b4197774cc55
5b5cc6a4e4d2b4197774cc55- 1Icefalse
- 2Goldtrue
- 3Stonefalse
- 4Potteryfalse
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Answer : 2. "Gold"
Explanation :
Answer: B) Gold Explanation: Here in the given options, Gold is a malleable substance. Malleable substance means a metal or a material able to be hammered or pressed into shape without breaking or cracking. i.e, tensile.
Q: The first stage in the formation of coal is 2022 15b5cc6a6e4d2b4197774cd91
5b5cc6a6e4d2b4197774cd91- 1Lignitefalse
- 2Bituminousfalse
- 3Anthracitefalse
- 4Peattrue
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Answer : 4. "Peat"
Explanation :
Answer: D) Peat Explanation: The first of the four stages of coal formation is lignite coal. There are four stages of coal formation: 1. Peat, 2. Lignite, 3. Bituminous and 4. Anthracite. The bacteria has removed a large portion of the other constituents of the plant matter and left around 25 to 34 percent.
Q: Express 3/8 and 1/10 as a Decimals? 2021 05b5cc6b3e4d2b4197774d437
5b5cc6b3e4d2b4197774d437- 11.375 & 1false
- 20.375 & 1false
- 313.75 & 1.1false
- 40.375 & 0.1true
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Answer : 4. "0.375 & 0.1"
Explanation :
Answer: D) 0.375 & 0.1 Explanation: 3/8 as a Decimal : In this we should convert the denominator into 10, 100, 1000, 10000, 100000,... to make it simple. Now to make 8 into 1000, we multiply numerator and denominator with 125 => 3 x 1258 x 125 = 3751000 = 0.375 1/10 as a Decimal : 1 divided into 10 parts of each 0.1. Therefore, 3/8 = 0.375 and 1/10 = 0.1 in decimals.

