IIT JEE Practice Question and Answer
8Q: Where are Enzymes found? 1078 05b5cc6abe4d2b4197774cff7
5b5cc6abe4d2b4197774cff7- 1foodfalse
- 2human bodytrue
- 3medicinesfalse
- 4nonefalse
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Answer : 2. "human body"
Explanation :
Answer: B) human body Explanation: Enzymes play an essential role in each living cell of our body. Enzymes are globular proteins that control biological reactions. These are of two types. 1. Intracellular enzymes 2. Extracellular enzymes Intracellular enzymes are found inside the cell. Extracellular enzymes act outside the cell. Enzymes are produced by exocrine glands. Digestive enzymes of diverse specificities are secreted by the salivary glands, stomach, pancreas, and the small intestine.
Q: Two parallel chords on the same side of the centre of a circle are 5 cm apart. If the chords are 20 and 28 cm long, what is the radius of the circle? 1077 05b5cc73ae4d2b4197774f8f7
5b5cc73ae4d2b4197774f8f7- 114.69 cmfalse
- 215.69 cmtrue
- 318.65 cmfalse
- 416.42 cmfalse
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Answer : 2. "15.69 cm"
Explanation :
Answer: B) 15.69 cm Explanation: Draw the two chords as shown in the figure. Let O be the center of the circle. Draw OC perpendicular to both chords. That divides the two chords in half.So CD = 10 and AB = 14. Draw radii OA and OD, both equal to radius r.We are given that BC = 5, the distance between the two chords. LetOB = x. We use the Pythagorean theorem on right triangle ABO AO² = AB² + OB² r² = 14² + x² We use the Pythagorean theorem on right triangle DCO DO² = CD² + OC² We see that OC = OB+BC = x+5, so r² = 10² + (x+5)² So we have a system of two equations: r² = 14² + x² r² = 10² + (x+5)² Since both left sides equal r², set the right sidesequal to each other. 14² + x² = 10² + (x+5)² 196 + x² = 100 + x² + 10x + 25 196 = 125 + 10x 71 = 10x 7.1 = x r² = 14² + x² r² = 196 + (7.1)² r² = 196 + 50.41 r² = 246.41 r = √246.41 r = 15.69745202 cm
Q: Why is burning coal a major source of pollution? 1077 05b5cc662e4d2b4197774be69
5b5cc662e4d2b4197774be69- Show Answer
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Answer :
Explanation :
Coal is chemically complex fuel. Whenever it is burned, gases are given off and particles of ash, called "fly ash," are released. Release of sulfur from burning into the air. The sulfur in coal combines with oxygen to form sulfur dioxide, which can be a major source of air pollution if emitted in large enough quantities. This stuff comes back as acid rain when it attaches itself to a raindrop. Today, many of the effects of coal burning have been reduced significantly or eliminated. This is super-nasty and is only stopped by buying low-sulfur coal from Montana or Wyoming. The eastern power plants have to pay to move the coal from out west and this increases the price of power production.
Q: Which international Airport Ltd has bagged the National Award for 'Excellence' in Energy Management ? 1076 05b5cc6c7e4d2b4197774decd
5b5cc6c7e4d2b4197774decd- 1New Delhifalse
- 2Lucknowfalse
- 3Hyderabadtrue
- 4Mumbaifalse
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Answer : 3. "Hyderabad"
Explanation :
Answer: C) Hyderabad Explanation:
Q: What is the theme of 2017 World Migratory Bird Day ? 1076 05b5cc6cce4d2b4197774e124
5b5cc6cce4d2b4197774e124- 1Their future is our future – a healthy planet for migratory birds and peopletrue
- 2Networking for migratory birdsfalse
- 3Energy: make it bird friendlyfalse
- 4Destination flyways: Migratory bird and Tourismfalse
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Answer : 1. "Their future is our future – a healthy planet for migratory birds and people"
Explanation :
Answer: A) Their future is our future – a healthy planet for migratory birds and people Explanation: World Migratory Bird Day (WMBD) was initiated in 2006 and is an annual awareness-raising campaign highlighting the need for the conservation of migratory birds and their habitats. It has a global outreach and is an effective tool to help raise global awareness of the threats faced by migratory birds, their ecological importance, and the need for international cooperation to conserve them. Day for World Migratory Bird Day celebrations is 10 May.
Q: Who has sworn in as 45th Chief Justice of India ? 1075 05b5cc6c9e4d2b4197774df8d
5b5cc6c9e4d2b4197774df8d- 1Dipak Misratrue
- 2J S Kheharfalse
- 3T. S. Thakurfalse
- 4Ranganath Misrafalse
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Answer : 1. "Dipak Misra"
Explanation :
Answer: A) Dipak Misra Explanation:
Q: Nipah virus outbreak in Bangladesh in the year 1075 05b5cc670e4d2b4197774c02a
5b5cc670e4d2b4197774c02a- 12001true
- 22006false
- 32012false
- 42015false
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Answer : 1. "2001"
Explanation :
Answer: A) 2001 Explanation: The first identification of Nipah virus as a cause of an outbreak of encephalitis was reported in 2001 in Meherpur district of Bangladesh. Since, then Outbreaks of the deadly Nipah virus has been recorded almost every year in selected districts of Bangladesh. Drinking raw date palm sap and contact with a case were identified as the major risk factors for acquiring the disease.
Q: Name the two Indian companies that have been named in the list of world's most ethical companies by American think tank Ethisphere Institute. 1075 05b5cc715e4d2b4197774f440
5b5cc715e4d2b4197774f440- 1Dabur and Tatafalse
- 2Mahindra and Tatafalse
- 3Patanjali and Daburfalse
- 4Tata Steel and Wiprotrue
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Answer : 4. "Tata Steel and Wipro"
Explanation :
Answer: D) Tata Steel and Wipro Explanation: Two Indian companies, Tata SteelBSE and Wipro have been named in the list of world’s most ethical companies by American think tank Ethisphere Institute. Ethisphere honors those companies who recognize their role in society to influence and drive positive change in the business community and organizations around the world. In 2017, 124 honorees were spanning five continents, 19 countries, and 52 industry sectors. Wipro is one of the two information technology companies named in the list, the other being Xerox Corporation.