IIT JEE Practice Question and Answer

Q: Which results from an increase in the greenhouse effect? 1109 0

  • 1
    Ocean acidification
    Correct
    Wrong
  • 2
    Smog pollution
    Correct
    Wrong
  • 3
    Ozone depletion
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: A greenhouse gas (GHG) is any gas in the atmosphere that absorbs and emits radiation in the thermal infrared range.   The increase in average global temperatures that results from an enhanced greenhouse effect. Effects of increased greenhouse gas emissions: Increases in the different greenhouse gases have other effects apart from global warming including ocean acidification, smog pollution, ozone depletion as well as changes to plant growth and nutrition levels.

Q: When was Judaism founded? 1438 0

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Answer :
Explanation :

Judaism is one of the oldest monotheistic religions and was founded over 3500 years ago in the Middle East.   Jews believe that God appointed the Jews to be his chosen people in order to set an example of holiness and ethical behaviour to the world.

Q: 3/8 as a decimal 1180 0

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    1.375
    Correct
    Wrong
  • 2
    2.375
    Correct
    Wrong
  • 3
    0.375
    Correct
    Wrong
  • 4
    3.75
    Correct
    Wrong
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Answer : 3. "0.375"
Explanation :

Answer: C) 0.375 Explanation: Expressing 3/8 as a decimal fraction: We can convert 3/8 into a decimal fraction by just dividing 3 by 8 or making 3 into 8 parts. Then, it is 3/8 = 0.375 as a decimal fraction.   Other Method:: 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 125)/(8 x 125) = 375/1000 = 0.375.

Q: How long is a giraffe tongue in feet 1373 0

  • 1
    1.6
    Correct
    Wrong
  • 2
    6
    Correct
    Wrong
  • 3
    18
    Correct
    Wrong
  • 4
    10
    Correct
    Wrong
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Answer : 1. "1.6"
Explanation :

Answer: A) 1.6 Explanation: A typical giraffe neck can stretch as long as six feet, the giraffe's tongue usually measures 18-20 inches long.   Why that much long: Giraffe's eat Acacia tree leaves. The acacia tree's tasty leaves are protected by very sharp thorns. The giraffe's long tongue allows it to reach the highest, tastiest leaves while avoiding the sharp thorns. Its tongue also features a thick, tough layer that protects it from being cut by the thorns. If a giraffe's tongue does get cut by a thorn, its extra-thick saliva has antiseptic properties that help it to heal quickly.

Q: Intermolecular forces in HCl are 1272 0

  • 1
    Hydrogen bonding
    Correct
    Wrong
  • 2
    Dipole-dipole
    Correct
    Wrong
  • 3
    Dispersion force
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Intermolecular forces : The forces of attraction present in between the molecules or atoms or compounds is termed as intermolecular forces. The molecule HCl is composed of hydrogen and chlorine atom. There is high difference in electronegativities therefore, it is polar in nature. The H end of HCl is permanently slightly positive charge. The Cl end of HCl has a permanent slight negative charge. the "H" in one molecule is attracted to the "Cl" in a neighbor. The intermolecular force is weak compared to a covalent bond. But this dipole-dipole interaction is one of the stronger intermolecular attractions. It also has hydrogen bonding and dispersion forces.  Dispersion forces are the weakest forces which are present in between all molecules or atoms.Hydrogen bonds are present in molecules having at least one H-A bond where A is the strong electronegative atom (mainly F, Cl and N).

Q: Which country imports the most metals? 1483 0

  • 1
    China
    Correct
    Wrong
  • 2
    Japan
    Correct
    Wrong
  • 3
    Africa
    Correct
    Wrong
  • 4
    Australia
    Correct
    Wrong
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Answer : 2. "Japan"
Explanation :

Answer: B) Japan Explanation:

Q: The 'P' in DPT stands for 1732 0

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    Pulmonary
    Correct
    Wrong
  • 2
    Pneumonia
    Correct
    Wrong
  • 3
    Pneumothorax
    Correct
    Wrong
  • 4
    Pertussis
    Correct
    Wrong
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Answer : 4. "Pertussis"
Explanation :

Answer: D) Pertussis Explanation: DPT refers to a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis, and tetanus.   Pertussis refers to whooping cough.

Q: The study of the weather is known as 1877 0

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    Weatherology
    Correct
    Wrong
  • 2
    Siesmology
    Correct
    Wrong
  • 3
    Meteorology
    Correct
    Wrong
  • 4
    Pulmology
    Correct
    Wrong
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Answer : 3. "Meteorology"
Explanation :

Answer: C) Meteorology Explanation: Meteorology is the study of weather and Earth's atmosphere. Climatology is another term used to describe the study of weather.   Studying the weather is not only useful for determining if you'll need an umbrella for the day. While forecasting is an important aspect of studying weather, understanding weather patterns provides valuable information about the status of the planet.

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