IIT JEE Practice Question and Answer

Q: Digitized information can be used by computers. 1664 0

  • 1
    TRUE
    Correct
    Wrong
  • 2
    FALSE Answer & Explanation Answer:
    Correct
    Wrong
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Answer : 1. "TRUE"
Explanation :

Answer: A) TRUE Explanation: TRUE. The computers and electronic devices use digitized information which is easily understood by them.   Digitization is the process of converting analog signals or information of any form into a digital format that can be understood by computer systems or electronic devices. The term is used when converting information, like text, images or voices, and sounds, into binary code.

Q: A jogger running at 9 kmph alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 kmph in the same direction. In how much time will the train pass the jogger  ? 1664 0

  • 1
    10 sec
    Correct
    Wrong
  • 2
    48 sec
    Correct
    Wrong
  • 3
    36 sec
    Correct
    Wrong
  • 4
    56 sec
    Correct
    Wrong
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Answer : 3. "36 sec"
Explanation :

Answer: C) 36 sec Explanation: Given speed of jogger = 9 kmph Speed of train = 45 kmphAs they are in same direction, Relative speed = 45 - 9 = 36 kmph = 36x5/18 = 10 m/sDistance = 240 + 120 = 360 mts Time = distance/speed = 360/10 = 36 sec.

Q: What type of bone is a phalanx? 1663 0

  • 1
    Short bones
    Correct
    Wrong
  • 2
    Joints
    Correct
    Wrong
  • 3
    Long bones
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 3. "Long bones"
Explanation :

Answer: C) Long bones Explanation: The phalanges or a phalanx are/is digital bones in the hands and feet of most vertebrates. In primates, the thumbs and big toes have two phalanges while the other digits have three phalanges. The phalanges are classed as long bones.

Q: What goes up and down the stairs without moving? 1663 0

  • 1
    Umbrella
    Correct
    Wrong
  • 2
    Lift
    Correct
    Wrong
  • 3
    Stairs
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 3. "Stairs"
Explanation :

Answer: C) Stairs Explanation: Those are stairs which goes up and down without moving.

Q: Find the odd one out of the following words ? 1663 0

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    cruise
    Correct
    Wrong
  • 2
    crusade
    Correct
    Wrong
  • 3
    expedition
    Correct
    Wrong
  • 4
    campaign
    Correct
    Wrong
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Answer : 1. "cruise"
Explanation :

Answer: A) cruise Explanation: Cruise = a sea voyage for pleasure. All other words are related to ‘journey on land, sea with an aim’.

Q: Which of these molecules are polar? Check all that apply. 1663 0

  • 1
    SO2
    Correct
    Wrong
  • 2
    CH2Cl2
    Correct
    Wrong
  • 3
    PCl3
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation:    1) SO2                  2) CH2Cl2                3) PCl3 How to check the given molecules are polar or non polar : If the electronegativity of the two bonded atoms are different then the bond is polar. Although, some molecules contain polar bonds, the molecule may be non-polar. If the polarity of all the bonds present in the molecule are cancel each other then molecule is non-polar.   In the given options, SO2  is polar because the dipole moments on the O do not cancel. PCl3  is polar because the P-Cl bonds do not cancel out. CH2Cl2  polar because the C-Cl bonds do not cancel.   Hence, in brief, Polar molecules are molecules with net dipole due to the presence of partial positive and partial negative charge. For example, water is a polar molecule that has partial positive and partial negative charge on it. CO2 is a non polar compound.   Therefore, all the given options SO2, CH2Cl2 and PCl3 are Polar molecules.

Q: A gland below the bladder and surrounding the urethra? 1663 0

  • 1
    Prostate
    Correct
    Wrong
  • 2
    Vas deferens
    Correct
    Wrong
  • 3
    Seminal vesicle
    Correct
    Wrong
  • 4
    Bulbourethral
    Correct
    Wrong
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Answer : 1. "Prostate"
Explanation :

Answer: A) Prostate Explanation: The prostate gland is a walnut-sized structure that is located below the urinary bladder in front of the rectum. The prostate gland contributes additional fluid to the ejaculate. Prostate fluids also help to nourish the sperm. The urethra, which carries the ejaculate to be expelled during orgasm, runs through the center of the prostate gland.

Q: Microwave communication uses high-frequency. 1662 0

  • 1
    TRUE
    Correct
    Wrong
  • 2
    FALSE Answer & Explanation Answer:
    Correct
    Wrong
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Answer : 1. "TRUE"
Explanation :

Answer: A) TRUE Explanation: Microwaves are high-frequency signals in the 300 MHz to 300 GHz range. This is in contrast to radio signals, which are typically broadcast in all directions. Radio signals operate in the 3 Hz to 300 MHz range. Microwave signals are used for both satellite and ground-based communications.

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