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By Everyday Science Mcqs No Comments

When a person enters a dark room from bright light he is not able to see clearly for a little while because the?

A. Eye is unable to adjust itself immediately
B. Retina becomes insensitive momentarily
C. Iris is unable to dilate the pupil immediately
D. Distance between the lens and retina take time to adjust

 

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The amount of light entering the eye through pupil is controlled by iris. But this adjustment takes some time. Our eyes cannot see everything clearly when we enter a dark room from a bright light. The reason for this is that in bright light the size of pupil of our eye is small. When we enter the dark room, due to small size of pupil, very little light enters our eyes. But after some time, the pupil expands and we become able to see things as more light enter our eyes.

Related Mcqs:

  1. When a ray of sunlight enters a dark room , its straight path become visible because of dust particles hanging in the air. It is because light is _________?

    A. Visible
    B. Transparent
    C. Invisible
    D. opaque
    E. None of these

  2. It is possible to recognize a person in the dark by simply hearing his unique voice . It is because of the_______?

    A. pitch
    B. Frequency
    C. Time period
    D. Quality
    E. None of these

  3. The owl can see most clearly in total darkness because:

    A. it has squint eyes
    B. it has light bulbs in its eyes provided by nature
    C. it produces infrasonic sounds
    D. it has large eyes with orbs directed forward, giving it binocular sight

    Submitted by: Abid Hussain

  4. Bats can also fly in dark because they are capable of taking the help of _________?

    A. Ultraviolet Waves
    B. Ultrasonic Waves
    C. Electromagnetic Waves
    D. Special Retina

  5. The large dark patches on the Moon’s surface are known as___________?

    A. Dark matter
    B. Maria, or seas, even though there is no water on the Moon
    C. Maria, or seas, because they are filled with water
    D. Moon spots

    Submitted by: Mansoor Ul Haque

  6. The ability of the Eye to see in the dark, is due to the production of a purple pigment known as________?

    A. Carotene
    B. Rhodopsin
    C. Iodopsin
    D. Retinene

    Submitted by: Malik Asghar Hussain

  7. What makes dark matter invisible to telescope?

    A. Dark matter interacts with electromagnetic force for very short duration
    B. Dark matter does not interact with electrostatic force
    C. Dark matter does not interact with electromagnetic force
    D. None of the above

    Submitted by: Muhammad Abdullah

  8. How dark matter is detected?

    A. Dark matter is detected through its absorption effects
    B. Dark matter is detected through its gravitational effects on visible matter
    C. Dark matter is detected through its absorption and gravitational effects
    D. Dark matter cannot be detected

    Submitted by: Muhammad Abdullah

  9. Which region of the Moon is known as Dark side?

    A. Equator
    B. South Pole
    C. North Pole
    D. None of these

    Submitted by: Areesha Khan

  10. Which one of the following gases is readily soluble in water at room temperature?

    A. Chlorine
    B. Nitrogen
    C. Ammonia
    D. Carbon dioxide

    Submitted by: ABDUL HAYEE

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The correct answer to the question: "When a person enters a dark room from bright light he is not able to see clearly for a little while because the?" is "Iris is unable to dilate the pupil immediately".

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