image

    Have a query? Ask a Tutor!!

    Access to best educators and exclusive paper discussions

    Can’t find what you’re looking for?

    Our tutors are from top schools around the world, and they are waiting for you 24/7, anytime, anywhere.

    • Homework- One to One Solutions
    • Understand concepts to solve better
    • Get your doubts solved instantly
    Physics
    Grade-10
    Easy

    Question

    Planets can be considered as _____ sources of light.

    1. Point-sized 
    2. Extended
    3. Yellow
    4. None of the above

    Hint:

    Point-sized = It is that source of light which forms only the umbra region on the screen of the shadowed object

    The correct answer is: Extended

      Point-sized = It is that source of light which forms only the umbra region on the screen of the shadowed object
      Examples: Light from a distant star seen through a small telescope. Light passing through a pinhole or other small aperture, viewed from a distance much greater than the size of the hole. Light from a street light in a large-scale study of light pollution or street illumination.
      Planets can be considered as _Point-sized ____ sources of light.

      Related Questions to study

      Grade-10
      Physics

      When the incandescent bulbs are seen through a turbulent stream of hot air rising above a fire, they appear to be flickering. Why?

      1. The refractive index of the air above the fire is not stationary
      2. The temperature of the air above the fire is not stationary
      3. The physical conditions of the air above the fire are not stationary
      4. All of the above

      When the incandescent bulbs are seen through a turbulent stream of hot air rising above a fire, they appear to be flickering. Why?

      PhysicsGrade-10
      1. The refractive index of the air above the fire is not stationary
      2. The temperature of the air above the fire is not stationary
      3. The physical conditions of the air above the fire are not stationary
      4. All of the above
      Grade-10
      Physics

      The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the highest refractive index.

      1. 24
      2. 18
      3. 47
      4. 35

      The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the highest refractive index.

      PhysicsGrade-10
      1. 24
      2. 18
      3. 47
      4. 35
      Grade-10
      Physics

      Light from air at a temperature of 37 degrees Celsius enters a layer of the atmosphere at 29 degrees Celsius. The light ray ______ on entering the latter.

      1. Bends away from the normal line
      2. Bends towards the normal line
      3. Bends to align itself to the normal line
      4. Does not bend at all

      Light from air at a temperature of 37 degrees Celsius enters a layer of the atmosphere at 29 degrees Celsius. The light ray ______ on entering the latter.

      PhysicsGrade-10
      1. Bends away from the normal line
      2. Bends towards the normal line
      3. Bends to align itself to the normal line
      4. Does not bend at all
      parallel
      Grade-10
      Physics

      The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the lowest refractive index.

      1. 24
      2. 18
      3. 47
      4. 35

      The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the lowest refractive index.

      PhysicsGrade-10
      1. 24
      2. 18
      3. 47
      4. 35
      Grade-10
      Physics

      When starlight enters the Earth’s atmosphere, it bends _____.

      1. Towards the normal line
      2. Away from the normal line
      3. Along the normal line
      4. Does not bend

      When starlight enters the Earth’s atmosphere, it bends _____.

      PhysicsGrade-10
      1. Towards the normal line
      2. Away from the normal line
      3. Along the normal line
      4. Does not bend
      Grade-10
      Physics

      Which of the following is an effect of atmospheric refraction?

      1. Formation of a rainbow
      2. Colors of various objects
      3. Objects being visible to us
      4. Twinkling of stars

      Which of the following is an effect of atmospheric refraction?

      PhysicsGrade-10
      1. Formation of a rainbow
      2. Colors of various objects
      3. Objects being visible to us
      4. Twinkling of stars
      parallel
      Grade-10
      Physics

      Due to atmospheric refraction the duration of a normal day _____ by____ minutes.

      1. Decreases, 2
      2. Increases, 2
      3. Decreases, 4
      4. Increases, 4

      Due to atmospheric refraction the duration of a normal day _____ by____ minutes.

      PhysicsGrade-10
      1. Decreases, 2
      2. Increases, 2
      3. Decreases, 4
      4. Increases, 4
      Grade-10
      Physics

      When we go from outer space towards the Earth, the temperature of the atmosphere ______.

      1. Changes randomly
      2. Increases
      3. Decreases
      4. Remains the same

      When we go from outer space towards the Earth, the temperature of the atmosphere ______.

      PhysicsGrade-10
      1. Changes randomly
      2. Increases
      3. Decreases
      4. Remains the same
      Grade-10
      Physics

      The apparent sunset takes place _____ minutes _____ the actual sunset.

      1. 2, before
      2. 2, after
      3. 3, before
      4. 3, after

      The apparent sunset takes place _____ minutes _____ the actual sunset.

      PhysicsGrade-10
      1. 2, before
      2. 2, after
      3. 3, before
      4. 3, after
      parallel
      Grade-10
      Physics

      When we go from outer space towards the Earth, the refractive index of the atmosphere ______.

      1. Changes randomly
      2. Increases
      3. Decreases
      4. Remains the same

      When we go from outer space towards the Earth, the refractive index of the atmosphere ______.

      PhysicsGrade-10
      1. Changes randomly
      2. Increases
      3. Decreases
      4. Remains the same
      Grade-10
      Physics

      The refractive index of hot air is _____ the refractive index of cool air.

      1. Equal to
      2. Greater than
      3. Smaller than
      4. None of the above

      The refractive index of hot air is _____ the refractive index of cool air.

      PhysicsGrade-10
      1. Equal to
      2. Greater than
      3. Smaller than
      4. None of the above
      Grade-10
      Physics

      The apparent position of a star is slightly raised w.r.t. its actual position. This is due to _____.

      1. Reflection of light through water
      2. Refraction of light through water
      3. Reflection of light through atmosphere
      4. Refraction of light through atmosphere

      The apparent position of a star is slightly raised w.r.t. its actual position. This is due to _____.

      PhysicsGrade-10
      1. Reflection of light through water
      2. Refraction of light through water
      3. Reflection of light through atmosphere
      4. Refraction of light through atmosphere
      parallel
      Grade-10
      Physics

      The refractive index of the atmosphere is _____.

      1. Constant everywhere
      2. Different in different places
      3. Is equal to 1 everywhere
      4. Is equal to 0 everywhere

      The refractive index of the atmosphere is _____.

      PhysicsGrade-10
      1. Constant everywhere
      2. Different in different places
      3. Is equal to 1 everywhere
      4. Is equal to 0 everywhere
      Grade-10
      Physics

      The refractive index of a medium depends upon the ____ of the medium.

      1. Optical density
      2. Material density
      3. Transparency
      4. Opacity 

      The refractive index of a medium depends upon the ____ of the medium.

      PhysicsGrade-10
      1. Optical density
      2. Material density
      3. Transparency
      4. Opacity 
      Grade-10
      Physics

      The apparent sunrise takes place _____ minutes _____ the actual sunrise.

      1. 2, before
      2. 2, after
      3. 3, before
      4. 3, after

      The apparent sunrise takes place _____ minutes _____ the actual sunrise.

      PhysicsGrade-10
      1. 2, before
      2. 2, after
      3. 3, before
      4. 3, after
      parallel

      card img

      With Turito Academy.

      card img

      With Turito Foundation.

      card img

      Get an Expert Advice From Turito.

      Turito Academy

      card img

      With Turito Academy.

      Test Prep

      card img

      With Turito Foundation.