Available Answers

1. 1.

   Choose the correct answer:

   1. Objects which do not allow any light to pass through them are called −
      1. opaque objects
      2. transparent objects 
      3. translucent objects
      4. None of these
   2. A pinhole camera is a simple application of −
      1. reflection of light
      2. rectilinear propagation of light 
      3. refraction of light
      4. scattering of light
   3. A solar eclipse occurs only on a −
      1. new moon day
      2. full moon day
      3. half-moon day
      4. None of these
   4. A lunar eclipse occurs only on a −
      1. new moon day
      2. full moon day
      3. half-moon day
      4. None of these 
   5. A shadow is formed when light falls on −
      1. a transparent object
      2. a translucent object
      3. an opaque object
      4. All of these
   6. Umbra is the region of −
      1. complete darkness
      2. partial darkness 
      3. complete brightness
      4. partial brightness 
2. 2.

   Fill in the blanks:

   1. Light is a form of ___________________ that causes a sensation of _____________________.
   2. The star is a ____________________ source of light.
   3. Light travels in a __________________ path.
   4. Air is a ___________________ medium.
   5. The complete dark portion of a shadow is called _________________.
3. 3.

   Write True (T) and False (F) against the following statements :

   1. Light is a form of energy that causes in us the sensation of warmth or coldness.
   2. The moon is a natural source of light.
   3. Light travels in  a straight path.
   4. Light does not pass through vaccum.
   5. Lunar eclipse occurs on every full moon night. 
4. 4.

   Match the following:

   Column A	Column B
   1. Luminous object	a. Inverted image
   2. Non-luminous object	b. Umbra
   3. Translucent object	c. The sun
   4. Pinhole camera	d. The moon
   5. Lunar eclipse	e. Butter paper
   6. Solar eclipse	f. New moon day
   7. Shadow	g. Full moon day

    

5. 5.

   With proper reasoning, choose the odd one out:

   1. electric bulb, fire, lighted torch, Sun
   2. book, chair, table, burning candle
   3. wood, stone, cement, glass
   4. air, fog, mist, tissue paper
   5. umbra, penumbra, image, shadow 
6. 6.

   What is light?