Available Answers

1. 1.

   Name the source of light and energy on Earth.
2. 2.

   Can we see in the dark? Why or why not?
3. 3.

   If the Sun was not there, would life have been possible on the Earth?

4. 4.

   State True or False.

   1. The colour of the shadow is always dark.
   2. Revolution causes day and night.
   3. Rotation causes seasons.
   4. Earth's axis is imaginary.
5. 5.

   Tick (√) the correct option.

   1. This is a luminous object.
      1. Candle
      2. Book
      3. Table 
      4. Pen
   2. This is a non-luminous object.
      1. Spoon
      2. Tubelight
      3. Bulb
      4. Lamp
   3. This is an opaque object.
      1. Bulb
      2. Plastic 
      3. Glass
      4. Wood
   4. A _______________ cannot be obtained without a screen.
      1. light
      2. mirror 
      3. shadow 
      4. none of these
   5. The Earth's ____________ is slightly tilted to one side.
      1. orbit
      2. equator
      3. pole
      4. axis 
   6. When the Moon blocks the sunlight but leaves a ring of fire around, it is known as _______________ eclipse.
      1. solar
      2. annular
      3. lunar 
      4. none of these
6. 6.

   Fill in the blanks.

   1. _______________ (Opaque/Transparent) materials are those that allow light to pass through them completely.
   2. A ____________ (shadow/rain) is formed when an opaque object comes in the path of light.
   3. The Earth not only rotates on its axis, it also moves around the Sun in a fixed path called ____________ (orbit/oval).
   4. A/an __________________ (shadow/eclipse) is an event when an astronomical object moves under the shadow of another astronomical object.
   5. The ____________________ (solar/lunar) eclipse occurs when the three celestial bodies (Sun, Earth and Moon) form a line, wherein Earth comes in between the Sun and the Moon.