Available Answers

1. 1.

   Fill in the blanks.

   1. A dog barks while a cat ______________.
   2. Sun is to solar energy as water is to ________________ energy.
   3. Wind is renewable energy while __________________ is non-renewable energy.
   4. A firefly is a nature source of light while a bulb is an ______________ source of light.
   5. Rotation is to day and night while ____________ is to seasons.
   6. A forceps is a lever while a knife is a _______________.
2. 2.

   1. What kind of sound does it make?	2. What kind of sound does it make?
   3. Does it have a pleasant sound?	4. What type of energy does it provide?
   5. Is it a renewable or non-renewable energy?	6. Is it a biodegradable or non-biodegradable waste?
   7. What type of lever is it?	8. What do the dark patches near the horses signify?

    

3. 3.

   State True or False.

   1. Animals make warning sounds.
   2. The police siren warns the people of a medical emergency.
   3. Work is the capacity to do work.
   4. The major source of heat on the Earth is the Sun.
   5. A shadow is formed when a transparent object comes in the path of light.
   6. There are eight types of lunar eclipses.
   7. Levers are of three kinds.
   8. Washing hands and feet with soap ensures removal of dirt.
4. 4.

   What are warning sounds? Explain giving examples.
5. 5.

   Describe the various sources of energy.
6. 6.

   How can materials be classified based on light passing through them?