Available Answers

1. 1.

   Tick the correct answer.

   1. Wood is a transparent/opaque object.
   2. Tsunami/Earthquakes are measured in the Richter scale.
   3. A beam balance is a first/second class lever.
   4. Tides occur due to the Moon's/Sun's gravity.
   5. Sputnik-1/INSAT 1B was the first artificial satellite to be sent to space.
   6. Destruction of forests by cutting down trees is called afforestation.
2. 2.

   Write one word for the following.

   1. Any article used to support an injured bone: ______________
   2. A natural calamity that is caused by undersea earthquakes: ______________
   3. Objects through which light can pass partially: ______________
   4. An eclipse that occurs when the Moon comes between the Sun and the Earth: ______________
   5. Big pits on the surface of the Moon: ______________
   6. The energy resources that have a constant supply and will not exhaust with use in future: ______________
3. 3.

   Never run when your clothes are on fire. Give reasons.
4. 4.

   Electric wires have a plastic coating on them. Give reasons.
5. 5.

   Floods are mostly followed by outbreak of diseases such as cholera. Give reasons.