Light — Science STD 7 — Question

While playing in a park, a child was stung by a wasp. Some elders suggested applying a paste of baking soda, and others lemon juice as a remedy. Which remedy do you think is appropriate and why?

Observation: Metal spoon and metal coin produce a ringing sound. On the other hand, coal and wood produce dull sounds.

Name the type of mark for which we should look at an electrical appliance before buying.

What is the process by which heat is transferred through direct contact of particles in a material?

What might happen even if experiments confirm what we expect?

Briefly explain how will decide which object is moving fast and which one is moving slow.

Which type of teeth do you use for biting and cutting and which one for piercing and tearing?

Why is the process of reproduction necessary?

While going inside a forest, it becomes darker. Why?

State whether the following statements are True or False:
An object can be seen only if it emits light.