Magnetism. — Science STD 8 — Question

Write about Sunitha William’s work at NASA.

If two mirrors are placed at an inclination of 30° then how many images can be seen?

Classify the following day-to-day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity, and catalyst.

Give two examples to verify that a force tends to change the static condition of a body.

An iron ball requires 9000 J heat energy to raise its temperature by 10°C. Calculate the heat capacity of the iron bail.

Define threshing.

Imagine that parallel rays are incident on an irregular surface. Are the rays reflected from the surface parallel to each other?

What is the significance of the symbol of an element?

Mention the properties of a magnet.

Ruthvik and Ruha hear a gunshot 2 second after it is fired. How far away from the gun they are standing? (Speed of sound in air is equal to 330ms^-1)