Stars and the Solar System — Science STD 8 — Question

When a vessel is exposed to moist air for a long time, then a green coating is formed on its surface. The vessel must be made of:

Sound is produced by

Name the areas where animals are protected from any disturbance to them and their habitat.

Assertion (A) Candle can burn a block of wood.
Reason (R) Ignition temperature of wood is high.

The liquid material in the nucleus is:

When the world wildlife week is celebrated?

Which of the following is safest way to protect yourself from lightning?

Richter scale measures the strength of earthquakes

Richter scale measurement of the earthquake	Example of damages due to the earthquake
3.0-3.9	No damages but some vibrations felt
4.0-4.9	Cracks in windows, some unstable objects fall
5.0-5.9	Building walls may collapse. movement of furniture
6.0-6.9	Building roofs may collapse. loss of few lives
7.0-79	Cracks on ground, underground pipes broken, loss of many lives

(i) The damages from an earthquake are listed below.
2 people died
5 building roofs collapsed
12 building walls collapsed
What could be the likely reading on the richter scale for the earthquake?
(a) 4.8
(b) 5.4
(c) 6.5
(d) 7.3
(ii) Which of these statements is true about earthquake?
(a) Earthquakes can cause soil erosion.
(b) Most of the earthquakes occur in mountain regions.
(c) The location and duration of earthquakes can be predicted.
(d) Earthquakes are caused by the movement of underground plates.