EXERCISES

Which of the following plays an important role in the early-warning systems for cyclones?

Which of these things would you do if you live in the earthquake prone area?

$\left(\mathrm{i}\right)$ You would always keep an emergency kit ready.
$\left(\mathrm{ii}\right)$ You would have only open book shelves and open cupboards in your house.
$\left(\mathrm{iii}\right)$ You would fix the cupboards to the walls.
$\left(\mathrm{iv}\right)$ You would not keep breakable items on the upper shelves.

When we remove polyester or woollen cloth in dark, we can see spark and hear a cracking sound. These are due to

Match the column I with the column II and select the correct option.

In the given figure, layers of Earth are shown. Identify $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D}$ respectively, and choose the correct option.

Read the following passage and select the option which correctly fill the blanks.

(i) is the point of origin of an earthquake. (ii) measure the strength of an earthquake by estimating the amount of energy released at the focus. The point vertically above the origin point on the surface of the Earth, is (iii). Seismic waves are detected, recorded and measured using (iv).

Earthquakes at two places $\mathrm{A}$ and $\mathrm{B}$ were measured by a seismograph which recorded the magnitude as $2$ and $4$. The magnitude of tremors and the destructive energy at $\mathrm{A}$ and $\mathrm{B}$ can be compared as

A negatively charged rod is moved near conducting sphere as shown. What will be the movements of the electrons and protons in the conducting sphere?