Pressure, Winds, Storms, and Cyclones — Practice

Question 1

The SI unit of pressure is

Accepted Answer

newton/metre² (N/m²), also called the pascal

Question 2

Two vessels of very different widths are filled with water to the same height. Where is the pressure at the bottom greater?

Accepted Answer

It is the same in both

Question 3

A box weighing 300 N rests on the floor. Its base measures 2 m by 3 m. Find the pressure it exerts on the floor. If it is turned onto a face measuring 1 m by 2 m, what is the new pressure?

Accepted Answer

50 Pa on the large face; 150 Pa on the small face

Question 4

Why is it safer to keep doors and windows open during a storm with high-speed winds?

Accepted Answer

It lets the pressure inside fall too, so the difference across the roof is smaller

Question 5

Assertion (A): A rubber sucker will not stick to a rough wall. Reason (R): Air leaks in through the gaps between the sucker's cup and a rough surface.

Accepted Answer

Both A and R are true, and R is the correct explanation of A

Question 6

Fig. 6.19 shows pressures falling from 1008 mb at the edge of a cyclone to 994 mb at its centre. Which statement is best supported?

Accepted Answer

The centre is the lowest-pressure point and the calmest place in the system

Question 7

Why does the chapter use ONE sheet of chart paper, folded and then unfolded, in Activity 6.3 rather than two sheets of different sizes?

Accepted Answer

So that the weight of the covering cannot be the explanation.

Question 8

The chapter says the atmosphere presses on a 15 cm × 15 cm patch with 2250 N — the weight of a 225 kg object. Show that this is consistent with the pressures marked on Fig. 6.19.

Accepted Answer

It works out to 1,00,000 Pa = 1000 mb, which sits inside the 994-1008 mb range on the figure.

Practice — Pressure, Winds, Storms, and Cyclones

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