Page 5 - Class VII Worksheets Forces and Energy

SUBTOPIC: 3.5 Pressure between solids, 3.6 Pressure in liquids and
gases & 3.7 Particles on the move

Sl. No. QUESTIONS

1. A brick is kept in three different ways on a table as shown in Fig. The pressure exerted by the
brick on the table will be
(a) maximum in position A
(b) maximum in position B
(c) maximum in position C
(d) equal in all cases.

2. Define Pressure. Explain why shoulder bags are provided with broad straps and not thin strap.
3. Why do the pillars holding the track
of Metro trains have a broader
base?

4. Explain in brief the principle and working of Ink dropper.

5. Describe an activity to show that liquids exert equal pressure at the same depth.

6. Bhola was impressed by the miracle performed by baba Shyamdev, when Baba lied down on a
bed of nails. The nails did not hurt him. Bhola narrated this miracle to his friend Rahul. Rahul
explained to Bhola that, there is no magic or miracle here. Even he can do the same trick.
a) Why did Rahul say that, there is no miracle in this trick? Why did Baba Shyamdev not
hurt. himself?
b) Which quality is shown by Rahul here?

7. A man exerts a pressure of 14 Pa by applying a force of 70 N on a box. Calculate the area over
which the force is applied.

8. A force of 16 N is distributed uniformly on one surface of a
cube of edge 8 cm. Calculate the pressure on this surface.

9. Compare diffusion in gases and diffusion in liquids in terms of particle movement and speed.
Why does diffusion occur more quickly in gases?

5