SSLC (English Medium) Class 8 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Pressure is directly proportional to the area of contact.

Analogy

Broader straps: ______:: Thin needles: ______.

Assertion: The pressure at the bottom of the sea is lesser than that near the surface.
Reason: The pressure exerted by a liquid depends upon the depth of the liquid and density of the liquid.

What is thrust?

Explain the variation of the pressure exerted by liquid with respect to the following factors.

1. Amount of liquid
2. Depth
3. Shape and size of the container

Explain why the cutting instruments are sharpened.

Cooking in a place located at a higher altitude is difficult. Why?

Why dams are made stronger and thicker at the bottom than at the top?

Why do scuba divers wear a special suit while they go into deep sea levels?

Determine the pressure when a force of 200 N acts on the area

1. 20 m²
2. 8 m²

Spherical mirrors are one form of ______ mirrors.

Name the two types of spherical mirrors.

The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?

What is the difference between virtual images of an object formed by a concave mirror and a convex mirror?

The handles of cooking utensils are made of ______.

Heat is the transfer of energy between two objects at different temperatures.

When ice changes into a liquid, it absorbs energy.

When a liquid boils, energy is absorbed.

Sound cannot travel in ______.

The speed of sound is ______ in solids than in liquids