[ Question Bank ] - 2022 — Science STD 10 — Question

(A, B, C) is a Dobereiner’s triad. complete the following chart and give reason for the

Element	A	B	C
Atomic mass	10.08	12.01	………………….

Describe the New Cartesian Sign Convention used in optics. Draw a labelled diagram to illustrate this sign convention.

What is nuclear fusion? Explain with an example. Write the equation of the reaction involved.

What are herbivores, carnivores and omnivores? Give two examples of each.

i. Identify the class of the animals shown in the figure.
ii. Write two characteristics of that class.

Write three methods of preventing rusting of iron.

What is meant by the ‘angle of incidence’ and the ‘angle of refraction’ for a ray of light? Draw a labelled ray diagram to show the angle of incidence and the angle of refraction for a refracted ray of light.

Give two examples of the effect of atmospheric refraction on a small scale in local environment.

State where an object must be placed so that the image formed by a concave mirror is:

1. Erect and virtual.
2. At infinity.
3. The same size as the object.