Human Eye and Colourful World — Science STD 10 — Question

Name any two waste products secreted by plants.

A man can read the number of a distant bus clearly but he finds difficulty in reading a book.A man can read the number of a distant bus clearly but he finds difficulty in reading a book.

1. From which defect of the eye is he suffering?
2. What type of spectacle lens should he use to correct the defect?

Why does the sky appear blue on a clear day?

What chemical properties of elements were used by Mendeleev in creating his periodic table?

What is meant by ‘tropisms’ (or tropic movements)? Explain with an example.

What happens to a beam of white light when it gets refracted through glass prism? Which colour deviates the most and the least after refraction through a prism? What is likely to happen if a second identical prism is placed in an inverted position with respect to the first prism. Justify your answer.

Describe an activity with labeled diagram to show that a current carrying conductor experiences a force in a magnetic field.

What happens when ethanol reacts with
i. sodium
ii. potassium permanganate solution.

What is meant by incineration? For what purpose is it used?