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

(1) Why do we have to bring a small object near the eyes in order to see it clearly?
(2) If we bring an object closer than 25 cm from the eyes, when can we not see it clearly even though it subtends a bigger angle at the eye?

Out of an A.C. generator and a D.C. generator:

1. Which one uses a commutator (split rings)?
2. Which one uses slip rings?

Find the odd one out: Aadhaar card, PAN card, Greeting card, Credit card.

What is electric motor?

List animals and plants from pond ecosystem.

What colours lie on the two sides of the ‘green colour’ in the spectrum of white light?

Name the three nonmetals in the second period of the modern periodic table.

Name the scientist who prepared modern periodic table.

Complete and balance the following equations:

Translate the following statements into chemical equations and then balance the equations:
Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.