the human eye and the colourful world — Science STD 10 — Question

Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, for example, hydrogen. After the formation of four bonds, carbon attains the electronic configuration of ... .

Where should an object be placed to obtain its image as real, inverted and of the same height as the object by a convex lens?

Which of the following is a strong acid?

In an ecosystem third trophic level is always occupied by which animals?

Amount of light entering eye is controlled by _______ .

What is formed in independently inherited traits when plants showing different characteristics are bred?

What is correct for redox reaction?
(i) Reducing agent undergoes oxidation.
(ii) Reducing agent undergoes reduction.
(iii) Reduction reaction always occurs at cathode.
(iv) Oxidising agent undergo oxidation.

Which layer is formed on Al , when it is exposed to air?

The refractive index of glass is maximum for __________ light.

Which unicellular fungus shows budding?