English Medium कक्षा १० - CBSE Question Bank Solutions for Science

In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:

A chemical reaction does not involve:

It is necessary to balance a chemical equation in order to satisfy the law of:

When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

Magnesium ribbon is rubbed before burning because it has a coating of ____________.

Name the products formed when iron filings are heated with dilute hydrochloric acid.

Myopia and hypermetropia can be corrected by:

In torches, search lights and headlights of vehicles the bulb is placed ______.

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power:

Assertion: Myopia is the defect of vision in which a person cannot see distant objects clearly.

Reason: This due to eye-ball being too short.

Assertion: Concave mirrors are used as reflectors in torches, vehicle head lights and in search lights.

Reason: When an object is placed beyond the center of curvature of a concave mirror, the image formed is real and inverted.

Which of the following statement is correct?

Myopia may arise due to ____________.

A student traces the path of a ray of light passing through a rectangular slab.

For measuring the angle of incidence, he must position the protractor in the manner shown in the figure:

An object is placed at a distance of 0.25 m
in front of a plane mirror. The distance between the object and image will be ______.

Which of the following correctly represents a balanced chemical equation?

Why is it important to balance a skeletal chemical equation?

Which form of carbon is found in Golkonda mines of Karnataka?

Which of the following statements about graphite and diamond is true?

What is the difference between genetic drift and change due to natural selection?