List of top Science Questions

Mendel got his primary education in:

Which of the following is an amphoteric oxide?

Chemical formula of propane is:

The kidneys in human beings are a part of which system?

The process of breakdown of pyruvate takes place in:

Matte mainly consists of:

Which of the following is an acidic salt?

The filament in an electric bulb is made of:

The transformation in an electric cell is:

In the chemical reaction, $2 FeCl_3 + 2 H_2O + Y \rightarrow 2 FeCl_2 + H_2SO_4 + 2 HCl$, Y is:

The image of an object placed between the pole and the focus of a concave mirror is formed:

Two wires of resistances $R_1$ and $R_2$ are joined in parallel. Their equivalent resistance will be:

Which lens is used in correcting the defect of long-sightedness (far-sightedness)?

When white light passes through a prism of glass, the colour of a light ray bent maximum towards the base of the prism is:

The magnification of the virtual image of an object placed at a distance of 0.2 m from the lens is 0.5. The lens will be:

What do you mean by sex chromosomes? Explain the process of sex determination in humans.

Write the chemical name and molecular formula of baking powder. What happens when baking powder is heated?

Write a short note on valency of carbon.

How can the three resistances 2 Ω, 3 Ω, and 6 Ω be connected, so that (i) total resistance of 4 Ω is obtained, and (ii) total resistance of 1 Ω is obtained?

Write the name, (ii) working, and (iii) colours of the insulation of the wires used in the domestic electrical distribution.

On which factors does the magnetic field due to a current-carrying conductor depend? Write and explain the name of the law used to find the direction of the magnetic field.

What do you mean by alloys? Write the names and uses of two main alloys of copper.

Write the structural formulae of the following compounds:
(i) Ethanoic acid
(ii) Methanal
(iii) 1-Chloropropane
(iv) Nitromethane

Explain electrochemical series and write its two applications.