List of top Science Questions

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 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:
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 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:
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.
What do you mean by alloys? Write the names and uses of two main alloys of copper.
Write the IUPAC name of the following compounds:
(a) HCHO
(b) CH3 - CH = CH2
Explain electrochemical series and write its two applications.
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.
Write the structural formulae of the following compounds:
(i) Ethanoic acid
(ii) Methanal
(iii) 1-Chloropropane
(iv) Nitromethane
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.
Normal blood pressure of a healthy human is:
Example of unisexual flower is:
Buds on leaf develop in:
Which of the following constitutes a food chain?
The image formed of an object at a distance of 25 cm from a convex mirror is half the length of the object. Determine (i) the distance of the image from the mirror, and (ii) the focal length of the mirror.
On placing a concave lens in the path of convergent rays, they focus on the axis in the back, 20 cm from the lens.
In the absence of a lens, where do the rays focus? The focal length of the lens is 30 cm.
Antimony is: