List of top Science Questions

The anther contains:
Which of the following is a plant hormone?
Reproduction by means of regeneration occurs in:
The autotrophic mode of nutrition requires:
The gap between two neurons is called a/an:
Chemical reaction CuSO$_4$ + Fe $\rightarrow$ FeSO$_4$ + Cu is:
The ketone in the following is:
The pH value of a neutral solution is:
The element producing hydrogen gas with cold water is:
Two wires of resistances R and 2R are joined first in series and then in parallel. If the total resistances in the two conditions are \( R_1 \) and \( R_2 \) respectively, then \( R_1 / R_2 \) will be:
Functional group in propanal is:
The colour having the largest angle of deviation on passing white light through a prism will be:
The image by a convex mirror of an object placed at infinity is:
The cause of twinkling of stars is:
Which of the following lenses should be used to read small letters?
Describe in brief the structure of the kidney in humans and also describe its functions.
Write a short note on pH of a solution.
Write a short note on unsaturated hydrocarbon.
Explain the formation of \( \text{Na}^+ \text{Cl}^- \) by combination of Na atom (Atomic number 11) and Cl atom (Atomic number 17).
State any two properties of the electrochemical series.
What is an electromagnet? State its two uses.
How does an electromagnet differ from a permanent magnet?
An object of 3 cm height is placed at a distance of 8 cm from a concave mirror which produces a virtual image of 4.5 cm height. Find the position of the image and focal length of the mirror.
What is the unit of specific resistance? A resistance of 25 \( \Omega \) is connected to a 12-volt battery. Calculate the heat energy in joules generated per minute.
Explain why the colour of the clear sky appears blue.