List of top Science Questions

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.
How does an electromagnet differ from a permanent magnet?
What is an electromagnet? State its two uses.
What are the factors on which the force acting on a current-carrying conductor depends when placed in a uniform magnetic field? Write the rule to find the direction of this force.
Explain why the colour of the clear sky appears blue.
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.
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.
The product of photosynthesis in plants is
Which among the following is not a plant hormone?
Which of the following plants has a unisexual flower?
Which type of mirror is used as a rear-view mirror in cars? Why do we prefer it?
How much organic matter reaches from one trophic level to the next trophic level?
Intake of oxygen from outside of the body and breakdown of food sources as per requirement of the cell is called
The main thinking part of the brain is called
Which is not true for metals?
Nature of hydrogen ion (\( H^+ \)) is
Number of molecules of water in one molecule of washing soda is
The number of sex chromosomes in humans is
Which is a non-metal in the following?
Which is formed by reaction of Plaster of Paris with water?
Which is obtained by the reaction of ethanol with sodium?
Which of the following does not represent electrical power in a circuit?