List of top Science Questions

Write electronic configuration for the following elements:
(i) Sodium
(ii) Chlorine
Write short notes on the following:
(a) Acid rain
(b) Ductility and Malleability
(c) Micelle
Write an example of a combination reaction (write equation only).
Balance the following equations:
(i) Fe (s) + H2O (g) → Fe3O4 (s) + H2 (g)
(ii) C6H12O6 (aq) + O2 (aq) → CO2 (aq) + H2O (l)
State the right-hand thumb rule for finding the direction of magnetic field associated with a current carrying conductor. Show the magnetic field lines due to a straight current carrying conductor.
On which factors does the force acting on a current carrying conductor placed in a magnetic field depend?
What is the importance of fuse in electrical circuits? Total load of a house is 2200 W. Electricity is supplied at 220 V. What should be the rating of fuse used in the house? Write down the commercial unit of electrical energy.
An object of length 2 cm is placed in front of a convex lens perpendicular to its axis, having focal length of 20 cm. Distance of the object from the lens is 30 cm. Find the position and nature of the image.
Write the names of the wires used in the domestic electrical circuit and also write the colours of the insulating wires.
Which one of the following is the main substance responsible for ozone layer depletion?
Why did Mendel conduct his experiment?
Pyruvate is oxidized in which part of the cell in presence of oxygen?
Write a short note on hypermetropia and its correction.
Which one of the following make up the food chain?
Explain the phenomenon of refraction of light.
Give the formula for the focal length of a convex mirror. Give any two uses of the convex mirror.
Which atom has the property of catenation?
Autotrophic nutrition requires:
Unit of kidney, which takes part in the process of excretion is:
Xylem in the plants is responsible for:
Alkyne among the following is:
.......... is used in the form of fuel and medicine.
Following reaction:
\(\text{CaCO}_3 (s) \xrightarrow{\text{heat}} \text{CaO} (s) + \text{CO}_2 (g)\)
is an example of:
Which of the following metals is not in solid state at room temperature?
A 440 W, 220 V is marked on an electric bulb. The resistance of the filament of the bulb will be: