List of top Questions asked in CBSE Class X

Fill in the blank by using the correct form of the word in the bracket, for the given portion of a letter.
Enclosed is the report that _______ (summarize) the study conducted on the impact of climate change on crop yield in the region.
Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.
atmospheric air is being passed

In the experimental set-up shown above in diagram (I) atmospheric air is being passed into lime water with a syringe while in diagram (II) air is being exhaled into lime water. The time taken for the lime water to turn milky in both the test tubes is different. Give reason.
Design an experiment to demonstrate that carbon dioxide is essential for photosynthesis. Write the observation and conclusion of the experiment.
What is dispersion of white light ? State its cause. Draw a diagram to show dispersion of a beam of white light by a glass prism.
Name the ore of mercury and state the form in which it is found in nature. Write the chemical equations along with the condition required for the reactions involved in the extraction of mercury from its ore.
Name a plant growth hormone synthesized at the shoot tip. Explain its effect on the growth of a plant in response to light.
What is the mass ratio of the gases collected at the anode and cathode?
Name the gases collected at the anode and cathode.
Is the reaction exothermic or endothermic?
Why is the electrolysis of water called a decomposition reaction?
The filament of an electric lamp draws a current of 0.5 A, which lights for 2 hours. Calculate the charge that flows through the circuit.
“The linear magnification produced by a spherical mirror is +3.”Based on this statement answer the following questions:
(a) What is the type of mirror?
(b) Where is the object located?
(c) List two properties of the image formed (other than the size/magnification).
Write chemical equation for the chemical reaction which occurs when the aqueous solutions of barium chloride and sodium sulphate react together. Write the symbols of the ions present in the compound precipitated in the reaction.
Copper powder is taken in a china dish and heated over a burner.Name the product formed and state its colour. Write the chemical equation for the reaction involved.
Write the formula and the molecular mass of the third homologue of alcohols. State how the boiling point of an alcohol changes as one moves from lower to higher homologues.
Write the other name given to lymph. State its two functions.
Sometimes while running, athletes suffer from muscle cramps. Why? How is the respiration in this case different from aerobic respiration?
Assertion (A): Green plants trap only 1% of the energy of sunlight that falls on their leaves. Reason (R): All green plants are the producers in a food chain.
Assertion (A): Electrons move from lower potential to higher potential in a conductor. Reason (R): A dry cell maintains electric potential difference across the ends of a conductor.
The current carrying device which produces a magnetic field similar to that of a bar magnet is:
The colour of light for which the refractive index of glass is minimum is:
The phenomena of light involved in the formation of a rainbow are:
How will the image formed by a convex lens be affected, if the upper half of the lens is wrapped with a black paper?
uniform magnetic field
A uniform magnetic field exists in the plane of paper as shown in the diagram. In this field, an electron (e−) and a positron (p+) enter as shown. The electron and positron experience forces :