Important questions for Class 10 for this subjects English, Mathe, Science, Social Science, Hindi, prepares you for Class 10 for this subject. Students are preparing for upcoming cbse exam. This important question provides students to practice to good marks in exam. Practice makes a student perfect.

Question : An organic compound A is widely used as a preservative in pickles and has a molecular formula C₂H₄O₂. This compound reacts with ethanol to form a sweet smelling compounds B. (i) Identify the compounds A. (ii) Write the chemical equation for its reaction with ethanol to form compounds B. (iii) How can we get compounds A back from B? (iv) Name the process and write corresponding chemical reaction.

Important Question : Rajesh put the 10 g raisins in 100 mL distilled water which is at 10o C below the room temperature while Ajit put the same amount of raisins in 100 mL distilled water at 10o C above the room temperature. After an hour, percentage of water absorbed by the raisins will be: (a) Same in both cases. (b) More in Rajesh’s beaker. (c) More in Ajit’s beaker.(d) Exactly twice as much as in Ajit as in Rajesh’ beaker.

Question : a) State the limitations to the use of electrical impulse in transmission of information during responses to stimulus. b) What is synapse? Draw the labeled diagram of the structural and functional unit of nervous system. OR a) State three main differences between thermal power and hydro power plants. b) Why is the slurry left behind in a bio-gas plant considered useful? c) Name a place in India where fields of natural gas are found.

Question : Number of vultures are decreasing remarkably now-a-days, which is a matter of concern. Answer the following questions relating to the statement given above. (i) Vultures belong to which category of animals? (ii) What is their role in nature to maintain ecological balance? (iii) At which trophic level will you place vultures, in a food chain? (iv) Give the energy flow diagram in an ecosystem. How much energy is passed on at each trophic level.

Important Question : a. State the relation between object distance, image distance and focal length of a spherical mirror. b. Draw a ray diagram to show the image formed by a concave mirror when an object is placed between pole and focus of the mirror. c. A concave mirror of focal length 15 cm forms an image of an object kept at a distance of 10 cm from the mirror. Find position, nature and size of the image formed by it.

Question : a) Explain how we see different colors of an object. Why it is that some people are not able to Distinguish between different colors? The chicken wakes up with the sunrise and sleeps with the sunset. How does it manage? b) Distinguish between Delayed, prompt and spontaneous fission of nuclei. c) What is the cause of release of usually high energy in nuclear fission reaction? d) Name any two artificial satellite launched by India.

Q. Two main parks in your locality have suffered from neglect on the part of local authorities. They have virtually been taken over by undesirable elements. As a result the residents have stopped going to the parks. Write a letter in 100-120 words to the editor of a local newspaper expressing your concern about the problems the neglect has created and suggest measures to reclaim the parks for children. You are Gautam/Gauri 2, Gobind Enclave, Meerut.