Sources of Energy Previous Years Questions Write the energy conversion that takes place in a hydropower plant. [1 mark] [CBSE 2018] What is a dam? Why do we seek to build large dams? While building large dams, which three main problems should particularly be addressed to maintain peace among local people? Mention them. [3 marks] […]
Life Processes Previous Years Question In the given diagram of a closed stomata : (1), (2), (3) and (4) respectively are a. nucleus, chloroplast, guard cell, vacuoleb. nucleus, chloroplast, vacuole, guard cellc. chloroplast, nucleus, vacuole, guard cell d. vacuole, guard cell, nucleus, chloroplast [1 mark] [CBSE 2023] Given below are two columns, Column I shows […]
Life Processes Important questions List down the raw materials for photosynthesis. Specify what is the role of bile juice in the process of digestion? Name the respiratory organ in fish & earthworm. Name the types of blood vessels used for the transportation of blood. What is dialysis? How is respiration in plants & respiration in […]
Life Processes Notes Life Processes:- The processes which together perform the maintenance job of the living organisms are called life processes. Nutrition:- The process of taking of food inside the body and utilising it to get energy is known as nutrition. Modes of nutrition:- Autotrophic mode of nutrition Heterotrophic mode of nutrition Autotrophic mode of […]
Sources of Energy Notes Characteristics of a good source of energy:- Should have high calorific value. Easily available. Easy to transport & store. Should be economical. Should be ecofriendly. Safe & convenient to use. Renewable source of energy:- The source of energy which can be continuously generated by natural processes & whose supply is unlimited […]
Human Eye and Colourful World Important Questions The far point of a human eye has been shifted to 2 m from infinity. Name the eye defect the person is suffering from & also write its correction. Draw a ray diagram for its correction. Find the power of the lens required to correct this defect. Name […]
Human Eye and Colourful World Previous Years Questions The phenomena of light involved in the formation of rainbow are Refraction, dispersion and scattring. Refraction, reflection and scattring. Refraction, dispersion and internal reflection. Refraction, dispersion and total internal reflection. [CBSE 2023] [1 Mark] In the following diagram showing dispersion of white light by a glass prism, […]
Human Eye and Colourful World Notes Human eye ball is approximately spherical in shape with diameter of about 2.3 cm. Light enters the eye through a thin membrane called the cornea. Iris controls the size of pupil. Pupil regulates the amount of light entering the eye. Image is formed on retina & its nature is […]
Chemical Reactions and Equations Previous Years Questions Select the appropriate state symbols of the products given as X and Y in the following chemical equation by choosing the correct option from table given below:Zn(s) + H2SO4(l) → ZnSO4(X) + H2(Y)a. X is (s) and Y is (l) b. X is (aq) and Y is (g)c. […]
Chemical Reactions and Equations Important Questions What is a balanced chemical equation? Why is it important to balance a chemical equation? Define exothermic reaction. Why respiration is considered as exothermic reaction? A solution of substance ‘X’ is used for whitewashing.i. Name the substance ‘X’ & write its formula.ii. Write the reaction of ’X’ with water. […]