Our Environment Previous Years Questions Choose the option giving correct matching the item given in Column I & II. a. A : (iii), B : (i), C : (iv), D : (ii)b. A : (iii), B : (iv), C : (i), D : (ii)c. A : (iii), B : (iv), C : (ii), D : […]
Life Processes Previous Years Questions : Solutions List the steps of preparation of temporary mount of a leaf peel to observe stomata. [CBSE 2018] [2Marks]Sol:The following steps of preparation of temporary mount of a leaf peel to observe stomata are : (i)Remove a healthy leaf from the plant.(ii)Remove a part of peel from the lower surface […]
Metals and Non-Metals Previous Years Questions : Solutions Show the formation of Na2O by the transfer of electrons. [CBSE 2019] [2 Marks]Sol: Show the formation of magnesium oxide by the transfer of electrons. [CBSE 2019] [2 Marks]Sol: What are ionic compounds ? Why do ionic compounds not conduct electricity in the solid state? [CBSE 2019] [2 Marks]Sol:The compound […]
Acids, Bases and Salts Previous Years Questions : Solutions If 10 ml of H2SO4 is mixed with 10 ml of Mg(OH)2 of the same concentration, the resultant solution will give the following colour with universal indicator: [1 Mark] [CBSE 2020] Red Yellow Green BlueSol:The Correct option is (c) Green 2 mL of sodium hydroxide is added to a […]
Chemical Reactions and Equations Previous Years Questions : Solutions Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be categorised as:-a. displacement and redoxb. decomposition and redoxc. displacement and endothermicd. decomposition and exothermic [1 mark] [CBSE 2020]Sol:(b) decomposition and redox. What is observed after about 1 hour of adding the […]
Light – Reflection & Refraction Previous Years Questions : Solutions The image distance from the eye lens in the normal eye when we increase the distance of an object from the eye increases decreases remains unchanged depends on the size of the eyeball [1 mark] [CBSE 2020]Sol:(3) remains unchanged Four students A, B, C and […]
Electricity Previous Years Questions : Solutions Define 1 kilowatt hour. [1 mark] [CBSE 2019]Sol: Electrical energy consumed by apliances is said to be 1 kilowatt hour if, it operates power of 1000 watt in 1 hour. The values of mA and µA are: [1 mark] [CBSE 2020] 10-6 A and 10-9 A respectively 10-3 A and 10-6 A respectively […]
Aim To identify the different parts of an embryo of a dicot seed (pea, gram or red kidneybean). Materials Required Seeds of bengal gram/red kidney bean, forceps, cloth, magnifying glass, petridish, water. Theory Procedure Soak a few bean seeds and keep them overnight. Drain the excess water. Cover the seeds with a moist cloth and […]
Aim To study homology and analogy with the help of models/charts of animals and models specimens of plants. Material Required Plant specimens such as Bougainvillea, cucurbits, potato and sweet potato. Animal models like bird, butterfly, forelimb of frog. Theory Homologous organs: The organs which perform different functions in different species but have similar basic structure […]
Aim To study (a) binary fission in Amoeba, and (b) budding in yeast with the help of prepared slides. Materials Required Compound microscope, permanent slides of binary fission in Amoeba and budding in yeast. Theory Binary Fission – This is a type of asexual reproduction which takes place in Amoeba. In this type of reproduction, […]