Sujeet Kumar

Textbook Questions and Answers 1. Fill in the blanks. a. The number of molecules of water of crystallization in washing soda is …………….…. .b. The chemical name of baking soda is …………….…. .c. …………….…. is used in treatment of hyperthyroidism.d. The chemical name of Teflon is …………….…. .Answer:a. 10b. Sodium bicarbonatec. Iodine -123d. Polytetra fluoroethylene … Read more

Textbook Questions and Answers 1. Fill in the blanks. a. The number of molecules of water of crystallization in washing soda is …………….…. .b. The chemical name of baking soda is …………….…. .c. …………….…. is used in treatment of hyperthyroidism.d. The chemical name of Teflon is …………….…. .Answer:a. 10b. Sodium bicarbonatec. Iodine -123d. Polytetra fluoroethylene … Read more

Textbook Questions and Answers 1. Select the proper option and complete the statements(single, all, double, ionic, carbon, give and take, hydrogen, multiple, share, most, covalent) a. A carbon atom forms a ….……………. bond with other atoms. In this bond the two atoms ….electrons.Answer:covalent, share b. All the carbon bonds in a saturated hydrocarbon ….……………. electrons.Answer:share … Read more

Textbook Questions and Answers 1. Fill in the blanks and explain. a. Sound does not travel through ……………………….……….. .b The velocity of sound in steel is ……………………….………… than the velocity of sand in water.c. The incidence of ……………………….………… in daily life shows that the velocity of sound is less than the velocity of light.d. To … Read more

Textbook Questions and Answers 1. Fill in the blanks to complete the statements. Justify the statements. a. While working with a computer we can read the information stored in its memory and perform other actions in ………………………. memory.b. While presenting pictures and videos about the works of scientists, we can use ……………………… .c. To draw … Read more

Textbook Questions and Answers 1. Match the items in column ‘A’ with the proper ones in coloum ‘B’ and explain their impact on the environment. Column ‘A’ Column ‘B’1. Harmful waste – a. Glass, rubber, carry bags, etc.2. Domestic waste – b. Chemicals, pigments, ash, etc.3. Biomedical waste – c. Radioactive material4. Industrial waste – … Read more

Textbook Questions and Answers 1. Complete the statements using the proper option from those given below. Explain the statements. (mycotoxins, budding, rhizobium) a. Yeast reproduces asexually by the …………………….. method.Answer:The yeast cells develop small round bodies on the parent cell. These are called buds. New daughter cells develop from these buds. b. Toxins of fungal … Read more

Textbook Questions and Answers 1. Complete the following table (Carefully study the carbon, oxygen and nitrogen cycles). Bio-geo-chemical cycles  Biotic processes  Abiotic processes 1. Carbon cycle 2. Oxygen cycle 3. Nitrogen cycle 2. Correct and rewrite the following statements and justify your corrections.a. Carnivores occupy the second trophic level in the food chain.b. The flow … Read more

Textbook Questions and Answers 1. Match the proper terms from columns A and C with the description in column B. 2. Complete the sentences by filling in the blanks and explain those statements.(angiosperms, gymnosperms, spore, Bryophyta, thallophyta, zygote)a. ……………….. plants have soft and fiber-like body. b. ……………….. is called the ‘amphibian’ of the plant kingdom.Answer:Bryophyta … Read more

Textbook Questions and Answers 1. Identify the odd one out and justify. (a) Chloride, nitrate, hydride, ammoniumAnswer:Ammonium is the odd one out as it is a basic radical and rest all are acidic radicals. Generally, basic radicals are formed by the removal of electrons from the atom of metals such as Na+, Cu2+. But there … Read more