Sujeet Kumar

Question 1.Compare the following numbers. Solution:i. 7, -2If a and b are positive numbers such that a < b, then -a > -b.Since, 2 < 7 ∴ -2 > -7 Here, the denominators of the given numbers are not the same.LCM of 12 and 16 = 48Alternate method:15 × 16 = 24012 × 7 = … Read more

Question 1.Show the following numbers on a number line. Draw a separate number line for each example. Solution:i. 3/2, 5/2, – 3/2Here, the denominator of each fraction is 2.∴ Each unit will be divided into 2 equal parts. Here, the denominator of each fraction is 5.∴ Each unit will be divided into 5 equal parts. … Read more

Textbook Questions and Answers 1. Search and you will find: Question a.Our galaxy is called ………… .Answer:Our galaxy is called the Milky Way and Mandakini. Question b.For measuring large distances, ………… is used as a unit.Answer:For measuring large distances, the light year is used as a unit. Question c.The speed of light is …………. km/s.Answer:The speed of light … Read more

Textbook Questions and Answers 1. Complete the following by using the correct option: Question a.Air, water, minerals, soil are ………….. factors of an ecosystem. (physical, organic, inorganic)Answer:Air, water, minerals, soil are physical factors of an ecosystem. Question b.River, ponds, ocean are …………. ecosystems, (land, aquatic, synthetic)Answer:River, ponds, ocean are aquatic ecosystems. Question c.Man is ………….. in an ecosystem. (producer, … Read more

Textbook Questions and Answers 1. Try to find it: Question a.Plastic shows …………. property, hence it can be moulded to any shape.Answer:Plastic shows plasticity property, hence it can be moulded to any shape. Question b.Motor cars are coated with ……… .Answer:Motor cars are coated with Teflon. Question c.Thermocol melts at ………… °C.Answer:Thermocol melts at more than 100 °C (it is … Read more

Textbook Questions and Answers 1. Fill in the blanks: Question i.The perpendicular to the mirror at the point of incidence is called …………. .Answer:The perpendicular to the mirror at the point of incidence is called the normal. Question ii.The reflection of light from a wooden surface is ……….. reflection.Answer:The reflection of light from a wooden surface … Read more

Textbook Questions and Answers 1. Fill in the blank with appropriate word: Question a.The region in a sound wave, with higher pressure and density is called ………….. and that with low pressure and density is called ……….. .Answer:The region in a sound wave, with higher pressure and density is called compression and that with low pressure and … Read more

Textbook Questions and Answers 1. A. Whom should I pair with? Question a. Group ‘A’ Group ‘B’ 1. Temperature of a healthy human body a. 296 K 2. Boiling point of water b. 98.6 °F 3. Room temperature c. 0°C 4. Freezing point of water d. 212 °F Answer: Group ‘A’ Group ‘B’ 1. Temperature … Read more

Textbook Questions and Answers 1. Complete the statement by filling the gaps using appropriate term from the terms given in the brackets:(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign) Question a.An ……….. is drawn in between the reactants and products while writing the equation for … Read more

Textbook Questions and Answers 1. Identify the following solutions, whether they are acid or base. Question a. Answer: 2. Write chemical names from given formulae.H2SO4, Ca(OH)2, HCl, NaOH, KOH, NH4OH Question a.Write the chemical names from given formulae: H2SO4, Ca(OH)2, HCl, NaOH, KOH, NH4OHAnswer: 3. Sulphuric acid has highest importance in chemical Industry. Why? Question … Read more