Sujeet Kumar

Textbook Questions and Answers 1. Following are some statements about pollution. Which type of pollution do those express: Question a.Fog seems to be appearing in Delhi during day hours.Answer:Air pollution-Smog(The sentence should have the word Smog and not fog. Smog is fog with smoke. Only fog cannot be polluting, but the smog is.) Question b.Many … Read more

Textbook Questions and Answers 1. Complete the table: Question a. Answer: Property of metal Use in everyday life i. Ductility i. Gold, silver ornaments ii. Malleability ii. Aluminium sheets, galvanised sheets iii. Conduction of heat iii. Stainless steel vessels, copper vessels, boilers iv. Conduction of electricity iv. Copper wires v. Sonority v. Brass articles 2. … Read more

Textbook Questions and Answers 1. Choose the appropriate option and rewrite the following statements: Question a.The intermolecular force is ……………. in the particles of solid.(a) minimum(b) moderate(c) maximum(d) indefiniteAnswer:(c) maximum Question b.Solids retain their volume even when external pressure is applied. This property is called …………… .(a) plasticity(b) incompressibility(c) fluidity(d) elasticityAnswer:(d) elasticity Question c.Matter is … Read more

Textbook Questions and Answers 1. Answer the following. Question a.What is the difference in the atomic models of Thomson and Rutherford?Answer: Thomson’s atomic model Rutherford’s atomic model 1. According to Thomson’s atomic model, the negatively charged electrons are embedded in a gel of positive charge. 1. According to Rutherford’s atomic model the negatively charged electrons … Read more

Textbook Questions and Answers 1. Write proper words from the following group of words in the blanks and rewrite the completed sentences:(magnetism, 4.5V, 3.0V, gravitational attraction, potential difference, potential, higher, lower, 0V) Question a.Water in the waterfall flows from a higher level to the lower level because of …………… .Answer:Water in the waterfall flows from … Read more

Textbook Questions and Answers 1. Write proper word In the blank space: Question a.The SI unit of force is the ………..(dyne, newton, joule)Answer:The SI unit of force is the newton. Question b.The air pressure on our body is equal to the …………. pressure.(atmospheric, sea bottom, space)Answer:The air pressure on our body is equal to the atmospheric pressure. Question … Read more

Textbook Questions and Answers 1. Distinguish between- Infectious and non – infectious diseases. Infectious diseases Non-infectious diseases 1. The diseases which can be transmitted from one patient to other person are called infectious diseases. 1. The diseases which cannot be transmitted from one patient to other person, are called non-infectious diseases. 2. Contaminated air, water, … Read more

Textbook Questions and Answers 1. Use Whittaker method to classify bacteria, protozoa, fungi, algae, prokaryotic, eukaryotic, microbes. Living World And Classification Of Microbes Exercises  Question 1.Use Whittaker method to classify bacteria, protozoa, fungi, algae, prokaryotic, eukaryotic, microbes.Answer: 2.  Complete the five kingdom method of classification using-living organism, prokaryotes, eukaryotes, multicellular, unicellular, protista, animals, plants, fungi. … Read more

Textbook Questions and Answers 1. Fill in the blanks with the proper words. a. The wavelength of visible light is between …………………..….. and …………………..…. .b. GMRT is used for …………………..….. waves.c. A certain X-ray telescope is named after scientist …………………..…. .d. The first scientist to use a telescope for space observations …………………..…. .e. The biggest … Read more

Textbook Questions and Answers 1. Complete the following sentences by choosing the appropriate words from the brackets.(Inheritance, sexual reproduction, asexual reproduction, chromosomes, DNA, RNA, gene) a. Hereditary characters are transferred from parents to offsprings by …………………………….., hence they are said to be structural and functional units of heredity.b. Organisms produced by …………………………….. show minor variations.c. … Read more