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1. Fill appropriate terms in the blanks:(white cement, soap, detergent, wearing of bones, tooth decay, hard, soft, portiand, fatty acid) Question a.The substance that helps water to remove dirt from the surface of material is called …………… .Answer:soap Question b.Fluoride is used in toothpaste to prevent …………… .Answer:tooth decay Question c.Soap is a salt of … Read more

1. Who are my companions? Question a. Column ‘A’ Column B’ 1. Stainless steel a. Non-metal 2. Silver b. Compound 3. Bhajani mixture for milling c. Mixture 4. Salt d. Element 5. Coal e. Alloy 6. Hydrogen f. Metal Answer: Column ‘A’ Column B’ 1. Stainless steel e. Alloy 2. Silver f. Metal 3. Bhajani … Read more

Textbook Questions and Answers 1. Distinguish between the following. Question a.Physical change and Chemical changeAnswer: Physical changes Chemical changes 1. In a physical change material may change its 1. A change which after physical properties and shape, size, texture or state. composition also. 2. No new compound is formed. 2. New compound /substance is formed … Read more

Textbook Questions and Answers 1. Fill in the blanks with the right word from the brackets: Question a.The process of digestion starts from the ………….. (stomach, mouth).Answer:mouth Question b.Eyelids have …………… muscles. (voluntary, involuntary)Answer:involuntary Question c.……………. is not a function of muscular system. (production of blood cell, performing movement)Answer:Production of blood cells Question d.Muscles of … Read more

Textbook Questions and Answers 1. Answer the following questions. Question a.What is a cell?Answer:The cell is the fundamental, structural and functional unit of living organism. Question b.Name the different organelles in a cell.Answer:The nucleus, endoplasmic reticulum, Golgi bodies, lysosomes, mitochondria, vacuoles, plastids, chloroplasts are the different organelles in a cell. Question c.What are micro-organisms?Answer:The organisms … Read more

Textbook Questions and Answers 1. Find the odd man out: Question a.Famine, earthquake, cloudburst, railway accident.Answer:Railway accident. Question b.Drought, heavy rains/storm, tsunami.Answer:Drought. Question c.Lava, hot mud, ash, locusts.Answer:Locusts. Question d.Washing away of crops, attack of pests on crops, volcano, singeing of crops.Answer:Volcano. 2. What are the remedial measures for the following calamities? Question a.Famine:Answer:Following are … Read more

Chapter 9 Heat Textbook Questions and Answers Fill in the blanks: Question a.Maximum heat is absorbed by a ………….. coloured object.Answer:black Question b.……………. of heat does not require a medium.Answer:Radiation Question c.Conduction of heat takes place through a ……………. substance.Answer:solid Question d.The shining surface in a thermos flask decreases the outgoing heat by ……………… .Answer:reflection … Read more

Textbook Questions and Answers 1. Choose the correct option and fill in the blanks.(always repulsion, always attraction, displacement of negative charge, displacement of positive charge, atom, molecule, steel, copper, plastic, inflated balloon, charged object, gold) Question a.There is ………….. between like charges.Answer:always repulsion Question b.…………. is responsible for generation of electric charge in an object.Answer:displacement … Read more

Textbook Questions and Answers 1. Fill ¡n the blanks with the proper words from the brackets.(stationary, zero, changing, constant, displacement, velocity, speed. acceleration, stationary but not zero. inc reuses) Question a.If a body traverses a distance in direct proportion to the time, the speed of the body is ……………… .Answer:constant Question b.If a body is … Read more

Textbook Questions and Answers 1. Write answers to the following questions in your own words: Question a.Why is the weight of the same object different on different planets?Answer:The weight of the same object is different on different planets because weight depends on the gravitational force of the planet and gravitational force on every planet is … Read more