NCERT Exemplar Problems Class 9 Science – Structure of the Atom Question 1: Which of the following correctly represent the electronic distribution in the Mg atom? (a) 3, 8,1 (b) 2, 8, 2 (c) 1,8, 3 (d) 8, 2, 2 Answer: (b) Atomic number and the number of electrons in magnesium atom is 12.…
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NCERT Exemplar Problems Class 9 Science – Atoms and Molecules Question 1: Which of the following correctly represents 360 g of water? (i) 2 moles of H20 (ii) 20 moles of water (iii) 022 x 1023 molecules of water (iv) 12044 x 1025 molecules of water (a) only (i) (b) (i) and (iv) (c) (ii)…
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NCERT Exemplar Problems Class 9 Science – Is Matter Around us Pure Question 1: Which of the following statements are true for pure substances? (i) Pure substances contain only one kind of particles. (ii) Pure substances may be compounds or mixtures. (iii) Pure substances have the same composition throughout. (iv) Pure substances can be exemplified…
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NCERT Exemplar Problems Class 9 Science – Matter In Our Surroundings Question 1: Which one of the following sets of phenomena would increases on raising the temperature? (a) Diffusion, evaporation, compression of gases (b) Evaporation, compression of gases, solubility (c) Evaporation, diffusion, expansion of gases (d) Evaporation, solubility, diffusion, compression of gases Answer: (c)…
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NCERT Exemplar Problems Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations Chapter 2 Acids Bases and Salts Chapter 3 Metals and Non-metals Chapter 4 Carbon and its Compounds Chapter 5 Periodic Classification of Elements Chapter 6 Life Processes Chapter 7 Control and Coordination Chapter 8 How do Organisms Reproduce Chapter 9…
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NCERT Exemplar problems for Class 10 Science Chapter 16 Management of Natural Resources Short Answer Questions 1. List two advantages associated with water harvesting at the community level. Answer. Two advantages of water harvesting at the community level are: Water can be stored during rainy season and can be used when required. Groundwater level increases…
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NCERT Exemplar problems for Class 10 Science Chapter 15 Our Environment Short Answer Questions Question 1. Why is improper disposal of waste a curse to environment? Answer. Improper disposal of waste is a curse to environment because it pollutes the environment, air, water, soil and cause harmful effects on living organisms. For example, passage of…
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NCERT Exemplar Class 10 Science Chapter- 14 Sources of Energy Short Answer Type Questions 1 Why is there a need to harness non-conventional sources of energy? Give two main reasons. Answer. There is a need to harness non-conventional sources of energy because: (i) fossil fuels are limited sources and are depleting fast. (ii) burning of…
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NCERT Exemplar Class 10 Science Chapter-13Magnetic Effects of Electric Current Short Answer Type Questions 1.A magnetic compass needle is placed in the plane of paper near point A as shown in figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in…
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NCERT Exemplar Class 10 Science Chapter-12 Electricity Shod Answer Type Questions 1.Three 2 Ω resistors, A, B and C are connected as shown in figure. Each of them dissipates energy and can withstand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors. Answer. Here, P…
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