Science : Chapter 14 : Acids and Bases TEXTBOOK EXERCISES I. Choose the best answer. 1. Acids are ________ in taste. a) sour b) sweet c) bitter d) salty [Answer: (a) sour] 2. Aqueous solutions of _________ conduct electricity. a) acid b) base c) salt d) All of these  [Answer: All the above] 3. In acidic […]

Science : Chapter 13 : Water TEXTBOOK EXERCISES I. Choose the correct answer. 1. Water changes to ice at a) 0ºC b) 100ºC c) 102ºC d) 98ºC [Answer: (a) 0°C] 2. Solubility of carbon dioxide in water is high when the a) pressure is low b) pressure is high c) temperature is high d) None

Science : Chapter 12 : Atomic Structure TEXTBOOK EXERCISES 1. Choose the best answer. 1. The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of__________ a) reciprocal proportion b) definite proportion c) multiple proportion d) conservation of mass [Answer: (b) definite proportion] 2. Cathode rays are

Science : Chapter 11 : Air TEXTBOOK EXERCISES I. Choose the best answer. 1. Which of the following is true about oxygen? a) Completely burning gas b) Partially burning gas c) Doesn’t support burning d) Supports burning [Answer: (d) Supports burning] 2. Aerated water contains a) air b) oxygen c) carbon dioxide d) nitrogen [Answer:

Science : Chapter 10 : Changes Around Us TEXTBOOK EXERCISE  I. Choose the best answer. 1. Burning of paper is a __________ change. a) physical b) chemical c) physical and chemical d) neutral [Answer: (b) chemical] 2. Burning of matchstick is an example for chemical reaction caused by __________ a) contact in physical states b) electricity

Science : Chapter 9 : Matter Around Us TEXTBOOK EXERCISE I. Choose the best answer. 1. The liquid metal used in thermometers is a) copper  b) mercury  c) silver  d) gold [Answer: (b) Mercury] 2. The pictorial symbol for water given by the alchemists was [Answer: (c) ] 3. Which one of the following element name

Science : Chapter 8 : Universe and Space Science TEXTBOOK EXERCISES I. Choose the best answer. 1. Which of the following is a celestial body? a) Sun b) Moon c) Stars d) All the above [Answer: (d) All the above] 2. Mangalyaan was sent to ________ a) Moon b) Mars c) Venus d) Mercury  [Answer:

Science : Chapter 7 : Magnetism TEXTBOOK EXERCISES I. Choose the best answer. 1. A magnet attracts __________. a) wooden materials b) any metal c) copper d) iron and steel [Answer: (d) iron and steel] 2. One of the following is an example for a permanent magnet. a) Electromagnet  b) Mumetal c) Soft iron d) Neodymium

Science : Chapter 6 : Sound TEXTBOOK EXERCISES I. Choose the best answer. 1. Sound waves travel very fast in a. air b. metals c. vacuum d. liquids [Answer: (b) metals] 2. Which of the following are the characteristics of vibrations? i.  Frequency ii.  Time period iii.  Pitch iv.  Loudness a) i and ii b) ii

Science : Chapter 5 : Electricity TEXTBOOK EXERCISES I. Choose the best answer. 1. When an ebonite rod is rubbed with fur, the charge acquired by the fur is a. negative b. positive c. partly positive and partly negative d. None of these [Answer: (b) positive] 2. The electrification of two different bodies on rubbing is