Ncert – class 6- science – Chapter 2: Sorting Materials and Groups-2 Welcome to your Ncert - class 6- science - Chapter 2: Sorting Materials and Groups-2 1. Which of the following gases is important for aquatic animals? Carbon dioxide Nitrogen Oxygen Ammonia None 2. Which of the following statements is/are incorrect?a. Iodine crystals have lustre.b. All metals have a silvery white lustre.c. Gases are non-lustrous. Only c Both a and c Only b Both a and b None 3. Shreya is provided with the following objects and asked to put them in a bucket containing water.Wooden toy, iron nail, stone, plant leaf, and plastic ballWhich among the given objects will float and which will sink in water? Iron nail and plastic ball will float, whereas wooden toy and stone will sink. Wooden toy and iron nail will float, whereas stone, plant leaf and plastic ball will sink. Plant leaf will float, whereas wooden toy, iron nail and plastic ball will sink. Wooden toy, plant leaf and plastic ball will float, whereas iron nail and stone will sink. None 4. Which of the following statements is incorrect? Vinegar dissolves in water. Oil mixes well with water. Sand settles down in water. Sugar and water make a transparent solution None 5. Transparent substances: do not allow light to pass through them. allow light to pass through them. absorb all the light incident on them allow light to pass through them only partially. None 6. Which of the following can be classified as hot, luminous and naturally occurring object(s)? Stars Planet Moon Diamond None 7. Which of the following substances is commonly used for making tumblers, toys, pens and pipes? Metal Wood Plastic Glass None 8. Which of the following properties of gases makes water a vital component for aquatic animals? Transparency Diffusion Solubility Conductivity None 9. In which of the following sets are the materials liquid under ordinary conditions? Milk, water, kerosene Salt, sugar, cork Mercury, iron, gold Oxygen, nitrogen, sulphur None 10. Which of the following statements is/are true?a. Metals lose their luster gradually when exposed to air and moisture for long time. b. Stone is a transparent material.c. Ice sinks in water. Both b and c Only c Only b Only a None 11. Silver metal is silvery-white in colour. When exposed to air, the moisture and the atmospheric gases react with it and corrode it. The colour of the corroded metal surface is blue Yellow Black green None 12. Which of the following objects do not sink in water? Coin and key Pencil and stone Leaf and ice Silver ring and gold chain None 13. You are provided with the following materials. Magnifying glassMirrorStainless steel plateGlass tumblerWhich of the above materials will you identify as transparent? (i) and (ii) (i) and (iii) (i) and (iv) (iii) and (iv) None 14. Lustre is the property of a material to shine when it is freshly cut or sand-papered. Which of the following freshly sand-papered surfaces will have lustre? Plastic Cardboard Wood Copper None 15. Pick one material which is completely soluble in water: sawdust mud oil alum None 16. Which of the following statements is/are correct?a. Rubber is a bad conductor of electricity.b. Ice floats on oil.c. Wax floats on oil. Only c Both b and c Both c and a Both a and b None 17. Arrange the following materials in the decreasing order of their compressibility and choose the correct option.Iron, candle, gold, chalk, sponge, cotton Gold, sponge, sotton, shalk, iron, candle Candle, chalk, sponge, cotton, iron, gold Iron, gold, chalk, candle, cotton, sponge Cotton, sponge, candle, chalk, gold, iron None 18. Milk and water: mix with each other and so, they are immiscible liquids do not mix with each other and so, they are miscible liquids none of the above mix with each other and so, they are miscible liquids None 19. Substances lighter than water float on it whereas those heavier than it sink in it. Which of the following substances is heavier than water and sinks in it? Ice Wax Kerosene oil Chalk powder None 20. Some gases are soluble in water. Which of the following gases is soluble in water, and in the dissolved state, is used by the aquatic plants to prepare their food? Oxygen Carbon dioxide Hydrogen Nitrogen None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
