[Important Q's] Class 6 Science Chapter 2 Sorting Materials into Groups Extra Questions.
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Most Important Extra Questions for class 6th science chapter 2 Sorting Materials into Groups.
# Class 6 Science Chapter 2 - Definitions :
Q. Define Transparent Substance.
Ans. The substances through which things can be seen are called transparent Substance.
E.g. Air, water, glass, some plastics, cellophane sheet, etc.
Q. Define Translucent Substance.
Ans. The substances through which things can be seen but not clearly are called translucent Substance.
E.g. Butter paper, oil patch on paper, etc.
Q. Define Opaque Substance.
Ans. The substances through which things cannot be seen are called opaque Substance.
E.g. Wood, book, metals, cardboard, etc.
Q. Define soluble substance
Ans. Those substance which completely dissolve or disappear in water to make a transparent liquid
are called soluble substances. Examples are sugar, common salt, alum, etc.
Q. Define insoluble substance
Ans. Those Substance which do not dissolve or disappear in water even after stirring for a long time are
called insoluble Substances. Examples are sand, chalk powder, flour, sawdust, etc.
Q. Define solubility.
Ans. The property of a substance to get dissolve in another substance is called its solubility.
Q. Define Solute.
Ans. A Solute is a substance that get dissolved in another substance.
Q. Define Solvent.
Ans. A Solvent is a Substance (liquid) that dissolves another substance (Solid, Liquid, Gas).
Q. Define Solution.
Ans. A Solution is the mixture of Solute and Solvent.
Q. Define solid.
Ans. Any material with a definite shape and volume is considered solid. For instance, boxes, stones, wood, and chairs.
Q. Define liquid.
Ans. Any material that does not have a definite shape but has a definite volume is referred to as a liquid. For instance, water, milk, and oil.
Q. Define gas.
Ans. Any material that has neither a definite shape nor a definite volume is referred to as a gas. For instance, oxygen, nitrogen, and hydrogen.
Q. Define Miscible liquid.
Ans. Those liquids which mix well with water are said to be miscible.
E.g. alcohol, vinegar, etc.
Q. Define Immiscible Liquids.
Ans. Those liquids which do not mix with water are said to be miscible.
E.g. Oil, Kerosene, Petrol, etc.
Q. Define Hard Materials
Ans. Those materials which cannot be easily compressed, cut, bent or scratched are called hard
materials. Examples: Iron, glass.
Q. Define Soft Materials
Ans. Those materials which can be easily compressed, cut, bent or scratched are called soft materials.
E.g. Sponge, Cotton.
Q. Define metals.
Ans. Metals are hard, shiny, and excellent electrical conductors. Copper, silver, gold, and other metals are examples of metals.
Q. Define non-metals.
Ans. Non-metals are fragile and do not conduct electricity well. They aren't really glossy. Coal and rubber are examples.
Class 6 Science Chapter 2 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 2 - Sorting Materials into Groups.
Which includes :-
# Class 6 Science Chapter 2 Explanation.
# Class 6 Science Chapter 2 Important Questions.
# Class 6 Science Chapter 2 - Very Short Answer Questions :
Q. Name two odorless and two fine smelling items in your house.
Ans.
Odorless : Air, Water, Cotton, etc.
Fine smelling : Perfume, Room freshers, etc.
Q. Name any three conductors of heat in house-hold items.
Ans. Immersion rod, geysers, heater, gas stove.
Q. Liquids which are soluble in water.
Ans. Miscible liquids
Q. Name three liquids that are not soluble in water.
Ans. Diesel, petrol and oil are not soluble in water.
Q. The hardest known Natural material.
Ans. Diamond
Q. Best conductor of heat.
Ans. Silver
Q. Material which catches fire.
Ans. Flammable
Q. Write two things made from leather.
Ans. Jacket, belt, shoes, bag (any two)
Q. Which material is generally used for making pens?
Ans. Plastic or metal.
Q. What is common between salt and sand?
Ans. They both have mass and are in solid state.
Q. List three liquids which are transparent.
Ans. Water, alcohol and Acetone/Benzene.
Q. Write two gases which are soluble in water.
Ans. Oxygen, Carbon dioxide.
Q. Name two gases which are insoluble in water.
Ans. Hydrogen and Nitrogen.
Q. Name a Metal that has lustre.
Ans. Silver
Q. Name a non-metal that has lustre.
Ans. Iodine.
Class 6 Science Chapter 2 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 2 - Sorting Materials into Groups.
Which includes :-
# Class 6 Science Chapter 2 Explanation.
# Class 6 Science Chapter 2 Important Questions.
# Class 6 Science Chapter 2 - Short Answer Questions :
Q. What do you understand by the word ‘classification’?
Ans. Classification means grouping the things on the basis of their similarities and Differences.
Q. What is the basis for sorting materials?
Ans. Materials are grouped on the basis of similarities or dissimilarities in their properties.
Q. Why we divide materials into groups.
Ans. Classification helps us identify the materials on the basis of similarities or differences of their properties. It also makes it easy to study the properties of a particular object of a particular category.
Q. Suggest two bases on which we can group objects.
Ans:
(i) Material used in making the object, e.g. wood or metal/plastic.
(ii) Material of the object is soft or hard, or substance is soluble or insoluble in water.
Q. Write any four properties of materials.
Ans:
(a) Appearance
(b) Hardness
(c) Solubility
(d) Float or sink in water
(e) Transparency
Q. Explain with example rough and smooth surfaces.
Ans. Materials which have uneven surface can be termed as a rough surface, e.g., coal, chalk, etc. On the other hand Materials which are plain and have an even surface are termed as a smooth surface, e.g., marble, glass, etc.
Q. What is the difference between transparent and translucent?
Ans. Those substances or material, through which things can be seen are called transparent. For example : water, glass etc. on the other hand the materials through which objects can be seen but not clearly are known as translucent. For example : oily patch on paper, butter paper.
Q. What are the similarities between iron, copper and aluminium?
Ans.
(a) They all have lustre,
(b) They are all metals,
(c) They are hard.
Q. Why is a tumbler not made with a piece of cloth?
Ans. We use tumblers made of glass, plastic and metal to keep a liquid because these materials can easily hold a liquid. but a tumbler made of cloth cannot hold a liquid because cloth has very minute pores through which the liquid oozes out.
Q. Metals have lustre (shine). Give reason why some metal articles become dull and loose their shine.
Ans. Metals when exposed to air react with moisture and gases present in it, thereby forming a dull layer of oxide or carbonate compound on it.
Q. Why do iron nail loose its lustre after keeping it for some days in open air?
Ans. Iron nail loose its lustre and appear dull because of action of air and moisture( Rusting of iron).
Q. Kerosene, coconut oil, mustard oil do not dissolve in water, even on shaking. They separate after sometime forming two different layer. Explain why.
Ans. The molecules of water do not intermingle (mix) with the molecules of oil. The space between the molecules of water is not taken by oil, so they are immiscible in water.
Q. Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of flower, soil, copper sulphate crystals, glucose, wheat flour are some substances given to Paheli. She wants to know whether these substances are soluble in water or not. Help her in identifying soluble and insoluble substances in water.
Ans.
Soluble in water : Sugar, Salt, Honey, Copper sulphate crystals, Glucose.
Insoluble in water : Mustard oil, Sand, Sawdust, Chalk powder, Soil, Petals of flower, Wheat flour.
Q. Metals generally occur in solid state and are hard. Name a metal that exists in liquid state and a metal that is soft and can be cut with knife.
Ans. Mercury is a metal that exists in liquid state. Sodium and Potassium are soft metals and can be cut with knife.
Q. Why Water is called a universal solvent.
Ans. Water is called a universal solvent because almost all the substances get dissolved in water.
Q. Why is water essential for our bodies?
Ans. Water is essential for our bodies because it can dissolve a good range of substances required by the body. It is also an important component of our body’s cells.
Q. When does pure water lose its transparency?
Ans. Pure water lose its transparency after cooling or freezing it to make ice which is not transparent.
Q. When you spray perfume its smell can be detected at a distance because.
Ans. Molecules of perfume mixes with air and spread at a distance. Hence we can smell the fragnance.
Q. Why do shopkeepers keep eatables like biscuits, sweets in transparent containers?
Ans. So that we can easily see inside the container and select our favourite sweets or biscuits.
Q. Why does a coin sink in water?
Ans. Object with higher density than water will sink. A coin is made up of metal. Density of metal is higher than water. That’s why coin sinks in water.
Q. How is the density of an object related to its floating or sinking?
Ans. An object will float only when its density will be less than the surrounding liquid and it will sink when its density will be greater than the surrounding liquid.
Q. Why do some substances sink while others float?
Ans. Substances with a relative density greater than water sink in water, whereas substances with a relative density less than water float on water.
Q. Mixtures of red chili powder in water, butter in water, petrol in water, and honey in water were given to Radha, Sudha, Sofia and Raveena, respectively. Whose mixture is in solution form?
Ans. Raveena has got a solution because honey will dissolve in water.
Q. In a blue-coloured solution of water and a dye, which is solvent and which is solute?
Ans. Dye is the solute and water is the solvent in the resulting solution.
Q. It was Paheli’s birthday. Her grandmother gave her two gifts made of metals, one old dull silver spoon and a pair of lustrous gold earrings. She was surprised to see the difference in the appearance of the two metals. Can you explain the reason for this difference?
Ans. The silver spoon on long exposure to moist air has lost its shine and appears dull whereas gold does not tarnish.
Q. On a bright sunny day, Shikha was playing hide and seek with her brother. She hid herself behind a glass door. Do you think her brother will be able to locate her. If yes, why? If no, why not?
Ans. Yes, Ground glass is translucent, so Shikha can be located.
Q. Take a small cotton ball and place it in a tumbler/bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?
Ans. Cotton ball initially floats and then sinks as it absorbs water.
Q. Which among the following materials would you identify as soft materials and why? Ice, rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked rice, pulses and fresh chapati.
Ans. Rubber band, leaf, eraser, cooked rice and fresh chapati are soft materials because they can be compressed or scratched easily
Q. Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties by which we can prove that these materials are different.
Ans. These materials are different on the basis of lustre, hardness, softness, roughness or smoothness.
Q. Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants?
Ans. Dissolved oxygen is available for animal and plants for respiration and survival.
Q. You are provided with the following materials— turmeric, honey, mustard oil, water, glucose, rice flour, groundnut oil. Make any three pairs of substances where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substances.
Ans.
Soluble
(i) honey in water
(ii) glucose in water
(iii) groundnut oil in mustard oil
Insoluble
(i) turmeric in water
(ii) rice flour in water
(iii) mustard oil in water
Class 6 Science Chapter 2 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 2 - Sorting Materials into Groups.
Which includes :-
# Class 6 Science Chapter 2 Explanation.
# Class 6 Science Chapter 2 Important Questions.
# Class 6 Science Chapter 2 - Long Answer Questions :
Q. Differentiate among opaque, translucent and transparent materials, giving one example of each.
Ans.
Transparent Substance : The substances through which things can be seen are called transparent Substance.
E.g. Air, water, glass, some plastics, cellophane sheet, etc.
Translucent Substance : The substances through which things can be seen but not clearly are called translucent Substance.
E.g. Butter paper, oil patch on paper, etc.
Opaque Substance : The substances through which things cannot be seen are called opaque Substance.
E.g. Wood, book, metals, cardboard, etc.
Q. Discuss important properties of materials that can be used to classify them.
Ans. The following are some important properties of matter:
(a) Appearance : Materials can be classified based on how they appear. The appearance of various materials varies.
(b) Lustre : The lustre of a material can be used to classify it. Some shine brightly, while others are rather dull.
(c) Solubility : Substances are classified as soluble or insoluble based on their solubility in water.
(d) Transparency : Transparent materials allow almost all light to pass through. Light cannot pass through opaque materials. Translucent materials allow some light to pass through.
(e) Density : It is defined as the mass per unit volume of a substance. Some substances float, and others sink in water or other liquids based on their density.
Q. Why is a tumbler not made with a piece of cloth?
Ans. We use tumblers made of glass, plastic and metal to keep a liquid. These substances can hold a liquid. A tumbler made of cloth cannot hold a liquid because :
(i) Cloth piece is not hard enough to hold liquids and
(ii) Cloth piece has very minute pores through which the liquid oozes out.
Q. Why is mercury used in making thermometers?
Ans. Mercury is used in making thermometers because :
(a) Mercury is liquid at room temperature.
(b) It is a good conductor of heat.
(c) Mercury has lustre, so, it is easy to read the temperature shown by the level of mercury.
Q. Name three states of matter and their characteristic properties?
Ans. The three States of matter are -
(a) Solid
(b) Liquid
(c) Gas
Characteristics of Solid, Liquid and gases are listed below :
Class 6 Science Chapter 2 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 2 - Sorting Materials into Groups.
Which includes :-
# Class 6 Science Chapter 2 Explanation.
# Class 6 Science Chapter 2 Important Questions.
# Class 6 Science Chapter 2 - Value Based Questions :
Q. Suhani saw her brother trying to touch a vessel of milk which her mother had just removed from the flame. She immediately went to him and stopped him from doing so.
a. Why do you think Suhani stopped her brother?
Ans. The vessel is made up of metal, which is good conductor of heat. She saved her brother from burning his hand as vessel must be hot.
b. Which moral value does Suhani display here?
Ans. Caring/loving and having scientific knowledge.
Q. Shreya while playing with her elder brother in the garden pool, observed that a wooden block sinks in water but a wooden plank of same weight floats on water. She was very astonished on seeing this. So, She asked Some Questions to her elder brother about it. Shreya's brother on seeing such question mark on her face explained the reason.
(a) Why the wooden plank floats on water while the wooden block sink in the water though both have same weight?
Ans. Volume of the wooden block is more than the wooden plank as weight of wooden plank is distributed to large area than the wooden block. So wooden plank floats while wooden block sinks.
(b) Why some substance float while other sink in water?
Ans. Substances that have density lower than water floats while substances that have density higher than water sinks in water.
(c) What is Density
Ans. Density is defines as mass per unit volume of a substance.
(d) What values of Shreya are shown here?
Ans. Shreya is curious, Keen observer and a learner.
Q. Nidhi and Riddhi, two friends, decided to open a new stationary store. They purchased a large number of materials from the main market. Nidhi systematically arranged all of the items based on their similarities and differences. The items were not arranged by Riddhi. She simply arranged them according to the available space in her shop.
(a) What is the purpose of grouping items?
Ans. Grouping items based on their similarities or differences makes it easier to locate objects.
(b) Assume you are a stationer; how will you arrange your products in your store?
Ans. As a stationer, I will group similar materials together, such as books, notebooks, and files, and separate dissimilar materials, such as separating books based on class and grade, and storing different brands of pens separately to keep them safer and easy to locate.
(c) Do you believe Nidhi or Riddhi will be able to easily locate items in their shop? Why?
Ans. Nidhi will be able to easily locate items in her shop because she has organised them systematically.
(d) What are the values of Nidhi and Riddhi shown here?
Ans. Riddhi appears careless, lazy, and inexperienced, whereas Nidhi appears active, professional, and intelligent.
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