ExercisesLET'S UNDERSTANDA. Objective type questions1Choose the correct option.1Which of these is a reversible change?(a) Dough to chapattis(b) Burning of candle(d) Melting of kulf(c) Rice grains to cooked rice2.Which of these is an irreversible change?(b) Freezing of water(d) Burnins of paper(a) Melting of wax(c) Boiling of waterBaking a cake is an example of3.(a) physical change(c) chemical changeThe order of expansion in solid, liquid, and gas(a) solid > liquid gas(c) solid > gas > liquidExpansion gaps are kept in railway tracks because of(a) expansion of rails in hot weather (b) contraction of rails in hot(c) expansion of rails in cold weather (d) contraction of rails in o(b) irreversible change(d) both (b) and (c)4.(b) solid < liquid < gas(d) solid < gas < liquid5.weatherold weatherIl. Fill in the blanks with the correct words.1. Melting of ice-cream is an example of a/an(reversibleirreversible) change(reversible/irreversible) change2. Ripening of fruits is an example of a/an3. Cooking of food is an example of4. Breaking of glass is aa/an(reversible/irreversible) change(physical/chemical) change(Heating/Cooling) causes steam to change into waterB. Very short answer questionsWrite one word for the following.1.2.3.4.I.A change that can be reversedA change that cannot be reversedA change where no new substance is formedA change where a new substance is formedil. Identify the changes that occur when the following happen.1. Freezing of water2. Making curd from milk3. Boiling an egg4. Melting of butter5. Tearing of paper