Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion
Last Answer : (1) is a bad conductor of heat so only inner surface expands Explanation: When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion
Last Answer : is a bad conductor of heat so only inner surface expands
Description : Why does a thick glass tumbler crack when boiling hot water is poured into it?
Last Answer : Matter expands when it is heated. When you pour boiling waterinto a glass the bottom becomes heated and expands while the restof the glass is at a different temperature. As the ... expand evenly, preventing that stress from happening. Slow andeven temperature changes will prevent the breaking.
Description : Why does an ordinary glass tumbler crack when very hot tea or milk is poured in it?
Last Answer : Answer: When a hot liquid is poured into a tumbler, the inner layer of the tumbler gets heated, it expands before the outer layer and an unequal expansion of both layers causes the tumbler to crack.
Description : Hot coffee is poured simultaneously in four metallic tumblers painted outside with different types of paints. After some time, the coffee will be found coldest in the tumbler painted (a) rough white (b) shining white (c) rough black (d) shining black
Last Answer : Ans:(c)
Description : When hot-water is sprinkled on a hotter glass tumbler, it breaks because – (1) glass suddenly expands (2) glass suddenly contracts (3) water evaporates (4) glass reacts chemically with water
Last Answer : (2) glass suddenly contracts Explanation: If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
Description : When hot-water is sprinkled on a hotter glass tumbler, it breaks because (1) glass suddenly expands (2) glass suddenly contracts (3) water evaporates (4) glass reacts chemically with water
Last Answer : glass suddenly contracts
Description : Water on heating from 1 to 4°C (A) Contracts (B) Expands (C) Has same volume (D) May contract or expand
Last Answer : (A) Contracts
Description : When water is filled in a bottle and is allowed to freeze, the bottle breaks because A. Water expands on freezing (Answer) B. Bottle contracts at freezing point C. temperature outside the bottle is less than that inside the bottle. D. None of the above
Last Answer : A. Water expands on freezing (Answer)
Description : Pipelines in cold countries often burst in winter, because – (1) Water freezes and expands in its volume (2) Temperature of ice is less than that of water (3) Pipelines contract in their volume (4) Pipelines expand due to freezing
Last Answer : (1) Water freezes and expands in its volume Explanation: Water expands on freezing. When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees ... it expands by approximately 9%. The fact that water expands upon freezing causes icebergs to float.
Description : Pipelines in cold countries often burst in winter, because (1) water freezes and expands in its volume (2) temperature of ice is less than that of water (3) pipelines contract in their volume (4) pipelines expand due to freezing
Last Answer : water freezes and expands in its volume
Description : When water is filled in a bottle and is allowed to freeze, the bottle breaks because _____? A. Water expands on freezing B. Bottle contracts at freezing point C. Temperature outside the bottle is less than that inside the bottle D. None of them
Last Answer : ANSWER: A
Description : If boiling water is poured into a thick drinking glass as well as a very thin wine glass, of the two, which is more likely to crack? -Riddles
Last Answer : The thick glass is more likely to crack since glass is a poor conductor of heat. In a thin glass, the heat passes more quickly from the glass into the surrounding air, causing the glass to expand ... but the outer surface does not. It is this extreme stress on the glass that causes it to crack.
Description : Drinks remain hot or cold for a long time in a thermos flask because of the (a) presence of air, which is a bad conductor of heat, in between the double walls (b) silver coating on the inside of the double walls (c) vacuum between the double walls (d) combined effects of (b) and (c)
Last Answer : Ans:(d)
Description : Why does moisture gather outside a tumbler containing cold water?
Last Answer : Answer: The water vapour in the air condenses on cooling and appears as droplets of water.
Description : Why when water in the crack in rocks freezes and expand?
Last Answer : Water will expand when heated. It it will also expand when frozen. Water seeping into narrow cracks in rock, could, when becoming frozen in winter, expand and force the narrow crack to become wider.
Description : What is the nature of interference pattern for thin film of wedge shaped (a) Concave outside (b) Convex outside (b) Equally spaced (d) Concave inside
Last Answer : (b) Convex outside
Description : What is the nature of interference pattern for thin film of wedge shaped A. Concave outside B. Convex outside C. Equally spaced D. Concave inside
Last Answer : B. Convex outside
Description : Outside of cooking utensils are generally left black from below because – (1) it is difficult to clean daily. (2) black surface is a good conductor of heat. (3) black surface is a poor conductor of heat. (4) black surface is a good absorber of heat.
Last Answer : (4) black surface is a good absorber of heat. Explanation: The outside surface of a utensil used for heating is coated black so that it may absorb more heat and make heating quicker. This is because black surface is a good absorber of heat.
Description : Outside of cooking utensils are generally left black from below because (1) it is difficult to clean daily. (2) black surface is a good conductor of heat. (3) black surface is a poor conductor of heat. (4) black surface is a good absorber of heat.
Last Answer : black surface is a good absorber of heat.
Description : In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred (A) Through a metallic wall (B) By direct contact of hot flue gas with air (C) By ... material (like chequor bricks) and then heating the air from this hot material (D) None of these
Last Answer : (C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
Description : Water pipes in hilly areas often burst on a cold frosty night, because – (1) The material of which pipes are made contracts due to cold and so breaks (2) Water in the pipes freezes and on freezing water expands, so pipes break (3) Frost makes the pipes rusty, so they break (4) None of these
Last Answer : (2) Water in the pipes freezes and on freezing water expands, so pipes break Explanation: The temperature may fall below 0° C during cold frosty nights which converts the water inside the pipes into ice, ... in an increase in volume. This exerts great force on the pipes and as a result, they burst.
Description : Water pipes in hilly areas often burst on a cold frosty night, because (1) the material of which pipes are made contracts due to cold and so breaks (2) water in the pipes freezes and on freezing water expands, so pipes break (3) frost makes the pipes rusty, so they break (4) None of these
Last Answer : water in the pipes freezes and on freezing water expands, so pipes break
Description : Once a cup of hot coffee is poured how soon should you finish it?
Last Answer : Before the milk you put into it turns sour.
Description : What do you think should be the punishment for the "Hot Sauce Mom" who poured hot sauce in her 7 year old son's mouth and put him in a cold shower?
Last Answer : Someone larger, stronger, and in a position of authority over her should pour hot sauce into her mouth and scream in her face while she’s in a cold shower. Poetic justice.
Description : What would happen to plate poured with agar that is too hot or cool?
Last Answer : We Wouldn't Survive
Description : On placing an inverted tumbler over a burning candle, the flame extinguishes after some – time . This is because of non –availability of a) oxygen b)water vapour c)carbon dioxide d)wax
Last Answer : a) oxygen
Description : Fish can survive inside a frozen lake because (a) fish are warm blooded animals (b) fish hibernate in ice (c) water near the bottom does not freeze (d) ice is a good conductor of heat
Description : Which variety of glass is heat resistant? A. Bottle glass B. Flint glass C. Hard glass D. Pyrex glass (Answer)
Last Answer : D. Pyrex glass (Answer)
Description : Which variety of glass is heat resistant? (1) Hard glass (2) Flint glass (3) Pyrex glass (4) Bottle glas
Last Answer : (3) Pyrex glass Explanation: Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass.
Description : __________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant. (A) Pyrex (B) Soda lime (C) Lead (D) High silica
Last Answer : (A) Pyrex
Description : Heat resistant variety of glass is— (1) Pyrex glass (2) Hard glass (3) Flint glass (4) None of these
Last Answer : Flint glass
Description : Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l'. If the wall temperature ... wall temperature in degree centigrade? (A) 35.5 (B) 43.75 (C) 81.25 (D) 48.25
Last Answer : (C) 81.25
Description : A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place (A) The better insulation material should be put just ... to which insulating material is to be put inside (i.e., just next to the pipe)
Last Answer : (A) The better insulation material should be put just next to pipe (i.e., inside)
Description : Which group forms the strongest H-bonds to water molecules? (a) Alcohols (b) Ethers (c) Phenols (d) All equally strong
Last Answer : Phenols
Description : Electric field will be maximum outside the conductor and magnetic field will be maximum inside the conductor. State True/False. a) True b) False
Last Answer : a) True
Description : In a charged hollow metal conductor, the charge is w) on the inside surface only x) on both the inside and outside surfaces y) on the outside surface only z) only between the inside and outside surfaces
Last Answer : ANSWER: Y -- ON THE OUTSIDE SURFACE ONLY
Description : Sudden temperature fluctuation does not affect pyrex glass, because of its (A) Low co-efficient of expansion (B) High co-efficient of expansion (C) High melting point (D) Both (B) and (C)
Last Answer : (A) Low co-efficient of expansion
Description : The first step in the generation of a sea breeze is . (a) air over land expands and builds a pressure gradient at the surface that pushes air offshore (b) air over land expands and builds ... forms a cloud (d) air over land expands and builds a pressure gradient aloft that pushes air offshore
Last Answer : air over land expands and builds a pressure gradient aloft that pushes air offshore
Description : I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I? -Riddles
Last Answer : I'm Water.
Description : I'm gentle enough to soothe your skin, light enough to fly in the sky and strong enough to crack rocks. What am I? -Riddles
Last Answer : Water.
Description : I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
Last Answer : Water
Description : Standard coarse threads are equally strong in failure by shear and failure by tension, if the height of nut is (A) h = 0.4 d (B) h = 0.6 d (C) h = 0.5 d (D) h = d
Last Answer : (A) h = 0.4 d
Description : The areas of cross-section of a square beam and a circular beam subjected to equal bending moments, are same. (A) Circular beam is more economical (B) Square beam is more economical (C) Both the beams are equally strong (D) Both the beams are equally economical
Last Answer : (B) Square beam is more economical
Description : Pick up the correct statement from the following: (A) Plain cement concrete is equally strong in compression as well as in tension (B) Slump test is performed to check concrete strength (C ... D) Fineness modulus is the index number expressing the relative sizes of both coarse and fine aggregates
Last Answer : Option D
Description : Reinforced cement concrete is equally strong in taking (a) Tensile and compressive stress (b) Compressive and shear stresses. (c) Tensile, compressive and shear stresses. (d) Tensile and shear stresses.
Last Answer : (c) Tensile, compressive and shear stresses.
Description : Take a 250 mL beaker/glass tumbler. Fill half of it with water. Now carefully cut a small piece of sodium metal. Dry it using filter paper and wrap it in a small piece of cotton. Put the sodium piece wrapped in cotton into the beaker. Observe carefully. -Science
Last Answer : On touching the beaker, it was felt hot. The solution turns the red litmus paper to blue which shows it is basic in nature. Blue litmus paper do not show any colour change with the solution.
Description : A student sets up an expirment on photoysthesis as folows : He takes soda water in a glass tumbler and adds chloroplyll into the contents and keeps th
Last Answer : A student sets up an expirment on photoysthesis as folows : He takes soda water in a ... because intact chloroplasts are needed for the process.
Description : A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons. (A) Lack of free (B) Excess of (C) Decrease in (D) None of these
Last Answer : (B) Excess of