Question 11 MarkNeither conduction nor convection of the heat occurs in thermos flask due to the ……………… .Answervacuum.View full question & answer→
Question 21 Mark………………. made first thermos flask in 1892.AnswerSir James DewarView full question & answer→
Question 31 MarkCopper is a better ………… of heat than …………. .Answerconductor, ironView full question & answer→
Question 41 MarkSubstances through which heat travels very slowly are called ………… of heat.Answerbad conductorsView full question & answer→
Question 51 MarkSubstances through which heat travels easily and quickly are called …………… .Answergood conductorsView full question & answer→
Question 61 MarkTransfer of heat in the absence of a medium is called ……………… .AnswerradiationView full question & answer→
Question 81 MarkThe ………………. of conduction of heat through a medium depends on the medium.AnswerspeedView full question & answer→
Question 91 MarkA …………….. is necessary for the conduction of heat.AnswermediumView full question & answer→
Question 101 MarkIn a convection current, warm air travels …………….. .AnswerupwardsView full question & answer→
Question 111 MarkDuring conduction, particles of the substance …………….. in their place.AnswervibrateView full question & answer→
Question 121 MarkTransfer of heat from one place to another takes place by ……………. or ……………. .Answerconduction, convection, radiationView full question & answer→
Question 131 Mark………………. flows from higher temperature to lower temperature.AnswerHeatView full question & answer→
Question 141 Mark………………… is an indicator of the heat in a substance.AnswerTemperatureView full question & answer→
Question 151 MarkThe earth receives heat from the sun by ………………. .AnswerradiationView full question & answer→
Question 161 MarkCooking utensils are made from metals due to their property of ……………… .AnswerconductionView full question & answer→
Question 171 MarkThe shining surface in a thermos flask decreases the outgoing heat by ……………… .AnswerreflectionView full question & answer→
Question 181 MarkConduction of heat takes place through a ……………. substance.AnswersolidView full question & answer→
Question 191 Mark……………. of heat does not require a medium.AnswerRadiationView full question & answer→
Question 201 MarkMaximum heat is absorbed by a ………….. coloured object.AnswerblackView full question & answer→