MCQ 11 MarkA bimetallic strip is used in :Apressure cooker✓automatic fire alarmCceiling fanDflash lightAnswerCorrect option: B. automatic fire alarmBView full question & answer→
MCQ 21 MarkSmall gaps are left between railway lines because :Awe cannot have rails of very long length✓it allows for expansion of rails during summerCit allows for contraction of rails during summerDboth (b) and ( C)AnswerCorrect option: B. it allows for expansion of rails during summerBView full question & answer→
MCQ 31 MarkA bimetallic strip of brass and iron is straight at room temperature. When this bimetallic strip is heated it bands, such that:Airon takes the outer surface of bend✓brass takes the outer surface of bendCthe bimetallic strip does not bendDnone of theseAnswerCorrect option: B. brass takes the outer surface of bendBView full question & answer→
MCQ 41 MarkA thick glass tumble cracks when boiling hot water is poured into it because :Aglass is a bad conductor of heat✓inner surface of glass expands more than outer surfaceCouter surface of glass expands more than inner surfaceDboth (a) and (b)AnswerCorrect option: B. inner surface of glass expands more than outer surfaceBView full question & answer→