Physics A hydrogen balloon floats up because of The pressure inside the balloon is more than the pressure outside it Weight of the balloon is less than the weight of air displaced by it. Air pressure decreases with decrease in weight Air pressure decreases with decrease in height The pressure inside the balloon is more than the pressure outside it Weight of the balloon is less than the weight of air displaced by it. Air pressure decreases with decrease in weight Air pressure decreases with decrease in height ANSWER DOWNLOAD EXAMIANS APP
Physics It is easier to roll a barrel full of coal tar than to pull it because coal tar is a liquid and it flows in the barrel when it is rolled the full weight of the barrel comes into play when it is pulled more surface area of the barrel is in contact with the road when it is pulled the rolling friction is much less than the sliding friction coal tar is a liquid and it flows in the barrel when it is rolled the full weight of the barrel comes into play when it is pulled more surface area of the barrel is in contact with the road when it is pulled the rolling friction is much less than the sliding friction ANSWER DOWNLOAD EXAMIANS APP
Physics Speed of sound in air is unaffected by change in Temperature Pressure Humidity Volume Temperature Pressure Humidity Volume ANSWER DOWNLOAD EXAMIANS APP
Physics Holography is a technique of Recording a permanent three dimensional black and white photograph Recording a permanent three dimensional photograph of a given single colour or a multicolour Recording a permanent, sharp two diimensional black and white or multicolour photograph Recording a permanent three dimensional multicolour photograph Recording a permanent three dimensional black and white photograph Recording a permanent three dimensional photograph of a given single colour or a multicolour Recording a permanent, sharp two diimensional black and white or multicolour photograph Recording a permanent three dimensional multicolour photograph ANSWER DOWNLOAD EXAMIANS APP
Physics In which one of the following the phenomenon of total internal reflection of light is used ? Formation of mirage Twinkling of stars Working of binoculars Formation of rainbow Formation of mirage Twinkling of stars Working of binoculars Formation of rainbow ANSWER DOWNLOAD EXAMIANS APP
Physics Which of the following is not an aerosol? Mud Dust Fog Smoke Mud Dust Fog Smoke ANSWER DOWNLOAD EXAMIANS APP
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