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The MCQs below are drawn from the Physics subject category.
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141
An alloy of gold and copper weighs 0.2 kg in air and 0.188 kg in water. The densities of gold and copper are 18.3 × 10³ kg/m³ and 8.935 × 10³ kg/m³ respectively. The amount of gold in the alloy is
Physics studies matter, energy and their interactions, so it is a physical science rather than a social or biological science.
144
16. The surface area of a bubble increases four times when it rises from bottom to the top of a water tank. If the atmospheric pressure is 10 metre of water column, then the depth of water in the tank is
Poisson's ratio ranges between -1 and 0.5 for stable isotropic materials, so 0.7 is not a physically allowable value.
148
An iron bar of length L and having cross section A is heated from 0°C to 100°C. If this bar is so held that it is not permitted to expand or bend, the gigantic force that is developed is
Lift on a wing is commonly explained by pressure differences produced by varying flow speed over and under the wing, described by Bernoulli's principle.
