Practice Physical properties of materials - general science mcq Online Quiz (set-2) For All Competitive Exams
Q-1) An ice cube is floating in a glass of water. What happens to the water level when the ice melts? It
(a)
(b)
(c)
(d)
Q-2) Which of the following materials is most elastic ?
(a)
(b)
(c)
(d)
Q-3) The bulk modulus for an incompressible liquid is
(a)
(b)
(c)
(d)
Bulk modulus = $\text"Pressure"/\text" Volume Strain" =\text"Pressure"/0$
Bulk modulus = ∞
[As liquid is uncompressible, ΔV=0 ]
Q-4) 200 gm of water is filled in a weightless balloon. Its weight in water will be
(a)
(b)
(c)
(d)
Q-5) Increasing the amount of a substance does not change its
(a)
(b)
(c)
(d)
Q-6) If the force on the surface is doubled and area is reduced to half, pressure will
(a)
(b)
(c)
(d)
Q-7) Spherical form of raindrop is due to
(a)
(b)
(c)
(d)
Q-8) An iron needle floats on the surface of water due to
(a)
(b)
(c)
(d)
Q-9) Working of atomizer is based on
(a)
(b)
(c)
(d)
Q-10) Kerosene oil rises up in a wick of a lantern because of
(a)
(b)
(c)
(d)
Q-11) Why it is easier to swim in the sea than in a river?
(a)
(b)
(c)
(d)
Q-12) Houses far from the municipal water tank find it difficult to get water on the top floor even if their ceilings are lower than the level of water filled in tank. Its reason is
(a)
(b)
(c)
(d)
Q-13) Fish can survive in a frozen lake because
(a)
(b)
(c)
(d)
Q-14) The size of the Respirable Suspended Particulate Matter (R.S.P.M.) in air is
(a)
(b)
(c)
(d)
Q-15) Paint-gun is based on
(a)
(b)
(c)
(d)
Q-16) The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?
(a)
(b)
(c)
(d)
Y=$\text"T/A"/\text"Δl/l"$
$Δl={T×l}/{A×Y}=T/Y×l/A$
Hence, $T/Y$ is constant. Therefore, $Δl = l/A$
$l/A$ is the largest in the first case.
Q-17) Surface tension of a liquid is due to
(a)
(b)
(c)
(d)
Surface tension of a liquid is due to force of attraction between like molecules of a liquid i.e. cohesive force between the molecules.
Q-18) Four wires of same material and dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?
(a)
(b)
(c)
(d)
Q-19) Two pieces of metal when immersed in a liquid have equal upthrust on them; then
(a)
(b)
(c)
(d)
Q-20) Why the dam of water reservoir is thick at the bottom?
(a)
(b)
(c)
(d)
A torque is acting on the wall of the dam trying to make it topple. The bottom is made very broad so that the dam will be stable.