Physics one-liners for various competitive examinations-July 4th, 2019
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1- The shape of a liquid drop is determined by- when there are no external forces.
(a) The temperature of air only
(b) Viscosity of liquid
(c) Density of liquid
(d) The surface tension of the liquid
2- Let us assume the surface of a liquid is plane, then the angle of contact of the liquid with the walls of the container is
(a) Obtuse angle
(b) Acute angle
3- If the angle of contact between a solid and a liquid is 90°, then
(a) Cohesive force < Adhesive force
(b) Cohesive force > Adhesive force
(c) Cohesive force >> Adhesive force
(d) Cohesive force = Adhesive force
4- This is not based on the principle of capillarity.
(a) Rise of oil in the wick of the lantern
(b) Soaking of ink by bloating paper
(c) Floating of wood on the water surface
(d) Plowing of soil
5- This is due to – factor, Raindrops are spherical in shape.
(a) Acceleration due to gravity
(b) Downward motion
(d) Surface tension
6- Due to which process, the Plants get water through the roots?
7- If common salt is dissolved in water, then the Surface Tension of salt water is
(c) First decreases and then increases
(d) Not Changed
8- In a fine capillary tube, the height of a liquid
(a) Increases as the effective value of acceleration due to gravity is decreased
(b) Decreases with an increase in the surface tension
(c) Decreases with a decrease in the diameter of the tube
(d) Increases with an increase in the density of a liquid
9- Define Surface tension.
(a) Free surface energy per unit volume
(b) The work done per unit area in increasing the surface is of a liquid under both isothermal and adiabatic conditions.
(c) The work done per unit area in increasing the surface area of a liquid under adiabatic condition
(d) The work done per unit area in increasing the surface area of a liquid under isothermal condition
10-The surface of the water in contact with glass wall is
(d) Both b and c
11- What will be the reaction when a soap bubble is charged
(a) It does not undergo any change in size
(b) It contracts
(c) It expands
(d) None of these
12- Meniscus of mercury in the capillary is-
13- Why Kerosene in the wick of lantern rises up?- Because of
(a) Of the surface tension of the oil
(b) Wick attracts the kerosene
(c) Of negligible viscosity
(d) The diffusion of the oil through the wick
14- The surface tension at the boiling point of water is-
(a) Is zero
(b) Is infinite
(c) Is maximum
(d) Is the same as that at room temperature
15- Excess pressure inside a soap bubble is-
(a) Directly proportional to square roots of its radius
(b) Independent of its radius
(c) Inversely proportional to its radius
(d) Directly proportional to its radius
1- Surface tension of the liquid
3- Cohesive force = Adhesive force
4- Floating of wood on the water surface
8- Increases as the effective value of acceleration due to gravity is decreased
9-The work done per unit area in increasing the surface area of a liquid under isothermal condition
11- It expands
13- Of the surface tension of the oil
14- Is zero
15- Inversely proportional to its radius
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