Surface Tension MCQ. We covered all the Surface Tension MCQ in this post for free so that you can practice well for the exam.
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MCQ on Surface Tension for NEET Students
Which of these wires (same material) will have the largest extension when the same tension is applied?
(A) Length = 50 cm, diameter = 0.5 mm
(B) Length = 100 cm, diameter = 1 mm
(C) Length = 200 cm, diameter = 2 mm
(D) Length = 300 cm, diameter = 3 mm
Option a – Length = 50 cm, diameter = 0.5 mm
When a string is stretched by 0.5 cm, its potential energy is U. If the string is stretched by 3 cm, then its potential energy will be
(A) 4 U
(B) 8 U
(C) 36 U
(D) 32 U
Option c – 36 U
If the potential energy of a spring is V on stretching it by 4 cm, then its potential energy, when it is stretched by 20 cm will be
(A) V/25
(B) 5V
(C) V/5
(D) 25V
Option d – 25V
If the value of excess pressure in a soap bubble is four times that of another, then the ratio of their volumes will be
(A) 64 : 1
(B) 1 : 64
(C) 1 : 4
(D) 4 : 1
Option b – 1 : 64
A rope 1 cm in diameter breaks if the tension in it exceeds 1000 N. The maximum tension that may be given to a similar rope of diameter 2 cm is
(A) 4000 N
(B) 1000 N
(C) 500 N
(D) 250 N
Option a – 4000 N
If a stress of X kg-wt/m² is applied to a wire whose Young’s modulus is Y, then the percentage increase in its length is (g = 9.8 m/s²)
(A) 0.98X/Y
(B) 980X/Y
(C) 9.8X/Y
(D) 100X/Y
Option b – 980X/Y
The capillaries have radii in the ratio 3 : 2 : 1 respectively. The liquid in the beaker is water. The heights of the water levels in the capillaries are in the ratio
(A) 3 : 2 : 1
(B) 2 : 3 : 6
(C) 5 : 3 : 2
(D) 6 : 3 : 2
Option b – 2 : 3 : 6
Pressures inside two soap bubbles are 1.01 and 1.02 atmospheres respectively. The ratio of their volumes is
(A) 2 : 1
(B) 1 : 2
(C) 1 : 8
(D) 8 : 1
Option c – 1 : 8
An external force of 20 newtons acts normally on a square area of each side 50 cm. The stress produced in the equilibrium state is
(A) 10 N/m²
(B) 20 N/m²
(C) 80 N/m²
(D) 50 N/m²
Option c – 80 N/m²
When a wire undergoes a 100% increase in its length, Young’s modulus of wire numerically equals to
(A) 0
(B) 1
(C) strain
(D) stress
Option d – stress
A long spring is stretched by 4 cm and its potential energy is V. If the spring is stretched by 8 cm, its potential energy will be
(A) V
(B) 2 V
(C) 3 V
(D) 4 V
Option d – 4 V
If three identical mercury drops are combined to form a single drop, then its temperature will
(A) decrease.
(B) increase.
(C) remain the same.
(D) vary depending on the surrounding temperature.
Option b – increase.
Water rises to a height of 2 cm in a capillary tube. If the tube is tilted 30° from the vertical, water will rise in the tube to a length
(A) 2.3 cm
(B) 1.9 cm
(C) 2.9 cm
(D) water will not rise at all.
Option a – 2.3 cm
The coefficient of elasticity ……..
(A) increases with temperature
(B) decreases with temperature
(C) increases in reducing stress
(D) is independent of temperature
Option b – decreases with temperature
Mark the WRONG statement.
(A) The reciprocal of bulk modulus of elasticity is called compressibility.
(B) Sliding the molecular layer is much easier than compression or expansion.
(C) It is difficult to twist a long rod as compared to a small rod.
(D) A hollow shaft is much stronger than a solid shaft of the same dimensions
Option c – It is difficult to twist a long rod as compared to a small rod
If a spiral spring is stretched by applying a load to its free end, then the strain produced in the spring is ………
(A) volumetric
(B) shear
(C) longitudinal and shear
(D) longitudinal
Option d – longitudinal
Assertion: If the length of a rod becomes three times, the breaking load remains the same. Reason: Breaking load is equal to the elastic limit.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option c – The assertion is True, Reason is False.
Two wires, one of copper and the other of steel are of the same length and cross-section. They are welded together to form a long wire. On suspending, a weight at its one end, the increment in length is found to be 1.5 cm. If Young’s modulus of steel is double that of copper, the increment in steel wire will be
(A) 1 cm
(B) 0.5 cm
(C) 2 cm
(D) 2.5 cm
Option b – 0.5 cm
The maximum load a wire can withstand without breaking when its length is reduced to one-third of its original length, will
(A) be double.
(B) be half.
(C) be four times.
(D) remain same.
Option d – remain same.
When a uniform wire of radius r is stretched kg weight, the increase in its length is by 2 2.00 mm. If the radius of the wire changes to r/3 and other conditions remain the same, the increase in its length is
(A) 3.00 mm
(B) 9.00 mm
(C) 6.00 mm
(D) 18.00 mm
Option d – 18.00 mm
If there is no change in the volume of a wire due to a change in its length on stretching, then the Poisson’s ratio of the material of the wire is
(A) +0.50
(B) -0.50
(C) 0.25
(D) -0.25
Option b – -0.50
The upper end of a wire of radius 4 mm and length 120 cm is clamped, and its other end is twisted through an angle of 30°. Then the angle of the shear is
(A) 10°
(B) 1.0°
(C) 0.10°
(D) 0.010°
Option c – 0.10°
The ratio of the lengths of two wires A and B of the same material is 1 : 2 and the ratio of their diameters is 4 : 1. They are stretched by the same force, then the ratio of increase in length will be
(A) 32 : 1
(B) 1 : 8
(C) 1 : 32
(D) 8 : 1
Option c – 1 : 32
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