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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
Among the following wires made of identical material, which one will undergo the greatest elongation under the same applied force?
(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
A string stretches by 0.5 cm and gains potential energy U. If it is instead stretched to 3 cm, what will be its new potential energy?
(A) 4 U
(B) 8 U
(C) 36 U
(D) 32 U
Option c – 36 U
If stretching a spring by 4 cm results in potential energy V, what is the potential energy when it is extended to 20 cm?
(A) V/25
(B) 5V
(C) V/5
(D) 25V
Option d – 25V
If the internal pressure of one soap bubble is four times that of another, what is the ratio of their volumes?
(A) 64 : 1
(B) 1 : 64
(C) 1 : 4
(D) 4 : 1
Option b – 1 : 64
A rope with a 1 cm diameter breaks at a tension of 1000 N. What is the maximum tension a rope with a 2 cm diameter (same material) can withstand?
(A) 4000 N
(B) 1000 N
(C) 500 N
(D) 250 N
Option a – 4000 N
A stress of X kgf/m² is applied to a wire with Young’s modulus Y. What is the percentage elongation in the wire? (Take g = 9.8 m/s²)
(A) 0.98X/Y
(B) 980X/Y
(C) 9.8X/Y
(D) 100X/Y
Option b – 980X/Y
Three capillary tubes have radii in the ratio 3 : 2 : 1. If water is the liquid used, what is the ratio of water heights in the tubes?
(A) 3 : 2 : 1
(B) 2 : 3 : 6
(C) 5 : 3 : 2
(D) 6 : 3 : 2
Option b – 2 : 3 : 6
Two soap bubbles have internal pressures of 1.01 atm and 1.02 atm respectively. What is the ratio of their volumes?
(A) 2 : 1
(B) 1 : 2
(C) 1 : 8
(D) 8 : 1
Option c – 1 : 8
A square surface with 50 cm sides is subjected to a perpendicular force of 20 N. What is the resulting stress on the surface?
(A) 10 N/m²
(B) 20 N/m²
(C) 80 N/m²
(D) 50 N/m²
Option c – 80 N/m²
A wire is stretched such that its length becomes twice its original. What does Young’s modulus numerically equal in this situation?
(A) 0
(B) 1
(C) strain
(D) stress
Option d – stress
A spring has potential energy V when extended by 4 cm. What will be the energy stored when it is stretched by 8 cm?
(A) V
(B) 2 V
(C) 3 V
(D) 4 V
Option d – 4 V
When three equal-sized mercury droplets merge into one, how does the temperature change?
(A) decreases
(B) increases
(C) remains unchanged
(D) depends on surrounding temperature
Option b – increases
Water climbs to 2 cm in a vertical capillary tube. If the tube is tilted 30° from the vertical, what will be the length of water column inside?
(A) 2.3 cm
(B) 1.9 cm
(C) 2.9 cm
(D) water won’t rise
Option a – 2.3 cm
How does the modulus of elasticity behave with temperature?
(A) increases with temperature
(B) decreases with temperature
(C) increases as stress decreases
(D) remains unaffected by temperature
Option b – decreases with temperature
Identify the incorrect statement.
(A) Compressibility is the reciprocal of bulk modulus
(B) Molecular layers slide more easily than compress or expand
(C) Twisting a long rod is harder than twisting a short one
(D) A hollow shaft is stronger than a solid shaft of the same size
Option c – Twisting a long rod is harder than twisting a short one
A spiral spring is pulled at its free end. What type of strain is produced in it?
(A) volumetric
(B) shear
(C) both longitudinal and shear
(D) longitudinal
Option d – longitudinal
Assertion: Increasing the length of a rod threefold does not alter its breaking load.
Reason: Breaking load equals the elastic limit.
(A) Both statements are true, and Reason correctly explains Assertion
(B) Both statements are true, but Reason does not explain Assertion
(C) Assertion is true, Reason is false
(D) Assertion is false, Reason is true
Option c – Assertion is true, Reason is false
A copper wire and a steel wire of equal length and cross-section are joined end-to-end. If the total elongation under load is 1.5 cm and steel’s Young’s modulus is twice that of copper, what is the elongation in the steel part?
(A) 1 cm
(B) 0.5 cm
(C) 2 cm
(D) 2.5 cm
Option b – 0.5 cm
A wire is shortened to one-third its original length. How does the maximum tension it can bear change?
(A) becomes twice
(B) becomes half
(C) becomes four times
(D) remains unchanged
Option d – remains unchanged
A wire of radius r stretches by 2.00 mm under a load. If its radius is reduced to r/3 under the same conditions, what will be the new extension?
(A) 3.00 mm
(B) 9.00 mm
(C) 6.00 mm
(D) 18.00 mm
Option d – 18.00 mm
If stretching a wire does not change its volume, what is the Poisson’s ratio of the material?
(A) +0.50
(B) -0.50
(C) 0.25
(D) -0.25
Option b – -0.50
A wire of radius 4 mm and length 120 cm is fixed at one end and twisted by 30°. What is the resulting shear angle?
(A) 10°
(B) 1.0°
(C) 0.10°
(D) 0.010°
Option c – 0.10°
Wire A and B have length ratio 1 : 2 and diameter ratio 4 : 1, made of the same material and subjected to the same load. What is the ratio of their elongations?
(A) 32 : 1
(B) 1 : 8
(C) 1 : 32
(D) 8 : 1
Option c – 1 : 32
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