WBCS Physics Optional Question Paper. We covered all the WBCS Physics Optional Question Paper in this post for free so that you can practice well for the exam.
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WBCS Physics Quiz Questions for Students
One end of a towel dips into a bucket full of water and the other end hangs over the bucket. It is found that after some time the towel becomes wet. It happens :
(A) Because the viscosity of water is high
(B) Because of the capillary action of cotton threads
(C) Because of gravitational force
(D) Because of the evaporation of water
Option b – Because of the capillary action of cotton threads
In a surface tension experiment with a capillary tube, the water rises up to 0.1 m. If the same experiment is repeated in an artificial satellite which is revolving around the earth, water will rise in the capillary tube up to a height of. :
(A) 0.1 m
(B) 0.2 m
(C) 0.98 m
(D) Full length of the tube
Option d – Full length of the tube
The excess pressure inside a drop or bubble is :
(A) Directly proportional to the mass
(B) Directly proportional to its radius
(C) Inversely proportional to its radius
(D) Inversely proportional to its surface tension
Option c – Inversely proportional to its radius
Two capillary tubes of different diameters are dipped in water. The rise of water is :
(A) Greater in tubes of smaller diameter
(B) Greater in tubes of larger diameter
(C) Same in both
(D) Zero in both
Option a – Greater in tubes of smaller diameter
Water rises to a height of 16.3 cm in a capillary of height 18 cm. If the tube is cut at a height of 12 cm :
(A) Water will come as a fountain from the capillary
(B) Water will stay at a height of 12 cm in the capillary tube
(C) The height of water in the tube will be 10.3 cm
(D) Water will flow down the sides of the capillary tube
Option b – Water will stay at a height of 12 cm in the capillary tube
A capillary is dipped vertically in a liquid. The level in the capillary will be the same as outside the capillary if the angle of contact is :
(A) Zero
(B) 90°
(C) Acute
(D) obtuse
Option b – 90°
Water from inside the earth rises through the trunk of a big tree to leaves high up. The main reason for this is :
(A) Capillary action
(B) High viscosity of water
(C) Gravitational force
(D) Evaporation of water
Option a – Capillary action
Two soap bubbles of different radii are in communication with each other. :
(A) Air flows from the larger bubble into the smaller one until the two bubbles are of equal size
(B) The size of the bubbles remains the same.
(C) Air flows from the smaller bubble into the larger one and the larger bubble grows at the expense of the smaller one
(D) Air flows from the larger bubble into the smaller one and the smaller bubble grows at the expense of the larger one
Option c – Air flows from the smaller bubble into the larger one and the larger bubble grows at the expense of the smaller one
The quantity on which the rise of liquid in a capillary tube does not depend is :
(A) Density of the liquid
(B) Atmospheric pressure
(C) Radius of the capillary
(D) Angle of contact
Option b – Atmospheric pressure
If two identical mercury drops are combined to form a single drop, then its temperature will :
(A) Decrease
(B) Increase
(C) Remains the same
(D) Increase or decrease
Option b – Increase
The angle of contact between glass and mercury is :
(A) 0°
(B) 30°
(C) 90°
(D) 135°
Option d – 135°
The angle of contact is :
(A) Constant for a particularly solid and liquid pair
(B) Acute for mercury and glass
(C) Obtuse for water and glass
(D) Obtuse for kerosine and glass
Option a – Constant for a particularly solid and liquid pair
For mercury and glass pair if Fc and FA are cohesive and adhesive forces then :
(A) FC < FA
(B) FC > FA
(C) FC = FA
(D) Not certain
Option b – FC > FA
If we draw a graph between the height of liquid in a capillary tube against the reciprocal of the radius of the tube for a given liquid then we get :
(A) A straight line
(B) Hyperbola
(C) Circle
(D) Parabola
Option a – A straight line
The pressure just below the meniscus of water :
(A) Is greater than just above it
(B) Is less than just above it
(C) Is the same as just above it
(D) Is always equal to atmospheric pressure
Option b – Is less than just above it
We covered all the wbcs physics optional question paper above in this post for free so that you can practice well for the exam.
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