HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Physics

A liquid rises to a height of 5 cm in a glass capillary tube of radius 0.02 cm. The height to which the liquid would rise in a glass capillary tube of radius 0.04 cm is ______.

What is the excess of pressure inside a soap bubble of radius 3 cm if the surface tension of the soap solution is 30 dyne/cm?

A steel blade floats on the surface of pure water. When detergent is added, it sinks, why? What is capillarity?

Absorption of water by filter paper is due to ______.

A conductor carrying a current I has three segments, as shown in figure. What is the magnetic field B at the centre of curvature C of the semicircle?

A capillary tube of radius 1 mm is immersed in a beaker of mercury. The mercury level inside the tube is found to be 0.536 cm below the level in the reservoir. Determine the angle of contact between the mercury and glass. (Given: T = 0.485 N/m, p = 13.6 x 10³ kg/m³)

Compare streamline flow and Turbulent flow.

Multiple Choice Question.

Two hailstones with radii in the ratio of 1:4 fall from a great height through the atmosphere. Then the ratio of their terminal velocities is

Why does velocity increase when water flowing in broader pipe enters a narrow pipe?

With what terminal velocity will an air bubble 0.4 mm in diameter rise in a liquid of viscosity 0.1 Ns/m² and specific gravity 0.9? Density of air is 1.29 kg/m³.

Calculate the viscous force acting on a raindrop of diameter 1 mm, falling with a uniform velocity of 2 m/s through air. The coefficient of viscosity of air is 1.8 × 10^-5 Ns/m².

A horizontal force of 1 N is required to move a metal plate of area 10^-2 m² with a velocity of 2 × 10^-2 m/s, when it rests on a layer of oil 1.5 × 10^-3 m thick. Find the coefficient of viscosity of oil.

Two stones with radii 1:2 fall from a great height through the atmosphere. Their terminal velocities are in the ratio ______ 

What is the net weight of a body when it falls with terminal velocity through a viscous medium?

A square metal plate of area 100 cm² moves parallel to another plate with a velocity of 10 cm/s, both plates immersed in water. If the viscous force is 200 dyne and the viscosity of water is 0.01 poise, what is the distance between them?   

The relative velocity between two parallel layers of water is 8 cm/s and the perpendicular distance between them is 0.1 cm. Calculate the velocity gradient. 

A raindrop of radius 0.3 mm falls through the air with a terminal velocity of 1 m/s. The viscosity of air is 18 x 10⁻⁶ Ns /m². Find the viscous force on the raindrop.  

State the formula for critical velocity in terms of Reynold's number for a flow of a fluid.

What are the two main causes of turbulent flow?

Define the coefficient of viscosity.