Properties Of Bulk Matter PYQs

Let a wire be suspended from the ceiling (rigid support) and stretched by a weight W attached at its free end. The longitudinal stress at any point of cross-sectional area A of the wire is :

The amount of energy required to form a soap bubble of radius 2 cm from a soap solution is nearly : (surface tension of soap solution = 0.03 $N m^−1$)

The venturi-meter works on :

If a soap bubble expands, the pressure inside the bubble:

A spherical ball is dropped in a long column of highly viscous liquid. The curve in the graph shown, which represents the speed of the ball (v) as a function of time (t), is:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The stretching of a spring is determined by the shear modulus of the material of the spring. Reason (R): A coil spring of copper has more tensile strength than a steel spring of same dimensions. In the light of the above statements, choose the most appropriate answer from the options given below.

The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerin becomes constant after some time. If the density of glycerin is d/2, then the viscous force acting on the ball will be

A cup of coffee cools from $90^\circ C$ to $80^\circ C$ in $t$ minutes, when the room temperature is $20^\circ C$. The time taken by a similar cup of coffee to cool from $80^\circ C$ to $60^\circ C$ at the same room temperature of $20^\circ C$ is:

Which one among the following is the correct option for right relationship between $C_p$ and $C_v$ for one mole of ideal gas?

A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L₁ when mass M is suspended from its free end. The expression for Young’s modulus is:

A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is:

A U-tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of $10\ \text{mm}$ above the water level on the other side. Meanwhile the water rises by $65\ \text{mm}$ from its original level (see diagram). The density of the oil is