Embibe Experts Solutions for Chapter: Properties of Bulk Matter, Exercise 1: NEET - 17th July 2022

If a soap bubble expands, the pressure inside the bubble

A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball $\left(v\right)$ as a function of time $\left(t\right)$ 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 $\rho$, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is $\frac{\rho }{2}$, then the viscous force acting on the ball will be:

A cup of coffee cools from $90°\mathrm{C}$ to $80°\mathrm{C}$ in $t \min$, when the room temperature is $20°\mathrm{C}$. The time taken by a similar cup of coffee to cool from $80°\mathrm{C} \text{to} 60°\mathrm{C}$ at a room temperature same at $20°\mathrm{C}$ is :

Three stars $A, B, C$ have surface temperatures $T_{\mathit{A}},\mathit{ }{T}_{\mathit{B}},T_{\mathit{C}}\mathit{ }$ respectively. Star A appears bluish, star $B$ appears reddish and star $C$ yellowish. Hence,

A liquid does not wet the solid surface if angle of contact is:

A barometer is constructed using a liquid (density $=760 \mathrm{kg} {\mathrm{m}}^{-3}$). What would be the height of the liquid column, when a mercury barometer reads $76 \mathrm{cm}?$

(density of mercury $=13600 \mathrm{kg} {\mathrm{m}}^{-3}$)