Surface tension of a soap bubble is $$2.0 \times 10^{-2} \mathrm{Nm}^{-1}$$. Work done to increase the radius of soap bubble from $$3.5 \mathrm{~cm}$$ to $$7 \mathrm{~cm}$$ will be:
Take $$\left[\pi=\frac{22}{7}\right]$$
A bicycle tyre is filled with air having pressure of $$270 ~\mathrm{kPa}$$ at $$27^{\circ} \mathrm{C}$$. The approximate pressure of the air in the tyre when the temperature increases to $$36^{\circ} \mathrm{C}$$ is
Match List I with List II
List I | List II | ||
---|---|---|---|
A. | Surface tension | I. | $$\mathrm{kg~m^{-1}~s^{-1}}$$ |
B. | Pressure | II. | $$\mathrm{kg~ms^{-1}}$$ |
C. | Viscosity | III. | $$\mathrm{kg~m^{-1}~s^{-2}}$$ |
D. | Impulse | IV. | $$\mathrm{kg~s^{-2}}$$ |
Choose the correct answer from the options given below :
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Steel is used in the construction of buildings and bridges.
Reason R : Steel is more elastic and its elastic limit is high.
In the light of above statements, choose the most appropriate answer from the options given below