Related InterviewSolutions

• A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly(a) a straight line (b) a circular arc(c) a parabola (d) an ellipse.
• A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may represent the plot ?
• A heated body emits radiation which has maximum intensity near the frequency v0. The emissivity of the material is 0.5. If the absolute temperature of the body is doubled, (a) the maximum intensity of radiation will be near the frequency 2v0 (b) the maximum intensity of radiation will be near the frequency v0/2 (c) the total energy emitted will increase by a factor of 16.(d) the total energy emitted will increase by a factor of 8.
• An iron washer is heated. State the effect on its (i) mass, (ii) internal diameter, (iii) external diameter, and (iv) density.
• An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. Explain the reason.
• A solid at temperature T1 is kept in an evacuated chamber at temperature T2> T1. The rate of increase of temperature of the body is proportional to (a) T2 - T1(b) T22 - T21(c) T32 - T31(d) T42 - T41
• Write true or false for the statementTemperature of a liquid rises during boiling or vaporization.
• Write true or false for the statementBoiling is a rapid phenomenon.
• Write true or false for the statementAll molecules of a liquid take part in boiling.
• During boiling or vaporization 1. all molecules take part 2. temperature rises 3. no heat is absorbed 4. the average kinetic energy of molecules increases.