19 solutions available
Question 3Fill in the blanks:(a) Boiling occurs at ............... .(b) Evaporation takes place at ............... .(c) The molecules of liquid...
Question 2Distinguish between liquid and vapour (or gas) states of matter on the basis of the following factors:(a) Arrangement of molecules(b)...
Question 3What is evaporation? Explain it on the basis of molecular motion.
Question 5Describe an experiment to demonstrate the thermal expansion in solids.
Question 6Describe an experiment to show that liquids expand on heating.
Question 7Describe an experiment to show that air expands on heating.
Question 8Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.
Question 1(i)The correct statement is:Iron rims are cooled before they are placed on the cart wheels.A glass stopper gets tightened on warming the...
Question 4Comment on the statement 'Evaporation is a surface phenomenon'.
Question 11State three factors on which depend the linear expansion of a metal rod on heating.
Question 12A metal plate is heated. State three factors on which the increase in its area will depend.
Question 16100 ml of each of the following liquids is heated from 10°C to 50°C. Which will expand more:(a) water(b) benzene(c) alcohol?
Question 17Water is heated from 0°C to 4°C. Will it expand?
Question 18What do you mean by anomalous behavior of water?
Question 19How does the density of a substance (solid, liquid and gas) change on heating?
Question 8(c)Explain the following:Gaps are left between the successive rails on a railway track.
Question 9Why is one end of a steel girder in a bridge kept on rollers instead of fixing it in a pillar?
Question 10An 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...
Question 11An iron washer is heated. State the effect on its:(a) mass(b) internal diameter(c) external diameter and(d) density.