question_answer1) What is the nature of intermolecular forces?
question_answer2) What is the origin of interatomic force?
question_answer3) What is the origin of intermolecular force?
question_answer5) State the factors due to which three states of matter differ from each other.
question_answer6) What do you mean by long range order in a crystalline structure?
question_answer7) What is the important structural difference between crystalline and glassy solids?
question_answer9) In what respect, the behaviour of glassy solids is similar to that of the liquids?
question_answer10) Why do crystalline solids have well defined geometrical external shapes?
question_answer11) Amorphous solids are not true solids. Why and what are they called then?
question_answer12) Our knowledge about crystalline solids is better than amorphous solids. Why?
question_answer13) Crystalline solids are called true solids. Why?
question_answer14) What is a perfectly elastic body? Give an example.
question_answer15) What is a perfectly plastic body? Give an example.
question_answer16) No material is perfectly elastic. Why?
question_answer17) When does a body acquire a permanent set?
question_answer19) State the two factors on which the modulus of elasticity depends.
question_answer21) Is elastic limit a property of the material of the wire?
question_answer24) Among solids, liquids and gases, which possess the greatest bulk modulus?
question_answer26) What does the slope of stress versus strain graph give?
question_answer27) How does Young's modulus change with the rise of temperature?
question_answer29) Which is more elastic-water or air?
question_answer30) Why are springs made of steel and not of copper?
question_answer31) In stretching a wire, we have to perform work. Why?
question_answer32) What happens to the work done in stretching a wire?
question_answer35) Why does a wire get heated when it is bent back and forth?
question_answer36) A hard wire is broken by bending it repeatedly in alternating directions. Why?
question_answer37) Why is the longer side of cross-section of girder used as depth?
question_answer39) Why are electric poles given hollow structure?
question_answer48) Which is more elastic-rubber or steel? Explain.
question_answer56) What are the factors which affect the elasticity of a material?
question_answer57) Elasticity has a different meaning in physics than that in daily life. Comment.
question_answer59) Why the bridges are declared unsafe after a long use?
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(a) Up to which point on the curve is Hooke's law obeyed? This point is sometimes called "Proportionality limit". (b) Which point on the curve corresponds to elastic limit and yield point of the wire? (c) Indicate the elastic and plastic regions of the stress-strain graph. (d) Describe what happens when the wire is loaded up to a stress corresponding to the point A on the graph, and then unloaded gradually. In particular, explain the dotted curve. (e) What is peculiar about the portion of the stress-strain graph from C to B? Up to what stress can the wire be subjected without causing fracture? 
