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DEPARTMENT OF APPLIED PHYSICS
Question Bank-I semester
PH6151- Engineering Physics -I
UNIT -II – Properties of matter and Thermal Physics
1. What is elasticity?
A property of a body to regain its original state/condition on removal of the applied force is called elasticity. Elasticity of a substance is due to intermolecular forces.
2. What is bending moment?
The moment of the couple due to the internal restoring couple which balances the external couple due to the applied load is called bending moment.
3. Define neutral axis.
The line along which the neutral surface intersects the plane of bending is called the neutral axis.
4. Define stress and strain and write down their units.
Stress is defined as the restoring force per unit area which brings back the body to its original state from the deformed state. Unit for stress N/m2.
Strain is defined as the change in dimension to the original dimension.
Strain = Change in dimension /original dimension.
5. What do you infer from stress-strain diagram?
From the Stress-Strain diagram, we can infer the following points,
(i) The Stress is directly proportional to the strain, within the elastic limit.
(ii) It distinguishes the elastic and plastic limit of a material.
(iii) It determines the ultimate strength of the material.
(iv) The stress-strain diagram also helps us to distinguish the material based on the properties such as ductility and brittleness.
6. State Hooke’s law.
According to Hook, stress is directly proportional to strain within the elastic limit.
Stress ∝ Strain
Stress/Strain = E (Modulus of elasticity) N/m2
7. Explain Poisson’s Ratio.
The ratio of the lateral strain to the longitudinal strain within the elastic limit is called as poisson’s ratio (σ) Poisson’s ratio = Lateral Strain/Longitudinal Strain= a constant
8. Give the relation between the three modulii of elasticity.
Y= 9Kn/3K+n where,
n- Rigidity modulus
9. How do temperature and impurity in a material affect the elasticity of the materials?
The rise in temperature decreases elasticity and vice versa.
Example : The carbon filament becomes plastic at higher temperatures.
The addition of impurities produces variation in the elastic property of the materials. The decrease and increase in elasticity depends on the type of impurity added to it.
Example : When potassium is added to gold, the elastic property of gold increases.
10.Calculate the Young’s Modulus in the cantilever depression method used. The length of cantilever beam is 1 m which is suspended with a load of 150 gm. The depression is found to be 4 cm. The thickness of the beam is 5 mm and breadth of the beam is 3 cm.
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Anna University 1st SEM IT PHY1 2marks 16 marks
PH6151 Engineering Physics 1 question bank free download
Anna University IT PHY1 short answers Regulation 2013
PH6151 2marks, PHY1 Unit wise short answers – IT 1st Semester