Related Questions

Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?
A Tensile strength
B Elastic limit
C Proportional limit
D Yield strength
A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
A Steel
B Glass
C Rubber
D Brass
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘v’ is made to strike the second ball. Both the balls after impact will move with a velocity
A $${\text{v}}$$
B $$\frac{{\text{v}}}{2}$$
C $$\frac{{\text{v}}}{4}$$
D $$\frac{{\text{v}}}{8}$$
Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?
A E = 2G (1 + v)
B E = G (1 + v)
C $${\text{E}} = \frac{{{\text{G}}\left( {1 + {\text{v}}} \right)}}{2}$$
D E = 2G (1 + 2v)
For perfectly elastic bodies, the value of coefficient of restitution is
A 0
B 0.5
C 1
D 0.25
All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain
A Increases very quickly
B Decreases very quickly
C Increases in proportion to stress
D Decreases in proportion to stress
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
Price-taking firms i.e., firms that operate in a perfectly competitive market, are said to be 'small' relative to the market. Which of the following best describes this smallness?
A The individual firm must have fewer than 10 employees
B The individual firm faces a downward-sloping demand curve
C The individual firm has assets less than Rs. 20 lakhs
D The individual firm is unable to affect market price through its output decisions
Whenever a material is loaded within elastic limit, stress is __________ strain.
A Equal to
B Directly proportional to
C Inversely proportional to
D None of these
The ratio of shear stress and shear strain of an elastic material, is
A Modulus of Rigidity
B Shear Modulus
C Modulus of Elasticity
D Both A and B

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