All India Mechanical Engineering Group

What is the unit of Young’s modulus in the SI system?
  • a)
    N/m
  • b)
    N/m²
  • c)
    Pa
  • d)
    N
Correct answer is option 'C'. Can you explain this answer?

Naina Das answered  •  2 hours ago
Understanding Young's Modulus
Young's modulus is a fundamental property of materials that measures their stiffness or resistance to deformation when subjected to tensile or compressive stress. It is defined as the ratio of stress (force per unit area) to strain (relative deformation) in the elastic region of a material’s stress-strain curve.
Unit of Young's Modulus
The
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) The stress-strain curve for mild steel is shown in the figure given below. Choose the correct option referring to both figure and table.?

Sanskriti Chakraborty answered  •  2 hours ago
Understanding the Stress-Strain Curve for Mild Steel
The stress-strain curve is a fundamental representation of how materials respond to stress. For mild steel, this curve illustrates various phases of deformation, providing insight into its mechanical properties.
Key Regions of the Stress-Strain Curve
- Elastic Region:
- In this initial region, stress is
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In the space above the mercury column in a barometer tube, the gauge pressure of the vapour is
  • a)
    positive, but more than one atmosphere
  • b)
    negative
  • c)
    zero
  • d)
    positive, but less than one atmosphere
Correct answer is option 'B'. Can you explain this answer?

Pk Academy answered  •  yesterday

In space above mercury column in barometer, ideally perfect vaccum is expected. But due to evaporation of mercury , the pressure in that space is equal to vapour pressure of mercury [nearly 0.2 Pa (abs)] . As absolute pressure in that space is less than atmospheric pressure, gauge pressure is negative.
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