ANS:A - knowledge

No answer description is available. 

ANS:A - 1

Since C is a compiler dependent language, in Turbo C (DOS) the output will be 2, but in GCC (Linux) the output will be 4.

ANS:D - 100 cm

Chromatic Aberration ? :

->For Single Lenses the focal length of blue light will be slightly shorter than that for red light is know as Chromatic aberration,

Spherical Aberration:

->In Real Spherical lenses these outer rays do not focus at exactly the same point because of spherical aberration,

F = Focal Length ,
P = 1/F power lenses.
1 diopter equal 100 c.m./1 m. What is Means Diopter:-

-> A dioptre (uk), or diopter (us), is a unit of measurement of the optical power of a lens or curved mirror,
-> which is equal to the reciprocal of the focal length measured in metres.

Slove:-
1/metres For example, a 3-dioptre lens brings parallel rays of light to focus at 1/3 metre.

(Right Answer- 1 Diopter egual 100 cm or 1 m.)

ANS:C - 22.3 Ω

Since second and third decimal places of R₁ are not known, we can take only first decimal place of R₂.

ANS:C - Garnet

No answer description is available.

ANS:B - inertial forces to viscous forces.

Reynolds number (Re) is the ratio of inertial forces to viscous forces.

Explanation:

1. Definition of Reynolds Number:
   • Reynolds number (Re) is a dimensionless quantity used to predict flow patterns in different fluid flow situations. It is defined as: Re=ρ⋅V⋅Lμ\text{Re} = \frac{\rho \cdot V \cdot L}{\mu}Re=μρ⋅V⋅L​ where:
     • ρ\rhoρ is the density of the fluid,
     • VVV is the velocity of the fluid relative to the object,
     • LLL is a characteristic length (such as diameter of a pipe),
     • μ\muμ is the dynamic viscosity of the fluid.
2. Significance of Reynolds Number:
   • Reynolds number helps in determining the type of flow (laminar or turbulent) around an object or through a pipe. It indicates the relative importance of inertial forces (which tend to cause the fluid to accelerate and change direction) compared to viscous forces (which resist the flow and dissipate energy as heat).
3. Interpretation:
   • Reynolds number is dimensionless and is used to classify fluid flow:
     • Laminar flow occurs at low Reynolds numbers (Re < 2000 approximately), where viscous forces dominate and the flow is smooth and orderly.
     • Turbulent flow occurs at high Reynolds numbers (Re > 4000 approximately), where inertial forces dominate, and the flow is chaotic and irregular.
     • Transitional flow occurs in the range between laminar and turbulent regimes.
4. Conclusion:
   • Therefore, Reynolds number (Re) is specifically defined as the ratio of inertial forces to viscous forces within a flowing fluid, providing critical information about the flow regime and behavior.

ANS:C - September 18

International Equal Pay Day, celebrated on 18 September, represents the longstanding efforts towards the achievement of equal pay for work of equal value.

ANS:A - September 18

World Bamboo Day is observed on September 18 to raise awareness about the conservation of this extremely useful plant.

ANS:B - September 17

World Patient Safety Day is celebrated on September 17.

ANS:C - September 16

World Ozone Day is celebrated every year on September 16.