FFC APPRENTICESHIP CHEMICAL PAST PAPER 2023
FFC 5 years
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
Steady flow
Incompressible fluid
No external forces acting on the fluid
Negligible viscosity
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Explanation
Bernoulli's equation is derived under the following assumptions:
- A) Steady flow ( Flow parameters do not change with time )
- B) Incompressible fluid ( Density remains constant )
- C) No external forces acting on the fluid. Incorrect assumption
→ Bernoulli’s equation does consider external forces like gravity (included as potential energy).
- D) Negligible viscosity (No energy loss due to internal friction)
Thus, optio n C is not assumed and is the correct answer.
Temperature
Volume
Enthalpy
Entropy
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Explanation
The Clausius-Clapeyron equation relates the vapor pressure of a substance to its temperature and,
More specifically, the enthalpy of vaporization of the substance.
It describes how vapor pressure changes with temperature,
Allowing one to calculate the vapor pressure at a different temperature if the enthalpy of vaporization and the vapor pressure at a known temperature are known.
Water treatment
Water disinfection
Water filtration
Water remediation
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Explanation
The process of reducing the concentration of pollutants in water to safe levels is generally called water purification or wastewater treatment.
Specific methods used for this purpose include physical processes
Like sedimentation and filtration, chemical processes such as oxidation and disinfection,
And biological methods using microorganisms and plants.
Water
Air
Honey
Ethanol
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Explanation
- Non-Newtonian fluids have variable viscosity depending on applied force.
- Honey thickens or thins under different shear rates, so it's non-Newtonian.
N = kA(Ca - Cb)
N = kA(Cb - Ca)
N = kA(Ca + Cb)
N = kA(Ca * Cb)
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Explanation
- N = mass transfer rate
- k = mass transfer coefficient
- A = area
- Ca and Cb = concentrations at two phases
→ This equation follows Fick's law of diffusion.
Lies below the equilibrium line
Lies above the equilibrium line
And equilibrium lines are parallel
Is far from the equilibrium line
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Explanation
- HETP (Height Equivalent to a Theoretical Plate) and HTU (Height of a Transfer Unit) relate to separation efficiency.
- They are numerically equal when the operating and equilibrium lines are parallel,
- Meaning the driving force for mass transfer is constant.
Cement
Ammonia
Ion exchange resins
Petrochemicals
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Explanation
The Haber-Bosch process combines nitrogen (N₂) and hydrogen (H₂) under high temperatures and pressures in the presence of a catalyst to produce ammonia (NH₃).
- It's crucial for fertilizer production.
الیکٹران کے بہاؤ کو روکنے والے مواد کو کیا کہا جاتا ہے؟
Insulators
Super conductors
Conductors
Semi conductors
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Explanation
Materials that block the flow of electrons are called insulators .
They have high resistance and prevent electrical current from flowing through them.
Such as rubber or glass.