MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: B. 1.0 J/g·°C
Explanation:
Use c=q/(mΔT).
C=1000/(50×20)=1.0 J/g·°C.
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Correct Answer: C. 300 N
Explanation:
Buoyant force equals ρVg.
F=1000×0.03×10 = 300 N.
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Correct Answer: D. 0.75
Explanation:
For floating equilibrium, submerged fraction equals object density divided by fluid density.
750/1000 = 0.75.
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Correct Answer: A. 0.12 m³/s
Explanation:
Volume flow rate is Q=Av.
Q=0.04×3 = 0.12 m³/s.
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Correct Answer: B. Reactants are strongly favored at equilibrium
Explanation:
A small K means little product is present at equilibrium.
The forward reaction may still occur.
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Correct Answer: C. A ratio with the equilibrium-expression form using current concentrations or pressures
Explanation:
Q can be calculated at any stage.
Comparing Q with K predicts the direction of net change.
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Correct Answer: D. Toward products
Explanation:
The mixture contains too little product relative to equilibrium.
Net forward reaction increases Q toward K.
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Correct Answer: A. Heat required to raise an object's temperature by one degree
Explanation:
Heat capacity depends on the amount and identity of matter.
Specific heat capacity is heat capacity per unit mass.
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Correct Answer: A. Toward reactants
Explanation:
The mixture contains too much product relative to equilibrium.
Net reverse reaction lowers Q toward K.
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Correct Answer: B. Measurement of heat changes
Explanation:
Calorimeters track temperature changes in known heat capacities.
They help determine reaction or phase-change energy.
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Correct Answer: B. How an equilibrium system responds to a disturbance
Explanation:
An equilibrium shifts to oppose an imposed change.
Changes in concentration, pressure, or temperature may shift position.
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Correct Answer: C. Overall enthalpy change is the sum of enthalpy changes for any reaction pathway
Explanation:
Enthalpy is a state function.
Therefore the path between initial and final states does not affect ΔH.
