KMU CAT PAST PAPER 07-09-2025
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
انسولین جسم کے کس عضو سے تیار ہوتی ہے؟
Liver
Pancreas
Kidney
Brain
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Explanation
Insulin is produced by the pancreas , which is an organ located behind the stomach.
The pancreas contains clusters of cells called the Islets of Langerhans, specifically the beta cells within these islets , which are responsible for producing insulin.
Insulin plays a crucial role in regulating blood sugar levels by facilitating the uptake of glucose into cells for energy production or storage.
When blood sugar levels rise after a meal, the pancreas releases insulin to help lower blood sugar levels by promoting the uptake of glucose into cells.
Celsius scale
Fahrenheit scale
Centigrade scale
Thermodynamic scale
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Explanation
The thermodynamic (Kelvin) scale is based on absolute zero and does not depend on the substance used. Other scales like Celsius or Fahrenheit vary with the physical properties of specific substances.
[He] 4s¹
[Ar] 4s¹
[Ar] 4s²
None of these
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Explanation
Potassium (K, atomic number 19 ) has 19 electrons.
Its configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ , which is [Ar] 4s¹ in shorthand.
–1.6 × 10⁻¹⁹ C
–1.6 × 10⁻¹⁸ C
–1.6 × 10⁻²⁰ C
–3.2 × 10⁻¹⁹ C
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Explanation
- The elementary charge on a single electron is -1.6 × 10⁻¹⁹ coulombs.
- It’s a fundamental physical constant.
The charges of Proton, Electron, Neutron respectively are:
Proton: Positive charge (+1) Electron: Negative charge (-1) Neutron: Neutral charge (0)
f
s
p
None of these
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Explanation
p-orbitals have a dumbbell shape with two lobes on opposite sides of the nucleus.
s -orbitals are spherical.
d -orbitals are clover-shaped.
f -orbitals are more complex.
C₃H₆O₂
C₂H₄O₂
C₂H₆O₂
None of these
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Explanation
Empirical formula calculation :
C: 40 ÷ 12 ≈ 3.33 → 2 (adjusted for simplest whole numbers)
H: 6.7 ÷ 1 ≈ 6.7 → 4
O: 53.3 ÷ 16 ≈ 3.33 → 2
→ Empirical formula ≈ C₂H₄O₂
Relative molecular mass check:
C₂H₄O₂ = 2×12 + 4×1 + 2×16 = 60 → fits the given range 55–65 .
2.0 moles of hydrogen chloride
0.5 moles of water
1.0 moles of carbon dioxide 1.0 moles of methane
None of these
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Explanation
Number of atoms = moles × Avogadro’s number × atoms per molecule.
HCl: 2.0 moles × 2 atoms = 4.0 moles of atoms H₂O: 0.5 moles × 3 atoms = 1.5 moles of atoms CO₂: 1.0 mole × 3 atoms = 3.0 moles of atoms CH₄: 1.0 mole × 5 atoms = 4.0 moles of atoms HCl and CH₄ both have 4 moles of atoms, but the given answer refers to HCl .
40%
80%
30%
None of these
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Explanation
Calcium carbonate (CaCO₃) has molar mass 100 g/mol (Ca = 40, C = 12, O₃ = 48).
%Ca = (40/100) × 100 = 40%.
Second order reaction
Not possible
Zero order reaction
None of these
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Explanation
In a zero-order reaction , the rate is independent of the concentration of reactants.
The rate depends only on the rate constant, i.e., Rate = k .
First step
Fastest step
Slowest step
None of these
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Explanation
The slowest elementary step in a reaction mechanism is called the rate-determining step.
It controls the overall reaction rate , as faster steps cannot proceed faster than this limiting step.
