UNIVERSITY OF AGRICULTURE UAF PAST PAPERS AND SYLLABUS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
About
After
In
Off
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Explanation
The verb "brag" is commonly followed by the preposition " about " when referring to what someone is boasting of.
We should not brag about our deeds.
ہمیں اپنے اعمال پر فخر نہیں کرنا چاہیے۔
In
After
To
With
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Explanation
The correct preposition after "justified" when followed by a gerund (verb+ing) is "in."
You are justified in claiming for your rights.
آپ اپنے حقوق کا دعویٰ کرنے کے لیے جائز ہیں۔
Least count of the instrument
Fractional uncertainty
Accuracy
Percentage uncertainty
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Explanation
The absolute uncertainty in a measuring instrument is half of the smallest division (or the least count) of the instrument.
This value represents the potential error in a measurement due to the instrument's limitations.
∑ τ = 0
∑ F=0
∑ β = 0
∑ Fx = 0
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Explanation
A body is in translational equilibrium when the vector sum of all forces acting on it is zero, meaning ∑F = 0.
This implies the sum of forces in both the x and y directions are also zero, i.e., ∑Fx = 0 and ∑Fy = 0.
The statement ∑τ = 0 is related to rotational equilibrium , not translational equilibrium.
The condition ∑β = 0 is not standard terminology in physics.
Nm
Ns
J
N
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Explanation
An alternative unit to kg ms⁻¹ is Ns (Newton-second).
This is because 1 N = 1 kg⋅m⋅s⁻², and multiplying by seconds gives Ns = kg⋅m⋅s⁻¹.
Quantitative analysis
Qualitative analysis
Gravimetric analysis
None of these
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Explanation
The chemical analysis in which all the elements present in a compound are identified is called qualitative chemical analysis.
This type of analysis focuses on determining the presence or absence of specific elements or compounds within a sample, rather than quantifying their amounts.
NF₃
CF₄
PCl₃
CCl₄
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Explanation
The compound that does not obey the octet rule is NF₃.
In NF₃, nitrogen has only 7 valence electrons and forms three single bonds with fluorine atoms, giving it a total of 6 electrons in its outermost shell, which violates the octet rule.
Chlorination of KMnO₄
Neutralization reaction
Oxidation reduction reaction
Neither oxidation nor reduction
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Explanation
The reaction 2KMnO₄ + Cl₂ → 2KMnO₄ + 2KCl is Oxidation reduction reaction.
In this reaction, the oxidation number of chlorine changes from 0 in Cl₂ to -1 in KCl, which is considered reduction.
While the oxidation state of manganese and potassium remains the same in KMnO₄,
The overall reaction involves a transfer of electrons between chlorine and potassium, making it a redox reaction.
14/17×100
14/34×100
3/17×100
3/34×100
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Explanation
Molar mass of nitrogen (N): 14.01 g/mol
Molar mass of hydrogen (H): 1.01 g/mol (3 H atoms in NH3)
Molar mass of ammonia (NH3): 14.01 + (3 * 1.01) = 17.04 g/mol
Percentage of nitrogen in NH3 = (14.01 / 17.04) * 100 = 82.23%
This is very close to the provided option of 82.35%, which can be expressed as 14/17 * 100.
Δx · Δp ≥ ħ / 2
ΔE · Δt = 0
F = ma
E = mc²
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Explanation
The correct equation representing Heisenberg's uncertainty principle is A) Δx. Δp ≥ ħ/2.
This equation relates the uncertainty in position (Δx) to the uncertainty in momentum (Δp),
Where "ħ" is the reduced Planck constant.
