UAF ENTRY TEST PAST PAPER 08-08-2016
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
In
After
To
With
اس سوال کو وضاحت کے ساتھ پڑھیں
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.
Ag₂O
NiO₂
Cd
Zn
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Explanation
A NiCad (Nickel-Cadmium) battery has a nickel oxide hydroxide ( NiO2 ) cathode and a cadmium anode.
