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Chemistry QUESTION #4370

Which of the following is a basic buffer?

$NH_4OH/NH_4Cl$✔️
$NaOH/NaCl$
$NaOH/HCl$
$H_2CO_3/NaHCO_3$

Correct Answer Logic:

A basic buffer resists pH changes in the basic range and is made of a weak base and its conjugate acid salt. $NH_4OH$ (weak base) and $NH_4Cl$ (its conjugate acid salt) form a basic buffer with $pH > 7$.

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Math Physics Chemistry Biology QUESTION #11305

Question 2

Which pigment is synthesized by the following: protoporphyrin + Fe++?

Hemoglobin✔️
Chlorophyll
Cytochrome
Myoglobin

Correct Answer Logic:

Protoporphyrin + Fe++ synthesizes hemoglobin.

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Mathematics QUESTION #7476

Question 3

The length of the projection of the line segment joining the points (5, -1, 4) and (4, -1, 3) on the plane $x + y + z = 7$ is:

$\frac{1}{3}$
$\sqrt{\frac{2}{3}}$✔️
$\frac{2}{\sqrt{3}}$
$\frac{2}{3}$

Correct Answer Logic:

The vector joining the points is $\vec{PQ} = (-1, 0, -1)$, with magnitude $\sqrt{1+0+1} = \sqrt{2}$. Normal to plane is $\vec{n} = (1,1,1)$ with magnitude $\sqrt{3}$. The component of $\vec{PQ}$ perpendicular to plane is $\frac{\vec{PQ} \cdot \vec{n}}{|\vec{n}|} = \frac{-1+0-1}{\sqrt{3}} = \frac{-2}{\sqrt{3}}$. Projection length = $\sqrt{|\vec{PQ}|^2 - (\frac{\vec{PQ} \cdot \vec{n}}{|\vec{n}|})^2} = \sqrt{2 - \frac{4}{3}} = \sqrt{\frac{2}{3}}$.

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Math Physics Chemistry Biology QUESTION #4306

Question 4

In a pea plant, seed color is determined by two alleles: Y (Yellow, dominant) and y (green, recessive). Which parental cross would result in a 1:1 ratio of yellow to green seeds?

$Yy \times YY$
$Yy \times yy$✔️
$Yy \times Yy$
$YY \times yy$

Correct Answer Logic:

A test cross $Yy \times yy$ gives 50% $Yy$ (yellow) and 50% $yy$ (green), resulting in a $1:1$ ratio. This is the classic test cross used to determine genotype.

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Accounting & Finance QUESTION #6089

Question 5

Information for a period:

Sales: $1,500,000
Purchases: $1,000,000
Closing Inventory: $50,000

Inventory turnover was 12 times and the gross profit margin was 40%. There were also returns and carriage inwards. Calculate opening inventory.

$100,000✔️
$116,667
$128,572
$200,000

Correct Answer Logic:

1. Gross Profit = $1,500,000 $\times$ 40% = $600,000.
2. Cost of Sales (COS) = $1,500,000 - $600,000 = $900,000.
3. Average Inventory = COS / Turnover = $900,000 / 12 = $75,000.
4. Average Inv = (Opening + Closing) / 2 $\Rightarrow$ $75,000 = (Opening + $50,000) / 2.
5. Opening Inventory = $150,000 - $50,000 = $100,000.

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English QUESTION #7634

Question 6

Running fast they caught the last bus.

Noun phrase
Adjective phrase✔️
Adverb phrase
None of these

Correct Answer Logic:

'Running fast' is an adjective phrase (participial phrase) that modifies 'they', describing the manner in which they caught the bus. It acts as an adjective by providing information about the subject.

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Maths QUESTION #4556

Question 7

What is $15\%$ of $80$?

$12$✔️
$15$
$95$
$1200$

Correct Answer Logic:

$15\%$ of $80 = \frac{15}{100} \times 80 = 0.15 \times 80 = 12$

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Political Science QUESTION #6682

Question 8

In the US, the power of Judicial Review was established in:

Marbury v. Madison✔️
McCulloch v. Maryland
Roe v. Wade
None of these

Correct Answer Logic:

The 1803 Supreme Court case Marbury v. Madison established the principle of judicial review in the United States.

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Psychology QUESTION #9729

Question 9

According to the James-Lange Theory of emotion, which sequence correctly describes how emotions arise?

Stimulus → Emotion → Physiological response
Stimulus → Physiological response → Emotion✔️
Stimulus → Simultaneous emotion and physiological response
Stimulus → Cognitive appraisal → Emotion

Correct Answer Logic:

The James-Lange Theory proposes that emotions are the result of our perception of bodily (physiological) changes, not the cause. The sequence is: stimulus → physiological arousal → conscious emotional experience. For example, we feel afraid because we notice our heart racing, not the other way around. This theory is contrasted with the Cannon-Bard Theory, which argues that emotion and physiological response occur simultaneously.

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FIA Act QUESTION #9988

Question 10

Despite repeal of the 1962 Amalgamation Order, a 'specified person' would continue to be appointed:

In the FIA compulsorily
In or under the Provincial Police post he held before commencement✔️
In the Ministry of Interior
In the Special Police permanently

Correct Answer Logic:

Subject to sub-section (4), such persons continued in their existing Provincial Police posts.

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Planning QUESTION #4992

Question 11

In regression analysis, if $R^2 = 0.64$ for predicting housing prices, what percentage of variance is explained?

36%
64%✔️
80%
100%

Correct Answer Logic:

$R^2$ (coefficient of determination) directly represents the proportion of variance in the dependent variable explained by independent variables. $R^2 = 0.64$ means 64% of housing price variation is explained by the model, leaving 36% unexplained.

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Physics QUESTION #7299

Question 12

Three objects of masses $m_1$, $m_2$, and $m_3$ fall from rest along three different frictionless paths from the same height. Their speeds on reaching the ground will be in the ratio:

$m_1 : m_2 : m_3$
$m_1 : 2m_2 : 3m_3$
$1 : 1 : 1$✔️
$\dfrac{1}{m_1} : \dfrac{1}{m_2} : \dfrac{1}{m_3}$

Correct Answer Logic:

By conservation of energy: $mgh = \dfrac{1}{2}mv^2 \Rightarrow v = \sqrt{2gh}$

The final speed depends only on height $h$ and $g$, not on mass or the shape of the frictionless path. Since all start from the same height, all reach the ground with the same speed.

Ratio $= \mathbf{1:1:1}$

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Physics QUESTION #397

Question 13

100 joules work has been done by an agency in 10 seconds. What is power of agency?

1000 watt
100
10 watt✔️
0.10 watt

Correct Answer Logic:

Power = Work/Time = 100/10 = 10 watts

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Electrical Engineering QUESTION #2149

Question 14

In a DC machine, the purpose of Interpoles is primarily to:

Increase the main field flux
Reduce the speed of the motor
Improve commutation by neutralizing armature reaction✔️
Decrease the starting torque

Correct Answer Logic:

Interpoles are small poles placed to neutralize the cross-magnetizing effect of armature reaction and reduce sparking at the brushes during commutation.

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Statistics QUESTION #1968

Question 15

A survey carried out using a well-defined sampling design and procedure is formally called a:

Sample survey✔️
Population survey
Systematic survey
Census survey

Correct Answer Logic:

A sample survey is conducted using a sampling design, where only a subset (sample) of the population is observed, as opposed to a complete enumeration (census).

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Pakistan Affairs QUESTION #9076

Question 16

The oldest nuclear power plant in Pakistan was established in which city?

Mianwali
Islamabad
Karachi (KANUPP)✔️
Peshawar

Correct Answer Logic:

KANUPP near Karachi was the first.

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MCQs Section QUESTION #4465

Question 17

انسان کہیں ہیرا اور کہیں پتھر ہو جاتا ہے کس کی مثال ہے۔ ('Man becomes a diamond sometimes and a stone others' is an example of?)

تشبیہ ملفوف
تشبیہ جمع
تشبیہ تمثیل✔️
ان میں کوئی نہیں۔

Correct Answer Logic:

This is 'Tashbeeh-e-Tamseel' as it uses a situational analogy to describe human nature.

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English QUESTION #8448

Question 18

It is better for you to comply _______ your parents' wishes.

With✔️
To
By
For

Correct Answer Logic:

'Comply with' means to obey.

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Mathematics QUESTION #6974

Question 19

Find the value of $\displaystyle\int_{-\pi/2}^{\pi/2}\dfrac{\sin^2 x}{1+2^x}\,dx$

$4\pi$
$\dfrac{\pi}{4}$✔️
$\dfrac{\pi}{8}$
$\dfrac{\pi}{2}$

Correct Answer Logic:

Let $I=\displaystyle\int_{-\pi/2}^{\pi/2}\dfrac{\sin^2x}{1+2^x}dx$. Use the property $\int_{-a}^a f(x)dx$: replace $x\to-x$:

$I=\displaystyle\int_{-\pi/2}^{\pi/2}\dfrac{\sin^2x}{1+2^{-x}}dx=\displaystyle\int_{-\pi/2}^{\pi/2}\dfrac{2^x\sin^2x}{1+2^x}dx$

Adding: $2I=\displaystyle\int_{-\pi/2}^{\pi/2}\sin^2x\,dx=\displaystyle\int_{-\pi/2}^{\pi/2}\dfrac{1-\cos2x}{2}dx=\dfrac{\pi}{2}$

$I=\dfrac{\pi}{4}$

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Math Physics Chemistry Biology QUESTION #791

Question 20

Diamond is non-conductor due to:

Free electrons present
Giant structure
Absence of free electrons✔️
None

Correct Answer Logic:

In diamond, each carbon is covalently bonded to four others in a tetrahedral arrangement. There are no free electrons available to conduct electricity.

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