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General Knowledge QUESTION #11530

Software applications designed to detect system errors and diagnose technical failures are called:

Operating system extensions
Cookies
Diagnostic software✔️
Boot diskettes

Correct Answer Logic:

Diagnostic software identifies, analyses, and reports on hardware and software faults. Examples include Windows Diagnostics, MemTest86 (memory testing), CrystalDiskInfo (drive health), and CPU-Z. They help technicians pinpoint problems without manual disassembly.

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General Knowledge QUESTION #11514

Question 2

Which internal CPU register keeps track of the memory address for the next instruction to execute?

Program Counter (PC)✔️
Memory Data Register (MDR)
Instruction Register (IR)
Memory Address Register (MAR)

Correct Answer Logic:

The Program Counter (PC), also called the Instruction Pointer, holds the memory address of the next instruction to be fetched and executed. After each instruction fetch, the PC is automatically incremented. It is a critical component of the fetch-decode-execute cycle.

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Mathematics QUESTION #6021

Question 3

The system $x+ky+3z=0$, $3x+ky-2z=0$, $2x+4y-3z=0$ has a non-zero solution $(x,y,z)$. Find the value of $\dfrac{xz}{y^2}$.

-30
30
-10
10✔️

Correct Answer Logic:

For non-zero solution, $\Delta=0$:

$\begin{vmatrix}1&k&3\\3&k&-2\\2&4&-3\end{vmatrix}=1(−3k+8)−k(−9+4)+3(12−2k)=−3k+8+5k+36−6k=44−4k=0$

So $k=11$.

With $k=11$: from equations 1 and 2: $x+11y+3z=0$ and $3x+11y-2z=0$. Subtracting: $2x-5z=0\Rightarrow x=\frac{5z}{2}$.

Substituting back: $\frac{5z}{2}+11y+3z=0\Rightarrow 11y=-\frac{11z}{2}\Rightarrow y=-\frac{z}{2}$.

$\frac{xz}{y^2}=\frac{\frac{5z}{2}\cdot z}{\frac{z^2}{4}}=\frac{\frac{5z^2}{2}}{\frac{z^2}{4}}=\frac{5}{2}\times4=\mathbf{10}$

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English QUESTION #8314

Question 4

Every student is familiar _______ the name of Mohammad Ali Jinnah.

To
With✔️
By
In

Correct Answer Logic:

'Familiar with' is the correct preposition.

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Ability / HR / Governance / Special Education QUESTION #1885

Question 5

Under Rule 6(2) what is the minimum and maximum time given to an accused to submit a written defence after the charge is communicated?

Minimum 3 days maximum 7 days
Minimum 7 days maximum 14 days✔️
Minimum 14 days maximum 21 days
Minimum 10 days maximum 20 days

Correct Answer Logic:

Rule 6(2) specifically prescribes not less than seven days and not more than fourteen days for submitting a written defence.

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CISA QUESTION #6843

Question 6

An organization implements multi-factor authentication but configures it to require only username/password during business hours, with the second factor required only for after-hours access. What is the PRIMARY security weakness?

Inconsistent user experience
Reduced security protection during the highest-risk period when most users are active✔️
Complicated configuration
Increased support costs

Correct Answer Logic:

Most attacks occur during business hours when users are active and system activity can blend with normal operations. Requiring MFA only after-hours protects the lower-risk period while leaving the higher-risk business hours protected by only single-factor authentication. The security is inverted from risk-based design.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #2962

Question 7

A 'Linctus' is primarily intended for which clinical use?

Treatment of skin infections
Relief of cough✔️
Cleansing of the ear canal
Lubrication of the eye

Correct Answer Logic:

Linctuses are viscous oral liquids, usually containing syrup, used for the relief of cough.

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Maths QUESTION #2908

Question 8

Find the area of a square whose perimeter is $24$ cm.

$36\text{ cm}^2$✔️
$16\text{ cm}^2$
$48\text{ cm}^2$
$24\text{ cm}^2$

Correct Answer Logic:

Side $= 24/4 = 6$. Area $= 6^2 = 36$.

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Molecular Biology / Bioinformatics / Biochemistry QUESTION #11095

Question 9

Human immunodeficiency virus (HIV) primarily targets and infects:

Red blood cells
Fibroblasts
Helper T lymphocytes (CD4+ cells)✔️
Mast cells

Correct Answer Logic:

HIV specifically infects cells expressing the CD4 surface glycoprotein, primarily CD4⁺ Helper T lymphocytes (T helper cells), along with macrophages and dendritic cells. The HIV envelope protein gp120 binds CD4 along with a co-receptor (CCR5 or CXCR4). Progressive depletion of CD4⁺ T cells (from ~1,000 cells/μL to <200 cells/μL) cripples cell-mediated immunity, leading to AIDS and susceptibility to opportunistic infections.

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Mathematics QUESTION #11158

Question 10

$\displaystyle\int_0^\pi \csc^2 x\,dx =$

$0$
$1$
$-1$
$\infty$✔️

Correct Answer Logic:

$\int_0^\pi \csc^2 x\,dx = [-\cot x]_0^\pi$. At both $x=0^+$ and $x=\pi^-$, $\cot x\to \infty$ (changes sign). The integrand has a non-integrable singularity at both endpoints, so the integral diverges ($\infty$).

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Maths QUESTION #4524

Question 11

If $a < b$ and $c < 0$, then $ac$:

$< bc$
> bc✔️
$= bc$
Cannot determine

Correct Answer Logic:

Multiplying both sides by negative reverses inequality. Since $c < 0$: $a < b \Rightarrow ac > bc$

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Reading and Writing (Module-1) QUESTION #10487

Question 12

The senator's ------- stance on trade policy ------- depending on which regional audience she was addressing that week.

consistent . . remained
vacillating . . shifted✔️
firm . . stayed
unwavering . . held

Correct Answer Logic:

A stance that changes with the audience is 'vacillating,' and it 'shifted' accordingly.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3222

Question 13

The 'Organ of Corti' is the actual organ of hearing located inside the:

Semicircular canals
Utricle
Cochlea✔️
Middle ear

Correct Answer Logic:

Hair cells in the cochlea convert mechanical sound waves into electrical impulses.

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Physics QUESTION #7087

Question 14

A material has density $\rho$ and bulk modulus $K$. What is the increase in density when a uniform pressure $P$ is applied?

$\frac{\rho P}{K}$✔️
$\frac{\rho K}{P}$
$\frac{K}{\rho P}$
$\frac{PK}{\rho}$

Correct Answer Logic:

Bulk modulus $K = \rho \frac{dP}{d\rho}$.

Rearranging for change in density $d\rho$: $d\rho = \frac{\rho dP}{K}$
Given $dP = P$, the increase is $\frac{\rho P}{K}$.

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Chemistry QUESTION #7110

Question 15

Given the half-cell reactions:
1. $Mn^{2+} + 2e^{-} \rightarrow Mn$; $E^{0} = -1.18\text{ V}$
2. $Mn^{3+} + e^{-} \rightarrow Mn^{2+}$; $E^{0} = +1.51\text{ V}$
Determine the $E^{0}$ for the disproportionation reaction $3Mn^{2+} \rightarrow Mn + 2Mn^{3+}$ and its feasibility.

-0.33 V; non-spontaneous
-0.33 V; spontaneous
-2.69 V; non-spontaneous✔️
-2.69 V; spontaneous

Correct Answer Logic:

The target reaction is $3Mn^{2+} \rightarrow Mn + 2Mn^{3+}$. This is the sum of:
Reduction: $Mn^{2+} + 2e^{-} \rightarrow Mn$ ($E^{0}_{red} = -1.18\text{ V}$)
Oxidation: $2Mn^{2+} \rightarrow 2Mn^{3+} + 2e^{-}$ ($E^{0}_{ox} = -1.51\text{ V}$)
$E^{0}_{cell} = E^{0}_{cathode} - E^{0}_{anode} = -1.18 - 1.51 = -2.69\text{ V}$. Since $E^{0}_{cell}$ is negative, the reaction is non-spontaneous.

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Boilers Mechanical Engineering QUESTION #3988

Question 16

'Scaling' on the internal surfaces of a boiler tube is dangerous because it:

Makes the boiler look old
Acts as an insulator, causing the metal to overheat and fail✔️
Increases the weight of the boiler
Makes the water taste bad

Correct Answer Logic:

Scale has low thermal conductivity; heat cannot transfer to water, causing the tube metal to reach melting/weakening points.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3658

Question 17

'Chalk' is an example of a crude drug from the:

Plant kingdom
Animal kingdom
Mineral kingdom✔️
Synthetic origin

Correct Answer Logic:

Mineral drugs include chalk, kaolin, and bentonite.

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FIA Act QUESTION #9985

Question 18

The FIA Act, 1974 repealed which two prior instruments?

Police Act 1861 and CrPC 1898
Pakistan Special Police Establishment Ordinance 1948 and the 1962 Amalgamation Order✔️
Elections Act 2017 and CCP 1908
PPC 1860 and Police Order 2002

Correct Answer Logic:

Section 9 repeals the 1948 Ordinance and the 1962 Special Police and Provincial Police (Amalgamation) Order.

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Education QUESTION #1482

Question 19

Which educational philosophy emphasizes teaching ideas that are everlasting and seeks enduring realities through great literature, art, philosophy, and religion?

Pragmatism
Perennialism✔️
Realism
Existentialism

Correct Answer Logic:

Perennialism focuses on teaching ideas that are everlasting and seeks enduring realities which are constant, found through great literature, art, philosophy, and religion. Key proponents include Robert Hutchins and Mortimer Adler.

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Psychology QUESTION #1473

Question 20

Which of the following factors is most likely to influence the accuracy of eyewitness testimony?

The eyewitness's level of education
The eyewitness's emotional state during the event✔️
The time of day the event occurs
The presence of the police during the event

Correct Answer Logic:

Research by Elizabeth Loftus and others has shown that the eyewitness's emotional state during the event is a major factor affecting memory accuracy. High emotional arousal (especially fear or stress) can impair accurate encoding and recall — the 'weapon focus effect' is one example. Post-event misinformation, leading questions, and stress also distort memories. Education level and time of day have relatively little direct effect on accuracy.

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