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Stimulants (caffeine, amphetamines, cocaine) increase CNS activity, producing heightened energy, alertness, and wakefulness. They increase dopamine and norepinephrine activity. They do not alleviate tension or treat insomnia.

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Physics QUESTION #4389

Question 3025

If the distance between two charges is halved and the magnitude of charges are also doubled, then the force between these charges becomes:

Two times
Four times
Eight times
Sixteen times✔️

Correct Answer Logic:

By Coulomb's law: $F = k\dfrac{q_1 q_2}{r^2}$. New force: $F' = k\dfrac{(2q_1)(2q_2)}{(r/2)^2} = k\dfrac{4q_1q_2}{r^2/4} = \dfrac{16kq_1q_2}{r^2} = 16F$. The force becomes $\mathbf{16}$ times.

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Physics QUESTION #7043

Question 3026

Unpolarised light with intensity $I_0$ passes through polaroid A, then through polaroid B. If the transmission axis of B is at $45^\circ$ to A, find the final intensity.

$I_0$
$\frac{I_0}{2}$
$\frac{I_0}{4}$✔️
$\frac{I_0}{8}$

Correct Answer Logic:

After passing through polaroid A, the intensity becomes $I_1 = \frac{I_0}{2}$.

According to Malus's Law, after passing through polaroid B:

$I_2 = I_1 \cos^2 \theta = \frac{I_0}{2} \cos^2(45^\circ) = \frac{I_0}{2} \times \left( \frac{1}{\sqrt{2}} \right)^2 = \frac{I_0}{4}$.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3461

Question 3027

'Collagen' is the most abundant protein in the human body and is a:

Globular protein
Fibrous protein✔️
Enzyme
Hormone

Correct Answer Logic:

It provides structural support to skin, bones, and tendons.

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Chemistry QUESTION #448

Question 3028

Ten moles of hydrogen are allowed to react with 6 moles of oxygen. How much water will be obtained from reaction on complete consumption of one gas?

10 moles✔️
8 moles
6 moles
4 moles

Correct Answer Logic:

2H? + O? ? 2H?O; H? is limiting, produces 10 moles H?O

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Boilers Mechanical Engineering QUESTION #2511

Question 3029

According to the Gerber (parabolic) fatigue criterion, the equation relating $\sigma_a$, $\sigma_m$, $S_e$, and $S_{ut}$ is:

$\frac{\sigma_a}{S_e} + \frac{\sigma_m}{S_{ut}} = 1$
$\left(\frac{n\sigma_a}{S_e}\right) + \left(\frac{n\sigma_m}{S_{ut}}\right)^2 = 1$
$\frac{\sigma_a}{S_e} + \left(\frac{\sigma_m}{S_{ut}}\right)^2 = 1$✔️
$\frac{\sigma_a}{S_e} \cdot \frac{\sigma_m}{S_{ut}} = 1$

Correct Answer Logic:

The Gerber parabolic criterion: $\frac{\sigma_a}{S_e}+\left(\frac{\sigma_m}{S_{ut}}\right)^2=1$. Gerber's curve passes through the central region of fatigue failure data.

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Chemistry QUESTION #7149

Question 3030

Which of the following alkaline earth metal nitrates does not contain water of crystallization in its solid form?

$Mg(NO_{3})_{2}$
$Sr(NO_{3})_{2}$
$Ca(NO_{3})_{2}$
$Ba(NO_{3})_{2}$✔️

Correct Answer Logic:

The ability of alkaline earth metal ions to hydrate decreases as the size of the cation increases. Barium ($Ba^{2+}$) has the largest size and lowest charge density among the options provided, meaning it does not have enough polarizing power to hold water molecules. Consequently, $Ba(NO_{3})_{2}$ crystallizes as an anhydrous salt.

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Physics QUESTION #7088

Question 3031

A wire has length $l_1$ at tension $T_1$ and $l_2$ at tension $T_2$. Find its original length.

$\frac{T_1 l_1 - T_2 l_2}{T_2 - T_1}$
$\frac{l_1 + l_2}{2}$
$\frac{T_2 l_1 + T_1 l_2}{T_2 + T_1}$
$\frac{T_2 l_1 - T_1 l_2}{T_2 - T_1}$✔️

Correct Answer Logic:

Using Hooke's Law: $l = L + \frac{TL}{AY} \implies l = L + kT$ where $k = \frac{L}{AY}$.

$l_1 = L + kT_1$ and $l_2 = L + kT_2$
Subtracting: $l_2 - l_1 = k(T_2 - T_1) \implies k = \frac{l_2 - l_1}{T_2 - T_1}$
Substitute $k$ back: $L = l_1 - T_1(\frac{l_2 - l_1}{T_2 - T_1}) = \frac{T_2 l_1 - T_1 l_2}{T_2 - T_1}$.

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Accounting & Finance QUESTION #6095

Question 3032

Under what condition would factory overheads be considered 'over absorbed'?

The amount absorbed is less than the budgeted overheads.
The amount absorbed is greater than the budgeted overheads.
The actual overheads incurred are less than the amount absorbed.✔️
The actual overheads incurred are greater than the amount absorbed.

Correct Answer Logic:

Over absorption occurs when the overhead absorbed (Rate $\times$ Actual Activity) is higher than the actual overheads incurred.

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Boilers Mechanical Engineering QUESTION #4011

Question 3033

'Steam Quality' (Dryness Fraction) of $0.9$ means:

The steam is $100\%$ water
The steam contains $90\%$ dry steam and $10\%$ water droplets✔️
The steam is $90\%$ water
The steam is at $90~psi$

Correct Answer Logic:

Ideally, steam for turbines should be as dry as possible ($x \approx 1.0$).

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General Knowledge QUESTION #2594

Question 3034

A group of 8 bits is known as:

A Kilobyte
A Nibble
A Byte✔️
A Megabit

Correct Answer Logic:

A byte is a group of 8 bits. It is the fundamental unit of digital data storage. All larger units — kilobytes, megabytes, gigabytes — are multiples of bytes. A single character like the letter 'A' typically requires 1 byte to store.

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CISA QUESTION #6819

Question 3035

In evaluating separation of duties within an IT department, an auditor finds that the database administrator has both production library access and the authority to approve changes. What is the PRIMARY risk?

Inefficient change management
Unauthorized changes could be implemented without detection✔️
Delayed system updates
Increased operational costs

Correct Answer Logic:

Separation of duties requires that authorization be separated from execution. When the same person who can approve changes also has access to implement them, they can bypass controls and execute unauthorized modifications without independent verification, creating fraud risk and control circumvention.

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Therapeutics and Patient Care QUESTION #3889

Question 3036

Which laxative is associated with the highest risk of dependency and tolerance when taken chronically over a prolonged period?

Psyllium
Bisacodyl✔️
Docusate
Sorbitol

Correct Answer Logic:

Stimulant laxatives such as bisacodyl can cause hypotonicity of the bowel and laxative dependency with chronic overuse. Bulk-forming, osmotic, and softener laxatives have a lower dependency risk.

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Security Measures to Maintain Law and Order QUESTION #7669

Question 3037

'Junior ranks' means members of the police below the rank of _______ as set out in the First Schedule.

Inspector
DSP
Sub-inspector✔️
All of these

Correct Answer Logic:

According to the Police Order 2002 and police organizational structure in Pakistan, 'Junior ranks' typically refers to police personnel below the rank of Sub-Inspector (SI). This includes constables, head constables, and assistant sub-inspectors.

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