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Accounting Finance and Punjab Sales Tax on Services QUESTION #2555

Under section 16(1) of the Punjab Sales Tax on Services Act, 2012, a registered person entitled to claim input tax adjustment must hold a valid tax invoice not older than how many tax periods?

Three tax periods
Six tax periods✔️
Eight tax periods
Twelve tax periods

Correct Answer Logic:

Section 16(1) explicitly states that the registered person must hold a true and valid tax invoice not older than six tax periods showing the amount of tax charged under the Act on the services received.

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Islamic Studies QUESTION #7895

Question 2

What is the total number of Ayaats (verses) in the Holy Quran?

5445
7277
4344
6236✔️

Correct Answer Logic:

The Holy Quran contains 6236 Ayaats (verses) according to the most common count. However, different methods of counting yield slightly different numbers ranging from 6204 to 6236. The Quran has 114 Surahs, 30 Parts (Juz), and approximately 77,000 words.

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Physics and Math QUESTION #788

Question 3

A dice is rolled, what is the probability of getting a number greater than 4?

$\dfrac{1}{4}$
$\dfrac{1}{3}$✔️
$\dfrac{1}{2}$
$\dfrac{1}{6}$

Correct Answer Logic:

Numbers greater than 4: {5, 6} → 2 outcomes out of 6. Probability $= \dfrac{2}{6} = \dfrac{1}{3}$.

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Chemistry QUESTION #7533

Question 4

Hydrogen peroxide oxidizes $[\text{Fe(CN)}_6]^{4-}$ to $[\text{Fe(CN)}_6]^{3-}$ in acidic medium, and reduces $[\text{Fe(CN)}_6]^{3-}$ to $[\text{Fe(CN)}_6]^{4-}$ in alkaline medium. What are the other products formed in these two reactions, respectively?

H$_2$O and (H$_2$O + O$_2$)
H$_2$O and (H$_2$O + OH$^-$)
(H$_2$O + O$_2$) and H$_2$O✔️
(H$_2$O + O$_2$) and (H$_2$O + OH$^-$)

Correct Answer Logic:

Acidic medium (oxidising agent):
$[\text{Fe(CN)}_6]^{4-} + H_2O_2 + 2H^+ \to [\text{Fe(CN)}_6]^{3-} + \text{H}_2\text{O}$
H$_2$O$_2$ is reduced to H$_2$O. Other product: H$_2$O.

Alkaline medium (reducing agent):
$H_2O_2 \to H_2O + \frac{1}{2}O_2$ (H$_2$O$_2$ is oxidized)
$2[\text{Fe(CN)}_6]^{3-} + H_2O_2 + 2OH^- \to 2[\text{Fe(CN)}_6]^{4-} + O_2 + 2H_2O$
Other products: H$_2$O and O$_2$.

So the pair is: H$_2$O (acidic) and (H$_2$O + O$_2$) (alkaline).

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Physics QUESTION #7067

Question 5

A planet of mass $m$ moves in a circular orbit around the Sun. If its angular momentum about the center of the Sun is $L$, determine its areal velocity.

$\frac{L}{m}$
$\frac{4L}{m}$
$\frac{L}{2m}$✔️
$\frac{2L}{m}$

Correct Answer Logic:

Areal velocity is defined as the area swept by the position vector per unit time: $\frac{dA}{dt}$.

In polar coordinates, $dA = \frac{1}{2} r^2 d\theta$.
So, $\frac{dA}{dt} = \frac{1}{2} r^2 \frac{d\theta}{dt} = \frac{1}{2} r^2 \omega$.

Since angular momentum $L = m r^2 \omega$, we can substitute $r^2 \omega = \frac{L}{m}$.

Therefore, $\text{Areal Velocity} = \frac{1}{2} \left( \frac{L}{m} \right) = \frac{L}{2m}$.

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Boilers Mechanical Engineering QUESTION #2522

Question 6

For a rigid body in general planar motion, the angular momentum principle about the center of mass G gives:

$\sum M_G = I_G\,\alpha$✔️
$\sum M_G = I_G\,\omega^2$
$\sum M_G = m\,a_G$
$\sum M_G = I_G\,\omega + m v_G r$

Correct Answer Logic:

For a rigid body, the rotational equation about the center of mass G is $\sum M_G = I_G\,\alpha$, where $I_G$ is the mass moment of inertia about G and $\alpha=\dot{\omega}$ is the angular acceleration.

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Physics QUESTION #4390

Question 7

If a body having mass $m_1 = 2\ kg$ moving with $5\ m/s$ approaches another mass $m_2 = 3\ kg$ with $1\ m/s$ in the same direction, relative speed of approach is $4\ m/s$. Relative speed of separation after collision will be:

$4\ m/s$✔️
$2\ m/s$
$6\ m/s$
Depends on masses

Correct Answer Logic:

By the law of conservation of momentum and the coefficient of restitution for elastic collisions: relative speed of approach $=$ relative speed of separation. Since relative speed of approach $= 5 - 1 = 4\ m/s$, the relative speed of separation $= 4\ m/s$.

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Physical Education QUESTION #6817

Question 8

Which statement best reflects the 'Perennialist' view of Physical Education?

Physical activities should change every year to follow trends
Physical education should focus on timeless values and classic sports that develop discipline✔️
Physical education should be abolished in favor of technology
Sports should only be played if they are profitable

Correct Answer Logic:

Perennialism values education that focuses on 'everlasting' truths and the disciplined development of the human character through traditional means.

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Islamic Studies QUESTION #7913

Question 9

Who was the 1st Muslim Caliph of Spain?

Abd Al-Rehman AD-Dakhil✔️
Abd Al-Jabbar
Abd Al-Malik
Hashim II bin Al-Hakam

Correct Answer Logic:

Abd al-Rahman I (AD-Dakhil) was the first Muslim ruler of Spain, establishing the Emirate of Córdoba in 756 CE. He was an Umayyad prince who escaped the Abbasid massacre and reached Spain, where he established Umayyad rule that lasted for centuries, making Córdoba a center of learning and culture.

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Boilers Mechanical Engineering QUESTION #3997

Question 10

Operating a boiler without a 'Valid Certificate' is considered:

A minor oversight
An illegal act subject to penalties and fines✔️
Allowed if the boiler is new
Allowed if no accident happens

Correct Answer Logic:

The law strictly prohibits the use of uncertified boilers to prevent loss of life and property.

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General Abilities QUESTION #2885

Question 11

Solve for $x$: $4x - 7 = 2x + 5$

3
6✔️
4
12

Correct Answer Logic:

$4x - 2x = 5 + 7 \implies 2x = 12 \implies x = 6$.

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English QUESTION #8524

Question 12

The swimmers should avoid _______ contaminated swimming pool.

entering✔️
being entered
to enter
have entered

Correct Answer Logic:

'Avoid entering' is the correct gerund pattern.

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General Abilities QUESTION #4589

Question 13

Two numbers are in ratio $7:9$. If their sum is $64$, what is the larger number?

$28$
$36$✔️
$32$
$56$

Correct Answer Logic:

Total parts = $7+9=16$. Larger = $\frac{9}{16} \times 64 = 36$

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Agronomy QUESTION #2114

Question 14

The 'denitrification-decomposition' (DNDC) model and similar biogeochemical models are used in agronomy to:

Design crop rotation sequences that maximize grain yield only
Simulate carbon and nitrogen cycling, greenhouse gas emissions ($CO_2$, $CH_4$, $N_2O$), and crop growth responses to management practices and climate scenarios — enabling scenario analysis for climate-smart agriculture planning without costly field experiments✔️
Predict weed population dynamics under different herbicide programs
Calculate economic returns from different fertilizer application strategies

Correct Answer Logic:

DNDC (Li et al., 1992) is a process-based model simulating soil C and N biogeochemistry: decomposition, nitrification, denitrification, fermentation (CH₄ in paddy), and plant growth. It uses weather, soil, vegetation, and management inputs to predict N₂O, CH₄, CO₂ emissions and crop yields under different scenarios. It is widely used for national GHG inventories, climate-smart agriculture planning, and designing mitigation strategies for agricultural emissions.

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Civil Engineering QUESTION #6598

Question 15

In a one-way slab system, the structural load transfer occurs primarily in the:

Short direction✔️
Long direction
Either short or long direction
Both short and long directions equally

Correct Answer Logic:

A one-way slab is designed so that bending and load transfer occur predominantly in the short direction (spanning direction), where $L_{long}/L_{short} \geq 2$. The short-span strips carry essentially all the load.

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Chemistry QUESTION #7370

Question 16

The maximum number of orbitals that can be identified with quantum numbers $n=3$, $\ell=1$, $m_\ell=0$ is:

1✔️
2
3
4

Correct Answer Logic:

For $n=3, \ell=1, m_\ell=0$: all three quantum numbers are fixed. This uniquely specifies one orbital — the $3p_z$ orbital (or whichever p-orbital corresponds to $m=0$). A specific orbital is defined by its set of $n$, $\ell$, and $m$. Only the spin quantum number $m_s$ remains free.

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General Abilities QUESTION #2814

Question 17

The average of five numbers is 42. If one number is 60, what is the average of the remaining four?

37.5✔️
38
38.5
39

Correct Answer Logic:

Sum of all five $= 42 \times 5 = 210$. Remaining sum $= 210 - 60 = 150$. Average of remaining four $= \dfrac{150}{4} = 37.5$.

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Electrical Engineering QUESTION #2141

Question 18

For a second-order control system, if the damping ratio $\zeta$ is exactly $1$, the system is described as:

Underdamped
Overdamped
Critically damped✔️
Undamped

Correct Answer Logic:

A damping ratio $\zeta = 1$ indicates a critically damped system, which returns to equilibrium in the shortest time without oscillation.

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Civil Engineering QUESTION #6596

Question 19

According to ACI 318-95 load combination recommendations, the load factor applied to wind load $W$ is:

1.4
1.7
1.3✔️
0.9

Correct Answer Logic:

Per ACI 318-95, the load combination including wind is $U = 0.75(1.4D + 1.7L + 1.7W)$, giving an effective wind load factor of $0.75 \times 1.7 = 1.275 \approx 1.3$. Also used as $1.3W$ directly in some combinations.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3622

Question 20

Which drug is used as a 'Demulcent' and is obtained from 'Plantago ovata'?

Ispaghula (Psyllium)✔️
Senna
Digitalis
Cinnamon

Correct Answer Logic:

Ispaghula husk is a bulk-forming laxative and demulcent.

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