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Biology QUESTION #7263

Select one of the following pairs of important features that distinguish Gnetum from Cycas and Pinus and show affinities with angiosperms:

Perianth and two integuments
Embryo development and apical meristem
Absence of resin duct and leaf venation
Presence of vessel elements and absence of archegonia✔️

Correct Answer Logic:

Gnetum is unique among gymnosperms in having vessel elements in the xylem (like angiosperms) and absence of archegonia in the female gametophyte (like angiosperms). These two features bring it closest to the angiosperms among all gymnosperms and are strong indicators of angiosperm affinity.

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Boilers Mechanical Engineering QUESTION #2406

Question 2

For geometric similitude between model and prototype, if the linear scale ratio is $L_r = L_m/L_p$, the area ratio is:

$A_r = L_r$
$A_r = L_r^3$
$A_r = L_r^2$✔️
$A_r = L_r^{1/2}$

Correct Answer Logic:

For geometric similitude: all corresponding lengths scale by $L_r=L_m/L_p$. Areas scale as $A_r=L_r^2$, volumes scale as $V_r=L_r^3$.

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Physics QUESTION #7040

Question 3

The diameter and height of a cylinder are $12.6 \pm 0.1 \text{ cm}$ and $34.2 \pm 0.1 \text{ cm}$ respectively. Calculate its volume using appropriate significant figures.

$4264 \pm 81 \text{ cm}^3$
$4264.4 \pm 81.0 \text{ cm}^3$
$4260 \pm 80 \text{ cm}^3$✔️
$4300 \pm 80 \text{ cm}^3$

Correct Answer Logic:

Volume $V = \frac{\pi d^2 h}{4} = \frac{\pi \times 12.6^2 \times 34.2}{4} \approx 4262.2 \text{ cm}^3$.

Since inputs have 3 significant figures, $V \approx 4260 \text{ cm}^3$.

Error calculation: $\frac{\Delta V}{V} = 2\frac{\Delta d}{d} + \frac{\Delta h}{h}$

$\Delta V = 4260 \left( 2 \frac{0.1}{12.6} + \frac{0.1}{34.2} \right) \approx 4260 (0.01587 + 0.00292) \approx 80 \text{ cm}^3$.

Final value: $4260 \pm 80 \text{ cm}^3$.

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Physics QUESTION #7071

Question 4

Two Carnot engines, A and B, operate in series. Engine A receives heat at $T_1 = 600 \text{ K}$ and rejects it to a reservoir at $T_2$. Engine B receives this rejected heat and rejects it to a sink at $T_3 = 400 \text{ K}$. If both engines produce the same amount of work, find $T_2$.

$600 \text{ K}$
$400 \text{ K}$
$300 \text{ K}$
$500 \text{ K}$✔️

Correct Answer Logic:

For two Carnot engines in series where the work output is equal ($W_A = W_B$):

$Q_1 - Q_2 = Q_2 - Q_3$

Since $Q \propto T$ for a Carnot cycle, we can write:
$T_1 - T_2 = T_2 - T_3$

Rearranging for $T_2$:
$2T_2 = T_1 + T_3 \implies T_2 = \frac{600 + 400}{2} = 500 \text{ K}$.

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English QUESTION #8409

Question 5

He is very particular _______ his clothes.

to
with
about✔️
for

Correct Answer Logic:

'Particular about' means fussy or selective.

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Math Physics Chemistry Biology QUESTION #4210

Question 6

The hormone, when overproduced can lead to hypercalcemia and stone formation is:

Insulin
Thyroxine
Parathyroid hormone✔️
Antidiuretic hormone

Correct Answer Logic:

Excess parathyroid hormone causes hypercalcemia.

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English QUESTION #8332

Question 7

He is interested _______ stamp collection.

at
in✔️
of
with

Correct Answer Logic:

'Interested in' is the correct preposition.

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Biology Zoology Botany QUESTION #10815

Question 8

Agents that cause uncontrolled, neoplastic growth of cells are called:

Teratogens
Carcinogens✔️
Mutagens
Heavy metals

Correct Answer Logic:

Carcinogens are agents that initiate or promote uncontrolled neoplastic (cancerous) cell growth by causing DNA damage, chromosomal mutations, or disrupting cell cycle regulation. Examples include ionising radiation, tobacco smoke (polycyclic aromatic hydrocarbons), asbestos, benzene, and certain viruses (HPV, HBV). Teratogens cause birth defects; mutagens cause genetic mutations (which may or may not lead to cancer); heavy metals can be carcinogenic but the broad term is carcinogen.

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MCQs Section QUESTION #5125

Question 9

شیخ علی وجودی، کاظم جنوبی کس ناول کے کردار ہیں؟

آگ کا دریا
آنگن
فردوسِ بریں✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

یہ کردار عبدالحلیم شرر کے مشہور تاریخی ناول 'فردوسِ بریں' سے ہیں۔

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Physics QUESTION #7300

Question 10

A body starts from rest and moves under constant acceleration for 20 s. It covers distance $S_1$ in the first 10 s and $S_2$ in the next 10 s. Then $S_2$ equals:

$S_1$
$2S_1$
$3S_1$✔️
$4S_1$

Correct Answer Logic:

Using $s = \dfrac{1}{2}at^2$ (from rest):

$S_1 = \dfrac{1}{2}a(10)^2 = 50a$

Total in 20 s: $S_{\text{total}} = \dfrac{1}{2}a(20)^2 = 200a$

$S_2 = 200a - 50a = 150a = 3 \times 50a = \mathbf{3S_1}$

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5781

Question 11

Under Section 23 of the Drug Act, selling a drug without a valid warranty from the manufacturer is:

Legal
A minor offence
A prohibited act✔️
Encouraged

Correct Answer Logic:

Section 23 forbids selling drugs without a manufacturer's warranty[cite: 7].

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Psychology QUESTION #9752

Question 12

For a hungry individual, food would most appropriately be classified as a:

Primary reinforcer✔️
Secondary reinforcer
None of these
Neutral stimulus

Correct Answer Logic:

A primary reinforcer directly satisfies a biological need without prior learning. Food satisfies the biological drive of hunger immediately, making it a primary — not secondary — reinforcer.

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MCQs Section QUESTION #4837

Question 13

Pick the word nearly similar in meaning to "ANATHEMA"

Curse✔️
Cure
Anemia
Asthma

Correct Answer Logic:

Anathema means a formal curse or something or someone greatly detested or loathed. Example: Corruption is anathema to good governance.

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General Knowledge QUESTION #4792

Question 14

In which year did the British government transfer Kashmir to Gulab Singh?

1846✔️
1845
1843
1848

Correct Answer Logic:

Under the Treaty of Amritsar in 1846, the British sold Kashmir to Maharaja Gulab Singh for 7.5 million Nanakshahis, making him the Maharaja of Jammu and Kashmir.

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Ability / HR / Governance / Special Education QUESTION #1855

Question 15

Promotions and transfers to posts in BPS 19 to 21 shall be made on the recommendation of which body?

Departmental Promotion Committee
Federal Public Service Commission
Selection Boards✔️
Establishment Division

Correct Answer Logic:

Rule 7 states that promotions and transfers to posts in BPS 19 to 21 and equivalent shall be made on the recommendation of the Selection Boards.

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Physics QUESTION #1054

Question 16

Martian orbit radius $\approx4\times$ Mercury orbit radius. Martian year $=687$ Earth days. Length of 1 year on Mercury:

172 earth days
124 earth days
88 earth days✔️
225 earth days

Correct Answer Logic:

Kepler's 3rd law: $T^2\propto r^3$. $\frac{T_{Mer}^2}{T_{Mar}^2}=\frac{r_{Mer}^3}{r_{Mar}^3}=\frac{1}{4^3}=\frac{1}{64}$. $T_{Mer}=\frac{T_{Mar}}{8}=\frac{687}{8}\approx86\approx88\ \text{earth days}$.

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Dairy Food Science and Technology QUESTION #5883

Question 17

Sweetened condensed milk (SCM) is preserved by:

Heat sterilization at $121^{\circ}\text{C}$ for $15$ minutes
High osmotic pressure created by sucrose addition, reducing water activity to $a_w \approx 0.83$✔️
Addition of chemical preservatives like sodium benzoate
Vacuum packaging with nitrogen flushing

Correct Answer Logic:

SCM preservation relies on high osmotic pressure. Sucrose is added to achieve $a_w \approx 0.83$ and sucrose concentration of $\approx 43\text{–}45\%$ in the final product, inhibiting microbial growth without sterilization which would cause browning and gelling.

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Mathematics QUESTION #11148

Question 18

$\displaystyle\lim_{n\to\infty}\left(1+\frac{z}{n}\right)^n$ is:

$1$
$0$
$e^z$✔️
$e^n$

Correct Answer Logic:

This is the standard limit definition of the complex exponential: $\displaystyle\lim_{n\to\infty}\left(1+\frac{z}{n}\right)^n = e^z$ for all $z\in\mathbb{C}$. This generalises the real limit $\lim_{n\to\infty}(1+x/n)^n = e^x$ to the complex plane.

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