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ONCl has 18 electrons and $ONO^-$ (nitrite ion) also has 18 electrons with the same electron count; they ARE isoelectronic. So the statement that they are NOT isoelectronic is WRONG. $O_3$ is indeed bent (bond angle ~117°), ozone solid is violet-black, and ozone is diamagnetic — all correct statements.

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Biology QUESTION #557

Question 4

Herpes simplex is caused by __________ virus.

Enveloped RNA✔️
RNA tumor
Glycogen
Both B and C

Correct Answer Logic:

Answer key shows X (cancelled question)

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Home Economics QUESTION #6274

Question 5

Which chromosome abnormality is the primary cause of Down Syndrome?

XXY Syndrome
Trisomy 21✔️
Monosomy X
Trisomy 18

Correct Answer Logic:

Down Syndrome occurs when an individual has a full or partial extra copy of chromosome 21.

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Computer Science QUESTION #1147

Question 6

Which join returns all records when there is a match in either left or right table?

Inner Join
Left Join
Full Outer Join✔️
Right Join

Correct Answer Logic:

A Full Outer Join combines the results of both Left and Right outer joins and returns all rows from both tables, filling with NULLs where matches are missing.

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Accounting Finance and Punjab Sales Tax on Services QUESTION #2581

Question 7

Under section 14(2), who may be required to withhold full or part of tax charged on taxable services — a power that extends even to unregistered persons?

Only registered persons with annual turnover exceeding the threshold
Any person or class of persons WHETHER REGISTERED OR NOT, as notified by the Authority✔️
Only persons who are themselves service providers
Only banks and financial institutions

Correct Answer Logic:

Section 14(2) explicitly states that the Authority may require ANY PERSON OR CLASS OF PERSONS WHETHER REGISTERED OR NOT for the purpose of this Act to withhold full or part of the tax charged, and deposit it with the Government in the prescribed manner.

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Mathematics QUESTION #4095

Question 8

For $f(x,y)=xy-2x$ on the triangular region with vertices $(0,0),(4,0),(0,4)$, evaluating on the edge from $(0,4)$ to $(4,0)$ (line $x+y=4$, i.e., $y=4-x$), $f$ becomes a function of $x$ only as:

\$f = x(4-x)-2x = -x^2+2x\$✔️
$f = 4x-x^2$
$f = x(4-x)-2x = -x^2+2x$
\$f = 4x-2x = 2x\$

Correct Answer Logic:

Substitute $y=4-x$ into $f=xy-2x$: $f=x(4-x)-2x=4x-x^2-2x=-x^2+2x$. Maximizing: $f'=-2x+2=0\Rightarrow x=1$, giving $f(1,3)=-1+2=1$. This is a candidate for absolute extremum.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3256

Question 9

'Hyperventilation' (rapid deep breathing) leads to:

High $CO_2$ levels
Respiratory Alkalosis (low $CO_2$ and high $pH$)✔️
Respiratory Acidosis
Increased $O_2$ in tissues

Correct Answer Logic:

Blowing off too much $CO_2$ makes the blood more alkaline.

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

Question 10

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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MCQs Section QUESTION #4871

Question 11

Correct antonym of "BI-PARTISAN" is

Narrow minded✔️
Progressive
Representing two parties
Divided

Correct Answer Logic:

Bi-partisan means involving cooperation between two political parties. Its antonym is 'narrow minded,' implying a refusal to cooperate or consider opposing viewpoints.

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Chemistry QUESTION #1002

Question 12

Statement (I): Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test. Statement (II): The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.

Statement I is false but Statement II is true
Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is true but Statement II is false✔️

Correct Answer Logic:

Statement I is correct — N, S, halogens, and P are detected by Lassaigne's test. Statement II is false — the compound is fused with sodium (Na), not magnesium (Mg), to convert covalent bonds into ionic form (e.g., $\text{NaCN, Na}_2\text{S, NaX}$).

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Basic Mathematics QUESTION #2859

Question 13

Solve: $x^2 - 7x + 12 = 0$

x = 3 and x = 4✔️
x = -3 and x = 4
x = 3 and x = -4
x = -3 and x = -4

Correct Answer Logic:

Factorizing: $x^2 - 7x + 12 = (x-3)(x-4) = 0$. So $x = 3$ or $x = 4$. Check: $3 \times 4 = 12$ ✓ and $3 + 4 = 7$ ✓.

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English QUESTION #2736

Question 14

Convert to PASSIVE VOICE: 'Will they announce the result?'

Will the result be announced by them?✔️
Will the result announced by them?
The result will be announced.
Was the result announced by them?

Correct Answer Logic:

In passive voice for future simple questions: Will + object + be + past participle + by + agent. 'Will the result be announced by them?' is correct.

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General Knowledge QUESTION #283

Question 15

___________ is the current Chancellor of Germany.

Angela Merkel
Olaf Scholz✔️
Robert Habeck
None of these

Correct Answer Logic:

Olaf Scholz assumed office as Chancellor in December 2021.+1

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Commerce QUESTION #6110

Question 16

A business paid $5,750 for advertising; $500 relates to next year (prepayment). How does correct treatment affect the financial statements compared to leaving it untreated?

Option	Profit for the Year	Current Assets
A	Decrease	Decrease
B	Decrease	Increase
C	Increase	Decrease
D	Increase	Increase

Option A
Option B
Option C
Option D✔️

Correct Answer Logic:

Option D is correct.

Profit increases: Removing $500 from advertising expense reduces expenses → profit rises by $500.
Current assets increase: The $500 prepayment is recorded as a current asset on the SFP.

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Urdu QUESTION #4469

Question 17

Translate: لاہور باغات کیلئے مشہور ہے۔ (Lahore is famous for gardens.)

Lahore was known for gardens.
Lahore will be known for gardens.
Lahore were known for gardens.
None of these✔️

Correct Answer Logic:

The original sentence is in the present tense ('hai'), while the options provided are in past or future tense. Therefore, 'None of these' is correct.

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Islamic Studies QUESTION #330

Question 18

What was the original name of the host of the Prophet (ﷺ), Abu Ayub Ansari (RA)?

Zaid bin Thabit
Khalid bin Zaid✔️
Qais bin Saad
Hanzla bin Aamir

Correct Answer Logic:

His original name was Khalid bin Zaid bin Kulayb.

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Biology Zoology Botany QUESTION #1369

Question 19

The study of heritable changes in gene expression without alteration in the underlying DNA sequence is called:

Epigenetics✔️
Genetics
Genomics
Evolutionary biology

Correct Answer Logic:

Epigenetics is the study of heritable changes in gene expression that do not involve changes to the underlying DNA sequence. Mechanisms include DNA methylation, histone modification, and non-coding RNA regulation. These changes can be influenced by the environment and may be passed from parent to offspring, affecting gene activity without altering the genetic code.

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Commerce QUESTION #6108

Question 20

A sales invoice to Jane was not recorded in any book of prime entry. Which accounts are affected?

Option	Sales Ledger Control Account	Jane's Personal Account
A	No	No
B	No	Yes
C	Yes	No
D	Yes	Yes

Option A✔️
Option B
Option C
Option D

Correct Answer Logic:

Option A is correct.

Since the invoice was never entered in any book of prime entry, no postings were made anywhere — neither the control account nor Jane's personal account is affected. This is a complete error of omission.

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