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Sodium metabisulphite is an antioxidant added to prevent the oxidative degradation of epinephrine, which is highly susceptible to oxidation. It preserves potency and shelf life.

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Commerce QUESTION #1229

Question 1546

A zero-coupon bond sells for \$250. At maturity in 16 years, it will be redeemed for \$1{,}000. What approximate annual rate of growth does this represent?

8 percent✔️
9 percent
12 percent
25 percent

Correct Answer Logic:

Using the future value formula: $FV = PV \times (1+r)^n$. So $1000 = 250\times(1+r)^{16}$. $(1+r)^{16} = 4$. $1+r = 4^{1/16} = 4^{0.0625}$. $\ln(1+r) = \frac{\ln 4}{16} = \frac{1.386}{16} = 0.0866$. $1+r = e^{0.0866} \approx 1.0905$. So $r \approx 9\%$. Wait: $4^{1/16}$: $\log(4)/16 = 0.602/16=0.0376$, antilog $=1.089$, so $r\approx 9\%$ = option (B). Re-examining: $4^{0.0625}=1.0905\Rightarrow r\approx9\%$. Answer: option (B) = 9 percent.

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Electrical Engineering QUESTION #2187

Question 1547

A long straight conductor carries $I = 10\,\text{A}$. The magnetic flux density $B$ at a perpendicular distance $r = 2\,\text{cm}$ from it (in free space) is:

$100\,\mu\text{T}$✔️
$50\,\mu\text{T}$
$200\,\mu\text{T}$
$25\,\mu\text{T}$

Correct Answer Logic:

$B = \frac{\mu_0 I}{2\pi r} = \frac{4\pi\times10^{-7}\times10}{2\pi\times0.02} = \frac{4\times10^{-6}}{0.04\pi}\times\pi = \frac{4\times10^{-6}}{0.04} = 10^{-4}\,\text{T} = 100\,\mu\text{T}$.

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Pakistan Affairs QUESTION #136

Question 1548

Pakistan conducted its nuclear tests in Chaghi in:

1998✔️
1997
1999
1996

Correct Answer Logic:

Pakistan conducted five simultaneous underground nuclear tests at Ras Koh Hills in the Chagai District on May 28, 1998.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3005

Question 1549

The 'Creaming' of an emulsion is:

A permanent separation
A reversible separation where globules rise or sink✔️
The complete breaking of the emulsion
A bacterial infection

Correct Answer Logic:

Creaming is the migration of globules to the top or bottom; it is usually reversible by shaking.

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Electrical Engineering QUESTION #2185

Question 1550

A $100\,\text{kVA}$, $11\,\text{kV}/400\,\text{V}$ transformer has iron losses $P_i = 500\,\text{W}$ and full-load copper losses $P_{cu} = 1200\,\text{W}$. The efficiency at half full-load and $0.8$ pf lagging is:

$98.0\%$✔️
$96.1\%$
$97.3\%$
$94.5\%$

Correct Answer Logic:

Output at half load $= 0.5\times100\times10^3\times0.8 = 40{,}000\,\text{W}$. Cu loss $= (0.5)^2\times1200 = 300\,\text{W}$. Iron loss $= 500\,\text{W}$ (constant). $\eta = \frac{40000}{40000+800}\times100 = \frac{40000}{40800} \approx 98.0\%$.

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Tourism & Hospitality Management QUESTION #1585

Question 1551

The concept of 'key actors in sustainable tourism' as covered in the Sustainable Tourism course includes which of the following stakeholder groups?

Only the government and private hotel industry
The Public Actors, Industry (tour operators/hoteliers), Voluntary Sector, Host Community, Media, Tourists, and NGOs/INGs✔️
Tourists, travel agents, and national parks only
Local community, international tourists, and UNESCO only

Correct Answer Logic:

The Sustainable Tourism course identifies seven key actor groups: Public Actors, the Industry (tour operators/hoteliers), the Voluntary Sector, the Host Community, the Media, the Tourist, and NGOs/INGOs — each with distinct roles and responsibilities in achieving sustainability.

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Chemistry QUESTION #459

Question 1552

CaO forms fertilize slag by reacting with

P?O?
Fe?O?
Silica✔️
FO

Correct Answer Logic:

CaO + SiO? ? CaSiO? (slag)

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Physics QUESTION #989

Question 1553

An electron projected perpendicular to a uniform magnetic field $B$ moves in a circle. If Bohr's quantization is applicable, then the radius of the electronic orbit in the first excited state is:

$\sqrt{\dfrac{h}{\pi eB}}$✔️
$\sqrt{\dfrac{2h}{\pi eB}}$
$\sqrt{\dfrac{h}{2\pi eB}}$
$\sqrt{\dfrac{4h}{\pi eB}}$

Correct Answer Logic:

By Bohr quantization: $mvr = \frac{nh}{2\pi}$. For circular motion in $B$: $mv = eBr$. So $eBr^2 = \frac{nh}{2\pi} \Rightarrow r = \sqrt{\frac{nh}{2\pi eB}}$. First excited state: $n=2$ gives $r=\sqrt{\frac{2h}{2\pi eB}}=\sqrt{\frac{h}{\pi eB}}$.

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Biology QUESTION #4239

Question 1554

How do the kidneys contribute to maintain normal blood calcium level?

By storing excess calcium
By reabsorbing calcium and activating vitamin D✔️
By secreting calcium directly into the blood
By converting calcium into urea for excretion

Correct Answer Logic:

Kidneys reabsorb $\text{Ca}^{2+}$ and activate vitamin D.

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Commerce QUESTION #1226

Question 1555

Which of the following enjoys limited liability?

A general partnership.
A corporation.✔️
A sole proprietorship.
None of these

Correct Answer Logic:

A corporation (company) is a separate legal entity from its owners (shareholders). Shareholders enjoy limited liability — their personal assets are protected, and they can only lose the amount they invested. In a general partnership, all partners have unlimited personal liability. In a sole proprietorship, the owner has unlimited liability.

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