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Math Physics Chemistry Biology QUESTION #7749

Sharks belong to which class of vertebrates?

Chondrichthyes✔️
Echinodermata
Osteichthyes
Urochordata

Correct Answer Logic:

Class Chondrichthyes includes cartilaginous fish (sharks, rays). Osteichthyes are bony fish. Echinodermata are starfish etc.; Urochordata are tunicates.

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Electrical Engineering QUESTION #2139

Question 2342

A $4$-pole induction motor is supplied by a $50\text{ Hz}$ source. If the slip $s$ is $0.04$, what is the actual speed of the rotor $N_r$ in RPM?

$1500\text{ RPM}$
$1440\text{ RPM}$✔️
$1410\text{ RPM}$
$1560\text{ RPM}$

Correct Answer Logic:

Synchronous speed $N_s = \frac{120f}{P} = \frac{120 \times 50}{4} = 1500\text{ RPM}$. Rotor speed $N_r = N_s(1 - s) = 1500(1 - 0.04) = 1440\text{ RPM}$.

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Mathematics QUESTION #6036

Question 2343

Two complex numbers $z_1$ and $z_2$ satisfy $|z_2|=1$ and $\dfrac{z_1-2z_2}{2-z_1\bar{z}_2}$ is unimodular, but $z_2$ is not unimodular. Where does $z_1$ lie?

On a line parallel to the $x$-axis
On a line parallel to the $y$-axis
On a circle of radius 2✔️
On a circle of radius $\sqrt{2}$

Correct Answer Logic:

Let $w = \frac{z_1-2z_2}{2-z_1\bar{z}_2}$, with $|w|=1$.

$|z_1-2z_2|^2 = |2-z_1\bar{z}_2|^2$

$(z_1-2z_2)\overline{(z_1-2z_2)} = (2-z_1\bar{z}_2)\overline{(2-z_1\bar{z}_2)}$

$|z_1|^2 - 2z_1\bar{z}_2 - 2\bar{z}_1z_2 + 4|z_2|^2 = 4 - 2z_1\bar{z}_2 - 2\bar{z}_1z_2 + |z_1|^2|z_2|^2$

$|z_1|^2 + 4|z_2|^2 = 4 + |z_1|^2|z_2|^2$

$|z_1|^2(1-|z_2|^2) = 4(1-|z_2|^2)$

Since $|z_2|\neq1$: $|z_1|^2=4\Rightarrow|z_1|=2$. So $z_1$ lies on a circle of radius 2.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #2999

Question 2344

A 'Mouthwash' is primarily used for its:

Systemic effect
Local effect on oral mucosa✔️
Nutritional value
Lubrication of the throat

Correct Answer Logic:

Mouthwashes are aqueous solutions used for their deodorant, antiseptic, or astringent action in the oral cavity.

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General Knowledge QUESTION #4754

Question 2345

The world's largest producer of uranium is which country?

Australia
Canada✔️
South Africa
Kazakhstan

Correct Answer Logic:

Canada has been historically one of the world's largest uranium producers, though Kazakhstan surpassed it in recent years. Canada was the correct answer at the time this question was set.

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Biology Zoology Botany QUESTION #1341

Question 2346

Prader-Willi syndrome is the heterozygous deletion in the long arm of chromosome at:

5
15✔️
3
None of these

Correct Answer Logic:

Prader-Willi syndrome results from loss of function of genes on the paternal copy of chromosome 15q11-q13 (long arm of chromosome 15). This is typically due to a deletion in the paternal chromosome 15. The same region, when deleted from the maternal chromosome, causes Angelman syndrome — a classic example of genomic imprinting.

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Boilers Mechanical Engineering QUESTION #2378

Question 2347

For a differentiating (D) control element with gain $K_D$, the transfer function is:

$Y(s) = K_D / s$
$Y(s) = K_D$
$Y(s) = K_D s$✔️
$Y(s) = K_D s^2$

Correct Answer Logic:

A differentiating element: $x_o(t)=K_D \dot{x}_i(t)$, so $X_o(s)=K_D s X_i(s)$, giving $Y(s)=K_D s$. Differentiation in time corresponds to multiplication by $s$ in the Laplace domain.

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General Knowledge QUESTION #8694

Question 2348

The Kyoto Protocol is an international treaty related to which issue?

Refugees
Human Rights
Child Labour
Environment (climate change)✔️

Correct Answer Logic:

The Kyoto Protocol addresses greenhouse gas emissions.

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General Knowledge QUESTION #8691

Question 2349

How many Round Table Conferences were held in London between Indian leaders and the British government?

1
2
3✔️
4

Correct Answer Logic:

Three Round Table Conferences (1930-1932) — so answer 3. Key says C.

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Egnlish QUESTION #695

Question 2350

Which of these is a hallmark of "Post-Modernist" literature?

Linear narrative
Metafiction✔️
Objective truth
None of these

Correct Answer Logic:

Post-modernism often uses metafiction (writing about writing) to question the nature of reality and narrative.

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Security Measures to Maintain Law and Order QUESTION #907

Question 2351

"Behavioral Detection" (BD) is a security measure used to maintain order by identifying:

Expired passports
Micro-expressions of fear/stress✔️
Ticket fraud
Weight of luggage

Correct Answer Logic:

BD personnel look for non-verbal cues that indicate a person may be planning an act of unlawful interference.

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English QUESTION #8326

Question 2352

Tick the word SIMILAR in meaning to: Apparel

clothes✔️
luggage
impression
outlook

Correct Answer Logic:

Apparel means clothing.

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Mathematics QUESTION #4108

Question 2353

The Maclaurin series $\displaystyle f(Z)=Z^2e^{3Z}=\sum_{n=0}^{\infty}\dfrac{3^nZ^{n+2}}{n!}$. The coefficient of $Z^5$ in this series is:

$\dfrac{27}{6}$✔️
$\dfrac{9}{2}$
$9$
$\dfrac{81}{24}$

Correct Answer Logic:

The coefficient of $Z^5$ corresponds to $n+2=5\Rightarrow n=3$: coefficient $=\dfrac{3^3}{3!}=\dfrac{27}{6}=\dfrac{9}{2}$. Verify: $\dfrac{27}{6}=\dfrac{9}{2}$ — both options 1 and 2 are the same value. The coefficient is $\dfrac{9}{2}$.

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General Abilities QUESTION #3968

Question 2354

Calculate the value of the cube of $\frac{1}{3}$.

$\frac{3}{9}$✔️
$\frac{3}{27}$
$\frac{1}{81}$
$\frac{1}{27}$

Correct Answer Logic:

3

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General Abilities QUESTION #4544

Question 2355

What is $\frac{2}{5} \div \frac{3}{4}$?

$\frac{6}{20}$
$\frac{8}{15}$✔️
$\frac{3}{10}$
$\frac{5}{6}$

Correct Answer Logic:

$\frac{2}{5} \div \frac{3}{4} = \frac{2}{5} \times \frac{4}{3} = \frac{8}{15}$

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Math Physics Chemistry Biology QUESTION #7737

Question 2356

The corpus luteum is primarily formed from which structure after ovulation?

Graafian follicle✔️
Ovum
Oogonium
Oocyte

Correct Answer Logic:

After ovulation, the ruptured Graafian follicle collapses and transforms into the corpus luteum under LH influence. The ovum is released; oogonium and oocytes are germ cells.

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