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Chemistry QUESTION #7165

Arrange the following electrolytes in increasing order of their coagulating power for an arsenious sulphide ($As_{2}S_{3}$) sol: $Na^{+}$, $Al^{3+}$, and $Ba^{2+}$.

$Al^{3+} < Ba^{2+} < Na^{+}$
$Na^{+} < Ba^{2+} < Al^{3+}$✔️
$Ba^{2+} < Na^{+} < Al^{3+}$
$Al^{3+} < Na^{+} < Ba^{2+}$

Correct Answer Logic:

According to the Hardy-Schulze Rule, the coagulating power of an ion is directly proportional to the magnitude of its charge. Since $As_{2}S_{3}$ is a negatively charged sol, the order for cations is:

$Na^{+}$ (Charge: +1)
$Ba^{2+}$ (Charge: +2)
$Al^{3+}$ (Charge: +3)

Thus, $Na^{+} < Ba^{2+} < Al^{3+}$.

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Disaster Management QUESTION #6545

Question 2

Which monitoring and evaluation approach would most effectively support adaptive management of the DRR strategy?

Annual budget reviews
Real-time data tracking with digital dashboards, regular stakeholder feedback, and scenario-based learning to inform mid-course corrections✔️
Final evaluation after five years
Compliance checklists

Correct Answer Logic:

Section 13.7 emphasizes real-time monitoring through digital dashboards, periodic workshops for knowledge sharing, and using findings for adaptive management. Effective MEL supports continuous learning and course correction rather than just accountability.

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Agriculture Economics QUESTION #11890

Question 3

If the price elasticity of demand is calculated as $E_d = -2.5$, demand for that good is described as:

Perfectly inelastic
Inelastic
Elastic✔️
Unit elastic

Correct Answer Logic:

An elasticity coefficient with $|E_d| > 1$ (here, $2.5$) indicates elastic demand.

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Social Studies QUESTION #10032

Question 4

Black feminism is distinguished from mainstream feminism primarily by its focus on:

Injustices affecting the daily lives of Black women
A long-standing emphasis on intersectionality
The cumulative effects of multiple forms of discrimination
All of these✔️

Correct Answer Logic:

Black feminism centers Black women's lived experience, intersectionality, and compounded/multiple discrimination.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3113

Question 5

The majority of nutrient absorption takes place in the:

Stomach
Small Intestine✔️
Large Intestine
Esophagus

Correct Answer Logic:

The small intestine (especially the jejunum) is the primary site of absorption due to its large surface area.

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Security Measures to Maintain Law and Order QUESTION #905

Question 6

To prevent "Sabotage" (Section 6), the ASF must maintain order in the "Cargo Area" through:

Bill of Lading checks
Sealed ULD inspections
Access control & X-ray✔️
Weight verification

Correct Answer Logic:

Maintaining order in cargo involves ensuring no unauthorized persons enter and all goods are screened for explosives.

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Accounting & Finance QUESTION #9627

Question 7

Which of the following expenditures would be classified as CAPITAL expenditure rather than revenue expenditure?

Monthly electricity bill for the factory
Legal charges incurred in acquiring a new building✔️
Repairs that restore an asset to its original working condition
Annual insurance premium on factory machinery

Correct Answer Logic:

Capital expenditure is incurred to acquire or improve an asset, providing benefit over more than one accounting period. Legal charges incurred to acquire an asset are capitalized as part of the cost of that asset (the building). Monthly electricity, repairs restoring original condition, and insurance premiums are revenue expenses because their benefit is consumed within one accounting period.

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Psychology QUESTION #9916

Question 8

Which of the following correctly represents the order of Maslow's hierarchy of needs?

Safety, physiological, self-actualization, esteem
Belongingness, esteem, physiological, safety, self-actualization
Physiological, belongingness, safety, esteem, self-actualization
Physiological, safety, belongingness, esteem, self-actualization✔️

Correct Answer Logic:

Maslow's hierarchy from base to apex: (1) Physiological, (2) Safety, (3) Belongingness/Love, (4) Esteem, (5) Self-actualization. Lower needs must be substantially met before higher needs become primary motivators.

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Math Physics Chemistry Biology QUESTION #11311

Question 9

Which of the following is a backcross?

AA x aa
Aa x AA
Aa x aa✔️
AA x Aa

Correct Answer Logic:

A backcross involves crossing a heterozygous individual (Aa) with a homozygous recessive individual (aa).

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Mathematics QUESTION #978

Question 10

Let $\alpha_\theta$ and $\beta_\theta$ be the distinct roots of $2x^2+(\cos\theta)x-1=0,\ \theta\in(0,2\pi)$. If $m$ and $M$ are the minimum and maximum values of $\alpha_\theta^4+\beta_\theta^4$, then $16(M+m)$ equals:

24
25✔️
17
27

Correct Answer Logic:

By Vieta's: $\alpha+\beta=-\frac{\cos\theta}{2}$, $\alpha\beta=-\frac{1}{2}$. Then $\alpha^2+\beta^2=(\alpha+\beta)^2-2\alpha\beta=\frac{\cos^2\theta}{4}+1$. And $\alpha^4+\beta^4=(\alpha^2+\beta^2)^2-2(\alpha\beta)^2=\left(\frac{\cos^2\theta}{4}+1\right)^2-\frac{1}{2}$. Let $u=\cos^2\theta\in[0,1]$. Max at $u=1$: $M=\frac{25}{16}-\frac{1}{2}=\frac{17}{16}$. Min at $u=0$: $m=1-\frac{1}{2}=\frac{1}{2}$. So $16(M+m)=16\cdot\frac{25}{16}=25$.

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Mathematics QUESTION #6019

Question 11

Let $S$ be the set of distinct values of $b$ for which the linear system $x+y+z=1$, $x+ay+z=1$, $ax+by+z=0$ has no solution. Describe the set $S$.

An empty set
An infinite set
A finite set with two or more elements
A singleton✔️

Correct Answer Logic:

Subtract equation 1 from equation 2: $(a-1)y = 0$.

Case $a\neq1$: $y=0$. Then from eq.1 and eq.3: $x+z=1$ and $ax+z=0$, giving $(a-1)x=-1$, so $x=\frac{-1}{a-1}$. This always has a solution for $a\neq1$.

Case $a=1$: System becomes $x+y+z=1$, $x+y+z=1$, $x+by+z=0$. The third equation forces $-1=by-... $ i.e. subtracting eq.1: $(b-1)y=-1$. For no solution we need $b=1$.

So $S=\{1\}$ — a single value. Hence $S$ is a singleton.

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Information Technology QUESTION #1119

Question 12

What is meant by refactoring code in SDLC?

To modify the functionality of software
To improve the code quality✔️
To find out bugs in a software
None of these

Correct Answer Logic:

Code refactoring is the process of restructuring existing computer code—changing the factoring—without changing its external behavior to improve non-functional attributes.

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Mathematics QUESTION #11132

Question 13

The period of the function $A\cos\omega t + B\sin\omega t$ is:

$\dfrac{\omega}{2\pi}$
$2\pi\omega$
$\dfrac{\omega}{2\pi}$
$\dfrac{2\pi}{\omega}$✔️

Correct Answer Logic:

The functions $\cos\omega t$ and $\sin\omega t$ each have period $\dfrac{2\pi}{\omega}$. Therefore their linear combination $A\cos\omega t + B\sin\omega t$ also has period $\dfrac{2\pi}{\omega}$. This can be written as $R\cos(\omega t - \phi)$ where $R = \sqrt{A^2+B^2}$ and $\tan\phi = B/A$, confirming the period is $\dfrac{2\pi}{\omega}$.

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Psychology QUESTION #9785

Question 14

According to Piaget, the stage between 2 and 7 years in which language develops slowly and gradually is called the:

Preoperational stage✔️
Egocentric thought
Sensorimotor stage
None of these

Correct Answer Logic:

Piaget's preoperational stage (ages 2–7) sees emergence of language and symbolic thinking. Children remain egocentric and lack logical operations but progressively develop language abilities.

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Physics QUESTION #1034

Question 15

A microscope has objective focal length 2 cm, eyepiece focal length 4 cm, tube length 40 cm, and least distance of distinct vision 25 cm. The magnification is:

150✔️
250
100
125

Correct Answer Logic:

Magnification $= \frac{L}{f_o}\times\frac{D}{f_e} = \frac{40}{2}\times\frac{25}{4} = 20\times6.25 = 125$. Wait: $20\times6.25=125$... but option (1) is 150. Using: $m = \frac{L}{f_o}\left(1+\frac{D}{f_e}\right) = 20\times(1+6.25)=20\times7.25=145\approx150$. So option (1) = 150.

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Academic/Professional (Social Sciences) QUESTION #6495

Question 16

Which concept refers to the movement of individuals or groups between different social positions?

Social Integration
Social Mobility✔️
Social Control
Social Solidarity

Correct Answer Logic:

Social mobility can be upward, downward, or horizontal within a social hierarchy.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3400

Question 17

'Pernicious Anemia' is caused by the deficiency of which vitamin?

Vitamin B1 (Thiamine)
Vitamin B6 (Pyridoxine)
Vitamin B12 (Cyanocobalamin)✔️
Folic Acid

Correct Answer Logic:

Often due to a lack of intrinsic factor needed for B12 absorption.

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General Knowledge QUESTION #8944

Question 18

A chronometer is an instrument used for measuring:

Temperature
Electric current
Velocity
Longitude (time accurately)✔️

Correct Answer Logic:

A marine chronometer is used for navigation and determining longitude.

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English QUESTION #8515

Question 19

The opposite of 'amateur' is:

Mature
Professional✔️
Unskilled
Trained

Correct Answer Logic:

Amateur is non-professional; opposite is professional.

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Dairy Food Science and Technology QUESTION #5899

Question 20

During spray drying of milk, if outlet temperature is too HIGH, the primary consequence is:

Product moisture content will be too high causing caking
Product will be over-dried causing scorching/browning and loss of heat-sensitive nutrients✔️
Fat will separate and coat the powder particles
Powder will not reconstitute properly in water

Correct Answer Logic:

High outlet temperature in a spray dryer results in over-drying: excessive moisture loss below target ($3\text{–}4\%$), scorching of powder particles on chamber walls, Maillard browning, loss of lysine and heat-sensitive vitamins, and poor solubility of reconstituted powder.

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