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Boilers Mechanical Engineering QUESTION #2406

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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Mathematics QUESTION #6929

Question 3122

Let $I=\displaystyle\int_a^b(x^4-2x^2)\,dx$. Find the ordered pair $(a,b)$ that minimises $I$.

$(0,\sqrt{2})$
$(-\sqrt{2},0)$
$(\sqrt{2},-\sqrt{2})$
$(-\sqrt{2},\sqrt{2})$✔️

Correct Answer Logic:

$x^4-2x^2=x^2(x^2-2)\leq0$ when $|x|\leq\sqrt{2}$ and $\geq0$ outside.

To minimise the integral (make it most negative), integrate over the region where the integrand is most negative — i.e., $[-\sqrt{2},\sqrt{2}]$ where the function is $\leq0$.

Any sub-interval of $[-\sqrt{2},\sqrt{2}]$ gives a more negative (or equal) value, and the widest such interval $[-\sqrt{2},\sqrt{2}]$ gives the minimum.

$(a,b)=(-\sqrt{2},\sqrt{2})$

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The Constitution of Pakistan QUESTION #9387

Question 3123

A constitutional amendment Bill under Article 239(1) must be passed in each House by what threshold?

Simple majority of present and voting
Absolute majority of total membership
Not less than two-thirds of total membership✔️
Three-fourths of total membership

Correct Answer Logic:

Article 239(1) requires the amendment Bill to be 'passed by the votes of not less than two-thirds of the total membership of the House' — a supermajority calculated on total seats, not merely those present and voting. This is a stricter threshold than ordinary legislation.

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Chemistry QUESTION #431

Question 3124

__________ is used as catalyst in Haber's process for NH? gas manufacture.

Iron✔️
Carbon
Copper
Silver

Correct Answer Logic:

Iron is the catalyst in Haber process

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Academic/Professional (Social Sciences) QUESTION #6511

Question 3125

The term 'Global Village' was coined by:

Anthony Giddens
Marshall McLuhan✔️
Immanuel Wallerstein
Manual Castells

Correct Answer Logic:

McLuhan used this to describe how electronic media collapses time and space.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3595

Question 3126

'Digitalis purpurea' (Foxglove) contains glycosides used as:

Laxatives
Cardiotonics (Heart stimulants)✔️
Sedatives
Antiseptics

Correct Answer Logic:

Digitalis increases the force of heart contraction in heart failure.

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Biology QUESTION #7282

Question 3127

Single-celled eukaryotes are included in:

Monera
Protista✔️
Fungi
Archaea

Correct Answer Logic:

Protista (Kingdom Protista) includes all unicellular eukaryotes such as Amoeba, Paramecium, Euglena, diatoms, and slime moulds. Monera and Archaea are prokaryotes (no true nucleus). Most Fungi are multicellular (except unicellular yeasts), and they belong to Kingdom Fungi, not Protista.

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General Knowledge QUESTION #2613

Question 3128

What is the PRIMARY function of a CPU (Central Processing Unit)?

To store large amounts of data permanently like photos and documents
To convert electricity from the wall outlet into usable computer power
To process instructions and perform calculations that run programs and applications✔️
To connect peripheral devices like keyboards and mice to the computer

Correct Answer Logic:

The CPU (Central Processing Unit) is the brain of the computer. It processes instructions and performs calculations. Every action you take on a computer — opening a file, typing text — involves the CPU executing instructions.

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Math Physics Chemistry Biology QUESTION #7745

Question 3129

The genetic information inherited from your parents for a specific trait like hair color is called your:

Genotype✔️
Karyotype
Phenotype
None

Correct Answer Logic:

Genotype refers to the actual alleles present (e.g., BB, Bb, bb). Phenotype is the physical expression. Karyotype is the chromosome set.

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Dairy Food Science and Technology QUESTION #5897

Question 3130

In CIP (Cleaning-In-Place) of dairy equipment, the correct sequence of steps is:

Hot water rinse $\rightarrow$ caustic wash $\rightarrow$ acid wash $\rightarrow$ sanitizer $\rightarrow$ final rinse
Pre-rinse (warm water $35\text{–}40^{\circ}\text{C}$) $\rightarrow$ caustic wash (NaOH $1\text{–}2\%$, $70\text{–}80^{\circ}\text{C}$) $\rightarrow$ intermediate rinse $\rightarrow$ acid wash $\rightarrow$ final rinse $\rightarrow$ sanitizer✔️
Acid wash $\rightarrow$ caustic wash $\rightarrow$ pre-rinse $\rightarrow$ sanitizer
Sanitizer $\rightarrow$ caustic wash $\rightarrow$ acid wash $\rightarrow$ water rinse

Correct Answer Logic:

Standard CIP sequence: (1) Pre-rinse with warm water ($35\text{–}40^{\circ}\text{C}$); (2) Alkaline wash (NaOH $1\text{–}2\%$ at $70\text{–}80^{\circ}\text{C}$) to remove proteins and fats; (3) Intermediate water rinse; (4) Acid wash ($\text{HNO}_3$ or $\text{H}_3\text{PO}_4$ $0.5\text{–}1\%$) to remove milkstone; (5) Final water rinse; (6) Sanitizer before use.

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Math Physics Chemistry Biology QUESTION #7776

Question 3131

The ester formed from a fatty acid and a long-chain alcohol is called:

Acylglycerol
Glycerol
Phospholipid
Wax✔️

Correct Answer Logic:

Waxes are esters of long-chain fatty acids with long-chain alcohols. Acylglycerols (fats/oils) are esters with glycerol. Phospholipids have a phosphate group.

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ETAG General Aptitude QUESTION #3765

Question 3132

Consider a cube where each of the eight vertices must be colored. The rule is that any two vertices connected by an edge must have different colors. What is the minimum number of colors required?

8
4
3
2✔️

Correct Answer Logic:

A cube is a bipartite graph, and any bipartite graph can be colored using a minimum of 2 colors.

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General Knowledge QUESTION #8989

Question 3133

The Baghachur area of Dera Ghazi Khan contains mineral reserves of:

Rock Phosphate
Limestone
Chromites
Uranium✔️

Correct Answer Logic:

Baghachur has uranium reserves.

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Verbal Reasoning QUESTION #8102

Question 3134

$t$ is a positive integer and $\dfrac{4}{7} = \dfrac{t}{s}$.

Compare:

Column A: $s$

Column B: $7$

Column A is greater
Column B is greater
The two quantities are equal
The relationship cannot be determined from the information given✔️

Correct Answer Logic:

From $\dfrac{4}{7} = \dfrac{t}{s}$, we get $s = \dfrac{7t}{4}$.

Since $t$ is a positive integer, different values of $t$ yield different results:

If $t = 4$: $s = 7$ → Column A $=$ Column B (equal)
If $t = 8$: $s = 14 > 7$ → Column A is greater
If $t = 2$: $s = 3.5 < 7$ → Column B is greater

Since the result changes depending on $t$, the relationship cannot be determined from the information given.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3079

Question 3135

'Homeostasis' is best defined as:

The breakdown of nutrients
The maintenance of a stable internal environment✔️
The process of cell division
The movement of blood through vessels

Correct Answer Logic:

Homeostasis ensures that physiological variables like temperature and pH stay within narrow limits.

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Boilers Mechanical Engineering QUESTION #4007

Question 3136

'Stoichiometric Air' is defined as:

The maximum air a fan can blow
The theoretical amount of air required for complete combustion of fuel✔️
Air containing only nitrogen
Air used for cooling the boiler room

Correct Answer Logic:

Providing too little air causes $CO$ formation (waste); too much air carries heat out the chimney.

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Chemistry QUESTION #5561

Question 3137

Which of the following statements about low-density polythene (LDPE) is FALSE?

It is a poor conductor of electricity.
Its synthesis requires dioxygen or a peroxide as an initiator.
It is used to make buckets, dustbins, etc.✔️
Its synthesis requires high pressure.

Correct Answer Logic:

LDPE is made by free-radical polymerization of ethylene at high temperature (~350°C) and high pressure (~1000–2000 atm) using oxygen or a peroxide initiator. It is a poor conductor of electricity (true). LDPE is used for packaging films, bags, and squeeze bottles. Buckets and dustbins are made from HIGH-density polythene (HDPE), NOT LDPE. So option C is FALSE.

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Psychology QUESTION #9840

Question 3138

Which of the following is NOT a measure of retention?

Recognition
Recall
Relearning
Reminiscence✔️

Correct Answer Logic:

Standard measures of retention: recognition (identifying learned items), recall (reproducing them), relearning (savings in re-acquisition). Reminiscence — spontaneous improvement after rest — is a phenomenon, not a measurement method.

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General Knowledge QUESTION #95

Question 3139

Three adults—R, S, and V—will be traveling in a van with five children—F, H, J, L, and M. The van has a driver's seat and one passenger seat in the front, and two benches behind the front seats, one bench behind the first. Each bench has room for exactly three people. Everyone must sit in a seat or on a bench, and seating is subject to the following restrictions: An adult must sit on each bench. Either R or S must sit in the driver's seat. J must sit immediately beside M.

Sub-Questions:

Question 1

Which of the following can sit in the front passenger seat?

J
L✔️
R
S

Question 2

Which of the following groups of three can sit together on a bench?

F, J, and M
F, J, and V
F, S, and V
H, L, and S✔️

Question 3

If F sits immediately beside V, which of the following CANNOT be true?

H sits on the same bench as R.✔️
F sits on the same bench as H.
H sits in the front passenger seat
L sits immediately beside V.

Question 4

If S sits on a bench that is behind where J is sitting, which of the following must be true?

H sits in a seat or on a bench that is in front of where M is sitting.
M sits on the same bench as V.✔️
L sits in a seat or on a bench that is in front of where F is sitting.
L sits on the same bench as S

Correct Answer Logic:

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Pakistan Affairs QUESTION #4665

Question 3140

The Durand Line forms the border between Pakistan and which neighboring country?

Iran
Afghanistan✔️
India
China

Correct Answer Logic:

The Durand Line is the 2,430-kilometer international border between Afghanistan and Pakistan, established in 1893 by the Durand Agreement between British India and Afghanistan.

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