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Agronomy QUESTION #2051

Conservation agriculture (CA) is based on three core principles. Which combination correctly identifies all three?

Deep plowing + high input use + crop rotation
Minimum soil disturbance (no/minimum tillage) + permanent soil cover (mulch/crop residues) + crop species diversification (rotation/intercropping)✔️
Organic farming + biological pest control + rainwater harvesting
Precision irrigation + slow-release fertilizers + integrated pest management

Correct Answer Logic:

FAO defines Conservation Agriculture by three linked principles: (1) minimum mechanical soil disturbance, (2) permanent organic soil cover with crop residues or cover crops, and (3) species diversification through crop rotations and/or intercropping. All three must be practiced simultaneously for CA to deliver its full benefits.

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Math Physics Chemistry Biology QUESTION #7759

Question 5622

Enzymes accelerate chemical reactions by:

Changing equilibrium toward substrate
Increasing activation energy
Increasing substrate concentration
Lowering activation energy✔️

Correct Answer Logic:

Enzymes lower the activation energy (Eₐ) of a reaction, allowing more molecules to reach the transition state at a given temperature. They do not alter equilibrium.

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English QUESTION #8495

Question 5623

Select the word SIMILAR in meaning to: SONOROUS

Reassuring
Resonant✔️
Repetitive
Sisterly

Correct Answer Logic:

Sonorous means producing a deep, full sound; resonant.

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Accounting & Finance QUESTION #6193

Question 5624

If a firm's 'Inventory Turnover' is $5$ times, what is the 'Days' Sales in Inventory'?

73 days.✔️
50 days.
365 days.
90 days.

Correct Answer Logic:

$365 / 5 = 73$ days [cite: 39].

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General Abilities QUESTION #7982

Question 5625

If $(7^a)(7^b) = \dfrac{7^c}{7^d}$, what is $d$ in terms of $a$, $b$ and $c$?

$\dfrac{c}{ab}$
$c - a - b$✔️
a + b - c
c - ab

Correct Answer Logic:

$7^a \times 7^b = \dfrac{7^c}{7^d}$
$7^{a+b} = 7^{c-d}$
$a + b = c - d$
$d = c - a - b$

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Math Physics Chemistry Biology QUESTION #4206

Question 5626

Components of reflex arc must contain neurons from:

Motor nerve and Mixed nerve
Sensory nerve and intermediate nerve
Motor nerve and Sensory Nerve✔️
Mixed nerve and intermediate nerve

Correct Answer Logic:

A reflex arc requires sensory neurons (afferent) and motor neurons (efferent).

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General Knowledge QUESTION #9006

Question 5627

The ability to know the thoughts of others without communication is called:

Telepathy✔️
Psychology
Telecommunication
Psychiatry

Correct Answer Logic:

Telepathy is the supposed ability to read minds.

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CISA QUESTION #1770

Question 5628

Who holds the primary responsibility for defining the scope of an audit?

Auditor
Client✔️
Audit manager
Auditee

Correct Answer Logic:

Every audit is commissioned and funded by a client, who bears responsibility for setting the scope, granting the necessary authority, and providing access to the auditee. The auditor then designs the audit plan in accordance with the client-defined scope and applicable audit standards.

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Physics QUESTION #7028

Question 5629

A force acts on an object of mass $2\text{ kg}$ such that its position as a function of time is $x = 3t^2 + 5$. Calculate the work performed by this force during the first $5$ seconds of motion.

$850\text{ J}$
$950\text{ J}$
$875\text{ J}$
$900\text{ J}$✔️

Correct Answer Logic:

Work done is equal to the change in kinetic energy ($\Delta KE$). First, find velocity $v = \frac{dx}{dt} = 6t$. At $t=0$, $v_i = 0$. At $t=5$, $v_f = 6(5) = 30\text{ m/s}$. $\Delta KE = \frac{1}{2}m(v_f^2 - v_i^2) = \frac{1}{2}(2)(30^2 - 0) = 900\text{ J}$.

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General Abilities QUESTION #2824

Question 5630

Solve for $x$: $3x - 7 = 2x + 5$

10
12✔️
14
15

Correct Answer Logic:

$3x - 7 = 2x + 5$. Subtract $2x$ from both sides: $x - 7 = 5$. Add 7: $x = 12$.

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Accounting & Finance QUESTION #1202

Question 5631

Which financial statement is unique to public sector accounting?

Statement of Financial Performance
Statement of Cash Flows
Appropriation Account✔️
Statement of Changes in Equity

Correct Answer Logic:

The Appropriation Account is unique to public sector (government) accounting. It shows how the government's budget has been allocated and spent across various ministries and departments. It accounts for voted grants and actual expenditures, showing the utilization of appropriated funds.

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Pakistan Affairs QUESTION #585

Question 5632

Jinnah Papers' were published by:

Z. A. Suleri
Zawwar Hussain Zaidi✔️
Jamil ud Din Ahmad
None of These

Correct Answer Logic:

Dr. Zawwar Hussain Zaidi was the editor-in-chief of the Jinnah Papers project.

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Physics QUESTION #1171

Question 5633

The product of mass and velocity is known as:

Work
Moment
Impulse
Momentum✔️

Correct Answer Logic:

Momentum is defined as the product of mass and velocity: $\vec{p} = m\vec{v}$. It is a vector quantity measured in $\text{kg·m/s}$. Work is force times displacement, impulse is force times time (equal to change in momentum), and moment refers to torque.

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English QUESTION #8385

Question 5634

De Jure means:

by right
by law✔️
by the way
by itself

Correct Answer Logic:

De Jure means by law (legally).

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Boilers Mechanical Engineering QUESTION #4016

Question 5635

'Refractory' material in a boiler furnace is used to:

Generate electricity
Withstand and reflect high temperatures while protecting the metal shell✔️
Act as a lubricant
Increase the weight of the boiler

Correct Answer Logic:

Firebricks and castables are used to line the furnace area.

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Islamic Studies QUESTION #336

Question 5636

The name of Hazrat Zaid bin Haritha (RA) is mentioned in which Surah?

Al-Saff
Al-Ahzab✔️
Bani Israel
Yaseen

Correct Answer Logic:

He is the only Companion of the Prophet (ﷺ) mentioned by name in the Quran (Surah Al-Ahzab, Verse 37).

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Planning QUESTION #4987

Question 5637

What is the recommended ratio of open space to built-up area in Clarence Perry's Neighborhood Unit?

1:1
1:2
1:3✔️
1:4

Correct Answer Logic:

Perry's Neighborhood Unit concept (1929) recommended approximately one-third of total area for parks, playgrounds, and open spaces, creating a 1:2 ratio with built-up area, ensuring adequate recreational facilities within walking distance (quarter-mile radius).

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Mathematics QUESTION #4168

Question 5638

The exact value of $\int_1^3 \frac{1}{x^2} dx$ is:

$\frac{1}{3}$
$\frac{2}{3}$✔️
$\frac{1}{2}$
$1$

Correct Answer Logic:

$\int_1^3 x^{-2} dx = \left[-\frac{1}{x}\right]_1^3 = -\frac{1}{3} + 1 = \frac{2}{3}$.

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Biology QUESTION #7243

Question 5639

Two microbes found to be very useful in genetic engineering are:

Diplococcus sp. and Pseudomonas sp.
Crown gall bacterium and Caenorhabditis elegans
Escherichia coli and Agrobacterium tumefaciens✔️
Vibrio cholerae and a tailed bacteriophage

Correct Answer Logic:

E. coli is the workhorse of genetic engineering — used for cloning, protein expression, and plasmid propagation. Agrobacterium tumefaciens is used to introduce foreign genes into plant cells via its Ti plasmid. Together they are the most commonly used microbes in genetic engineering.

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Physics QUESTION #7073

Question 5640

Radioactive substance $A$ has a half-life $T$ and transforms into substance $B$. At $t = 0$, the sample contains only $A$. At a specific time $t$, the ratio of the quantity of $B$ to $A$ is found to be $0.3$. Which of the following expressions correctly defines $t$ in terms of $T$?

$t = \frac{T}{\log(1.3)}$
$t = \frac{T}{2} \frac{\log 2}{\log 1.3}$
$t = T \frac{\log 1.3}{\log 2}$✔️
$t = T \log(1.3)$

Correct Answer Logic:

Let $N_A$ be the remaining nuclei of $A$ and $N_B$ be the produced nuclei of $B$. $N_B/N_A = 0.3 \implies (N_0 - N_A)/N_A = 0.3$. This gives $N_0/N_A = 1.3$, or $N_A = N_0/1.3$. Using the decay law $N = N_0 2^{-t/T}$, we get $1/1.3 = 2^{-t/T}$. Taking logs: $\log(1.3) = (t/T)\log 2$. Solving for $t$ gives $t = T \frac{\log 1.3}{\log 2}$.

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