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Sandstone is the most common and effective petroleum reservoir rock because it has high porosity (spaces between grains to store hydrocarbons) and high permeability (interconnected pores allowing fluid flow). Granite is crystalline with negligible primary porosity; shale has very low permeability (acts as a seal/source); and rock salt is impermeable and is used as a cap rock or creates diapir traps.

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Law QUESTION #9704

Question 4

Article 151 provides that the credit of a witness may be impeached by proof that the witness:

Is of low social status
Has been bribed or has accepted an offer of bribe or received corrupt inducement✔️
Has given inconsistent testimony in a different case not related to the instant proceedings
Has a criminal record unrelated to honesty

Correct Answer Logic:

Article 151(2) specifically provides that credit may be impeached by proof that the witness has been bribed, or has accepted the offer of a bribe, or has received any other corrupt inducement to give his evidence.

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Maths QUESTION #2841

Question 5

Find the Compound Interest on Rs. 5000 at $10\%$ per annum for 2 years (compounded annually).

Rs. 950
Rs. 1000
Rs. 1050✔️
Rs. 1100

Correct Answer Logic:

Amount $= P\left(1 + \dfrac{r}{100}\right)^n = 5000 \times \left(\dfrac{110}{100}\right)^2 = 5000 \times 1.21 = 6050$. CI $= 6050 - 5000 = Rs.\ 1050$.

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Maths QUESTION #4632

Question 6

Simplify: $\sqrt{48}$

$4\sqrt{3}$✔️
$6\sqrt{2}$
$2\sqrt{12}$
$12\sqrt{4}$

Correct Answer Logic:

$\sqrt{48} = \sqrt{16 \times 3} = 4\sqrt{3}$

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Agriculture Economics QUESTION #11888

Question 7

The price elasticity of supply is calculated as:

$E_s = \dfrac{\%\Delta P}{\%\Delta Q_s}$
$E_s = \dfrac{\%\Delta Q_s}{\%\Delta P}$✔️
$E_s = \%\Delta Q_s \times \%\Delta P$
$E_s = \dfrac{Q_s}{P}$

Correct Answer Logic:

Price elasticity of supply is the percentage change in quantity supplied divided by the percentage change in price: $E_s = \dfrac{\%\Delta Q_s}{\%\Delta P}$.

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Biology Zoology Botany QUESTION #10805

Question 8

Linking of Ca²⁺ with calmodulin activates which enzyme in the contraction cycle of smooth muscles?

MLC kinase✔️
MLC phosphorylase
MHC kinase
MHC phosphorylase

Correct Answer Logic:

In smooth muscle, Ca²⁺ binds calmodulin, forming the Ca²⁺-calmodulin complex that activates Myosin Light Chain (MLC) kinase. MLC kinase phosphorylates the regulatory light chains of myosin, enabling cross-bridge cycling and muscle contraction. This differs from skeletal muscle, where Ca²⁺ acts via troponin-tropomyosin on thin filaments. MLC phosphorylation is the key regulatory step in smooth muscle contraction.

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Biology Zoology Botany QUESTION #10787

Question 9

The uterine tubes terminate in a hollow muscular organ positioned in front of the rectum and behind the urinary bladder, which is called the:

Uterus✔️
Vagina
Cervix
Endometrium

Correct Answer Logic:

The uterus is the hollow, thick-walled muscular organ where implantation of the fertilised egg and foetal development occur. It is positioned in the pelvic cavity anterior to the rectum and posterior to the urinary bladder. The uterine (Fallopian) tubes open into its superior angles. The cervix is the lower, narrow portion of the uterus; the vagina is the birth canal; the endometrium is the inner lining of the uterus.

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Chemistry QUESTION #7150

Question 10

Identify the amphoteric hydroxide among the following group 2 elements.

$Be(OH)_{2}$✔️
$Ca(OH)_{2}$
$Mg(OH)_{2}$
$Sr(OH)_{2}$

Correct Answer Logic:

Most group 2 hydroxides are basic and their basicity increases down the group. However, Beryllium ($Be$) is the first element and shows diagonal relationship with Aluminum. Due to its small size and high electronegativity, $Be(OH)_{2}$ is amphoteric, meaning it reacts with both acids and strong bases.

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Reading and Writing (Module-1) QUESTION #10441

Question 11

The scheming coworker deceived his ------- and unsuspecting colleague, a particularly ------- man, into signing away his shares of the company.

cunning . . wary
naive . . trusting✔️
shrewd . . guarded
vigilant . . alert

Correct Answer Logic:

A colleague easily deceived is 'naive' and 'trusting.'

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Maths QUESTION #2893

Question 12

Complete the pattern: $1, 8, 27, 64, \dots$

100
125✔️
81
150

Correct Answer Logic:

The series represents cubes: $1^3, 2^3, 3^3, 4^3$. Next is $5^3 = 125$.

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General Knowledge QUESTION #4712

Question 13

The United Nations General Assembly typically holds its annual sessions beginning in which month?

January
March
September✔️
November

Correct Answer Logic:

The UN General Assembly's annual general debate begins each year in September, usually on the third Tuesday of the month.

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Planning QUESTION #4975

Question 14

Which Kevin Lynch element refers to paths that are not used but remain structurally significant?

Nodes
Edges✔️
Landmarks
Districts

Correct Answer Logic:

Edges are linear elements not used as paths by observers (shores, railroad cuts, walls) that form boundaries between districts or act as barriers, significantly structuring the mental image of a city.

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General Knowledge QUESTION #4724

Question 15

Biman is the national airline of which country?

Sri Lanka
Nepal
Bangladesh✔️
Myanmar

Correct Answer Logic:

Biman Bangladesh Airlines is the national flag carrier of Bangladesh, established in 1972 after the country's independence.

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Pakistan Affairs QUESTION #4677

Question 16

The AFPAK policy was announced by the Obama administration in which year?

2008
2009✔️
2007
2010

Correct Answer Logic:

The AFPAK (Afghanistan-Pakistan) policy was announced by President Barack Obama in March 2009. It combined the US strategies for Afghanistan and Pakistan into a single regional policy framework.

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Chemistry QUESTION #5548

Question 17

Arrange the ionic radii of $N^{3-}$, $O^{2-}$, and $F^-$ in correct increasing order (in Å):

1.36, 1.40 and 1.71 respectively
1.36, 1.71 and 1.40 respectively
1.71, 1.40 and 1.36 respectively✔️
1.71, 1.36 and 1.40 respectively

Correct Answer Logic:

All three ions are isoelectronic (10 electrons each). As nuclear charge increases ($N(7) < O(8) < F(9)$), the electrons are pulled closer, so ionic radius decreases. Therefore: $r(N^{3-}) > r(O^{2-}) > r(F^-)$, i.e., 1.71 Å > 1.40 Å > 1.36 Å.

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Math Physics Chemistry Biology QUESTION #525

Question 18

When carbon dioxide pressure increases the capacity of haemoglobin to hold oxygen:

Increases many folds
Decreases✔️
Remains constant
Is doubled

Correct Answer Logic:

Bohr effect: increased CO₂ decreases O₂ binding

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Statistics QUESTION #2009

Question 19

In the ANOVA table for an RCB design with $SS_{error} = 2.6249$ and error $df = 24$, the standard error for the difference between two treatment means $(\bar{y}_{i.} - \bar{y}_{j.})$ is:

$\sqrt{\dfrac{MS_E}{b}}$
$\sqrt{\dfrac{2 \cdot MS_E}{b}}$✔️
$\sqrt{MS_E}$
$\dfrac{MS_E}{b}$

Correct Answer Logic:

The standard error for comparing two treatment means in RCBD is $SE_{diff} = \sqrt{\dfrac{2 MS_E}{b}}$, where $b$ is the number of blocks (replications per treatment). Here $MS_E = 2.6249/24 = 0.1094$, so $SE_{diff} = \sqrt{2(0.1094)/9} \approx 0.1559$.

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Math Physics Chemistry Biology QUESTION #4312

Question 20

Which statement best explains the difference between humoral and cell-mediated immune response?

Humoral immunity involves B-Lymphocytes and cell-mediated immunity involves T-Lymphocytes✔️
Humoral immunity destroys viruses and cell-mediated immunity destroys bacteria
Humoral immunity is specific and cell-mediated immunity is nonspecific
Humoral immunity uses antibodies and cell-mediated immunity does not involve immune cells

Correct Answer Logic:

Humoral immunity involves B-lymphocytes producing antibodies against extracellular pathogens. Cell-mediated immunity involves T-lymphocytes targeting infected cells and intracellular pathogens.

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