Most Repeated GK MCQs from Past Papers MCQs with Answers & Explanations (Page 167)

A person climbing a hill leans forward in order to increase stability by shifting their center of gravity forward over their feet, reducing the chance of toppling backward.

An air bubble shines in water because of Total internal reflection at the bubble boundary, which reflects and redirects light to produce a bright appearance.

The eye's ability to see in the dark is due to the production of a purple pigment known as Retinene, which is formed in rod cells and enables low-light vision.

Syed Ali Shah Gilani was reported to have died at the age of 92, so 92 is the correct age at death.

The short film 'Out Swing' is the work for which Samar Minallah won the best short film award, so 'Out Swing' is correct.

The activity identified as a mental disorder is impaired control over gaming on mobile, reflecting that loss of control over gaming meets the disorder criteria.

A protein's three-dimensional structure is stabilized by multiple interactions - hydrogen bonds, ionic bonds, and disulfide bonds - so 'All of these' is correct.

Planetary motion is described by Kepler's laws (orbital shapes, area law, and period relationship), so 'Kepler law' is correct.

Nitrogen: Pyridine donates its lone pair on the ring nitrogen to metal centers, so it functions as a nitrogen donor ligand.

4: Four of the five d-orbitals (dxy, dyz, dxz, dx2−y2) have the characteristic cloverleaf shape, while the fifth (dz2) has a different form.

40: An average full-term pregnancy is about 40 weeks, which corresponds to roughly nine months of gestation.

Fission: Alpha particles can be produced during nuclear fission when a heavy nucleus splits and emits helium nuclei (alpha particles) among its products.

Copper: Copper is called a coinage metal because it was traditionally used to make coins and shares the characteristic properties of coinage metals.

DNA: Bacterial genetic information is stored in a single circular DNA chromosome located in the cell's nucleoid region.

Distillation separates miscible liquids by heating to vaporize the component with the lower boiling point and then condensing that vapor, so Distillation is the appropriate method.

Vitamin A is essential for good vision because it is a key component of the visual pigments in the retina that allow the eye to detect light.

Fatty acids and glycerol form triglycerides as glycerol bonds to three fatty acids, and the listed 'water and salt' refer to byproducts or associated components in their formation, so Fatty acids, Glycerol water and salt fits.

Glucose is the most common monosaccharide and serves as the basic building-block unit (monomer) of many carbohydrates, so Glucose is correct.

Dielectric describes materials that do not conduct electricity and can be polarized in an electric field, which is the defining property of insulating materials, so Dielectric fits.

A Polarimeter detects enantiomers by measuring the direction and magnitude of optical rotation that chiral molecules produce on plane-polarized light, so Polarimeter is used.