Most Repeated GK MCQs from Past Papers MCQs with Answers & Explanations (Page 166)

Major Muhammad Akram Shaheed: he is recognized as the first recipient of the Nishan i Haider.

nerve cells: Alzheimer's disease damages nerve cells (neurons), causing progressive loss of memory and cognitive function.

parasite: a parasite lives on or in a host and takes nutrients while causing harm to the host.

Magnetic pole: at the magnetic poles the field is vertical so the horizontal component of Earth's magnetic field is effectively zero.

Liquified HCl is a molecular (covalent) liquid with no free ions to carry charge, so it does not conduct electricity.

At the Magnetic Pole the Earth's magnetic field is essentially vertical, so the horizontal component of the field is zero there.

A Longitudinal wave has particles of the medium oscillating back and forth in the same direction as the wave travels, which fits the description.

Radio waves are Electromagnatic waves because they propagate as oscillating electric and magnetic fields through space.

Increase Stability: leaning forward shifts the climber's center of gravity over the feet and lowers it, which increases stability on a slope.

Odontology is the term for the systematic scientific study of teeth, so it matches the definition.

The defining numeric value for a nautical mile is 1852, so the option listed as "1852 kilometers" fits by giving that standard figure.

Milk. A lactometer measures the density/specific gravity of milk to assess its purity and detect dilution with water.

Decrease. During a solar eclipse light intensity falls sharply, so the light-driven reactions of photosynthesis slow and overall photosynthesis rate decreases.

Gram Positive. Penicillin blocks peptidoglycan synthesis and Gram-positive bacteria have a thick, exposed peptidoglycan layer, making them more susceptible.

Foal. A young horse is called a foal until it grows older and reaches weaning or maturity.

Sun Rays. Helium was first detected as a spectral line in sunlight, observed in the solar spectrum (sun rays).

Light-emitting diodes are made from compounds of Gallium because gallium-based semiconductors have electronic properties that allow efficient light emission when charge carriers recombine.

Ball bearings reduce friction by reducing the area of the contact with the use of metallic balls, converting sliding contact into rolling contact and so greatly lowering resistance.

Copper wires are used because Copper is a better conductor than iron, giving lower electrical resistance and less energy loss during power transmission.

In a refrigerator cooling is produced by the evaporation of a volatile liquid, since the refrigerant absorbs heat from the interior as it vaporizes.