KMU CAT 2024 original Test 1

“News” is an uncountable noun, so “some news” is grammatically correct. “A new” (a) and “a news” (b) are incorrect (news cannot be singular). “Some new” (c) is incomplete.

Tension (a), speed (b), and centripetal force (c) vary with position in vertical circular motion. Only Earth’s gravitational pull (weight = mg) remains constant (assuming negligible altitude change).

V = √(γ). γ for neon = 1.33. γ for water = 1.8. v_neon/v_water = √(γ_neon/γ_water) = √(1.33/1.8) ≈ 1. (Note: Check values, but ratio approaches 1).

Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum, a spirochete. Candida albicans (b) causes fungal infections, Neisseria gonorrhoeae (c) causes gonorrhea, and HIV (d) is a virus causing AIDS.

Leydig cells (interstitial cells) secrete testosterone in response to LH. Sertoli cells (a) support spermatogenesis. Spermatogonia (c) are germ cells (precursors to sperm).

For n = 4, the maximum electrons = 2n² = 2(4)² = 32. However, if considering all orbitals (including f), but standard n=4 gives 32. (Possible typo in options; correct answer is 32 (a), but if n=5, then 2(5)²=50, not 60.)

Horizontal movement: No work is done against gravity (force is perpendicular to displacement). Vertical climb: Work W = F × d = 50N × 5m = 250 J. Total work done = 250 J (only vertical work counts).

BF₃ has a trigonal planar shape with symmetrical charge distribution, resulting in a net dipole moment of zero. NH₃ (a) and NF₃ (c) are pyramidal with a net dipole. H₂O (d) is bent and has a strong dipole moment.

T-cells migrate from bone marrow to the thymus for maturation (positive/negative selection). B-cells (humoral immunity) mature in the bone marrow.

Anthracene (C₁₄H₁₀) and phenanthrene (C₁₄H₁₀) are structural isomers (same molecular formula, different arrangement). Benzene (C₆H₆), naphthalene (C₁₀H₈), and chrysene (C₁₈H₁₂) have different molecular formulas.

The SA node (located in the right atrium) is the natural pacemaker, initiating electrical impulses (~60–100 bpm). The AV node (b) relays signals to ventricles but doesn’t originate them.

In a monohybrid cross (Aa × Aa), the genotypic ratio is 1 AA : 2 Aa : 1 aa. Since both AA and Aa exhibit the dominant phenotype, the phenotypic ratio is 3 dominant : 1 recessive, meaning 75% (¾) will show the dominant trait.

IR rays, X-rays, and γ-rays are all part of the electromagnetic spectrum. Anodic rays (or canal rays) are positively charged ions (not electromagnetic waves) produced in gas discharge tubes.

Sigma (σ) bond forms by head-on (end-to-end) overlapping of orbitals (e.g., s-s, s-p, p-p). Pi (π) bond (b) forms by sideways overlapping of p-orbitals. Metallic (c) and coordinate covalent (d) bonds are different types.

The intrinsic factor (secreted by gastric parietal cells) binds to vitamin B₁₂ in the small intestine, enabling its absorption. Deficiencies cause pernicious anemia. Vitamins A (a) and K (c) are absorbed via other mechanisms.

A catalyst lowers the activation energy for both forward and reverse reactions equally, thus increasing their rates proportionally. It does not alter the equilibrium position, only helps achieve it faster.

Ionic character depends on electronegativity difference between bonded atoms. F (fluorine) is the most electronegative, so H–F has the highest ionic character among the given options. Order: HF > HCl > HBr > HI (decreasing ionic character).

Obelia (a cnidarian) exhibits metagenesis—alternation between asexual polyp and sexual medusa stages. Other terms: (a) Budding: Asexual reproduction (part of the cycle but incomplete). (b) Gemmules: Reproductive structures in sponges. (d) Metamorphosis: Transformation (e.g., tadpole to frog).

Inalienable means absolute or cannot be taken away (synonymous with “inherent”). Other options: (a) First and foremost: Highest priority. (b) Primary: Basic or elementary. (d) Precious: Valuable but not unremovable.

Reactivity order: Acyl chloride (most reactive) > Anhydride > Ester > Amide (least reactive). Nucleophilic acyl substitution is fastest with acyl chlorides due to good leaving group (Cl⁻).

+1: In most compounds (e.g., H₂O). -1: In metal hydrides (e.g., NaH). 0: In H₂ (elemental form).

Electron geometry: Trigonal bipyramidal (5 regions). Molecular shape: Seesaw (1 lone pair + 4 bonds). If the question is about CH₄ (tetrahedral), the answer would be (d) Tetrahedral. Clarification needed on the exact molecule.

The hour hand completes 1 full rotation (2π radians) in 12 hours. Angular velocity (ω) = Total angle / Time = 2π rad / 12 h ≈ 0.52 rad/h.

Adrenaline (epinephrine) is degraded by: MAO (mitochondrial enzyme) and COMT (catechol-O-methyltransferase, extracellular). Cholinesterase (a) breaks down acetylcholine (not adrenaline). Adrenalinease (b) doesn’t exist.

Malpighian tubules (in insects and arthropods) excrete uric acid, a semi-solid waste to conserve water. Other excretory products: (a) Urine: Produced by kidneys (vertebrates). (b) Ammonia: Toxic, excreted by aquatic organisms. (d) Urea: Mammals excrete this less toxic form.

r = mv/qB. rα/rD = (mα/qα)/(mD/qD) = (4/2)/(2/1) = 2/1.

Maximum velocity (vₘₐₓ) = Aω. Maximum acceleration (aₘₐₓ) = Aω². Divide: aₘₐₓ/vₘₐₓ = ω → ω = 12/6 = 2 rad/s. Substitute back: 6 = A × 2 → A = 3 m.

Frequency of a vibrating string is given by: f = 1/2L √(T/m).

The second-order rate constant (k) has units of concentration⁻¹ time⁻¹. cm³ mol⁻¹ sec⁻¹ (a), dm³ mol⁻¹ sec⁻¹ (b), and M⁻¹ sec⁻¹ (c) are all valid units (just different volume units). M³ M⁻¹ sec⁻¹ (c) seems incorrect (likely a typo; should be M⁻¹ sec⁻¹).

During muscle contraction (sliding filament theory): (a) H-zone disappears (thin filaments overlap thick filaments). (b) I-band shortens (thin filaments slide inward). (c) Z-lines come closer together (sarcomere shortens). (d) A-band remains constant (length of thick filaments doesn’t change).

The sun’s energy is produced by nuclear fusion (hydrogen nuclei combining to form helium). Nuclear fission (b) occurs in reactors, not stars. Chemical reactions (c) and burning (d) are irrelevant at stellar scales.

Toxoid vaccines use inactivated bacterial toxins (e.g., diphtheria toxoid, tetanus toxoid). They induce immunity without causing disease.

Distance is the total path length traveled; displacement is the shortest distance from initial to final position. If distance = 0, the particle did not move, so displacement = 0.

Vapor pressure decreases with increasing molecular weight (stronger London dispersion forces). Order (lowest vapor pressure → highest): Heptane (C₇H₁₆) > Hexane (C₆H₁₄) > Pentane (C₅H₁₂) > Butane (C₄H₁₀).

Claustrophobia is the irrational fear of confined or enclosed spaces (e.g., elevators, small rooms). Other phobias: (b) Acrophobia (fear of heights). (c) Aquaphobia (fear of water). (d) Nyctophobia (fear of darkness).

When a vessel is filled with water, the effective mass of the system (vessel + water) increases. The natural frequency of vibration is inversely proportional to the square root of mass (f ∝ 1/√m). Thus, as mass increases, frequency decreases.

The ABO blood group system is determined by genes on chromosome 9, while the H-antigen (FUT1 gene), required for ABO antigen formation, is located on chromosome 19.

The Haversian system (osteon) is the structural unit of compact bone, containing concentric lamellae around a central canal (blood vessels/nerves). Liver (a), spleen (b), and seminal vesicles (d) lack this feature.

The resting membrane potential of neurons is ~-70 mV (inside negative relative to outside). Maintained by Na⁺/K⁺ pump and K⁺ leak channels.

Normal O₂ capacity of blood: 20 mL O₂/100 mL blood (100% saturation). 19.4 mL/20 mL × 100% = 97% saturation (typical arterial blood).

An oxymoron combines contradictory terms (e.g., “deafening silence”). A paradox similarly involves apparent contradiction (e.g., “less is more”). Other options: (b) Tautology: Redundant repetition (e.g., “free gift”). (c) Pleonasm: Overuse of words (e.g., “see with your eyes”). (d) Consistency/Harmony: Opposite of contradiction.

Graham’s Law of Diffusion: Rate of diffusion ∝ 1/√(molar mass). H₂ (M = 2 g/mol) has the lowest molar mass, so it diffuses the fastest. Order: H₂ > He (4) > N₂ (28) > CO₂ (44).

Amnesia is a medical condition characterized by memory loss. Other options: (b) Blasphemy (talking disrespectfully of sacred things). (c) Insomnia (sleeplessness). (d) Anosmia (loss of smell).

Virtual ground is a concept in op-amp circuits where a terminal (like the inverting input) is held at 0V due to feedback, but isn’t physically grounded. Ideal/real ground (a/c) refers to actual ground connections.

A brunette refers to a person (typically female) with dark brown hair. Black hair (a) is specifically “noir,” while blonde (d) is light-haired. Fair-skinned (c) is unrelated to hair color.

Using the kinematic equation h = (1/2)gt²: 80 = 1/2 × 10 × t² → t = 4 s.

Porifera (sponges) have choanocytes—flagellated cells that create water currents for filter-feeding. Other options: (a) Gland cells: Present but not defining. (c) Amoeboid cells: For nutrient distribution. (d) Pigment cells: For coloration but not unique to sponges.

Faraday’s Law states that the induced EMF is proportional to the rate of change of magnetic flux E = −dΦ/dt. Lenz’s Law (a) gives the direction of the induced EMF (opposing the change). Ampere’s (c) and Gauss’s (d) laws relate to magnetic fields and flux, not induction.

The SA-to-AV node delay is ~0.1 seconds, allowing atrial contraction before ventricular activation. This ensures efficient blood flow (atria → ventricles).

Molar mass of O₂ = 16 g/mol (but oxygen in CO₂ is O, not O₂). Each CO₂ molecule contains 2 oxygen atoms (32 g/mol of oxygen per mole of CO₂). Given 16 g of oxygen, the moles of CO₂ = 16 g/32 g/mol = 0.5 moles.