General Science Mixed Practice — MCQs with Answers (Set 2)

Statements 1 and 3 are correct. The order covers only medicines that mix both drugs. Single-drug medicines, like those with only phenylephrine, are not covered. The warning must be on the label, the leaflet and adverts.

Chlorpheniramine is an antihistamine that eases runny nose and sneezing. Phenylephrine is a decongestant that opens a blocked nose.

DTAB is set up under Section 5 of the Drugs and Cosmetics Act, 1940. The Director General of Health Services is its ex officio Chairman. The DCGI heads CDSCO and is a member of DTAB.

Both are true, and R explains A. The 2018 ban of 328 FDCs and the 2024 ban of 156 FDCs both used Section 26A.

The order is 3-1-2-4. 344 FDCs were banned in March 2016. 328 were banned in September 2018. 156 were banned in August 2024. The under-four warning was extended in August 2026.

The answer is 1, 2 and 3. Speed rises by 2 m/s every second (uniform acceleration of 2 m/s^2); the distance covered works out to 16 m in 4 s, giving an average speed of 4 m/s.

The answer is that carbon dioxide is fixed into carbohydrates during photosynthesis, with oxygen released as a byproduct rather than used as a raw material.

The answer is Neon, the gas behind the classic red glow of neon signs when electrified.

Genuine currency notes carry special fluorescent fibres, threads, and inks that are invisible in normal light. Under ultraviolet light, these hidden security features glow and become clearly visible. This makes UV lamps a simple, common tool for checking currency notes for forgery.

The answer is gold, nickel and palladium, a common alloy composition that gives white gold its pale, silvery colour.

Melanin absorbs ultraviolet rays from sunlight before they can damage the DNA in skin cells. People with more melanin in their skin generally have greater natural protection against sunburn and UV-related skin damage. Melanin does not meaningfully block infrared, X-ray, or radio wave radiation.

The answer is caustic soda (sodium hydroxide). It’s used to remove gums and lignin from the raw plant fibre during pulping.

The correct answer is methane. PIB says dumpsites release methane, a highly potent greenhouse gas. The Rules ask landfills to install a gas collection system. Microbes break down buried organic waste without oxygen, and the gas they make is methane.

The answer is about 3300 m. Since light travels essentially instantaneously compared to sound, the storm’s distance is simply the speed of sound times the 10-second delay: 330 x 10 = 3300 m.

The correct answer is Sericin, per the official answer key. Sericin is the gummy protein coating the silk filament (fibroin); it is credited with giving raw silk fibre its characteristic lustrous sheen.

The answer is that regulatory mechanisms break down. This loss of control over cell division and differentiation leads to abnormal tumor growth.

The answer is a pressure larger than the osmotic pressure. Exceeding the osmotic pressure forces water molecules to move against their natural gradient, leaving salts behind.

The answer is 2 and 3. Reactors sustain a steady, controlled chain reaction at exact criticality, while a bomb’s reaction is deliberately uncontrolled and pushed rapidly past criticality; reactors, not bombs, rely on moderators to slow neutrons.

Cobalt-60 is a radioactive isotope that emits gamma rays as it decays. These gamma rays are aimed at tumours to shrink or destroy cancerous cells in radiotherapy machines. Cobalt-60 therapy has been used since 1951 and remains important in techniques like the gamma knife.

The answer is Ecosystem. It describes the community of living organisms interacting with their physical environment as a functional unit.

The answer is Colostrum. This early, antibody-rich milk produced right after birth gives the newborn crucial passive immunity.

The answer is Thermosetting plastic. Once set, it holds a rigid molecular structure that resists softening even under hot water, unlike thermoplastics.

The answer is a thunderstorm. Seeing lightning well before hearing its thunder shows light reaching us far faster than sound.

The answer is Oyster. Pearls form inside oysters as a defence response to an irritant lodged in their shell.

The answer is the fission bomb dropped on Hiroshima in August 1945, codenamed ‘Little Boy.’ Nagasaki’s bomb, ‘Fat Man,’ was a plutonium implosion device.