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State PSC Science & Technology — practice questions

Explore 311 free Science & Technology questions in State PSC Science. Open each question or exercise to read its content, reference answers and available explanation.

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Science & Technology questions and exercises with answers

Showing questions 1–30 of 311.

The organisms "Cicada, Froghopper and Pond skater" are :Read the answer and worked solution →Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow?Read the answer and worked solution →“Membrane Bioreactors” are often discussed in the context of :Read the answer and worked solution →Order how Bt toxin kills a pestRead the answer and worked solution →Mark the biotech term each clue fitsRead the answer and worked solution →Catch the gains GM crops deliverRead the answer and worked solution →Stack tools by diagnosis or therapyRead the answer and worked solution →Match each tool to the job it doesRead the answer and worked solution →Sort each result: plant or animalRead the answer and worked solution →Judge each biotechnology claimRead the answer and worked solution →Complete how RNA interference worksRead the answer and worked solution →A farmer plants cotton whose genes were altered to resist bollworms. Such an organism is a:Read the answer and worked solution →Golden rice was engineered to enhance which nutrient?Read the answer and worked solution →Bt toxin is produced by the bacterium:Read the answer and worked solution →The Bt toxin stays inactive as a protoxin until it meets the insect gut's:Read the answer and worked solution →Tobacco plants were protected from the nematode Meloidogyne incognita using:Read the answer and worked solution →Nematode-specific genes were introduced into tobacco using which vector?Read the answer and worked solution →About how many recombinant therapeutics are approved for human use worldwide?Read the answer and worked solution →Before recombinant insulin, insulin was extracted from the pancreas of:Read the answer and worked solution →Pro-insulin contains an extra stretch removed during maturation, called the:Read the answer and worked solution →Human insulin chains were first produced in E. coli in 1983 by:Read the answer and worked solution →The first clinical gene therapy in 1990 treated a girl with a deficiency of:Read the answer and worked solution →Very low concentrations of a virus can be detected before symptoms by amplifying nucleic acid with:Read the answer and worked solution →PCR is routinely used to detect which virus in suspected AIDS patients?Read the answer and worked solution →ELISA works on the principle of:Read the answer and worked solution →Over 95 percent of existing transgenic animals are:Read the answer and worked solution →Rosie, the first transgenic cow of 1997, produced milk enriched with:Read the answer and worked solution →Transgenic mice are being used to test the safety of which vaccine?Read the answer and worked solution →Which Indian body decides the validity of GM research and safety of releasing GM organisms?Read the answer and worked solution →In 1997 an American company obtained a patent on:Read the answer and worked solution →

Worked practice questions

The organisms "Cicada, Froghopper and Pond skater" are :

  1. Birds
  2. Fish
  3. Insects
  4. Reptiles
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Correct answer: C. Insects

Answer: C. Cicada, Froghopper and Pond skater are all INSECTS. (1) Cicada (Hemiptera: Cicadidae) is a true bug famous for the loud songs of males. (2) Froghopper (Hemiptera: Cercopidae) is the insect whose nymphs produce the protective 'spit' (cuckoo-spit) on plants. (3) Pond skater (Hemiptera: Gerridae) is the aquatic insect that walks on the water surface thanks to hydrophobic legs and surface tension. All three are members of the order Hemiptera (true bugs). None are birds, fish or reptiles. Source: syllabus Biology Ch 4 (Animal Kingdom) and standard entomology references.

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Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow?

  1. Nitric oxide
  2. Nitrous oxide
  3. Nitrogen dioxide
  4. Nitrogen pentoxide
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Correct answer: A. Nitric oxide

Answer: A. Nitric oxide (NO) is the body's natural vasodilator. Nitric oxide is a free-radical signalling molecule produced in the body by endothelial cells lining blood vessels. It diffuses to the smooth muscle around vessels and triggers relaxation, causing vessels to dilate and blood flow to increase. The discovery of NO as a signalling molecule won the 1998 Nobel Prize in Physiology or Medicine (Furchgott, Ignarro, Murad). Drugs like nitroglycerin work by releasing NO to relieve angina. **Distractors fail:** (B) Nitrous oxide N2O is laughing gas, an anaesthetic, not a natural vasodilator. (C) Nitrogen dioxide NO2 is a toxic air pollutant. (D) Nitrogen pentoxide N2O5 is an unstable industrial intermediate, not biologically synthesised. Source: syllabus Biology / Nobel Prize 1998 citation.

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“Membrane Bioreactors” are often discussed in the context of :

  1. Assisted reproductive technologies
  2. Drug delivery nanotechnologies
  3. Vaccine production technologies
  4. Wastewater treatment technologies
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Correct answer: D. Wastewater treatment technologies

Answer: D. Membrane bioreactors (MBRs) are used in WASTEWATER TREATMENT. MBR combines a conventional biological treatment process (activated sludge) with a membrane separation step that replaces the secondary clarifier. The membrane (microfiltration or ultrafiltration) physically separates treated water from biomass, producing high-quality effluent suitable for reuse. MBRs are widely used in municipal sewage treatment plants and industrial wastewater treatment. India's Central Pollution Control Board recognises MBR as an advanced sewage treatment technology, particularly in space-constrained urban locations. **Distractors fail:** (A) ART uses different reproductive biology equipment. (B) Drug delivery uses microspheres and liposomes, not bioreactor membranes. (C) Vaccine production uses bioreactors but not specifically membrane bioreactors as the defining technology. Source: CPCB sewage treatment guidelines / Jal Shakti Ministry technology reports.

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