General Science Questions (MCQs) for Competitive Examinations
General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations. These questions are part of GKToday’s 35000+ MCQs Bank Course in GKToday Android App
1. Who among the following scientists had discovered Radium?
[A] Marie Sklodowska-Curie and Pierre Curie
[B] André-Louis Debierne
[C] Kasimir Fajans
[D] Oswald Helmuth Göhring
Show Answer
Correct Answer: A [Marie Sklodowska-Curie and Pierre Curie ]
Notes:
Radium is a chemical element with the symbol Ra and atomic number 88. Radium was discovered by Marie Sklodowska Curie, a Polish chemist, and Pierre Curie, a French chemist, in 1898.
2. Which of the following protein is found in nails?
[A] Keratin
[B] Histone
[C] Actin
[D] Elastin
Show Answer
Correct Answer: A [Keratin]
Notes:
Keratin is a family of fibrous structural proteins that is the key structural component of hair and nails. It is also the key structural material making up the outer layer of human skin. Besides, it provides the necessary strength and toughness for masticatory organs, such as the tongue.
3. Chromosome designation of Turner sydrome is ____:
[A] 44A+XO
[B] 44A+XXX
[C] 44A+XXY
[D] 44A+XYY
Show Answer
Correct Answer: A [44A+XO]
Notes:
Turner syndrome is a rare chromosomal disorder characterized by partial or complete loss (monosomy) of one of the X chromosomes that affects females. Individuals with Turner syndrome have only 45 chromosomes, including just a single X chromosome. This monosomic has a chromosome complement of 44 autosomes and one X chromosome (44+XO). The abnormal condition probably originates from exceptional egg or sperm with no X chromosome.
4. Uric acid is the chief nitrogenous wastes in ____:
[A] Frogs
[B] Birds
[C] Fishes
[D] Mankind
Show Answer
Correct Answer: B [Birds]
Notes:
Land snails, insects, birds, and some reptiles excrete uric acid as the major nitrogenous waste. The white, crystalline substance seen in a typical bird or lizard “poop” is actually urine: a little pool of uric acid crystals in a very small amount of water.
5. Which of the following plant hormones are incorrectly paired?
[A] Cytokinins- senescence
[B] Abscisic acid- transpiration
[C] Auxins- apical dominance
[D] Gibberlins- bud and seed dormancy
Show Answer
Correct Answer: B [Abscisic acid- transpiration]
Notes:
Abscisic acid also called plant stress hormone is responsible for responsible for dormancy of various types. It maintains dormancy in seeds and buds, stimulates the closing of stomata. Gibberellins are responsible for cell division and growth in cell size.
6. Carolus Linnaeus System of classification is ____:
[A] Phylogenetic
[B] Binomial
[C] Natural
[D] Artificial
Show Answer
Correct Answer: B [Binomial]
Notes:
Swedish naturalist Carlous Linnaeus established the binomial system of naming living organisms, setting a format and a structured process for classifying the interrelationships between plants (among which he included all fungi), and between animals. The binomial system that Linnaeus devised enables an author to refer to a species confident that it will mean the same thing to informed readers anywhere else in the world.
7. Which of the following processes are associated with plants during dark period?
[A] Respiration and transpiration
[B] Transpiration and conduction
[C] Photosynthesis and respiration
[D] Conduction and respiration
Show Answer
Correct Answer: D [Conduction and respiration]
Notes:
Conduction is the process by which vital nutrients are transported to the different parts of a plant. This process is independent of the light factor. Respiration process in plants is the intake of carbon-dioxide and exhales oxygen during the day as the plants gets energy through the photosynthesis process in which the carbon-dioxide is converted into sugars using the sun light energy, as this process uses carbon-dioxide and water, the resulting gas oxygen is given out as a waste product. During the night, as the photosynthesis process does not take place it exhales the carbon-dioxide itself.
8. Fat present below the skin surface in our body acts as a barrier against ____:
[A] Loss of heat from the body
[B] Loss of salt from the body
[C] Loss of essential body fluids
[D] Entry of harmful micro-organisms from the environment
Show Answer
Correct Answer: A [Loss of heat from the body]
Notes:
A layer of body fat acts as an insulator and traps heat. The subcutis is the deepest layer of skin. The subcutis, consisting of a network of collagen and fat cells, helps conserve the body’s heat and protects the body from injury by acting as a “shock absorber.
9. Why do the plant closes stomata when it does NOT need carbon dioxide for photosynthesis?
[A] To store carbon dioxide
[B] To prevent water loss
[C] To release stored oxygen
[D] None of the above
Show Answer
Correct Answer: B [To prevent water loss]
Notes:
Stomata are tiny openings or pores in plant tissue that allow for gas exchange. Stomata allow a plant to take in carbon dioxide, which is needed for photosynthesis. They also help to reduce water loss by closing when conditions are hot or dry. Stomata look like tiny mouths which open and close as they assist in transpiration.
10. Water which is suitable for drinking is called ___ water:
[A] Potable
[B] Sanitary
[C] Hygienic
[D] Sparkling
Show Answer
Correct Answer: A [Potable]
Notes:
Potable water is water of a quality suitable for drinking, cooking and personal bathing. It is water that is safe to drink or to use for food preparation. In developed countries, tap water is usually potable.