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. Which of the following is correct about effective nuclear charge experienced by the orbital?
[A] it increases with increase of azimuthal quantum number
[B] it increases with increase of magnetic quantum number
[C] it decreases with increase of azimuthal quantum number
[D] It is same everywhere
Show Answer
Correct Answer: C [it decreases with increase of azimuthal quantum number]
Notes:
Because of the screening effect, the net positive charge experienced by the electron from the nucleus is lowered and is known as effective nuclear charge. Effective nuclear charge experienced by the orbital decreases with increase of azimuthal quantum number(l).
2. Which of the following antiseptic compounds is present in Dettol?
[A] Iodine
[B] Cresol
[C] Chloroxylenol
[D] Biothional
Show Answer
Correct Answer: C [ Chloroxylenol ]
Notes:
Chloroxylenol, also known as para-chloro-meta-xylenol, is an antiseptic and disinfectant which is used for skin disinfection and cleaning surgical instruments. It is also used within a number of household disinfectants and wound cleaners.
3. The best milch breed in the word is ____:
[A] Chittagong
[B] Holstein-Friesian
[C] Deoni
[D] Sindhi
Show Answer
Correct Answer: B [Holstein-Friesian]
Notes:
Holstein Friesian cows are world’s highest-production dairy animals and dominate the global dairy industry. These cows originated in Dutch provinces of North Holland and Friesland, and Schleswig-Holstein in Northern Germany. They are known as Holsteins in North America and Friesians in UK and Ireland.
4. Which gas is major contributor to greenhouse effect?
[A] Chloroflurocarbon
[B] Nitrogen dioxide
[C] Sulphur dioxide
[D] Carbon dioxide
Show Answer
Correct Answer: D [Carbon dioxide]
Notes:
Greenhouse gases that occur both naturally and from human activities include water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ozone (O3). These gases contribute to atmospheric warming when they absorb infrared radiation emitted by the solar-warmed Earth and transfer their extra energy to the surrounding atmospheric gases.
5. Which of the following is/are agent(s) of infection?
[A] Physical contact
[B] Water
[C] Vectors
[D] All of the above
Show Answer
Correct Answer: D [All of the above ]
Notes:
Infection is the invasion of an organism’s body tissues by disease-causing agents, their multiplication, and the reaction of host tissues to the infectious agents and the toxins they produce. Infectious diseases can be spread from one person to another, for example through contact with bodily fluids, by aerosols (through coughing and sneezing), or via a vector, for example a mosquito.
6. If in any water Body, there is high BOD value then it is generally ____:
[A] Very clean
[B] Highly productive
[C] Very polluted
[D] Highly unproductive
Show Answer
Correct Answer: C [Very polluted]
Notes:
Biochemical Oxygen Demand or Biological Oxygen Demand, is a measurement of the amount of dissolved oxygen (DO) that is used by aerobic microorganisms when decomposing organic matter in water. It indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water.
7. Bile is produced by the ____:
[A] Liver
[B] Stomach
[C] Pancreas
[D] Duodenum
Show Answer
Correct Answer: A [Liver]
Notes:
Bile or gall is a bitter-tasting, dark green to yellowish brown fluid, produced by the liver aids in the process of digestion of lipids in the small intestine. In many species, bile is stored in the gall bladder and upon eating is discharged into the duodenum. Bile is a composition of the following materials: water (85%), bile salts (10%), mucus and pigments (3%), fats (1%), inorganic salts (0.7%) and cholesterol (0.3%).
8. Which of the following is an endangered species?
[A] Gangetic dolphin
[B] Blue sheep
[C] Black buck
[D] Mithun
Show Answer
Correct Answer: B [Blue sheep]
Notes:
According to the Red list of 2012, Ganges River Dolphin is one of critically endangered species in India. Endangered species in India comprise large varieties of rare species of wild animals, aquatic animals and insects.
9. Which of the following diseased person can still donate eyes?
[A] AIDS patient
[B] Asthma patient
[C] Acute leukaemia patient
[D] Both Asthma and Acute leukaemia patient
Show Answer
Correct Answer: B [Asthma patient]
Notes:
Persons with AIDS, Hepatitis B and C, Rabies, Septicaemia, Acute leukemia (Blood cancer), Tetanus, Cholera, and infectious diseases like Meningitis and Encephalitis cannot donate eyes. Even people with diabetes, asthma, hypertension, or persons wearing spectacles and who had undergone cataract surgery can also donate eyes.
10. The total number of living organisms, both plants and animals, in a given area is called ____:
[A] Buffers
[B] Biomass
[C] Batholith
[D] Barrage
Show Answer
Correct Answer: B [Biomass]
Notes:
A biomass is total quantity of weight of the planet that can be classified according to the plants and animals that live in it. Temperature, soil, and the amount of light and water help determine what life exists in a biome.
