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 among the following metals is the hardest metal?
[A] Platinum
[B] Gold
[C] Iron
[D] Tungsten
Show Answer
Correct Answer: D [Tungsten]
Notes:
Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals. Tungsten has the highest melting point (3422 °C, 6192 °F), lowest vapor pressure (at temperatures above 1650 °C, 3000 °F).
2. If waste materials contaminate the source of drinking water, which of the following diseases will spread?
[A] Typhoid
[B] Malaria
[C] Anaemia
[D] Scurvy
Show Answer
Correct Answer: A [Typhoid]
Notes:
Typhoid is a common worldwide bacterial disease transmitted by the ingestion of food or water contaminated with the feces of an infected person, which contain the bacterium Salmonella enterica subsp. enterica, serovar Typhi.
3. Symbiotic Bacteria responsible for the fixation of atmospheric nitrogen are present in ____:
[A] Peas
[B] Oats
[C] Corn
[D] Wheat
Show Answer
Correct Answer: A [Peas]
Notes:
Nitrogen-fixing bacteria are microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen. Rhizobium is one such bacteria that is associated with leguminous plants (e.g., various members of the pea family). It invades the root hairs of host plants and convert free nitrogen to ammonia, which the host plant utilizes for its development.
4. A spore producing plant is ____:
[A] Rose
[B] Potato
[C] Ginger
[D] Bread mould
Show Answer
Correct Answer: D [Bread mould]
Notes:
Mould is a member of the fungi kingdom. Fungi can be defined as a plant without chlorophyll, so it cannot get energy directly from the sun. This means that fungi must use other plants and animals as its food source. This is why bread mould is so common because of the ingredients in bread, it is an excellent source of nutrition for many moulds to grow and thrive.
5. Oxygenated blood is carried by _____:
[A] Hepatic portal vein
[B] Renal vein
[C] Pulmonary artery
[D] Pulmonary vein
Show Answer
Correct Answer: D [Pulmonary vein]
Notes:
The pulmonary veins drain oxygenated blood from the lungs to the left atrium. A small amount of blood is also drained from the lungs by the bronchial veins. There are typically four pulmonary veins, two draining each lung. The pulmonary veins are part of the pulmonary circulation.
6. The most suitable soil for the production of cotton is ____:
[A] Alluvial soil
[B] Well drained soil
[C] Loamy soil
[D] Black lava soil
Show Answer
Correct Answer: D [Black lava soil]
Notes:
Black soil is most suitable for the cultivation of cotton. The deep and medium black lava soil of the Deccan and Malwa plateaus is considered ideal, though it can be grown on alluvial and red soil as well. The black cotton soil is also known as regur.
7. The hydrophilic nature of DNA is due to the presence of ____:
[A] A number of hydrogen bonds
[B] Phosphate group
[C] Thymine base
[D] Deoxyribose sugar
Show Answer
Correct Answer: A [A number of hydrogen bonds]
Notes:
The phosphate groups on DNA are ionic and charged. Each phosphate group on the DNA backbone has one unit of negative charge (-1). Charged molecules attract water and are hydrophilic. DNA has two hydrophilic polar external backbones made of sugars and phosphate groups joined by ester bonds. Therefore, DNA as nucleic acid is characterized by presence of phosphodiester bond.
8. ____ is the branch of zoology concerned with the study of amphibians:
[A] Herpetology
[B] Ethology
[C] Mammology
[D] Morphology
Show Answer
Correct Answer: A [Herpetology]
Notes:
Herpetology is the branch of zoology concerned with the study of amphibians (including frogs, toads, salamanders, newts, and caecilians (gymnophiona)) and reptiles (including snakes, lizards, amphisbaena, turtles, terrapins, tortoises, crocodilians, and the tuataras). It is the study of ectothermic (coldblooded) tetrapods.
9. Chromosomes consist of ____:
[A] DNA and lipids
[B] RNA and amino acids
[C] DNA and proteins
[D] RNA and sugar
Show Answer
Correct Answer: C [DNA and proteins]
Notes:
A chromosome is an organized structure of DNA and protein found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions.
10. Bones are pneumatic in ____:
[A] Birds
[B] Fishes
[C] Reptiles
[D] Amphibians
Show Answer
Correct Answer: A [Birds]
Notes:
Pneumatic bone is hollow bone filled with air, connected to the respiratory system. Many of a bird’s bones are pneumatic as an adaptation to flying. For flight to occur in Aves, four physical forces (thrust and drag, lift and weight) must work together. In order for birds to balance these forces, certain physical characteristics are required. Which most of the flying birds have acquired in one way or other.