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
31. On an average how many million Red Blood Cells are present in a healthy human adult man per mm3 of blood?
[A] 1.5 – 2
[B] 2 – 2.5
[C] 5 – 5.5
[D] 9 – 9.5
Show Answer
Correct Answer: C [5 – 5.5]
Notes:
The primary function of the red blood cells, or erythrocytes, is to carry oxygen from the lungs to body tissues and to transfer carbon dioxide from the tissues to the lungs. The RBC is a count of the number of red blood cells per cubic millimeter of blood. Newborns: 4.8 – 7.2 million Adults: (males): 4.6 – 6.0 million
32. The heat treatment applied to milk before distribution to stabilize and to remove disease causing bacteria is called as ____:
[A] Coagulation
[B] Fermentation
[C] Pasteurisation
[D] Homogenisation
Show Answer
Correct Answer: C [Pasteurisation]
Notes:
Pasteurisation is a process of heating milk for 30 minutes at 62° C and cooling rapidly to kill harmful bacteria and prevent their further proliferaction. Because of the nature of the heat treatment it sometimes referred to as the ‘High Temperature Short Time’ (HTST) process. Once the milk has been heated, it is then cooled very quickly to less than 3°C.
33. Liver-oil of fish is rich in ____:
[A] Vitamin A
[B] Vitamin C
[C] Vitamin D
[D] Vitamin E
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Cod liver oil is the oil extracted from the livers of Atlantic cod. It is commonly taken as a dietary supplement and is packed full of nutrients. It is one of the best sources of omega 3 fatty acids (EPA and DHA), and it contains relatively high amounts of vitamin A and vitamin D. It is a vital nutrient for immune system function, cellular growth, eye health, and reproduction. It decreases blood clot formation and reduce inflammation in the body.
34. Methane contributes towards global warming so it is called a ____ gas:
[A] Greenhouse
[B] Poisonous
[C] Infectious
[D] Carcinogenic
Show Answer
Correct Answer: A [Greenhouse]
Notes:
Methane (CH4) is a greenhouse gas and causes warming the same way that CO2 does. It absorbs radiation emitted from the surface and re-emits that radiation in all directions with some of the radiation returning to the surface where it is absorbed and converted to heat. In the first two decades after its release, methane is 84 times more potent than carbon dioxide.
35. The International Commisson on Zoological Nomenclature was established in _____:
[A] 1664
[B] 1898
[C] 1988
[D] 2001
Show Answer
Correct Answer: C [1988]
Notes:
The International Commission on Zoological Nomenclature (ICZN) was founded in 1895. It provides and regulates a uniform system of zoological nomenclature ensuring that every animal has a unique and universally accepted scientific name.
36. Which protein-sugar pair is present in milk?
[A] Casein, Sucrose
[B] Casein, Lactose
[C] Ferritin, Maltose
[D] Albumin, Glucose
Show Answer
Correct Answer: B [Casein, Lactose]
Notes:
Casein-Lactose protein-sugar pair is present in milk. Normal bovine milk contains 30-35 grams of protein per litre of which about 80 percent is arranged in casein micelles. Casein is present in milk, but it’s not a milk sugar like lactose. Instead, casein is one of the proteins found in milk. Unlike lactose, which causes an intolerance, these proteins in milk are what’s responsible for a milk allergy, according to Food Allergy and Research Education.
37. An invertebrate does not have _____:
[A] Notochord
[B] Body cavity
[C] Haemocoel
[D] Gills
Show Answer
Correct Answer: A [Notochord]
Notes:
All verteberates have notochord, body cavity and gills in their embryonic stage or adult stage but not have haemocoel. It’s presence is well marked in the members of phylum in Arthopoda.
38. Cod is a variety of _____:
[A] Fish
[B] Crop
[C] Coral
[D] Goat
Show Answer
Correct Answer: A [Fish]
Notes:
Cod is the common name for the genus Gadus of demersal fishes, belonging to the family Gadidae. Cod is also used as part of the commons name for a number of other fishes, and there are species suggested to belong to genus Gadus that are not called cod (the Alaska pollock). Cod is popular as a food with a mild flavour and a dense, flaky white flesh. Cod livers are processed to make cod liver oil, an important source of vitamin A, vitamin D, vitamin E and omega-3 fatty acids (EPA and DHA).
39. Which of the following is a monogenetic parasite?
[A] Hydra
[B] Earthworm
[C] Fasciola
[D] Ascaris
Show Answer
Correct Answer: D [Ascaris]
Notes:
Monogenetic parasites are the parasites that complete their life cycles in one host only. Ascaris is a monogenetic parasite as it completes it life cycle in a single host, i.e., man.
40. During exhalation, the ribs ____:
[A] Move outwards
[B] Move downwards
[C] Move upwards
[D] Do not move at all
Show Answer
Correct Answer: B [Move downwards]
Notes:
Breathing is the process in which air moves in and out of the lungs with the help of various respiratory organs. The process of taking in air rich in oxygen is called inhalation. Similarly, the process of giving out air rich in carbon dioxide is called exhalation. When we inhale, the ribs move up and outwards while the diaphragm moves down. An exact opposite movement occurs during exhalation when the ribs move down and inwards while the diaphragm moves up.
