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. Night blindness is caused due to ____:
[A] Excess secretion of pineal gland
[B] Less drinking of water
[C] Vitamin A deficiency
[D] Inheritance by X-chromosome
Show Answer
Correct Answer: C [Vitamin A deficiency]
Notes:
Vitamin A deficiency results in night blindness, the inability or reduced ability to see in dim light or darkness. Also known as nyctalopia, night blindness is due to a disorder of the cells in the retina that are responsible for vision in dim light which is caused by Vitamin A deficiency.
32. Which one of the following animals belongs to mollusca?
[A] Haliotis
[B] Hare
[C] Hydra
[D] Hyla
Show Answer
Correct Answer: B [Hare]
Notes:
Sea hares are molluscs. They belong to Phylum Mollusca and Class Gastropoda like snails. Like many other sea slugs (Subclass Opistobranchia), sea hares lack external shells as adults. Sea hares belong to Order Anaspidea.
33. Which of the following does not act both as an exocrine gland and as an endocrine gland?
[A] Pituitary
[B] Ovary
[C] Pancreas
[D] Testis
Show Answer
Correct Answer: A [Pituitary]
Notes:
Pituitary gland only acts pure endocrine gland secreting only hormones. The three others i.e. pancreas and gonads secrete extra cellular enzymes and factors too like gametes by gonads.
34. Turmeric is a modified ____:
[A] Stem
[B] Root
[C] Leaves
[D] Fruit
Show Answer
Correct Answer: A [Stem]
Notes:
Turmeric, (Curcuma longa) is a perennial herbaceous plant of the ginger family (Zingiberaceae) that is tuberous rhizomeor underground stem. The turmeric plant is identifiable by both its characteristic tuberous root and the leaves that extend upward from erect, thick stems arising from the root. Turmeric root is actually a fleshy oblong tuber that is tapered at each end.
35. Which of the following disease does not spread through the air?
[A] Cough-cold
[B] Pneumonia
[C] Cholera
[D] Tuberculosis
Show Answer
Correct Answer: C [Cholera]
Notes:
Cholera is an infection of the small intestine by some strains of the bacterium Vibrio cholerae. It is a water borne disease. Tuberculosis (TB) is an infectious disease usually caused by the bacterium Mycobacterium tuberculosis (MTB). Tuberculosis, Cough-cold and Pneumonia are air borne diseases.
36. Which one of the following statements about Pyrolysis, which is a process for solid waste treatment is incorrect?
[A] It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy
[B] The process occurs at a temperature above 430°C at atmospheric pressure
[C] The process occurs under high pressure at temperature above 430° C
[D] It is a thermochemical decomposition of organic waste
Show Answer
Correct Answer: B [The process occurs at a temperature above 430°C at atmospheric pressure]
Notes:
Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
37. Nutrients are recycled in the atmosphere with the help of certain micro-organisms referred to as ____:
[A] Producers
[B] Consumers
[C] Decomposers
[D] None of the above
Show Answer
Correct Answer: C [Decomposers]
Notes:
Decomposers recycle nutrients in the atmosphere. The nutrient cycle is a system where energy and matter are transferred between living organisms and non-living parts of the environment. This occurs as animals and plants consume nutrients found in the soil, and these nutrients are then released back into the environment via death and decomposition.
38. Which amongst the following is the largest mammal?
[A] Dinosaur
[B] Rhinoceros
[C] Whale
[D] Elephant
Show Answer
Correct Answer: C [Whale]
Notes:
Blue whales are the largest animals ever known to have lived on Earth. These magnificent marine mammals rule the oceans at up to 100 feet (30 meters) long and upwards of 200 tons (181 metric tons). Their tongues alone can weigh as much as an elephant. Their hearts, as much as an automobile. Blue whales reach these mind-boggling dimensions on a diet composed nearly exclusively of tiny shrimplike animals called krill. During certain times of the year, a single adult blue whale consumes about 4 tons (3.6 metric tons) of krill a day.
39. Contraceptive pills in the market contain ____:
[A] Antibiotics
[B] Herbicides
[C] Inorganic compounds
[D] Steroid hormones
Show Answer
Correct Answer: D [Steroid hormones]
Notes:
Contraceptive pills in the market contain steroid hormones like levonorgestrel, progestrogen, estrogen etc. Every brand of combined pill on the market contains the same type of synthetic oestrogen, ethinyl estradiol, and one of eight synthetic progesterones, called progestins. These hormones are made naturally in a woman’s ovaries.
40. Comose seeds are seeds with ____:
[A] Long hairs
[B] Hooks
[C] Wings
[D] Bristles
Show Answer
Correct Answer: A [Long hairs]
Notes:
The word ‘comose’ means ‘hairy’ in Latin. It refers to certain seeds (such as cotton) having a tuft or tufts of hair. The seeds of plants like Calotropis, Gossypium, etc, possess a large number of hair which enable them to float in air. Such seeds with hair are described as comose.