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. The exceptionally low melting point of mercury can be explained on the basis of which of the following explanations?
1. Mercury has completely filled-up atomic orbitals
2. In mercury, the binding energy of outer electrons (towards nucleus) is highest and no electron is available to participate in metallic bond formation
Choose the correct option from the codes given below:
[A] Only 1 is correct
[B] Only 2 is correct
[C] Both 1 & 2 are correct
[D] Neither 1 nor 2 is correct
Show Answer
Correct Answer: C [ Both 1 & 2 are correct]
Notes:
Mercury belongs to the zinc group of elements in the periodic table, which comprises zinc, cadmium and mercury. They all have completely filled-up atomic orbitals. It becomes difficult to knock out these electron(s) from their orbitals and form metallic bonds. With its filled shell electron configuration it is very reluctant to form bonds even with other mercury atoms.
2. Which of the following would come in use to treat diseased skin surfaces?
[A] Analgesics
[B] Antiseptics
[C] Antihistamines
[D] None of the above
Show Answer
Correct Answer: B [ Antiseptics]
Notes:
Antiseptics are applied to the living tissues such as wounds, cuts, ulcers and diseased skin surfaces. Examples of antiseptics are furacine, soframicine, etc
3. Which of the following structures are present in the throat to prevent the air passage from collapsing?
[A] Rings of cartilage
[B] Rings of muscle
[C] Rings of bone
[D] Rings of connective tissue
Show Answer
Correct Answer: A [Rings of cartilage]
Notes:
Rings of cartilage are present in the throat, specifically in the trachea or windpipe, to ensure that the air passage does not collapse. These semi-circular rings provide the necessary structural support to keep the airway open regardless of pressure changes that occur during breathing. This is very important for maintaining a clear, open path for air to flow into our lungs for respiration.
4. What is commonly known as white plague?
[A] Typhoid
[B] Malaria
[C] Tuberculosis
[D] Plague
Show Answer
Correct Answer: C [Tuberculosis]
Notes:
Tuberculosis caused by Mycobacterium tuberculie which primarily affects lungs although can affect other body too while early 19th century was called ‘white plague’ because of the large number of the people dying of its infection.
5. Which of the following cell organelle contains DNA apart from nucleus?
[A] Golgi Apparatus
[B] Mitochondria
[C] Cytoplasm
[D] Ribosome
Show Answer
Correct Answer: B [Mitochondria]
Notes:
The three organelles that contain DNA are the nucleus, mitochondria and chloroplasts. Mitochondria are unlike most organelles (with an exception of plant chloroplasts) in that they have their own set of DNA and genes that encode proteins. They are specialized structures unique to the cells of animals, plants and fungi.
6. Vermicomposting is done by ____:
[A] Bacteria
[B] Worms
[C] Fungus
[D] Animals
Show Answer
Correct Answer: B [Worms]
Notes:
Vermicomposting is the process of using worms also called red worms and micro-organisms to turn kitchen waste into black, earthy-smelling, nutrient-rich humus. Vermicompost is an excellent, nutrient-rich organic fertilizer and soil conditioner.
7. Which of the following statement is incorrect?
[A] Budding is not possible in hydra
[B] Hydra have only a sexual reproduction
[C] Most frogs are an oviparous animals
[D] Internal fertilisation takes place in hens
Show Answer
Correct Answer: B [Hydra have only a sexual reproduction]
Notes:
Hydra is radially symmetrical, that is, the parts of its body are arranged in a circle around a central median axis passing through the mouth. Hydra reproduces by asexual and sexual methods. Asexual reproduction takes place either by budding or by fission.
8. Which one of the following is not a true fish?
[A] Jellyfish
[B] Starfish
[C] Cuttlefish
[D] All of the above
Show Answer
Correct Answer: D [All of the above ]
Notes:
The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.
9. Which part of the brain is responsible for triggering actions like thinking, intelligence, memory and ability to learn?
[A] Control
[B] Cerebrum
[C] Hypothalamus
[D] Diencephalon
Show Answer
Correct Answer: B [Cerebrum]
Notes:
The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action. Functions of the cerebrum include: initiation of movement, coordination of movement, temperature, touch, vision, hearing, judgment, reasoning, problem solving, emotions, and learning.
10. Commonest mammal is ____:
[A] Elephant
[B] Lion
[C] Human
[D] Panther
Show Answer
Correct Answer: C [Human]
Notes:
Humans are likely the most numerous species of mammal on Earth at the moment.
