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. As per the Mohs scale of mineral hardness, which of the following are soft metals?
- Gold
- Copper
- Diamond
- Thorium
Select the correct option from codes given below:
[A] 1 & 4 Only
[B] 1, 2 & 4 Only
[C] 2 & 4 Only
[D] 1, 2, 3 & 4
Show Answer
Correct Answer: B [ 1, 2 & 4 Only]
Notes:
As per the Mohs scale of mineral hardness, the soft metals are: Lead, gold, silver, tin, zinc, aluminium, thorium, copper, brass and bronze. Diamond is one of the hardest known metals on earth.
2. Which of the following celestial bodies contains abundant quantities of helium3 as a potential source of energy?
[A] Moon
[B] Earth
[C] Sun
[D] Mars
Show Answer
Correct Answer: A [Moon]
Notes:
The Moon has been bombarded with large quantities of Helium-3 by the solar wind. It is thought that this isotope could provide safer nuclear energy in a fusion reactor, since it is not radioactive and would not produce dangerous waste products.
3. Who discovered electron?
[A] J. chadwick
[B] Ernest Rutherford
[C] J.J.Thomson
[D] E.Goldstein
Show Answer
Correct Answer: C [J.J.Thomson]
Notes:
In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged.
4. Both, haemoglobin and myoglobin require ____ for formation:
[A] Vitamin A
[B] Vitamin B12
[C] Iron
[D] Calcium
Show Answer
Correct Answer: C [Iron]
Notes:
Haemoglobin is called as tetrameric hemoprotein, while myoglobin is called monomeric protein. Haemoglobin is found systematically all over the body, while myo-globin is found in muscles tissues only. The body requires iron for the synthesis of its oxygen transport proteins, in particular hemo-globin and myoglobin.
5. Jellyfish are an example of which type of phylum?
[A] Phylum -Protozoa
[B] Phylum -Porifera
[C] Phylum – Cnidaria
[D] Phylum -Ctenophora
Show Answer
Correct Answer: C [Phylum – Cnidaria]
Notes:
Cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. ? Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.
6. Which of the following cell organells are present only in plant cell?
[A] Lysosomes
[B] Plastids
[C] Mitochondria
[D] Cell membrane
Show Answer
Correct Answer: B [Plastids]
Notes:
The plastid is a major double-membrane organelle found in the cells of plants. Plastids are the site of manufacture and storage of important chemical compounds used by the cell. Plastids often contain pigments used in photosynthesis, and the types of pigments present can change or determine the cell’s colour.
7. The main protein found in milk is ____:
[A] Globulin
[B] Globin
[C] Casein
[D] Albumin
Show Answer
Correct Answer: C [Casein]
Notes:
The major proteins in milk are casein and whey. These two milk proteins are both excellent sources of all the essential amino acids, but they differ in one important aspect—whey is a fast-digesting protein and casein is a slow-digesting protein. As a food source, casein supplies amino acids, carbohydrates, and the two inorganic elements calcium and phosphorus.
8. 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.
9. In a food chain, the solar energy utilized by plants is only ____:
[A] 10 per cent
[B] 1 per cent
[C] 0.1 per cent
[D] 0.01 per cent
Show Answer
Correct Answer: C [0.1 per cent]
Notes:
Plants, on average, capture only about 0.1 0.4 percent of the solar energy reaching Earth. However, it does not mean that the rest is a “vast untapped reservoir” awaiting man’s exploitation. All biological systems, including crops, follow the second law of thermodynamics when solar energy (a high-energy form) is converted into chemical energy. Plants utilize this chemical energy in the process of building their own tissue.
10. The bark of willow tree is a source of which medicine?
[A] Paracetamol
[B] Aspirin
[C] Antiseptic
[D] Antacid
Show Answer
Correct Answer: B [Aspirin]
Notes:
The bark of the common Willow tree is the source of a wide range of phenolic glycosides, of which the most important is salicin. Salicin is metabolized into salicylic acid in the human body, and is a precursor of aspirin. It is used as a fever reducer, a mild pain reliever, and an anti-inflammatory.
