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 of the following are used as chemical agents in war?
- Mustard Gas
- Phosgene
- Sarin
- VX
Select the correct option from codes given below:
[A] 1 & 3 Only
[B] 1, 3 & 4 Only
[C] 2 & 4 Only
[D] 1, 2, 3 & 4
Show Answer
Correct Answer: D [ 1, 2, 3 & 4]
Notes:
Chemical weapons are called “poorman’s bomb”. These cause catastrophic damage, and are easy to produce. Sarin is a colorless and odourless agent, and is extremely potent. It was used in Damascus in 2013. Mustard Gas is possibly the most commonly used chemical agent and gets its name from the distinctive odour of rotten mustard. It is less potent and usually only 5 to 10 percent people exposed to it usually die. It was widely used during Second World War. VX is a nerve agent which is odourless and appears as brownish oily substance.
2. What is the common name of ‘Ca(ClO)2’?
[A] Baking Soda
[B] Bleaching Powder
[C] Washing Soda
[D] Baking Powder
Show Answer
Correct Answer: B [Bleaching Powder]
Notes:
Calcium hypochlorite is an inorganic compound with formula Ca(ClO)2. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agents.
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. The best milch breed in the word is ____:
[A] Chittagong
[B] Holstein-Friesian
[C] Deoni
[D] Sindhi
Show Answer
Correct Answer: B [Holstein-Friesian]
Notes:
Holstein Friesian cows are world’s highest-production dairy animals and dominate the global dairy industry. These cows originated in Dutch provinces of North Holland and Friesland, and Schleswig-Holstein in Northern Germany. They are known as Holsteins in North America and Friesians in UK and Ireland.
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. If in any water Body, there is high BOD value then it is generally ____:
[A] Very clean
[B] Highly productive
[C] Very polluted
[D] Highly unproductive
Show Answer
Correct Answer: C [Very polluted]
Notes:
Biochemical Oxygen Demand or Biological Oxygen Demand, is a measurement of the amount of dissolved oxygen (DO) that is used by aerobic microorganisms when decomposing organic matter in water. It indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water.
7. 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.
8. The pigment that gives human skin, hair and eyes their colour is called ____:
[A] Quinacridone
[B] Alizarin
[C] Melanin
[D] Phthalocyanine
Show Answer
Correct Answer: C [Melanin ]
Notes:
The pigment that gives human skin, hair, and eyes their color. Dark-skinned people have more melanin in their skin than light-skinned people have. Melanin is produced by cells called melanocytes. Everyone has the same number of melanocytes, but some people make more melanin than others.
9. Which of the following is the smallest bird?
[A] Parrot
[B] Pigeon
[C] Hummingbird
[D] House sparrow
Show Answer
Correct Answer: C [Hummingbird ]
Notes:
Humming birds are birds that comprise the family Trochilidae. They are among the smallest of birds, most species measuring in the 7.5–13 cm (3–5 in) range. Indeed, the smallest extinct bird species is a humming bird, the 5-cm Bee Humming bird. These birds being the smallest are, capable of flying both in forward and back direction.
10. 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.
