General Science Multiple choice questions mcqs

General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations.pcs fpsc css

1.The web of the spider is made up of which among the following?

[A] Carbohydrate Polymers
[B] Proteins
[C] Lipids
[D] Polysaccharides

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Correct Answer: B [Proteins]

Notes:
Spiders use their silk to make web. Spider silk is made out of protein. 

2.What happens to the weight of Iron, when it rusts?

[A] Increases for long time
[B] Decreases then increases
[C] Increases then decreases
[D] Remains the same

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Correct Answer: C [Increases then decreases]

Notes:
When iron or any other metal oxidizes, oxygen from the air combines with the iron to make iron oxide or rust. So, weight of the bar increases, due to the increased weight of oxygen which has combined with the iron. over time, the weight of the iron bar will tend to decrease, due to factors related more to erosion than to chemistry.

3.Which among the following is major component of Gobar Gas?

[A] Butane
[B] Ethane
[C] Propane
[D] Metahne

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Correct Answer: D [Metahne]

Notes:
Gobar Gas or Biogas is mostly methane (CH₄) and carbon dioxide (CO₂) and may have small amounts of hydrogen sulfide (H₂S), moisture and siloxanes.

4.Hepatitis A which is the most common cause of jaundice in young people is an infection of liver by ________?

[A] Bacteria
[B] Virus
[C] Amoeba
[D] Prortozoan

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Correct Answer: B [Virus]

Notes:
Hepatitis A which is the most common cause of jaundice in young people is an infection of liver by virus. It is transmitted through ingestion of contaminated food and water or through direct contact with an infectious person.

5.Enterobius vermicularis which affect the caecum and vermiform appendix is commonly called as ?

[A] Tapeworm
[B] Pinworm
[C] Threadworm
[D] Ringworm

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Correct Answer: B [Pinworm]

Notes:
Enterobius vermicularis which affect the caecum and vermiform appendix is commonly called as Pinworm. Pinworms are tiny, narrow worms and are white in color and less than a half-inch long.

6.Diabetes insipidus (DI) caused by a deficiency of arginine vasopressin (AVP), also known as antidiuretic hormone (ADH). This hormone is secreted by which endocrine gland?

[A] Thyroid Gland
[B] Pituitary Gland (Hypophysis)
[C] Pancreas
[D] Liver

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Correct Answer: B [Pituitary Gland (Hypophysis)]

Notes:
Diabetes insipidus (DI) is caused by a deficiency of arginine vasopressin (AVP), also known as antidiuretic hormone (ADH). Antidiuretic hormone is secreted by Pituitary Gland which is also called Hypophysis.

7.Who among the following coined the term Bacterium?

[A] Antonie van Leeuwenhoek
[B] Christian Gottfried Ehrenberg
[C] Louis Pasteur
[D] Robert Koch

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Correct Answer: B [Christian Gottfried Ehrenberg]

Notes:
Christian Gottfried Ehrenberg was a was one of the most famous and productive scientists of his time. He was a German naturalist, zoologist, comparative anatomist, geologist, and microscopist. He coined the term Bacterium.

8.For Lemurs, which among the following is a correct group to place in ?

[A] Rodents
[B] Primates
[C] Bats
[D] Sloths

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Correct Answer: B [Primates]

Notes:
Lemurs are mammals of the order Primates which are native only to the island of Madagascar. They are divided into 8 families and it consists of 15 genera and around 100 existing species.

9.Among Alpha, Beta and Gamma radiations:
1. The Alpha Particles have highest ionising power but least penetrating power
2. The Gamma radiations have highest penetration power but lowest ionising power
Which among the above is / are correct statements?

[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2

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Correct Answer: C [ Both 1 & 2]

Notes:
Alpha-particles

1. They are doubly ionised helium nuclei having a mass equal to 6.64 × 10–27 kg and charge equal to 3.2 × l0–19 C.
2. They have the highest ionising power.
3. They have the least penetrating power.
4. They produce fluorescence in the zinc sulphide screen.

Beta-particles.

1. They are negatively charged particles, having a charge equal to –1.6 × 10– 19 C and mass 9.1 × 10–31 kg.
2. They have more penetration power than ?-particles.
3. They have less ionising power than ?-particles.
4. They affect photographic plate.

Gamma-radiations

1. They are electromagnetic waves, having wavelength less than 0.01 Å.
2. They have a very high penetration power.
3. They have a very low ionising power.
4. They are not affected by electric or magnetic fields.

Notes on Ionising power If one unit is ionising power of ?-radiations, then 100 units is ionising power of ?-particles and 10000 units is the ionising power of ?-particles. Notes on Penetration power ?-radiations can penetrate even 30 cm of iron. ?-particles can penetrate 1mm of lead or 5 mm of aluminium. ?-particles can penetrate 2.7 to 8.6 cm of air

10.From the point of view of evolution of living organisms, which of the following set of animals is a correct sequence of evolution?

[A] Whale, Kangaroo, Echidna
[B] Echidna, Whale, Kangaroo
[C] Kangaroo, Whale, Echidna
[D] Echidna, Kangaroo, Whale

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Correct Answer: D [ Echidna, Kangaroo, Whale]

Notes:
The correct sequence of the evolution would be Monotremes, Marsupials and Eutheria. Since, Whale is in subclass Eutheria, it is the latest in the evolution. So the correct sequence is Echidena (Monotreme), Kangaroo (Marsupials) & Whale (Eutheria).Echidna  are the only surviving members of the Monotremata order and are the only living mammals that lay eggs.