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. Maximum number of animals species belong to which among the following groups?
[A] Mammalia
[B] Aves
[C] Pisces
[D] Arthropoda
Show Answer
Correct Answer: D [Arthropoda]
Notes:Arthropoda is the largest phylum of animal kingdom because around 2/3rd of all the named species on Earth belong to this phylum.
Ants, mosquitoes, flies, cockroaches, shrimp, crabs, spiders, scorpions etc. are examples of arthropods. There are three main classes of arthropods as follows:
- Insects: This includes mosquitoes, cockroaches, ants, flies, bees, moths, grasshoppers, beetles and butterflies
- Crustaceans: This includes crabs, lobsters, shrimp and barnacles
- Arachnids: This includes scorpions, spiders and mites
Further, a few other classes are onychophorans (velvet worms), diplopods (millipedes) and chilopods (centipedes).
2. Which among the following blood protein regulates the amount of water in plasma?
[A] Globulin
[B] Albumin
[C] Fibrin
[D] Fibulin
Show Answer
Correct Answer: B [Albumin]
Notes:
Albumin is an energy storage protein and also an important osmoregulator of blood.
3. Artificial Kidney or blood dailyzer which is used in renal failure or Kidney disorders works on the principles of _________?
[A] Imbibition & Osmosis
[B] Plasmolysis & Osmosis
[C] Diffusion & osmosis
[D] Diffusion only
Show Answer
Correct Answer: C [Diffusion & osmosis]
Notes:
Hemodialysis is a procedure where a dialysis machine and a special filter called an artificial kidney, or a dialyzer, are used to clean your blood. It works on the principles of Diffusion & osmosis.
4. Which among the following controls the protein synthesis and heredity ?
[A] Amino acids
[B] Genes
[C] DNA
[D] RNA
Show Answer
Correct Answer: B [Genes]
Notes:
Genes controls the protein synthesis and heredity. It is the basic physical and functional unit of heredity and are made up of DNA. Some genes act as instructions to make molecules called proteins.
5. Apart from the temporal bone, which among the following is considered as strongest bone in human body?
[A] Humerus
[B] Fibula
[C] Femur
[D] Tibia
Show Answer
Correct Answer: C [Femur]
Notes:
Apart from the temporal bone, femur is considered as strongest bone in human body. It is the only bone located within the human thigh. It is both the longest and the strongest bone in the human body. It extends from the hip to the knee.
6. The colors in the fine cut diamond are because of which among the following?
[A] Variance in transparency of diamond
[B] Variance in index of refraction
[C] Presence of Impurities
[D] Existence of definite planer layers
Show Answer
Correct Answer: C [Presence of Impurities]
Notes:
Pure diamond should transmit visible light and appear as a clear colorless crystal. Colors in diamond originate from lattice defects and impurities. The diamond crystal lattice is exceptionally strong and only atoms of nitrogen, boron and hydrogen can be introduced into diamond during the growth at significant concentrations (up to atomic percents). Nitrogen gives yellowish color while the Boron gives bluish color.
7. Power of lens is measured in which of the following units?
[A] metre
[B] dioptre
[C] lumen
[D] watt
Show Answer
Correct Answer: B [ dioptre ]
Notes:
Power of lens is measured in dioptre(D). Power of lens = 1/focal length The power of a lens is its ability to bend light. The greater the power the greater the refraction of light.
8. Which of the following is NOT an example of conservation of mechanical energy?
[A] Vibrations of a simple pendulum
[B] Motion of a small spherical ball over a watch glass
[C] Vibrations of an elastic spring
[D] None of the above
Show Answer
Correct Answer: D [None of the above]
Notes:Some examples of conservation of mechanical energy:
- Vibrations of a simple pendulum
- Motion of a small spherical ball over a watch glass
- Vibrations of an elastic spring
9. Water does not fall out of a glass when it is inverted inside a satellite, which is orbiting very close to the earth’s surface. Which of the following is the best reason for this?
[A] The earth does not exert any force on the water
[B] The earth’s force of attraction on the water is exactly balanced by the force created by the satellites
[C] The water and the glass have the same acceleration due to gravity
[D] The gravitational attraction between the glass and the water balances the earth’s attraction on the
Show Answer
Correct Answer: C [The water and the glass have the same acceleration due to gravity]
Notes:
Water does not fall out of a glass when it is inverted inside a satellite, which is orbiting very close to the earth’s surface. The reason for this is that the water and the glass have the same acceleration due to gravity, equal to g, towards the centre of the earth. Hence there is no relative motion between them.
10. In which of the following positions is the potential energy minimum in S.H.M?
[A] Extreme position
[B] Mean position
[C] can be at extreme or mean position
[D] None of the above
Show Answer
Correct Answer: B [Mean position]
Notes:
Potential energy maximum and equal to total energy at extreme positions. Potential energy is minimum at mean position.
