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. 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.
2. Hydrochloric acid is secreted by the cells lining the
____:
[A] Stomach
[B] Ileum
[C] Oral cavity
[D] Colon
Show Answer
Correct Answer: A [Stomach]
Notes:
The chief cells of the stomach secrete enzymes for protein breakdown (inactive pepsinogen and rennin). Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then helps digestion by breaking the bonds linking amino acids, a process known as proteolysis.
3. Symbiotic Bacteria responsible for the fixation of atmospheric nitrogen are present in ____:
[A] Peas
[B] Oats
[C] Corn
[D] Wheat
Show Answer
Correct Answer: A [Peas]
Notes:
Nitrogen-fixing bacteria are microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen. Rhizobium is one such bacteria that is associated with leguminous plants (e.g., various members of the pea family). It invades the root hairs of host plants and convert free nitrogen to ammonia, which the host plant utilizes for its development.
4. Water of coconut is ____:
[A] Liquid nucellus
[B] Liquid endocarp
[C] Degenerated liquid endosperm
[D] Liquid mesocarp
Show Answer
Correct Answer: C [Degenerated liquid endosperm]
Notes:
Coconut water, the clear liquid inside young green coconuts (fruits of the coconut palm), is liquid endosperm. In early development, it serves as a sus pension for the endosperm of the coconut during their nuclear phase of development. It contains sugars, vitamins, minerals, proteins, free amino acids and growth promoting factors.
5. In male sharks, Claspers are found attached to
____:
[A] Anal fin
[B] Ventral fin
[C] Pectoral fin
[D] Pelvic fin
Show Answer
Correct Answer: D [Pelvic fin]
Notes:
Claspers are organs found in male elasmobranchs. Each male has two claspers. They are located along the inner side of the shark or ray’s pelvic fin and are used in reproduction. During mating, the male deposits his sperm into the female’s cloaca (the opening that serves as the entrance to the uterus, intestine and urinary tract) via grooves that lie in the upper side of the claspers.
6. What are female gametes called as?
[A] Zygote
[B] Sperms
[C] Embryo
[D] Ova
Show Answer
Correct Answer: D [Ova]
Notes:
Female gametes are also called eggs or ova. They are created during the cellular reproduction process known as meiosis. The resulting gamete cell is a haploid cell. When the two haploid cells, the egg and sperm, fuse together during fertilization, the result is a diploid cell called a zygote.
7. Cuscuta is a ____:
[A] Complete stem parasite
[B] Partial root parasite
[C] Partial stem parasite
[D] Complete root parasite
Show Answer
Correct Answer: A [Complete stem parasite]
Notes:
Cuscuta (Dodder) is a genus of about 100-170 species of yellow, orange or red (rarely green) parasitic plants. Dodders are supremely adapted for a life of plunder and pillage. Reduced in form to scrambling and twining threads, they appear to be completely leafless, although closer inspection reveals tiny scale leaves pressed close to the stems. So, it is a stem parasite.
8. Dumb-bell shaped guard cells are present in
____:
[A] Mango
[B] Wheat
[C] Gram
[D] Groundnut
Show Answer
Correct Answer: B [Wheat]
Notes:
Monocost and dicots differ in the location of stomata and shape of guard cells. In monocots stomata are Dumb-bell shaped in dicots they are bean-shaped.
9. Which of the following diseased person can still donate eyes?
[A] AIDS patient
[B] Asthma patient
[C] Acute leukaemia patient
[D] Both Asthma and Acute leukaemia patient
Show Answer
Correct Answer: B [Asthma patient]
Notes:
Persons with AIDS, Hepatitis B and C, Rabies, Septicaemia, Acute leukemia (Blood cancer), Tetanus, Cholera, and infectious diseases like Meningitis and Encephalitis cannot donate eyes. Even people with diabetes, asthma, hypertension, or persons wearing spectacles and who had undergone cataract surgery can also donate eyes.
10. Who among the following gave Theory of Evolution?
[A] Darwin
[B] Mendel
[C] Hooke
[D] Rutherford
Show Answer
Correct Answer: A [Darwin]
Notes:
The Theory of Evolution was developed by Charles Darwin (1809-1882). It states that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual’s ability to compete, survive, and reproduce. The theory gained general scientific acceptance after Darwin published On the Origin of Species in 1859.
