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. What are the products of the reaction when metal carbonate reacts with an acid?
[A] Salt and Hydrogen
[B] Carbon dioxide
[C] Salt, Carbon dioxide and water
[D] Salt, Carbon dioxide and Hydrogen
Show Answer
Correct Answer: C [Salt, Carbon dioxide and water]
Notes:
All metal carbonates and hydrogen carbonates react with acids to give a corresponding salt, carbon dioxide and water. Limestone, chalk and marble are different forms of calcium carbonate.
2. Which of the following antiseptic compounds is present in Dettol?
[A] Iodine
[B] Cresol
[C] Chloroxylenol
[D] Biothional
Show Answer
Correct Answer: C [ Chloroxylenol ]
Notes:
Chloroxylenol, also known as para-chloro-meta-xylenol, is an antiseptic and disinfectant which is used for skin disinfection and cleaning surgical instruments. It is also used within a number of household disinfectants and wound cleaners.
3. Identify the process from the options below, which is a physical change?
[A] Oxidation
[B] Reduction
[C] Sublimation
[D] Decomposition
Show Answer
Correct Answer: C [Sublimation]
Notes:
Sublimation describes a phase transition where a substance changes from a solid directly to a gas, bypassing the liquid state. This physical transformation is distinct from chemical changes like oxidation or reduction. Sublimation happens under certain combinations of pressure and temperature. Examples include dry ice (solid CO2), which sublimates at room temperature, and solid water, or ice, which sublimates under low pressure conditions.
4. The suicidal bags of the cell are
____:
[A] Ribosomes
[B] Lysosomes
[C] Phagosomes
[D] Dictyosomes
Show Answer
Correct Answer: B [Lysosomes]
Notes:
Lysosomes are called the suicide bags of the cells they contain digestive enzymes, and break down food, cellular debris and foreign invaders like bacteria. When the cell is injured beyond repair, or becomes old, the lysosome digests the cell. So, it is called “suicide bag of the cell.”
5. In coriander, the useful parts are
____:
[A] Leaves & flowers
[B] Flowers & dried fruits
[C] Roots & leaves
[D] Leaves & dried fruits
Show Answer
Correct Answer: D [Leaves & dried fruits]
Notes:
Coriander (Coriandrum sativum), also known as cilantro, Chinese parsley or dhania, is an annual herb in the family Apiaceae. All parts of the plant are edible, but the fresh leaves and the dried seeds are the parts most traditionally used in cooking.
6. The vitamin which is very labile and easily destroyed during cooking as well as storage is vitamin ____:
[A] Vitamin D
[B] Vitamin C
[C] Vitamin K
[D] Vitamin B6
Show Answer
Correct Answer: B [Vitamin C]
Notes:
Vitamin C is quite unstable when cooked or stored improperly. It is very liable and easily destroyed during cooking as well as storage. It is a water-soluble and temperature-sensitive vitamin, so is easily degraded during cooking, and elevated temperatures and long cooking times have been found to cause particularly severe losses of vitamin C.
7. In the context of agriculture, the term barani refers to ____:
[A] Rain-fed farming
[B] Irrigated farming
[C] Mixed farming
[D] Dry farming
Show Answer
Correct Answer: A [Rain-fed farming]
Notes:
Barani area are traditionally rain-fed areas. These are any low rain area where the rain-fed dry farming is practiced. Bagar tract, the dry sandy tract of land on the border of Rajasthan state adjoining the states of Haryana and Punjab, is an example of Barani land.
8. Which of the following plant hormones are incorrectly paired?
[A] Cytokinins- senescence
[B] Abscisic acid- transpiration
[C] Auxins- apical dominance
[D] Gibberlins- bud and seed dormancy
Show Answer
Correct Answer: B [Abscisic acid- transpiration]
Notes:
Abscisic acid also called plant stress hormone is responsible for responsible for dormancy of various types. It maintains dormancy in seeds and buds, stimulates the closing of stomata. Gibberellins are responsible for cell division and growth in cell size.
9. Which of the following micro-organism causes diseases like polio and chicken pox?
[A] Protozoa
[B] Bacteria
[C] Virus
[D] Algae
Show Answer
Correct Answer: C [Virus]
Notes:
Both polio and chicken pox are caused by virus. Poliomyelitis, often called polio or infantile paralysis, is an infectious disease caused by the poliovirus; while, Chickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus (VZV).
10. The duration 19-21 days refers to ___:
[A] The period of menstrual cycle soon after menstruation, during which fertilisation is most likely to occur
[B] Incubation period of hens egg
[C] Average life-span of a red blood cell in humans
[D] Period of completion of one schizogony cycle of malarial parasite inside a red blood cell
Show Answer
Correct Answer: A [The period of menstrual cycle soon after menstruation, during which fertilisation is most likely to occur]
Notes:
In menstrual cycle 19-21 days stands for the fertilizing period also called danger period. After ovulation on 14th day chances of contraption are at their highest with well developed endometrium for implantation. This is the time in the menstrual cycle when progesterone should be at its peak for the month and when estrogen should be at the height of its luteal plateau.
