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 iron ore contains the highest percentage of iron content?
[A] Hematite
[B] Siderite
[C] Magnetite
[D] Limonite
Show Answer
Correct Answer: C [Magnetite]
Notes:
Magnetite (Fe3O4) typically contains about 70% iron by weight. It is black in color and strongly magnetic. Hematite (Fe2O3) contains about 60–70% iron. Limonite contains 35–50% iron. Siderite (FeCO3) contains about 48% iron. Magnetite is widely mined due to its high iron concentration compared to other ores.
2. Which among the following is known as White Vitriol?
[A] Zinc Sulphate
[B] Zinc Chloride
[C] Zinc Phosphate
[D] Zinc oxide
Show Answer
Correct Answer: A [Zinc Sulphate]
Notes:
Zinc sulfate is the inorganic compound with the formula ZnSO4 and historically known as “white vitriol” Zinc sulfate is an inorganic compound and dietary supplement.
3. Jhum cultivation refers to ____:
[A] Terrace farming
[B] Jamun cultivation
[C] Step farming
[D] Shifting agriculture
Show Answer
Correct Answer: D [Shifting agriculture
]
Notes:
Jhum is a traditional form of shifting cultivation that is common in the North-East of India. Also known as slash and burn agriculture, it is practiced by the tribal groups in Arunachal Pradesh, Meghalaya, Mizoram and Nagaland and the hilly areas of Assam. Jhum involves clearing a piece of land by setting fire or clear felling and using the area for growing crops.
4. The part of brain which controls emotional reactions in our body is ____:
[A] Hypothalamus
[B] Meninges
[C] Cerebrum
[D] Thalamus
Show Answer
Correct Answer: A [Hypothalamus]
Notes:
The brain’s limbic system controls emotional expression through the hypothalamus, which has control over the body’s emotional responses systems. The hypothalamus is responsible for regulating hunger, thirst, response to pain, levels of pleasure, sexual satisfaction, anger and aggressive behavior, etc. It also regulates pulse, blood pressure, breathing, and arousal in response to emotional circumstances.
5. In which of the following class are the pulse producing plants kept?
[A] Liliaceae
[B] Solanaceae
[C] Malvaceae
[D] Leguminosae
Show Answer
Correct Answer: D [Leguminosae]
Notes:
Pulses are part of the legume family, but the term “pulse” refers only to the dried seed. Dried peas, edible beans, lentils and chickpeas are the most common varieties of pulses. The term “legume” refers to the plants whose fruit is enclosed in a pod. Other well-known legumes include alfalfa, clover, fresh peas, lupins, mesquite, soy and peanuts.
6. Synapse gap is present between which of the following?
[A] Two Kidneys
[B] Two neurons
[C] Brain and Spinal Cord
[D] None of the above
Show Answer
Correct Answer: B [Two neurons]
Notes:
The gap between the two neurons is called the synapse. It is a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another neuron. Synapses are essential to neuronal function : neurons are cells that are specialized to pass signals to individual target cells, and synapses are the means by which they do so.
7. In which of the following multiple epidermis is found?
[A] Boerhaavia
[B] Nerium
[C] Amaranthus
[D] Helianthus
Show Answer
Correct Answer: B [Nerium]
Notes:
It is assumed that protodermal cells divide periclinally in certain cases to form multiseriate or multiple epidermis. The multiple epidermis is found in some organs like roots of orchids (Vanda), leaves of Ficus, Nerium, Piperomia, etc. In Nerium, it is found on both surfaces.
8. 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.
9. Which of the following is an example of Ball and Socket joint in humans?
[A] Hip Joint
[B] Neck Joint
[C] Wrist Joint
[D] Finger Joint
Show Answer
Correct Answer: A [Hip Joint]
Notes:
The ball and socket joint (or spheroidal joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. One of its example is hip joint, in which a partially spherical end lies in a socket, allowing multidirectional movement and rotation.
10. Production of alcohol from organic compounds by microorganisms is known as ____:
[A] Anaerobic respiration
[B] Aerobic respiration
[C] Combustion
[D] Fermentation
Show Answer
Correct Answer: D [Fermentation]
Notes:
The process of breaking down large molecules into simpler one in the presence of enzyme is called fermentation. Alcoholic fermentation is a complex biochemical process during which yeasts convert sugars to ethanol, carbon dioxide, and other metabolic byproducts that contribute to the chemical composition and sensorial properties of the fermented foodstuffs.