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 percentage of carbon is present in steel?
[A] 0.0 to 2.5
[B] 2.5 to 5.0
[C] 5.0 to 7.5
[D] 7.5 to 10.0
Show Answer
Correct Answer: A [0.0 to 2.5 ]
Notes:
Steel is an alloy made by combining iron and other elements, the most common of these being carbon. When carbon is used, its content in the steel is between 0.2% and 2. 1% by weight, depending on the grade. Other alloying elements sometimes used are manganese, chromium, vanadium and tungsten. Carbon and other elements act as a hardening agent, preventing dislocations in the iron atom crystal lattice from sliding past one another.
2. Chromosome designation of Turner sydrome is ____:
[A] 44A+XO
[B] 44A+XXX
[C] 44A+XXY
[D] 44A+XYY
Show Answer
Correct Answer: A [44A+XO]
Notes:
Turner syndrome is a rare chromosomal disorder characterized by partial or complete loss (monosomy) of one of the X chromosomes that affects females. Individuals with Turner syndrome have only 45 chromosomes, including just a single X chromosome. This monosomic has a chromosome complement of 44 autosomes and one X chromosome (44+XO). The abnormal condition probably originates from exceptional egg or sperm with no X chromosome.
3. In winter, at the time of hibernation, Toads maintain breathing through ____:
[A] Lungs
[B] Skin
[C] Both by Skin and Lungs
[D] Buccal cavity
Show Answer
Correct Answer: B [Skin]
Notes:
During hibernation in winter, toads or frogs spend the time tucked away deep in the soil, in the mud underwater or hidden amidst foliage or rotting plants. Outside of times of hibernation, they usually take in oxygen via the air, employing their lungs. However, during hibernation, they receive their necessary oxygen through their permeable skin. This is referred to as cutaneous gas exchange.
4. What accumulates in the muscles after continuous strenuous physical exercise as a result of temporary anaerobic respiration that causes muscular fatigue?
[A] ATP
[B] Lactic acid
[C] Ethyl alcohol
[D] Carbon dioxide
Show Answer
Correct Answer: B [Lactic acid]
Notes:
Anaerobic reactions involve break down of glucose into pyruvic acid, which then reacts to produce lactic acid. As muscle metabolism shifts from aerobic to anaerobic ATP production, lactic acid begins to accumulate in muscles and to appear in the bloodstream. This leads to muscle fatigue with changing pH of muscle cells. C6H12O6 —> 2C3H6O3 + 2ATP
5. To keep warm, polar bears have a layer of ____ under their skin:
[A] Muscle
[B] Hair
[C] Fat
[D] Cartilage
Show Answer
Correct Answer: C [Fat]
Notes:
Polar bears are supremely adapted to their environment – they have a number of traits that help them to cope with snow, ice, and below-freezing temperatures. They have a layer of fat that can be four inches (10 cm) thick. Although their fur is the primary source of insulation, the fat helps keep heat in as well.
6. Motor skills are associated with which part of the brain?
[A] Parietal Lobe
[B] Occipital Lobe
[C] Frontal lobe
[D] Temporal lobe
Show Answer
Correct Answer: C [Frontal lobe]
Notes:
Motor skills are needed to control the movements of the different muscles in the human body. The frontal lobe plays a large role in voluntary movement. It houses the primary motor cortex which regulates activities like walking. The frontal lobes are also involved in problem solving, spontaneity, memory, language, initiation, judgement, impulse control, etc.
7. Yeast is a ____:
[A] Bacteria
[B] Fungi
[C] Algae
[D] Bryophyte
Show Answer
Correct Answer: B [Fungi]
Notes:
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans. Commercially they are widely used in production of alcohol and carbon dioxide. Hence, they are known to lay foundation of bakery and brewery industries.
8. Night blindness results from the deficiency of ___:
[A] Vitamin-E
[B] Vitamin-A
[C] Vitamin-B2
[D] Glucose
Show Answer
Correct Answer: B [Vitamin-A]
Notes:
Cause of night blindness is a deficiency of retinol, or vitamin A, found in fish oils, liver, dairy products, vegetable and fruits yellow in colour. Nyctalopia also called “Night Blindness” is a condition making it difficult or impossible to see in relatively dim light. To over come deficiency of vitamin-A, one needs to feed of food products rich in carotene which is used in synthesis of vitamin-A is liver.
9. Blood groups were discovered by
____:
[A] Altmann
[B] Landsteiner
[C] Losch
[D] Ronald Ross
Show Answer
Correct Answer: B [Landsteiner]
Notes:
Karl Landsteiner was an Austrian biologist and physician. He is noted for having first distinguished the main blood groups in 1900, having developed the modern system of classification of blood groups from his identification of the presence of agglutinins in the blood, and having identified, with Alexander S. Wiener, the Rhesus factor, in 1937, thus enabling physicians to transfuse blood without endangering the patient’s life.
10. In how many parts is the human brain divided?
[A] 2
[B] 3
[C] 4
[D] 5
Show Answer
Correct Answer: B [3]
Notes:
The human brain is divided into three parts : The brainstem which has the pons, the midbrain, and the medulla oblongata. The cerebellum which forms the hindbrain along with the brainstem and is located below the cerebrum. The cerebrum which is the largest section of the brain, is divided into two hemispheres (the left and the right) each of which has four lobes: the frontal, the temporal, the parietal, and the occipital.
