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. 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.
2. 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.
3. Which of the following statement is incorrect?
[A] Each sperm is a single cell
[B] Oviparous animal does not give birth to young ones
[C] External fertilisation takes place in frog
[D] Fertilisation is necessary even in asexual reproduction
Show Answer
Correct Answer: D [Fertilisation is necessary even in asexual reproduction]
Notes:
While fertilization is necessary for organisms that reproduce sexually, individuals that reproduce asexually?do so without the need for fertilization. These organisms produce genetically identical copies of themselves through?binary fission, budding, fragmentation, parthenogenesis, or other forms of asexual reproduction.
4. 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.
5. Silk worms feed on
____:
[A] Basil leaves
[B] Mulberry leaves
[C] Curry leaves
[D] Rose leaves
Show Answer
Correct Answer: B [Mulberry leaves]
Notes:
Silk worms are the larva of a moth (Bombyx mori) native to Asia that spins a cocoon of fine, strong, lustrous fiber that is the source of commercial silk. Silkworms feed on the leaves of the mulberries (genus- Morus) and sometimes on the Osage orange (Maclura pomifera).
6. The largest cells in mammalian blood are ____:
[A] Monocytes
[B] Lymphocytes
[C] Erythrocytes
[D] Basophils
Show Answer
Correct Answer: A [Monocytes]
Notes:
Various components of blood are: Plasma, Erythrocytes (Red Blood Cells), Leucocytes (White Blood Cells) and Thrombocytes/Platelets. Monocytes, also known as macrophages, are the largest blood cells in most mammals, measuring 10-15 cm in diameter. They are leucocytes. Their nuclei are kidney-shaped and cytoplasm is abundant.
7. During photosynthesis, green plants use energy from sunlight to synthesize ___ from carbon dioxide and water:
[A] Fructose
[B] Glucose
[C] Sucrose
[D] Galactose
Show Answer
Correct Answer: B [Glucose]
Notes:
Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water. This glucose can be converted into pyruvate which releases adenosine triphosphate (ATP) by cellular respiration. Oxy-gen is released through the stomata on the underside of the leaf; glucose is transported around the plant in the phloem vessels.
8. The radioactive Strontium-90 causes _____:
[A] Lung cancer
[B] Skin cancer
[C] Bone cancer
[D] Brain cancer
Show Answer
Correct Answer: B [Skin cancer]
Notes:
Strontium-90 is a radioactive isotope of strontium produced by nuclear fission. Used mostly in weapons and nuclear power plants, poisoning usually occurs through accidental ingestion. Studies have also linked strontium-90 to various forms of skin cancer.
9. Muscle fatigue occurs due to accumulation of ____:
[A] Carbonic Acid
[B] Lactic Acid
[C] ATP
[D] ADP
Show Answer
Correct Answer: B [Lactic Acid]
Notes:
Muscle fatigue refers to the decline in muscle force generated over time. Several factors contribute to muscle fatigue, the most important being lactic acid accumulation. Lactic acid is formed and accumulated in the muscle under conditions of high energy demand, rapid fluctuations of the energy requirement and insufficient supply of O2.
10. 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.
