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 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.
2. After whom is the chemical element with atomic number 102 named?
[A] Charles Darwin
[B] Albert Einstein
[C] Alfred Bernhard Nobel
[D] Isaac Newton
Show Answer
Correct Answer: C [Alfred Bernhard Nobel]
Notes:
Alfred Bernhard Nobel was a Swedish chemist, engineer, inventor, businessman, and philanthropist. Atomic number 102 was named after him.
3. 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.
4. 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.
5. Which gas is major contributor to greenhouse effect?
[A] Chloroflurocarbon
[B] Nitrogen dioxide
[C] Sulphur dioxide
[D] Carbon dioxide
Show Answer
Correct Answer: D [Carbon dioxide]
Notes:
Greenhouse gases that occur both naturally and from human activities include water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ozone (O3). These gases contribute to atmospheric warming when they absorb infrared radiation emitted by the solar-warmed Earth and transfer their extra energy to the surrounding atmospheric gases.
6. The wing of a bat and the wing of a bird are the examples of ____ limbs:
[A] Heterogeneous
[B] Homogenous
[C] Homologous
[D] Analogous
Show Answer
Correct Answer: D [Analogous]
Notes:
The wings of insects, bats and birds, that evolved independently in each lineage separately after diverging from an ancestor without wings, are examples of analogous organs. Analogous organs are the opposite of homologous organs, which have similar functions but different origins.
7. Which of the following diseases has been eradicated worldwide?
[A] Smallpox
[B] Plague
[C] Chickenpox
[D] Dracunculiasis
Show Answer
Correct Answer: A [Smallpox]
Notes:
Smallpox was one of the world’s most devastating diseases known to humanity. The last known natural case was in Somalia in 1977. It was declared eradicated in 1980 following a global immunization campaign led by the World Health Organization. Smallpox is caused by infection with the variola virus.
8. Consider the following statements about how plants absorb nitrogen:
- Plants absorb nitrogen in the form of inorganic nitrates or nitrites.
- Plants take in nitrogen in the form of organic compounds.
- Nitrogen is directly taken up by the plants from the atmosphere.
Which of the above statements is / are correct?
[A] Only 1 and 2
[B] Only 1 and 3
[C] Only 2 and 3
[D] All of these
Show Answer
Correct Answer: A [Only 1 and 2]
Notes:
Plants obtain nitrogen through their roots. In the soil, nitrifying bacteria change ammonia into nitrite (NO2 –) and then into nitrate (NO3 –), this process is known as nitrification. Furthermore, plants also absorb nitrogen in an organic form. Several organic compounds (compounds containing carbon) constitute the organic fraction of nitrogen in the soil. The organic matter in the soil exists as decomposing plant and animal residues, relatively stable decomposition-resistant compounds, and humus. The abundance of various forms of nitrogen can be altered by plant roots through the change in pH and secretion of organic compounds or oxygen.
9. The release of which of the following into ponds and wells helps in controlling mosquitoes?
[A] Snail
[B] Crab
[C] Dogfish
[D] Gambusia fish
Show Answer
Correct Answer: D [Gambusia fish]
Notes:
The Gambusia fish, also known as larvivorous stagnant water fish. It feeds on the larvae of mosquitoes. So it helps in controlling their population. It is also called ‘mosquito fish’ and is being used as a biological control measure. Hence, a check on malaria and other vector borne diseases like even dengue.
10. The edible part of an onion is ____:
[A] Fleshy leaves
[B] Aerial stem
[C] Modified root
[D] Aerial flower
Show Answer
Correct Answer: A [Fleshy leaves]
Notes:
The edible portion in an onion is swollen leaves with a bit of stem. They are bulbs which, like garlic and leeks, are modified stems in which the primary storage tissue is expanded leaf bases. They come in white, yellow, and red varieties. The swollen leaves have sugar as stored food in them.