APSC CCE Prelim 2020 General Studies (GS) Paper 1 Questions Analysis
Questions from Science & Technology sections
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Q31. Which ministry is carrying special scientific schemes like KIRAN IPR and Vigyan Jyoti for women scientists of India?
- The Ministry of Women and Child Development
- The Ministry of Science and Technology
- The Ministry of Human Resource Development
- The Ministry of Skill Development and Entrepreneurship
Correct option: (B) Ministry of Science and Technology
DST support empowering women scientists | Department Of Science & Technology
Q43. Wooden Doors often swell up and get stuck during rainy season. This is due to the phenomenon of
- Endosmosis
- Imbibition
- Endocytosis
- Capillarity
Correct option: (B) Imbibition
The swelling of wooden doors is caused by the process of imbibition. Imbibition is the absorption of water by solid particles of a substance without forming a solution.
Q44. Who won the Nobel Prize in Physics for the discovery of the law of photoelectric effect?
- Wilhelm Roentgen
- Albert Einstein
- Issac Newton
- Ernest Rutherford
Correct option: (B) Albert Einstein
The Nobel Prize in Physics 1921 was awarded to Albert Einstein “for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect.”
Q45. The filament string of an electric bulb is made up of
- Copper
- Silver
- Platinum
- Tungsten
Correct option: (D) Tungsten
Tungsten is a metal with a high resistivity. Tungsten has a high melting point, making it ideal for light bulbs. Tungsten is used to make the filament of an electric bulb because it has the highest melting point, lowest vapour pressure, and greatest tensile strength of any metal.
Q46.Which of the following is the chief constituent of biogas?
- Carbon Dioxide
- Hydrogen
- Ethane
- Methane
Correct option: (D) Methane
Typical composition of biogas
|
Percentage by volume |
||
|
Methane |
CH4 |
50–75 |
|
Carbon dioxide |
CO2 |
25–50 |
|
Nitrogen |
N2 |
0–10 |
|
Hydrogen |
H2 |
0–1 |
|
Hydrogen sulfide |
H2S |
0.1 –0.5 |
|
Oxygen |
O2 |
0–0.5 |
Q47. Which of the following is an egg laying mammal?
- Platypus
- Bat
- Whale
- Seal
Correct option: (A) Platypus
The Extant Species of Egg-laying Mammals Are:
- The Duck-Billed Platypus. Ornithorhynchus anatinus is a bizarre-looking animal that’s found in streams with banks suitable for burrowing. They are sleek and brown, with a beaver-like flat tail. Their face has a large, duck-like bill. The males have venomous spurs on their rear ankles. This species eats bottom-dwelling invertebrates such as crabs. They live in eastern Australia, including Tasmania.
- The Short-Beaked Echidna. Tachyglossus aculeatus is a widespread animal that’s found across Australia and into New Guinea. They are spikey and have powerful front limbs made for burrowing. These echidnas eat insects and hibernate through the winter.
- The Eastern Long-Beaked Echidna. Zaglossus bartoni eats almost exclusively earthworms. They are also spined. They live in humid forests, especially above sea level, in New Guinea. There are four subspecies of eastern long-beaked echidna, primarily separated by geographic area.
- Sir David’s Long-Beaked Echidna. Zaglossus attenboroughi lives in the Cyclops mountains of New Guinea. These are the smallest of the Zaglossus genus. It is feared that this species is highly endangered or even extinct, as a specimen has not been collected since 1961. Interviews with locals in 2007 (and signs of digging) suggest that the species is still alive – but no scientists have seen one yet.
- Western Long-Beaked Echidna. Zaglossus bruijni is the largest extant monotreme, tipping the scales at 5 to 10kg. They prefer to live in alpine meadows and montane forests. They are considered critically endangered. They live in New Guinea.
Q48. Which of the following diseases is not caused by a virus?
- Influenza
- Anthrax
- AIDS
- Dengue
Correct option: (B) Anthrax
Anthrax is a serious infectious disease caused by gram-positive, rod-shaped bacteria known as Bacillus anthracis.
Q49. A washing machine works on the principle of
- Gravitation
- Acceleration
- Centrifugation
- Linear Motion
Correct option: (C) Centrifugation
The working principle of a washing machine is centrifugation. Centrifugation is a separation process which uses the action of centrifugal force to promote accelerated settling of particles in a solid-liquid mixture. The washing machine consists of centrifuge for this purpose.
Q50. Raindrops are spherical in shape because of
- Viscosity
- Velocity
- Residual Pressure
- Surface tension
Correct option: (D) Surface tension
Raindrops start to form in a roughly spherical structure due to the surface tension of water. On smaller raindrops, the surface tension is stronger than in larger drops. The reason is the flow of air around the drop. As the raindrop falls, it loses that rounded shape.
Q51. Name the clinical procedure in which blood is transfused from recovered COVID-19 patient to a COVID-19 affected patient in critical condition.
- Dialysis therapy
- Plasma therapy
- Solidarity technique
- Hydroxychloroquine administration
Correct option: (B) Plasma therapy
Convalescent plasma therapy uses blood from people who’ve recovered from an illness to help others recover. The U.S. Food and Drug Administration (FDA) has given emergency authorization for convalescent plasma therapy with high antibody levels to treat COVID-19.
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Q52. A man suddenly encounters a tiger in the jungle, and his heartbeat goes up, blood pressure increases and gets nervous. Which hormone is released more at this point in his body?
- Thyroxine
- Insulin
- Adrenaline
- Aldosterone
Correct option: (C) Adrenaline
Adrenaline is also known as the “fight-or-flight hormone.” It’s released in response to a stressful, exciting, dangerous, or threatening situation. Adrenaline helps your body react more quickly. It makes the heart beat faster, increases blood flow to the brain and muscles, and stimulates the body to make sugar to use for fuel.