Daily Static MCQs Quiz for UPSC, IAS, UPPSC/UPPCS, MPPSC. BPSC, RPSC & All State PSC Exams
Subject : Science and Technology
1. Consider the following statements regarding Superconductivity:
1. Superconductivity is a state in which a material shows
very high electrical resistance.
2. Superconducting materials can save huge amounts of energy, and be used to
make highly efficient electrical appliances.
3. Superconductivity is possible only at high temperatures.
How many of the above statements is/are correct?
(a) Only one
(b) Only two
(c) All three
(d) None
Answer: (A)
Explanation: Superconductivity is a phenomenon that, so far, has been possible only at extremely low temperatures, in the range of 100°C below zero. The search for a material that exhibits superconductivity at room temperature, or at least manageable low temperatures, has been going on for decades. Superconductivity is a state in which a material shows absolutely zero electrical resistance. While resistance is a property that restricts the flow of electricity, superconductivity allows unhindered flow. Because of zero resistance, superconducting materials can save huge amounts of energy, and be used to make highly efficient electrical appliances. Hence, only statement 2 is correct.
2. Consider the following statements regarding Darknet:
1. Darknet refers to the deep hidden internet platform that
is used for narcotics sale, exchange of pornographic content and other illegal
activities by using the secret alleys of the onion router (ToR) to stay away
from the surveillance of law enforcement agencies.
2. Owing to its end-to-end encryption, darknet is considered very tough to crack
when it comes to investigating criminal activities being rendered over it.
Which of the above statements is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Answer: (C)
Explanation: Darknet refers to the deep hidden internet platform that is used for narcotics sale, exchange of pornographic content and other illegal activities by using the secret alleys of the onion router (ToR) to stay away from the surveillance of law enforcement agencies. Owing to its end-to-end encryption, darknet is considered very tough to crack when it comes to investigating criminal activities being rendered over it.
Darknets in general may be used for various reasons, such as:
- Computer crime (cracking, file corruption, etc.)
- Protecting dissidents from political reprisal
- File sharing (warez, personal files, pornography, confidential files, illegal or counterfeit software, etc.)
- To better protect the privacy rights of citizens from targeted and mass surveillance
- Sale of restricted goods on darknet markets
- Whistleblowing and news leaks
- Purchase or sale of illicit or illegal goods or services
- Circumventing network censorship and content-filtering systems, or bypassing restrictive firewall policies
Hence, both statements are correct.
3. Consider the following statements:
1. Malaria is a viral disease transmitted by the infective
bite of Anopheles mosquito.
2. Kala-azar is caused by a protozoan parasite of genus Leishmania.
3. Dengue is transmitted by the infective bite of Aedes Aegypti mosquito.
How many of the above statements is/are correct?
(a) Only one
(b) Only two
(c) All three
(d) None
Answer: (B)
Explanation:
- Malaria is a potentially life threatening parasitic disease caused by parasites known as Plasmodium viviax (P.vivax), Plasmodium falciparum (P.falciparum), Plasmodium malariae (P.malariae) and Plasmodium ovale (P.ovale). It is transmitted by the infective bite of Anopheles mosquito. Hence, statement 1 is incorrect.
- Kala-azar is a slow progressing indigenous disease caused by a protozoan parasite of genus Leishmania.
- Dengue is a viral disease. It is transmitted by the infective bite of Aedes Aegypti mosquito. Hence, statement 2 and 3 are correct.
4. Pneumoconiosis, sometimes seen in news is related to which of the following?
(a) Tuberculosis
(b) Black lung disease
(c) High blood glucose levels
(d) High levels of fat in the blood
Answer: (B)
Explanation: Coal mine workers and communities around coal mines face many adverse diseases, prominent among them pneumoconiosis (commonly known as black lung disease) due to the inhalation of coal dust, as well as diseases due to polluted drinking water. Hence, option (b) is correct.
5. Consider the following statements:
1. The process of copying genetic information from one strand
of the DNA into RNA is termed as transcription.
2. Bacteria contain only mRNA (messenger RNA) and do not have any tRNA (transfer
RNA).
Which of the above statements is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Answer: (A)
Explanation: The process of copying genetic information from one strand of the DNA into RNA is termed as transcription. In bacteria, there are three major types of RNAs: mRNA (messenger RNA), tRNA (transfer RNA), and rRNA (ribosomal RNA). All three RNAs are needed to synthesise a protein in a cell. The mRNA provides the template, tRNA brings aminoacids and reads the genetic code, and rRNAs play structural and catalytic role during translation. There is single DNA-dependent RNA polymerase that catalyses transcription of all types of RNA in bacteria. RNA polymerase binds to promoter and initiates transcription (Initiation). Hence, statement 1 is correct.
