Prelims Daily MCQs - Science and Technology (28 April)

1. With reference to 5G technology, consider the following statements?

  1. It works in all three bands viz low, medium and high frequency spectrum.
  2. The millimeter wave band proposed to be introduced in auction is against ITU norms.

Which of the statement(s) given above is/are correct?

a) 1 only

b) 2 only

c) Both 1 and 2

d) Neither 1 nor 2

Ans: c

Exp: Statement 1 is correct: 5G technology works in all three low, medium and high frequency spectrum bands. It is a next generation technology after 4G LTE networks.

Statement 2 is correct: The millimeter wave band proposed to be introduced in auction is against ITU norms. Satcom Industry Association-India urged regulators to limit inclusion of this band because they are preserved for satellite-based broadband services.

2. Artemis 2024 is a mission by _____________ to study impact of solar radiation on the  _____________.

a)  European Space Agency, Mars.

b) NASA, Mars.

c) NASA, Moon.

d) European Space Agency, Moon.

Ans- c.

Exp: Artemis is a mission by National Aeronautics and Space Administration which will return astronauts to the Moon. It is an abbreviation for Acceleration, Reconnection, Turbulence and Electrodynamics of Moon’s Interaction with the Sun. It will measure the impact of the Sun's radiation on a rocky moon which has no magnetic field to protect it.

3. Consider the following statements regarding Gaganyaan programme.

  1. After launching Gaganyaan Space Mission, India will join USA, Russia and China as the countries who have launched a human spaceflight mission.
  2. It involves sending a two membered crew for 5 to 7 days.
  3. It involves demonstration of human spaceflight in the Low Earth Orbit.

Which of the options below is correct?

a) 3 only

b) 1 and 2 only

c) 1 and 3 only

d) 2 and 3 only

Ans: c

Exp: Statement 1 is correct. "Gaganyaan" is India's first human space mission to be launched in 2023. This will make India the fourth nation to launch a human spaceflight mission after the USA, Russia and China.

Statement 2 is correct. The mission aims to send a three membered crew for 5 to 7 days. It involves three flights of which two are unmanned and one is manned.

Statement 3 is correct. It strives to demonstrate human spaceflight in the Low Earth Orbit for short-term and a sustained Indian human space exploration in the long-run. Indian Space Research Organization conducted a test of the cryogenic engine for 720 seconds at the ISRO Propulsion Complex in Tamil Nadu's Mahendragiri.

4. ‘TESE’, ‘GIFT’ and ‘MESA’ are the technologies related to which of the following?

a) Neutrino Detection

b) Machine Learning

c) Assisted Reproduction Technology

d) Blockchain Technology

Ans: c

Exp: Assisted Reproductive Technologies are a set of different ways to achieve pregnancy by keeping sperm or oocyte outside the human body followed by transfer of gamete or embryo in the reproductive tract of a woman. There are some technologies in ART services like Testicular Sperm Extraction (TESE), Gamete Intrafallopian Transfer (GIFT), Microsurgical Epididymal Sperm Aspiration (MESA), ovarian stimulation, Intrauterine Insemination (IUI), Zygote Intrafallopian Transfer (ZIFT), Intracytoplasmic Sperm Injection (ICSI) etc.

5. Consider the following statements regarding Bio-computers.

  1. Bio-computers will be created by combining 3D cultures of brain tissue with modern computing methods.
  2. These brain organoids can also be developed using stem cells from individuals having cognitive disorders.

Which of the statements given above is/are correct?

a) 1 only

b) 2 only

c) Both 1 and 2

d) Neither 1 nor 2

Ans: c

Exp: Brain organoids are 3D cultures of brain tissue developed in the lab. These cultures are used to study development of the human brain and test drug response. When these brain organoids are combined with modern computing methods, it leads to creation of bio computers.

Using stem cells from people with neurodegenerative or cognitive disorders can also help develop brain organoids. This can be used to compare brain structure data between ‘healthy’ and ‘patient-derived’ organoids to show the biological basis of human learning, cognition and memory.

6. The present ages of three persons are in the ratio 4:7:9. Eight years ago, the sum of their ages was 56. Find their present of oldest person (age in years)?

a) 34

b) 36

c) 38

d) 40

Ans: b

Exp: Let the ages of three persons be 4x, 7x and 9x respectively. Eight years ago, their ages were (4x-8), (7x-8) and (9x-8).

The sum of their ages eight years ago = 4x – 8 + 7x – 8 + 9x - 8 = 20x – 24 = 56.

20x = 80

x =4

Therefore, their respective ages are 16, 28 and 36 years.

Age of oldest person is 36 years.

7. Two numbers are selected at random from the integers 1 through 9. If the sum is even, find the probability that both numbers are odd.

a) ½

b) ¼

c) ⅜

d) ⅝

Ans: d

Exp: The sum of two odd numbers or two even numbers is always even.

There are 5 odd and 4 even numbers.

The combination among odd numbers will be 5C2

And the combination among even numbers will be 4C2

Probability =  5C2 / (5C2+4C2)

=  10/(10+6)

= 10/16

= 5/8

Cover the entire CSAT syllabus in 70 hours.

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