Science and Technology questions and solution of Civil services pre 2020

Science And Technology Questions And Solution Of Civil Services Pre 2020

With reference to carbon nanotubes, consider the following statements:

1. They can be used as carriers of drugs and antigens in the human body.
2. They can be made into artificial blood capillaries for an injured part of the human body.
3. They can be used in biochemical sensors.
4. Carbon nanotubes are biodegradable.
   Which of the statements given above are correct?
   a) 1 and 2 only
   b) 2,3 and 4 only
   c) 1,3 and 4 only
   d) 1,2,3 and 4

Answer: D) 1,2,3 and 4

Consider the following activities

1. Spraying pesticides on a crop field
2. Inspecting the craters of active volcanoes
3. Collecting breath samples from spouting whales for DNA analysis
   At the present level of technology, which of the above activities can be successfully carried out by using drones?
   a) 1 and 2 only
   b) 2 and 3 only
   c) 1 and 3 only
   d) 1, 2 and 3

Answer D) 1, 2 and 3

The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long with lasers shining between the craft. The experiment in question refers to
a) Voyager- 2
b) New Horizons
c) LISA Pathfinder
d) Evolved LISA

Answer d) : Evolved LISA

Consider the following statements:

1. Genetic changes can be introduced in the cells that produce eggs or sperms of a prospective parent
2. A person’s genome can be edited before birth at the early embryonic stage.
3. Human induced pluripotent stem cells can be injected into the embryo of a pig.
   Which of the statements given above is/are correct?
   a) 1 only
   b) 2 and 3 only
   c) 2 only
   d) 1, 2 and 3

Answer D) 1, 2 and 3

What is the importance of using Pneumococcal Conjugate Vaccines in India?

1. These vaccines are effective against pneumonia as well as meningitis and sepsis.
2. Dependence on antibiotics that are not effective against drug-resistant bacteria can be reduced.
3. These vaccines have no side effects and cause no allergic reactions.
   Select the correct answers using the code given below:
   a) 1 only
   b) 1 and 2 only
   c) 3 only
   d) 1, 2 and 3

Answer B) 1 and 2 Only

In India, the term “Public Key Infrastructure”
a) Digital security infrastructure
b) Food security infrastructure
c) Health care and education infrastructure
d) Telecommunication and transportation infrastructure

Answer. a

Which of the following statements are correct regarding the general difference between plant and animal cells?

1. Plant cells have cellulose cell walls whilst animal cells do not
2. Plant cells do not have plasma membrane unlike animal cells which do
3. Mature plant cell has one large vacuole whilst animal cell has many small vacuoles.
   Select the correct answers using the code given below
   a) 1 and 2 only
   b) 2 and 3 only
   c) 1 and 3 only
   d) 1, 2 and 3

Answer. c
Both animal and plant cells have mitochondria, but only plant cells have chloroplasts. Plants don’t get their sugar from eating food, so they need to make sugar from sunlight. This process (photosynthesis) takes place in the chloroplast. Once the sugar is made, it is then broken down by the mitochondria to make energy for the cell. Because animals get sugar from the food they eat, they do not need chloroplasts: just mitochondria.
• Both plant and animal cells have vacuoles. A plant cell contains a large, singular vacuole that is used for storage and maintaining the shape of the cell. In contrast, animal cells have many, smaller vacuoles.3 is correct.
• Plant cells have a cell wall, as well as a cell membrane. In plants, the cell wall surrounds the cell membrane. This gives the plant cell its unique rectangular shape. Animal cells simply have a cell membrane, but no cell wall. 1 is correct.
• Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not. 2 is incorrect.

Which of the following are the reasons/factors for exposure to benzene pollution?

1. Automobile exhaust
2. Tobacco smoke
3. Wood burning
4. Using varnished wooden furniture
5. Using products made of polyurethane
   Select the correct answer using the code given below:
   a) 1, 2 and 3 only
   b) 2 and 4
   c) 1, 3 and 4
   d) 1, 2,3, 4 and 5

Answer. d

In the context of recent advances in human reproductive technology, “Pronuclear Transfer is used for
a) fertilization of egg in vitro by the donor sperm
b) genetic modification of sperm producing cells
c) development of stem cells into functional embryos
d) prevention of mitochondrial diseases in offspring

Answer d

With the present state of development Artificial Intelligence can effectively do which of the following?

Also refer :

• Download the pdf of Important MCQs From the History Of Ancient India
• List Of Important Inscriptions In India
• Geography Study Materials : click here.