[SOLUTIONS]
Q.1)Navic is a term related with
a)India’s new submarine
b)India’s own GPS system
c)India’s new aircraft carrie
d)None of the above
Ans-[B]
Explanation- The Indian Regional Navigation Satellite System or IRNSS with an operational name of NAVIC which stands for NAVigation with Indian Constellation is an Indian developed Navigation Satellite System that is used to provide accurate real-time positioning and timing services over India and region extending to 1500 km around India. The fully deployed NAVIC system consists of 3 satellites in Geostationary orbit and 4 satellites in Geosynchronous orbit, approximately 36,000 km altitude above Earth’s surface.However, the full system comprises nine satellites, including two on the ground as stand-by.
Q.2)SOFIA is a program which is currently in news is a joint partnership between which countries?
a)USA and EU
b)USA and Germany
c)Russia and Germany
d)USA and Japan
Ans-[B]
Explanation-SOFIA is an 80/20 partnership of NASA and the German Aerospace Center (DLR), consisting of an extensively modified Boeing 747SP aircraft carrying a reflecting telescope with an effective diameter of 2.5 meters (100 inches). The aircraft is based at NASA’s Armstrong Flight Research Center in Palmdale, Calif. The SOFIA Program Office is at NASA Ames Research Center in Moffett Field, Calif., which manages SOFIA’s science and mission operations in cooperation with the Universities Space Research Association (USRA; Columbia, Md.) and the German SOFIA Institute (DSI; University of Stuttgart)
Q.3)Consider the following statements about Sagarika
1.It is manufactured by DRDO
2.It is non nuclear capable submarine launched ballistic missile
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-[A]
Explanation- K-15 Sagarika is a nuclear-capable submarine-launched ballistic missile with a range of 750 kilometres. It belongs to the K Missile family and forms a part of India’s nuclear triad, and will provide retaliatory nuclear strike capability, It is manufactured by DRDO.
Q.4)Thymosin is responsible for:
a) Raising the blood sugar level
b) Raising the blood calcium level
c) Increased production of T lymphocytes
d) Decrease in blood RBC
Ans-[C]
Explanation-The thymus gland, located behind your sternum and between your lungs, is only active until puberty.
- After puberty, the thymus starts to slowly shrink and become replaced by fat.
- Thymosin is the hormone of the thymus, and it stimulates the development of disease-fighting T cells.
The thymus gland will not function throughout a full lifetime, but it has a big responsibility when it’s active—helping the body protect itself against autoimmunity, which occurs when the immune system turns against itself. Therefore, the thymus plays a vital role in the lymphatic system (your body’s defense network) and endocrine system.
Before birth and throughout childhood, the thymus is instrumental in the production and maturation of T-lymphocytes or T cells, a specific type of white blood cell that protects the body from certain threats, including viruses and infections. The thymus produces and secretes thymosin, a hormone necessary for T cell development and production.
The thymus is special in that, unlike most organs, it is at its largest in children. Once you reach puberty, the thymus starts to slowly shrink and become replaced by fat. By age 75, the thymus is little more than fatty tissue. Fortunately, the thymus produces all of your T cells by the time you reach puberty.
Q.5)Carbapenam are in news a lot these days. What are they?
a)Newly discovered nuclear protein
b)Antibiotics
c)Vaccines
d)None of the above
Ans-[B]
Explanation-Carbapenems are antibiotics used for the treatment of infections known or suspected to be caused by multidrug-resistant (MDR) bacteria. Their use is primarily in people who are hospitalized.
Like the penicillins and cephalosporins, they are members of the beta lactam class of antibiotics, which kill bacteria by binding to penicillin-binding proteins and inhibiting cell wall synthesis.
Q6.)Limestone in extraction of Iron serves the purpose of
a)Reducing agent
b)Oxidising agent
c)Formation of slag
d)None of the above
Ans-[C]
Explanation- Iron ore is not pure iron oxide – it also contains an assortment of rocky material that would not melt at the temperature of the furnace, and would eventually clog it up. The limestone is added to convert this into slag which melts and runs to the bottom. The heat of the furnace decomposes the limestone to give calcium oxide
CaCO3→CaO+CO2
This is an endothermic reaction, absorbing heat from the furnace. It is therefore important not to add too much limestone because it would otherwise cool the furnace. Calcium oxide is a basic oxide and reacts with acidic oxides such as silicon dioxide present in the rock. Calcium oxide reacts with silicon dioxide to give calcium silicate.
CaO+SiO2→CaSiO3
The calcium silicate melts and runs down through the furnace to form a layer on top of the molten iron. It can be tapped off from time to time as slag. Slag is used in road making and as “slag cement” – a final ground slag which can be used in cement, often mixed with Portland cement.
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