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UPSC Science Previous Year Questions 2018

 1.In which of the following areas can GPS technology be used?

1. Mobile phone operations
2. Banking operations
3. Controlling the power grids
Select the correct answer using the code given below:
a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3

Answer. D

2. Consider the following statements:
1. Light is affected by gravity.
2. The Universe is constantly expanding.
3. Matter warps its surrounding space-time.
Which of the above is/are the prediction/predictions of Albert Einstein's General
Theory of Relativity, often discussed in media?
a) 1 and 2 only
b) 3 only
c) 1 and 3 only
d) 1, 2 and 3


3. When the alarm of your smartphone rings in the morning, you wake up and tap it to stop the alarm which causes your geyser to be switched on automatically. The smart mirror in your bathroom shows the day's weather and also indicates the level of water in your overhead tank.
After you take some groceries from your refrigerator for making breakfast, it recognizes the
shortage of stock in it and places an order for the supply of fresh grocery items. When you step out of your house and lock the door, all lights, fans, geysers, and AC machines get switched off automatically. On your way to the office, your car warns you about traffic congestion ahead and suggests an alternative route, and if you are late for a meeting, it sends a message to your office accordingly. In the context of emerging communication technologies, which one of
the following terms best applies to the above scenario?
a) Border Gateway Protocol
b) Internet of Things
c) Internet Protocol
d) Virtual Private Network



4. "3D printing" has applications in which of the following?
1. Preparation of confectionery items
2. Manufacture of bionic ears
3.Automotive industry
4.  Reconstructive surgeries
5. Data processing technologies
Select the correct answer using the code given below:
a)1, 3, and 4 only
b)2, 3, and 5 only
c) 1 and 4 only
d) 1, 2, 3, 4 and 5



5. Consider the following statements:
1. The Barren Island volcano is an active volcano located in the Indian territory.
2. Barren Island lies about 140 km east of Great Nicobar. 
3. The last time the Barren Island volcano erupted was in 1991 and it has remained inactive since then.
Which of the statements given above is/are correct?
a) 1 only
b) 2 and 3
c) 3 only
d) 1 and 3



6. Why is a plant called Prosopis juliflora often mentioned in news?
a) Its extract is widely used in cosmetics.
b) It tends to reduce the biodiversity in the area in which it grows.
c) Its extract is used in the synthesis of pesticides.
d) None of these



7. Consider the following statements:
1. Most of the world's coral reefs are in tropical waters.
2. More than one-third of the world's coral reefs are located in the territories of Australia, Indonesia, and the Philippines.
3. Coral reefs host far more animal phyla than those hosted by tropical rainforests.
Which of the statements given above is/are correct?
a) 1 and 2 only
b) 3 only
c) 1 and 3 only
d) 1, 2 and 3



8. "Momentum for Change: Climate Neutral Now" is an initiative launched by
a) The Intergovernmental Panel on Climate Change
b) The UNEP Secretariat
c) The UNFCCC Secretariat
d) The World Meteorological Organization



9. With reference to India's satellite launch vehicles, consider the following statements:
1. PSLVs launch the satellite useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.
2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.
3. GSLV Mk III is a four-stage launch vehicle with the first and third stages using solid rocket motors, and the second and fourth stages using liquid rocket engines.
Which of the statements given above is/are correct?
a) 1 only
b) 2 and 3
c) 1 and 2
d) 3 only



10. Consider the following
1. Birds
2.Dust blowing
3. Rain
4. Wind blowing
Which of the above spread plant diseases?
a) 1 and 3 only
b) 3 and 4 only
c) 1, 2, and 4 only
d) 1, 2, 3 and 4



Answer: 
1-D; 2-D; 3-B; 4-D; 5-A;
6-B; 7-D; 8-C; 9-A; 10-D;

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