6103.Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when:
1. The orbit is geosynchronous.
2. The orbit is circular.
3. The orbit lies in the plane of the Earth’s equator.
4. The orbit is at an altitude of 22,236 km.
Select the correct answer using the codes given below:
1. The orbit is geosynchronous.
2. The orbit is circular.
3. The orbit lies in the plane of the Earth’s equator.
4. The orbit is at an altitude of 22,236 km.
Select the correct answer using the codes given below:
1, 2 and 3 only
1, 3 and 4 only
2 and 4 only
1, 2, 3 and 4
6104.The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?
The mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live not venture out
The mangroves provide both food and medicines which people are in need of after any natural disaster.
The mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or tsunami
The mangrove trees do not get uprooted by storms and tides because of their extensive roots
6106.The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?
Presence of prominent tropospheric turbulenc
Presence of prominent polar front and stratospheric cloud
Absence of polar front and stratospheric cloud
Increased temperature at polar region due to global warming
6107.The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?
1. There are no clouds or water vapour in the lower stratosphere.
2. There are no vertical winds in the lower stratosphere.
Which of the statements given above is/are correct in this context?
1. There are no clouds or water vapour in the lower stratosphere.
2. There are no vertical winds in the lower stratosphere.
Which of the statements given above is/are correct in this context?
1 only
2 only
Both 1 and 2
Neither 1 nor 2
6108.What is a zoom lens?
It is a lens having fixed focal length
It is a lens having variable focal length
It is a lens used in radio telescopes
None of the above
6110.What is the difference between a CFL and an LED lamp?
1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
2. The average life span of a CFL is much longer than that of an LED lamp
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements given above is/are correct?
1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
2. The average life span of a CFL is much longer than that of an LED lamp
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements given above is/are correct?
1 only
2 and 3 only
1 and 3 only
1, 2 and 3
6111.Which one of following reflects back more sunlight as compared to other three?
Sand desert
Paddy crop land
Land covered with fresh snow
Prairie land
6113.Seawater (i.e. saltwater) freezes at:
the same temperature as fresh water.
at a slightly higher temperature than fresh water
at a slightly lower temperature than fresh water.
seawater does not freeze.
6115.The Indian population receives the largest dose of ionizing radiation from:
natural sources.
fallout from nuclear weapons testing.
nuclear medicine.
nuclear power plants.
6119.What range of frequencies are usually referred to as audio frequencies for humans?
0 to 20 Hertz
20 to 20,000 Hertz
200 to 200,000 Hertz
10,000 to 30,000 Hertz
6123.Water boils at a lower temperature on the hills because
It is cold on the hills
There is less carbon dioxide on the hills
There is a decrease in air pressure on the hills
there is less oxygen
6127.Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
The north pole of another permanent magnet
A piece of iron that is not a permanent magnet
A positively charged glass rod
A negatively charged rubber rod
6129.The most serious environmental pollution from a nuclear reactor is
radioactivity
particulate formation
thermal pollution
noise pollution
6131.A temperature of 295 K is equivalent to approximately
0 degrees Fahrenheit
32 degrees Fahrenheit
72 degrees Fahrenheit
97 degrees Fahrenheit
6134.Defect of colour blindness can be remedied by the use of
Concave lens
Convex lens
Cylindrical lens
None of the above
6135.Which one among the following has the highest energy?
Blue light
Green light
Red light
Yellow light
6138.When 1 litre of water freezes, the volume of ice formed will be
0.9 litre
1.0 litre
1.11 litre
1.5 litre