UGC NET Paper1 Previous Year Solved Papers - 5th December 2019 Evening Shift

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Option : D
Explanation :
Monitor and Printer is an output devices whereas Joystick, Keyboard, Mouse and Digitiser are input devices.

Option : B
Explanation :
The high global warming potential (GWP) greenhouse gases include hydro fluorocarbons (HFCs), per fluorocarbons (PFCs) and sulphur hexafluoride (SF₆). Like other GHGs, these gases trap heat in the atmosphere, but they are hundreds to thousands of times more effective at trapping heat, which leads to greater warming of the planet, compared to carbon dioxide (CO₂). The primary greenhouse gases in the atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Water vapour accounts the largest greenhouse effect (90-85%). The CFCs, hydro fluorocarbons (HFCs), hydro chlorofluorocarbons (HCFCs), per fluorocarbons (PFCs), and sulphur hexafluoride (SF6) are referred to as high GWP gases, that is, GWP can be up to tens of thousands. For a given amount of mass, they hold substantially more heat than does CO₂.

Option : B
Explanation :
Forests improve air quality by absorbing carbon dioxide which traps much more heat from the sun than is required, leading to global warming. So, Assertion (A) is true. Breathing ozone can trigger a variety of health problems including chest pain, coughing, throat irritation, and airway inflammation. It also can reduce lung function and harm lung tissue. Tropospheric ozone is a highly reactive oxidant that significantly reduces crop productivity as well as the uptake of atmospheric carbon by vegetation. It impedes plant growth and seed production, reduces functional leaf area and accelerates ageing. So, Reason (R) is true but does not explain (A).

Option : A
Explanation :
Institutions of Higher Education usually have students' council to represent students before the administration. However, these unions invariably have political orientation; they function more or less as the trainee units of those political parties and cannot avoid their interference. All this acts as a deterrent for the students to do well.