496: Why are dewdrops not formed on a cloudy night?
(a) Clouds absorb the radiation released from the Earths surface.
(b) Clouds reflect back the Earths radiation.
(c) The Earths surface would have low temperature on cloudy nights.
(d) Clouds deflect the blowing wind to ground level.
497: With reference to technologies for solar power production, consider the following statements :
1. Photovoltaics is a technology that generates electricity by direct conservation of light into electricity, while Solar Thermal is a technology that utilizes the Sunss rays to generate heat which is further used in electricity generation process.
2. Photovoltaics generates Alternating Current (AC), while Solar Thermal generates Direct Current (DC).
3. India has manufacturing base for Solar Thermal technology, but not for Photovoltaics.
Which of the statements given aboveis/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1, 2 and 3
(d) None
498: Who designed the city of Chandigarh?
(a) Le Corbusier
(b) Jacob Epstein
(c) Rodhin Auguste
(d) Ferdinand M. V. De Lesseps
499: Consider the following statements regarding Earth Hour :
1. It is an initiative of UNEP and UNESCO.
2. It is a movement in which the participants switch off the lights for one hour on a certain day every year.
3. It is a movement to raise the awareness about the climate change and the need to save the planet.
Which of the statements given above is/are correct?
(a) 1 and 3 only
(b) 2 only
(c) 2 and 3 only
(d) 1, 2 and 3
500: If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original volume ?
(a) 327°C
(b) 600°C
(c) 54°C
(d) 300°C