4586: 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.
4587: Where does exchange of gases (O2 and CO2) take place in our lungs ?
(a) Alveoli
(b) Bronchi
(c) Pleura
(d) Trachea
4588: A spherical body moves with a uniform angular velocity around a circular path of radius r. Which one of the following statements is correct?
(a) The body has no acceleration
(b) The body has a radial acceleration 2r directed towards the centre of the path.
(c) The body has a radial acceleration 2/5 2r directed away from the centre of the path.
(d) The body has an acceleration 2r tangential to its path
4589: Consider the following events :
1. Hunter Commission
2. Charles Wood's Despatch
3. Sadler Commission
4. Raleigh Commission
Their correct chronological sequence is
(a) 3 - 2 - 1 - 4
(b) 2 - 1 - 4 - 3
(c) 1 - 4 - 3 - 2
(d) 4 - 3 - 2 - 1
4590: Which one of the following is not correctly matched ?
(a) Isopleth : A line joining places of equal height
(b) Isobar : A line joining places of equal pressure
(c) Isohyet : A line joining places of equal rainfall
(d) Isotherm : A line joining places of equal temperature