Approximately tidal cycle in one year are about
a) 70
b) 300
c) 705
d) none
When the gravitational forces due to the sun and moon add together tides of maximum range
a) neap tidal
b) spring tidal
c) both a and b
d) none of these
Pollution:
Any harmful change in environment is called…
a) global warming
b) pollution
c) acid rain
d) ozone depletion
The main types of pollution are…………….…
a) two
b) three
c) four
d) six
Explanation: 1. Air pollution, 2. Water pollution and 3. Land pollution
Which of the following is/are the major cause of air pollution?
a) oxides of carbon, oxygen and nitrogen
b) Chloroflourocarbons (CFCs)
c) lead compounds and particulates
d) all of these
