Question
Which of the following destroys the ozone
layer?Solution
Chlorine, primarily from man-made chemicals like chlorofluorocarbons (CFCs), is a major contributor to ozone layer depletion. These compounds release chlorine atoms when they break down in the stratosphere, leading to the destruction of ozone molecules.
Two cyclists start from villages R and S which are 234 km apart. One starts from R at 6:45 a.m. at 36 km/h. Another from S at 7:45 a.m. at 54 km/h towar...
A train 480 metre long takes 36 sec to cross a man running at a speed of 7 km/hr in the direction same to that of train. What is the speed of the train?
There are two trains A and B. A start from point X at 6 AM towards point Y. Another train B starts at 7 AM from point X. If they meet at 12 PM an...
- Two trains ‘T8’ and ‘U8’ of lengths 600 metres and 300 metres respectively are travelling towards each other. Ratio of speed of ‘T8’ to ‘U8�...
Train P starts from Lucknow to Dehradun at 11:55 am with an average speed of 30 m/s. Train Q starts from Dehradun to Lucknow at 1:35 pm with an average ...
Train 'K' leaves at 6:00 PM on Saturday from Ahmedabad station and reaches Surat station at 8:00 AM the next day, while train 'L' leaves at 7:00 PM on S...
A train travelling with a speed of 90 km/h can cross a pole in 8 seconds. Find the time taken by the train to cross a 300 metres long platform if the sp...
A train 300 metre long takes 30 sec to cross a man running at a speed of 6 km/hr in the direction opposite to that of train. What is the speed of the tr...
Length of a train, whose speed is 108 km/h, is 540 metres. Find the time taken (in seconds) by train to cross a bridge of length 360 metres.
The ratio of the length of two trains P and Q is 5:6 and the ratio of the time taken by both trains to cross a man standing on a platform is 2:3. If the...
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