The angle of elevation of the top of a tower from the top of a building whose height is 680 m is 45° and the angle of elevation of the top of same tower from the foot of the same building is 60°. What is the height (in m) of the tower?

In the  following question, select the odd letters from the given alternatives.

When is National Sports Day celebrated every year?

Which of the following gas is not present in the atmosphere?

The number of small cubes that are coloured with single surface? 

Which state has launched the mobile app 'Amrit Vahini', to enable booking beds at Covid-19 hospitals on a real-time basis by the patients?

Department of Industry Promotion and Internal Trade (DPIIT) has increased the percentage of investment of foreign companies in defense sector from 49 to what percentage?

How many bridges will Defense Minister Rajnath Singh inaugurate today?