American astronaut Scott Joseph Kelly commanded the International Space Station Consecutively for 340 days on ___.

The human spinal column is made up of ___ bones.

If Tan A = 15/8 and Tan B = 7/24, then Tan (A - B) = ?

The nation-wide campaign 'Operation Smile' is related to

Which of the following is not regarded as helpful to compost?

Astronauts inside spaceship feel ___ weight.

Mount Everest is located between

Divide Rs.221 in the ratio 1:3:6:7. The rupees in the respective ratios are