Is this the end of Ambani? #shorts | Shashank Udupa

Shashank went to the optician to get his eyes checked. He observed that the doctor combined two lenses and put these in front of his eyes so that he could see clearly. The powers of the two lenses used in the combination were -3 D and 4 D. Which of these will be the focal length of the combination of lenses Shashank has to wear?

Shashank started a work and left after 12 days, rest work done by Nitish in 15 days. Had Shashank left work, 2 days before, the rest work could have been done by Nitish in 18 days. If Shashank reduces his efficiency by 20% and Nitish increase his efficiency by 50%. Then in how many day working together they will finish the work?

A chromosome, in which the centromere is situated is situated close to its end so that one arm is very short and other vey long is

An X-raytube produces a continuous spectrum of radiation with its short- wavelength end at 0.33 Å . What is the maximum energy of a photon in the radiation?