Understanding black holes

Miniature black holes. Left over from the big-bang beginning of the uniberse, tiny black holes might still wander through the universe. If one with a mass of 5.0 xx 10^11 kg (and a radius of only 5.0 xx 10^(-16)m ) reached Earth, at what distance from your head would its gravitational pull on you match that of Earth's?

Relation understanding is preferable over instrumental understanding as it helps the

" What do you understand by a hole in a semiconductor "

What do you understand by term 'holes' in a semiconductor? Discuss how they move under the influence of an electric field?

Consider the following statement: If you feel you are trapped in a black hole, don't give up. There is a way out. Who among the following made the above statement?

What do you understand by ozone hole? What are its consequences ? Why does it occur mainly over Antarctica ?