Q. Which among the given is a radioactive element

Explanation by: Ram Sharma

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 Questions and Answers
4081.  The angle in which a cricket ball should be hit to travel max. horizontal distance is:

A
  60° with horizontal

B
 30° with horizontal

C
 15° with horizontal

D
 45° with horizontal

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Answer & Explanation
Answer : Option D
Explanation :
45° with horizontal.This has to do with the equation of a parabola or trajectory which is z = (tanq)x – q 2 (cos) q x 2. We can see that if the ball is fired at a 45 degree angle from the ground, the horizontal distance will be a maximum.
4082.  Which among the given is a radioactive element -

A
  Chromium

B
 Cobalt

C
 Uranium

D
 Argon


 
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Answer & Explanation
Answer : Option C
Explanation :
Uranium.Uranium (U) is a naturally occurring radioactive element. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable ar- rangement.In fact, uranium was the element that made the discovery of radioactivity possible.