X-rays can be used

Options

A. for cutting and welding of metals.
B. to detect heart diseases.
C. to detect defects in precious stones and diamonds.
D. to detect gold under the earth.

Answer

C

Explanation

X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal inhomogeneities such as inclusions, lattice defects, etc in gems and stones.