Which of the following will be a better shield against gamma rays ?

Related Mcqs:

1. Why gamma rays are used to kill bacteria to sterilize surgical equipment etc ?

   A. Chargeless B. Massless C. Highly penetrating D. All of above...

2. Which one of the following of glass can cut ultraviolet rays?

   A. Jena Glass B. Soda Glass C. Pyrex Glass D. Crookes Glass Submitted by: Parvez Malik...

3. X-rays are electromagnetic waves like________________?

   A. Light waves B. Heat waves C. Microwaves D. γ-rays...

4. If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?

   A. chromatic aberration B. spherical aberration C. both spherical and chromatic D. distortion...

5. A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?

   A. center of curvature B. focus C. optical center D. aperture...

6. The penetrating power of X-rays depends on their______________?

   A. applied voltage B. frequency C. source D. all of the above...

7. When X-rays are passed through successive aluminum sheets what happens to their thickness ?

   A. increases B. it decreases C. it remains same D. sometimes increases and sometimes decreases...

8. Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?

   A. A & B B. B & C C. A & C D. A B & C...

9. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?

   A. he/ev B. he/Vc C. eV/h D. impossible to predict...

10. X-rays are diffracted by a crystal but not by a diffraction grating because_____________?

    A. The ions in a crystal are well arranged B. The lines in a diffraction grating cannot reflect X-rays. C. The penetration power of X-rays is high in a diffraction grating D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal...