Download App

12. atoms — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics12. atoms1 Mark
MCQ
Assertion : Soft and hard $X-$ rays differ in frequency as well as velocity.
Reason : The penetrating power of hard $X-$ rays is more than the penetrating power of soft $X-$ rays.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • ✓
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: D.
If both the Assertion and Reason are incorrect.
d
Soft and hard $X-$ rays differ only in frequency. Soft $X-$ rays have low frequency as compared to hard $X-$ rays. But both types of  $X-$ ray travel with speed of light.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 12. atoms→12. atoms — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The short range attractive nuclear forces that are responsible for the binding of nucleons in a nucleus are supposed to be caused by the role played by the particles called:
→
Of the following Fig., the lines of magnetic induction due to a magnet $SN$, are given by
→
Which atom contains exactly $15$ neutrons?
→
Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force one wire exerts on the other per metre of length is
→
A long, straight wire is turned into a loop of radius $10\,cm$ (see figure). If a current of $8\, A$ is passed through the loop, then the value of the magnetic field and its direction at the centre $C$ of the loop shall be close to
→
Two waves having intensity in the ratio $25 : 4$ produce interference. The ratio of the maximum to the minimum intensity is
→
Which of the following are conductors.
→
In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be
→
Of the diodes shown in the following diagrams, which one is reverse biased
→
Coulomb’s force between two stationery charges is also:
→