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Form 4 Physics X-Rays Questions and Answers

In this session, we are going to solve form 4 Physics X-Rays questions. Answers are available in video format. The questions are suitable for those preparing for KCSE exams.

Lessons (16)

• 1.    Name the metal used to shield X-rays operators from the radiation. Give a reason why it is used.
  1m 0s

• 2.    State one industrial use of X-rays.
  2m 56s

• 3.    State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.
  1m 51s

• 4.    State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.
  0m 55s

• 5.    State the factor that determines the hardness of the X-rays produced in an X-ray tube.
  2m 26s

• 6.    State the property of X-rays, which makes it possible to detect cracks in bones.
  3m 6s

• 7.    Give a reason why the target in an X-ray tube is made of tungsten or molybdenum.
  2m 1s

• 8.    The target of X-ray tube is made of metals of high melting point. Give a reason for this.
  2m 19s

• 9.    State with a reason the effect of the X-rays produced in an X-ray tube, when the p.d across the tube is increased.
  1m 58s

• 10.    In an x-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased. Explain this observation.
  2m 33s

• 11.    An X-ray tube produces soft x-rays. State the adjustments that may be made so that the tube produces hard X-rays.
  1m 44s

• 12.    Figure 18 shows parts of an X-ray tube. a) Explain why: i. A potential difference is applied to the filament. ii. A high potential difference is applied between a cathode and the anode iii. Most of the tube is surrounded by lead. b) State how the resulting X-rays are affected by increasing the potential difference between the anode and the cathode.
  4m 21s

• 13.    Figure 5 shows a narrow beam of X-rays passing between two metal plates in air. The plates are connected in series with a switch, a cell and a milliammeter. It is observed that when the switch is closed a current flows in the milliammeter. Explain this observation
  3m 4s

• 14.    The anode of an X-ray tube becomes hot when the tube is in use. State the reason for this.
  2m 21s

• 15.    State how the intensity of X-rays in an X-ray tube can be increased.
  1m 45s

• 16.    State one difference between hard and soft X-rays.
  2m 1s