X-rays – LearnITbyTests

1. Which of the following statements is CORRECT about X-rays?

They have the shortest wavelength

They have the maximum frequency

Since C (velocity of light) = f x Lambda then fmax = c/(Lambda min)

All of the above

Question 1 of 17

2. If you increase the quantity of X-rays produced the strength remains the same (constant)?

True

False

Maybe

None

Question 2 of 17

3. Define X-rays

An X-ray is an electromagnetic wave

X-rays by their nature are unknown

X-rays are produced when a cathode ray beam suddenly hits a metal target

None of the above

Question 3 of 17

4. How can you determine the intensity (Quantity) of X-rays?

It is controlled by the heating current

It is controlled by the type of node and cathode

The greater the heating current the greater no. of electrons produced

No idea

Question 4 of 17

5. Explain what happens when X-rays pass through magnetic or electric fields?

They are deflected and charged

They are not deflected and not charged

They produce heat effect

None of the above

Question 5 of 17

6. How is cooling achieved in an X-ray tube in order to dissipate heat?

Through the cooling fins on the outside of the tube

Circulation of oil through the channels in the anode (copper) block

Use of a fan

use of turbo charger

Question 6 of 17

7. Mention the 2 types of X-rays?

Hard

Medium

Soft

tender

Question 7 of 17

8. Mention the uses of X-rays

X-rays are used in hospitals for diagnosis and treatment of diseases.

X-rays are used in industries to detect flaws in metal castings and welding

X-rays are used to inspect luggage for any hidden weapons.

All of the above

Question 8 of 17

9. Explain the energy transformation when a cathode ray beam is suddenly stopped by a metal target?

Its kinetic energy is transformed to heat energy (99.5%)

Only a small component of its kinetic energy is transformed into X-rays radiation (0.05%)

no idea

Its kinetic energy is transformed to potential energy

Question 9 of 17

10. How is an X-ray tube shielded from stray radiation?

They have a protective lead shield

Are built in concrete walls to absorb any leaking radiation

all of the mentioned

Have sound proof materials

Question 10 of 17

11. Which one of the following is not among the properties of X-ray

They travel in straight lines at the speed of light (3.0 x 10 to the power of 8 ) m/s

They are electromagnetic radiations of shorter wavelength than visible light

They can cause photoelectric emission

They have more penetrating power than gamma rays

Question 11 of 17

12. Hard X-rays are produced by fast moving electrons as a result of a high accelerating voltage. True or False?

False

True

Maybe

None

Question 12 of 17

13. Soft X-rays are produced by a relatively lower velocity electron beam than hard X-rays? True or False?

True

Maybe

None

Question 13 of 17

14. Which of the following statements is CORRECT about Soft X-rays?

Have low penetrating power

Have longer wavelengths

Have less energy

All of the above

Question 14 of 17

15. Mention the dangers of X-rays

Excessive exposure of X-rays on living tissue may lead to damage or death of cells

Little exposure leads to slow/ stagnant development of cells

X-rays damage luggage

None

Question 15 of 17

16. Which of the following statements is INCORRECT about Hard X-rays?

Have high penetrating power

They can penetrate through thick steel

Can penetrate the flesh but are absorbed by bones

Have a shorter wavelength

Question 16 of 17

17. How do you increase/ decrease the strength of the X-rays produced?

By increasing or decreasing the heating current

By the nature of anodes

By decelerating/ accelerating potential difference between the cathode and anode

None

Question 17 of 17

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