MCQ questions -X-ray -Science cycle -3

MCQ questions -X-ray -Science cycle –3

1.In radiotherapy, X-rays are used to:

1. Detect bone fracture
2. Treat cancer
3. Detect skin disease
4. Detect fault in the radio receiving circuit

Ans: D

2.X-rays will not show the phenomena of———–

1. Diffraction
2. Polarization
3. Interference
4. Deflection by an electric field

Ans: D

3.In radiotherapy, X-rays are used to:

1. Detect bone fracture
2. Treat cancer
3. Detect skin disease
4. Detect fault in the radio receiving circuit

Ans: B

4.X-rays can’t penetrate through a sheet of:

1. Wood
2. Paper
3. Aluminum
4. Lead

Ans: D

5.Penetrating power of X-ray increases through:

1. Increase in p.d between cathode and anode
2. Speed
3. Distance
4. Velocity

Ans: A

6. X-rays diffraction was first of all observed by——
7. Laue
8. Bragg
9. Zeeman
10. Moseley

Ans: A

7. The hydrogen atom does not emit X – rays because:
8. It is too small in size
9. Its energy levels are too far apart
10. Its energy levels are too close to each other
11. It has a single electron

Ans: C

8. When objects placed in a room are exposed to X-rays, they appear:
9. Invisible
10. Yellow
11. Blue
12. Red

Ans: A

9. 10 KeV electron strikes a tungsten target in a vacuum. The radiation emitted by the target is————-
10. Visible light
11. X-rays
12. Infrared radiation
13. Radio wave

Ans: B

10. The wavelength of characteristic X-rays depends upon—–
11. Size of target
12. Mass of target
13. Temperature of target
14. Atomic no. of target

Ans: D

11. The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. The no. of electrons striking the target per second is——–
12. 2 × 1016
13. 5 × 1016
14. 1 × 1017
15. 4 × 1015

Ans: A

12. 12. Kα wavelength emitted by an atom λ is given by an atom of a number Z = 11 is λ. Find the atomic number for an atom that emits Kα radiation with wavelength 4λ.
13. Z = 6
14. Z = 4
15. Z = 11
16. Z = 44

Ans: A