-
question_answer1)
An X-ray tube is operated at 50 kV. The minimum wavelength produced is [CPMT 1996]
A)
0.5 Å done
clear
B)
0.75 Å done
clear
C)
0.25 Å done
clear
D)
1 Å done
clear
View Solution play_arrow
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question_answer2)
Which of the following wavelength falls in X-ray region [CPMT 1975; MP PMT 1984]
A)
10000 Å done
clear
B)
1000 Å done
clear
C)
1 Å done
clear
D)
10?2 Å done
clear
View Solution play_arrow
-
question_answer3)
A metal block is exposed to beams of X-ray of different wavelength. X-rays of which wavelength penetrate most [NCERT 1980; JIPMER 2002]
A)
2 Å done
clear
B)
4 Å done
clear
C)
6 Å done
clear
D)
8 Å done
clear
View Solution play_arrow
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question_answer4)
X-rays and gamma rays are both electromagnetic waves. Which of the following statements is true [NCERT 1973]
A)
In general X-rays have larger wavelength than of gamma rays done
clear
B)
X-rays have smaller wavelength than that of gamma rays done
clear
C)
Gamma rays have smaller frequency than that of X-rays done
clear
D)
Wavelength and frequency of X-rays are both larger than that of gamma rays done
clear
View Solution play_arrow
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question_answer5)
In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V, X-rays will have the lowest wavelength of 0.3094 Å [CPMT 1982; NCERT 1986, 87]
A)
10 kV done
clear
B)
20 kV done
clear
C)
30 kV done
clear
D)
40 Kv done
clear
View Solution play_arrow
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question_answer6)
In radio theraphy, X-rays are used to [CPMT 1972; BHU 2005]
A)
Detect bone fractures done
clear
B)
Treat cancer by controlled exposure done
clear
C)
Detect heart diseases done
clear
D)
Detect fault in radio receiving circuits done
clear
View Solution play_arrow
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question_answer7)
Hydrogen atom does not emit X-rays because [NCERT 1979; CPMT 1980, 90; RPET 1999]
A)
Its energy levels are too close to each other done
clear
B)
Its energy levels are too apart done
clear
C)
It is too small in size done
clear
D)
It has a single electron done
clear
View Solution play_arrow
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question_answer8)
X-rays were discovered by [NCERT 1977; BHU 2005]
A)
Becquerel done
clear
B)
Roentgen done
clear
C)
Marie Curie done
clear
D)
Von Laue done
clear
View Solution play_arrow
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question_answer9)
X-rays are [CPMT 1975; EAMCET 1995; RPET 2000; SCRA 1994]
A)
Stream of electrons done
clear
B)
Stream of positively charged particles done
clear
C)
Electromagnetic radiations of high frequency done
clear
D)
Stream of uncharged particles done
clear
View Solution play_arrow
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question_answer10)
The voltage applied across an X-rays tube is nearly [CPMT 1983]
A)
10 V done
clear
B)
100 V done
clear
C)
10000 V done
clear
D)
106 V done
clear
View Solution play_arrow
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question_answer11)
The characteristic X-ray radiation is emitted, when [CPMT 1975, 80, 90; RPET 1999]
A)
The electrons are accelerated to a fixed energy done
clear
B)
The source of electrons emits a monoenergetic beam done
clear
C)
The bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancy done
clear
D)
The valence electrons in the target atoms are removed as a result of the collision done
clear
View Solution play_arrow
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question_answer12)
Molybdenum is used as a target element for production of X-rays because it is [CPMT 1980; RPET 1999]
A)
A heavy element and can easily absorb high velocity electrons done
clear
B)
A heavy element with a high melting point done
clear
C)
An element having high thermal conductivity done
clear
D)
Heavy and can easily deflect electrons done
clear
View Solution play_arrow
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question_answer13)
Mosley's law relates the frequencies of line X-rays with the following characteristics of the target element [CPMT 1980; NCERT 1985]
A)
Its density done
clear
B)
Its atomic weight done
clear
C)
Its atomic number done
clear
D)
Interplaner spacing of the atomic planes done
clear
View Solution play_arrow
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question_answer14)
Compton effect is associated with [CPMT 1971]
A)
\[\alpha -\]rays done
clear
B)
\[\beta -\]rays done
clear
C)
X-rays done
clear
D)
Positive rays done
clear
View Solution play_arrow
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question_answer15)
X-rays are in nature similar to
A)
Beta rays done
clear
B)
Gamma rays done
clear
C)
de-Broglie waves done
clear
D)
Cathode rays done
clear
View Solution play_arrow
-
question_answer16)
If the cathode?anode potential difference in an X-ray tube be 105 V, then the maximum energy of X-ray photon can be
A)
105 J done
clear
B)
105 MeV done
clear
C)
10?1 MeV done
clear
D)
105 KeV done
clear
View Solution play_arrow
-
question_answer17)
The shortest wavelength of X-rays emitted from an X-ray tube depends on the [MP PMT 1987; CPMT 1988, 92; IIT 1982]
A)
Current in the tube done
clear
B)
Voltage applied to the tube done
clear
C)
Nature of gas in the tube done
clear
D)
Atomic number of target material done
clear
View Solution play_arrow
-
question_answer18)
The wavelength of X-rays is of the order of [CPMT 1983; MP PMT 1987; KCET 1994; JIPMER 1997]
A)
Centimetre done
clear
B)
Micron (10-6 m) done
clear
C)
Angstrom (10-10 m) done
clear
D)
Metre done
clear
View Solution play_arrow
-
question_answer19)
X ? rays and \[\gamma -\]rays of the same energies may be distinguished by [CPMT 1985]
A)
Their velocity done
clear
B)
Their ionising power done
clear
C)
Their intensity done
clear
D)
Method of production done
clear
View Solution play_arrow
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question_answer20)
When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-ray tube is operating at 40,000 volts [MP PMT 1993; NCERT 1984; MNR 1995; RPMT 2002]
A)
0.25 Å done
clear
B)
0.5 Å done
clear
C)
1.5 Å done
clear
D)
1.0 Å done
clear
View Solution play_arrow
-
question_answer21)
For continuous X-rays produced wavelength is
A)
Inversely proportional to the energy of the electrons hitting the target done
clear
B)
Inversely proportional to the intensity of the electron beam done
clear
C)
Proportional to intensity of the electron beam done
clear
D)
Proportional to target temperature done
clear
View Solution play_arrow
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question_answer22)
An X-ray has a wavelength of 0.010 Å. Its momentum is [AFMC 1980; RPMT 1995; Pb. PMT 2004]
A)
2.126 \[\times \]10?23 kg-m/sec done
clear
B)
6.626 \[\times \]10-22 kg-m/sec done
clear
C)
3.456 \[\times \] 20?25 kg-m/sec done
clear
D)
3.313 \[\times \]10?22 kg-m/sec done
clear
View Solution play_arrow
-
question_answer23)
X-rays are not used for radar purpose because
A)
They are not reflected by the target done
clear
B)
They are not electromagnetic waves done
clear
C)
They are completely absorbed by the air done
clear
D)
They sometimes damage the target done
clear
View Solution play_arrow
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question_answer24)
A direct X-ray photograph of the intestines is not generally taken by the radiologists because [CPMT 1986, 88]
A)
Intestines would burst on exposure to X-rays done
clear
B)
The X-rays would not pass through the intestines done
clear
C)
The X-rays will pass through the intestines without causing a good shadow for any useful diagnosis done
clear
D)
A very small exposure of X-rays causes cancer in the intestines done
clear
View Solution play_arrow
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question_answer25)
The patient is asked to drink \[BaS{{O}_{4}}\]for examining the stomach by X-rays because X-rays are
A)
Reflected by heavy atoms done
clear
B)
Refracted by heavy atoms done
clear
C)
Less absorbed by heavy atoms done
clear
D)
More absorbed by heavy atoms done
clear
View Solution play_arrow
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question_answer26)
X-rays can be used to study crystal structure, if the wavelength lies in the range
A)
2 Å to 0.1 Å done
clear
B)
10 Å to 5 Å done
clear
C)
50 Å to 10 Å done
clear
D)
100 Å to 50 Å done
clear
View Solution play_arrow
-
question_answer27)
When the accelerating voltage applied on the electrons increased beyond a critical value [CPMT 1975]
A)
Only the intensity of the various wavelengths is increased done
clear
B)
Only the wavelength of characteristic relation is affected done
clear
C)
The spectrum of white radiation is unaffected done
clear
D)
The intensities of characteristic lines relative to the white spectrum are increased but there is no change in their wavelength done
clear
View Solution play_arrow
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question_answer28)
The X-ray beam coming from an X-ray tube will be [IIT 1985; SCRA 1996; MP PET 1999]
A)
Monochromatic done
clear
B)
Having all wavelengths smaller than a certain maximum wavelength done
clear
C)
Having all wavelengths larger than a certain minimum wavelength done
clear
D)
Having all wavelengths lying between a minimum and a maximum wavelength done
clear
View Solution play_arrow
-
question_answer29)
The continuous X-rays spectrum produced by an X-ray machine at constant voltage has [DPMT 1999]
A)
A maximum wavelength done
clear
B)
A minimum wavelength done
clear
C)
A single wavelength done
clear
D)
A minimum frequency done
clear
View Solution play_arrow
-
question_answer30)
The penetrating power of X-rays increases with the [MP PMT 1984]
A)
Increase in its velocity done
clear
B)
Increase in its frequency done
clear
C)
Increase in its intensity done
clear
D)
Decrease in its velocity done
clear
View Solution play_arrow
-
question_answer31)
If \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] are the wavelengths of characteristic X-rays and gamma rays respectively, then the relation between them is [MP PMT 1987]
A)
\[{{\lambda }_{1}}=\frac{1}{{{\lambda }_{2}}}\] done
clear
B)
\[{{\lambda }_{1}}={{\lambda }_{2}}\] done
clear
C)
\[{{\lambda }_{1}}>{{\lambda }_{2}}\] done
clear
D)
\[{{\lambda }_{1}}<{{\lambda }_{2}}\] done
clear
View Solution play_arrow
-
question_answer32)
The wavelength \[\lambda \] of the \[{{K}_{\alpha }}\] line of characteristic X-ray spectra varies with atomic number approximatel [MP PMT 1987]
A)
\[\lambda \propto Z\] done
clear
B)
\[\lambda \propto \sqrt{Z}\] done
clear
C)
\[\lambda \propto \frac{1}{{{Z}^{2}}}\] done
clear
D)
\[\lambda \propto \frac{1}{\sqrt{Z}}\] done
clear
View Solution play_arrow
-
question_answer33)
The minimum frequency \[\nu \] of continuous X-rays is related to the applied potential difference V as
A)
\[\nu \propto \sqrt{V}\] done
clear
B)
\[\nu \propto V\] done
clear
C)
\[\nu \propto {{V}^{3/2}}\] done
clear
D)
\[\nu \propto {{V}^{2}}\] done
clear
View Solution play_arrow
-
question_answer34)
If V be the accelerating voltage, then the maximum frequency of continuous X-rays is given by [NCERT 1971; CPMT 1991; MP PET 2000; RPMT 2001; MP PMT 2002]
A)
\[\frac{eh}{V}\] done
clear
B)
\[\frac{hV}{e}\] done
clear
C)
\[\frac{eV}{h}\] done
clear
D)
\[\frac{h}{eV}\] done
clear
View Solution play_arrow
-
question_answer35)
The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of volts is equal to [CPMT 1986, 88, 91; RPMT 1997; RPMT 1997, 98; MP PET 1997, 98; MP PMT 1996, 98, 2003; UPSEAT 2005]
A)
\[\frac{eV}{hc}\] done
clear
B)
\[\frac{eh}{cV}\] done
clear
C)
\[\frac{hc}{eV}\] done
clear
D)
\[\frac{cV}{eh}\] done
clear
View Solution play_arrow
-
question_answer36)
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation [IIT 1988; ISM Dhanbad 1994; AIIMS 1997; MP PMT 1995, 2004]
A)
The intensity increases done
clear
B)
The minimum wavelength increases done
clear
C)
The intensity decreases done
clear
D)
The minimum wavelength decreases done
clear
View Solution play_arrow
-
question_answer37)
A potential difference of 42,000 volts is used in an X-ray tube to accelerate electrons. The maximum frequency of the X?radiations produced is [MP PMT 1993]
A)
\[{{10}^{19}}\,\,Hz\] done
clear
B)
\[{{10}^{18}}\,\,\,Hz\] done
clear
C)
\[{{10}^{16}}\,\,Hz\] done
clear
D)
\[{{10}^{20}}\,\,Hz\] \[(1\,eV=1.6\times {{10}^{-19}}J\] and \[h=6.63\times {{10}^{-34}}J-\sec )\] done
clear
View Solution play_arrow
-
question_answer38)
Which of the following is accompanied by the characteristic X-ray emission [MP PET 1993]
A)
\[\alpha -\]particle emission done
clear
B)
Electron emission done
clear
C)
Positron emission done
clear
D)
K?electron capture done
clear
View Solution play_arrow
-
question_answer39)
X-rays are known to be electromagnetic radiations. Therefore the X-ray photon has [MP PET 1993]
A)
Electric charge done
clear
B)
Magnetic moment done
clear
C)
Both electric charge and magnetic moment done
clear
D)
Neither electric charge nor magnetic moment done
clear
View Solution play_arrow
-
question_answer40)
X-rays of which of the following wavelengths are hardest
A)
4 Å done
clear
B)
1 Å done
clear
C)
0.1 Å done
clear
D)
2 Å done
clear
View Solution play_arrow
-
question_answer41)
X-ray beam can be deflected by [CPMT 2000; BHU 2001; Pb. PMT 2002]
A)
Magnetic field done
clear
B)
Electric field done
clear
C)
Both (a) and (b) done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer42)
X-rays are produced due to [CPMT 1985; JIPMER 2002]
A)
Break up of molecules done
clear
B)
Changing in atomic energy level done
clear
C)
Changing in nuclear energy level done
clear
D)
Radioactive disintegration done
clear
View Solution play_arrow
-
question_answer43)
X-rays region lies between [CPMT 1990]
A)
Short radiowave and visible region done
clear
B)
Visible and ultraviolet region done
clear
C)
Gamma rays and ultraviolet region done
clear
D)
Short radiowave and long radiowave done
clear
View Solution play_arrow
-
question_answer44)
The structure of solid crystals is investigated by using [CPMT 1992; NCERT 1975; CBSEPMT 1992]
A)
Cosmic rays done
clear
B)
X-rays done
clear
C)
Infrared radiations done
clear
D)
\[\gamma -\]rays done
clear
View Solution play_arrow
-
question_answer45)
In an X-rays tube, the intensity of the emitted X-rays beam is increased by [MNR 1992; RPMT 1996; UPSEAT 2000]
A)
Increasing the filament current done
clear
B)
Decreasing the filament current done
clear
C)
Increasing the target potential done
clear
D)
Decreasing the target potential done
clear
View Solution play_arrow
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question_answer46)
The binding energy of the innermost electron in tungsten is 40 keV. To produce characteristic X-rays using a tungsten target in an X-rays tube the potential difference V between the cathode and the anti-cathode should be [IIT 1985]
A)
V< 40 kV done
clear
B)
V \[\le \] 40 kV done
clear
C)
V > 40 kV done
clear
D)
V >/< 40 kV done
clear
View Solution play_arrow
-
question_answer47)
In above question the energy of the characteristic X-rays given out is [IIT 1985]
A)
Less than 40 keV done
clear
B)
More than 40 keV done
clear
C)
Equal to 40 keV done
clear
D)
\[\ge \]40 keV done
clear
View Solution play_arrow
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question_answer48)
The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40KeV electrons, is approximately (\[h=6.62\times {{10}^{-34}}\] J-sec; 1 eV = \[1.6\times {{10}^{-19}}\]J; c = \[3\times {{10}^{8}}\,m/s)\] [MNR 1991; MP PMT 1999; UPSEAT 2000; Pb. PET 2004]
A)
300 Å done
clear
B)
10 Å done
clear
C)
4 Å done
clear
D)
0.31 Å done
clear
View Solution play_arrow
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question_answer49)
X-rays which can penetrate through longer distances in substance are called [EAMCET 1983]
A)
Soft X-rays done
clear
B)
Continuous X-rays done
clear
C)
Hard X-rays done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer50)
An X-ray machine has an accelerating potential difference of 25,000 volts. By calculation the shortest wavelength will be obtained as (\[h=6.62\times {{10}^{-34}}\] J?sec; e = \[1.6\times {{10}^{-19}}\]coulomb) [MP PET 1994]
A)
0.25 Å done
clear
B)
0.50 Å done
clear
C)
1.00 Å done
clear
D)
2.50 Å done
clear
View Solution play_arrow
-
question_answer51)
For the production of X-rays of wavelength 0.1 Å the minimum potential difference will be [MP PMT 1994; RPMT 1995]
A)
12.4 kV done
clear
B)
24.8 kV done
clear
C)
124 kV done
clear
D)
248 kV done
clear
View Solution play_arrow
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question_answer52)
Mosley measured the frequency (f) of the characteristic X-rays from many metals of different atomic number (Z) and represented his results by a relation known as Mosley's law. This law is (a, b are constants) [MP PMT 1994; RPMT 1996]
A)
\[f=a{{(Z-b)}^{2}}\] done
clear
B)
\[Z=a{{(f-b)}^{2}}\] done
clear
C)
\[{{f}^{2}}=a(Z-b)\] done
clear
D)
\[f=a{{(Z-b)}^{1/2}}\] done
clear
View Solution play_arrow
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question_answer53)
Penetrating power of X-rays depends on [MP PMT 1994]
A)
Current flowing in the filament done
clear
B)
Applied potential difference done
clear
C)
Nature of the target done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer54)
The energy of a photon of characteristic X-rays from a Coolidge tube comes from [MP PET 1995]
A)
The kinetic energy of the striking electron done
clear
B)
The kinetic energy of the free electrons of the target done
clear
C)
The kinetic energy of the ions of the target done
clear
D)
An electronic transition of the target atom done
clear
View Solution play_arrow
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question_answer55)
An X-ray tube operates on 30 kV. What is the minimum wavelength emitted \[(h=6.6\times {{10}^{-34}}\]Js, \[e=1.6\times {{10}^{-19}}\]Coulomb, \[c=3\times {{10}^{8}}\]ms?1) [MP PMT 1995; DPMT 2001, 03]
A)
0.133 Å done
clear
B)
0.4 Å done
clear
C)
1.2 Å done
clear
D)
6.6 Å done
clear
View Solution play_arrow
-
question_answer56)
The wavelength of the most energetic X?ray emitted when a metal target is bombarded by 100 KeV electrons is approximately [MP PET 1996]
A)
12 Å done
clear
B)
4 done
clear
C)
0.31 Å done
clear
D)
0.124 Å done
clear
View Solution play_arrow
-
question_answer57)
An electron beam in an X-ray tube is accelerated through a potential difference of 50000 volts. These are then made to fall on a tungsten target. The shortest wavelength of the X-ray emitted by the tube is [MP PET 1997]
A)
2.5 Å done
clear
B)
0.25 nm done
clear
C)
0.25 cm done
clear
D)
0.025 nm done
clear
View Solution play_arrow
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question_answer58)
For harder X-rays [MP PET 1997]
A)
The wavelength is higher done
clear
B)
The intensity is higher done
clear
C)
The frequency is higher done
clear
D)
The photon energy is lower done
clear
View Solution play_arrow
-
question_answer59)
When cathode rays strike a metal target of high melting point with very high velocity, then [MP PMT 1997; AIIMS 1999]
A)
X-rays are produced done
clear
B)
Ealpha-rays are produced done
clear
C)
TV waves are produced done
clear
D)
Ultrasonic waves are produced done
clear
View Solution play_arrow
-
question_answer60)
Penetrating power of X-rays can be increased by [MP PMT 1997, 2000]
A)
Increasing the potential difference between anode and cathode done
clear
B)
Decreasing the potential difference between anode and cathode done
clear
C)
Increasing the cathode filament current done
clear
D)
Decreasing the cathode filament current done
clear
View Solution play_arrow
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question_answer61)
\[{{K}_{\alpha }}\]characteristic X-ray refers to the transition [MP PMT 1999]
A)
\[n=2\] to \[n=1\] done
clear
B)
\[n=3\] to \[n=2\] done
clear
C)
\[n=3\] to \[n=1\] done
clear
D)
\[n=4\] to \[n=2\] done
clear
View Solution play_arrow
-
question_answer62)
X-rays are produced in X-ray tube operating at a given accelerating voltage. The wavelength of the continuous X-rays has values from [IIT 1998; BVP 2003]
A)
0 to \[\infty \] done
clear
B)
\[{{\lambda }_{\min }}\] to\[\infty \], where \[{{\lambda }_{\min }}>0\] done
clear
C)
\[0\] to \[{{\lambda }_{\max }}\] where \[{{\lambda }_{\max }}<\infty \] done
clear
D)
\[{{\lambda }_{\min }}\] to \[{{\lambda }_{\max }}\], where 0 < \[{{\lambda }_{\min }}<{{\lambda }_{\max }}<\infty \] done
clear
View Solution play_arrow
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question_answer63)
The wavelength of X-rays is [EAMCET (Med.) 1995]
A)
2000 Å done
clear
B)
2 Å done
clear
C)
1 mm done
clear
D)
1 cm done
clear
View Solution play_arrow
-
question_answer64)
The ratio of the energy of an X-ray photon of wavelength 1 Å to that of visible light of wavelength 5000 Å is [EAMCET (Med.) 1995]
A)
1: 5000 done
clear
B)
5000 : 1 done
clear
C)
1 :25 \[\times \]106 done
clear
D)
25 \[\times \]106 done
clear
View Solution play_arrow
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question_answer65)
According to Mosley's law, the frequency of a spectral line in X-ray spectrum varies as [EAMCET (Med.) 1995; Pb. PMT 1999]
A)
Atomic number of the element done
clear
B)
Square of the atomic number of the element done
clear
C)
Square root of the atomic number of the element done
clear
D)
Fourth power of the atomic number of the element done
clear
View Solution play_arrow
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question_answer66)
For the structural analysis of crystals, X-rays are used because [IIT 1992; JIPMER 2000]
A)
X-rays have wavelength of the order of interatomic spacing done
clear
B)
X-rays are highly penetrating radiations done
clear
C)
Wavelength of X-rays is of the order of nuclear size done
clear
D)
X-rays are coherent radiations done
clear
View Solution play_arrow
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question_answer67)
The essential distinction between X-rays and \[\gamma -\]rays is that [BHU 1994; RPMT 1991; JIPMER 2001, 02]
A)
\[\gamma -\]rays have smaller wavelength than X-rays done
clear
B)
\[\gamma -\]rays emanate from nucleus while X-rays emanate from outer part of the atom done
clear
C)
\[\gamma -\]rays have greater ionizing power than X-rays done
clear
D)
\[\gamma -\]rays are more penetrating than X-rays done
clear
View Solution play_arrow
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question_answer68)
The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to [CBSE PMT 1996]
A)
\[\sqrt{V}\] done
clear
B)
\[{{V}^{2}}\] done
clear
C)
\[1/\sqrt{V}\] done
clear
D)
\[1/V\] done
clear
View Solution play_arrow
-
question_answer69)
What determines the hardness of the X-rays obtained from the Coolige tube [RPMT 1996]
A)
Current in the filament done
clear
B)
Pressure of air in the tube done
clear
C)
Nature of target done
clear
D)
Potential difference between cathode and target done
clear
View Solution play_arrow
-
question_answer70)
The most penetrating radiation out of the following is [CBSE PMT 1997]
A)
X-rays done
clear
B)
\[\beta \]-rays done
clear
C)
\[\alpha -\]particles done
clear
D)
\[\gamma -\]rays done
clear
View Solution play_arrow
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question_answer71)
On increasing the number of electrons striking the anode of an X-ray tube, which one of the following parameters of the resulting X-rays would increase [SCRA 1998; DPMT 2000]
A)
Penetration power done
clear
B)
Frequency done
clear
C)
Wavelength done
clear
D)
Intensity done
clear
View Solution play_arrow
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question_answer72)
What kV potential is to be applied on X-ray tube so that minimum wavelength of emitted X-rays may be 1Å (\[h=6.625\times {{10}^{-34}}\]J-sec) [UPSEAT 1999]
A)
\[12.42\,kV\] done
clear
B)
\[12.84kV\] done
clear
C)
\[11.98kV\] done
clear
D)
\[10.78kV\] done
clear
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question_answer73)
X-rays cannot be deflected by means of an ordinary grating due to [Pb. PMT 1999; MH CET 2000; BCECE 2004]
A)
Large wavelength done
clear
B)
High speed done
clear
C)
Short wavelength done
clear
D)
None of these done
clear
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question_answer74)
Consider the following two statements A and B and identify the correct choice in the given answer A: The characteristic X-ray spectrum depends on the nature of the material of the target. B: The short wavelength limit of continuous X-ray spectrum varies inversely with the potential difference applied to the X-rays tube [EAMCET (Med.) 2000]
A)
A is true and B is false done
clear
B)
A is false and B is true done
clear
C)
Both A and B are true done
clear
D)
Both A and B are false done
clear
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question_answer75)
The energy of an X- ray photon of wavelength 1.65 Å is \[(h=6.6\times {{10}^{-34}}J\text{-}sec,\,\,c=3\times {{10}^{8}}m{{s}^{-1}}\], \[1eV=1.6\times {{10}^{-19}}J)\] [EAMCET (Engg.) 2000]
A)
3.5 keV done
clear
B)
5.5 keV done
clear
C)
7.5 keV done
clear
D)
9.5 keV done
clear
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question_answer76)
If \[\lambda \]=10Å, then it corresponds to [DCE 2000]
A)
Infra-red done
clear
B)
Microwave done
clear
C)
Ultra-violet done
clear
D)
X-rays done
clear
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question_answer77)
Bragg?s law for X-rays is [UPSEAT 2001]
A)
d sin \[\theta \]= \[2n\lambda \] done
clear
B)
\[2d\,\sin \,\theta =n\lambda \] done
clear
C)
\[n\sin \theta =2\lambda d\] done
clear
D)
None of these done
clear
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question_answer78)
The X-rays produced in a coolidge tube of potential difference 40V have minimum wavelength of [MH CET (Med.) 2001]
A)
\[3.09\times {{10}^{-8}}m\] done
clear
B)
\[5.09\times {{10}^{8}}m\] done
clear
C)
\[4.09\times {{10}^{-8}}m\] done
clear
D)
\[1.09\times {{10}^{8}}m\] done
clear
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question_answer79)
For the production of X-rays, the target should be made of [BHU 2000; CPMT 2001]
A)
Steel done
clear
B)
Copper done
clear
C)
Aluminum done
clear
D)
Tungsten done
clear
View Solution play_arrow
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question_answer80)
Intensity of X-rays depends upon the number of [SCRA 1998; DPMT 2000; AFMC 2001]
A)
Electrons done
clear
B)
Protons done
clear
C)
Neutrons done
clear
D)
Positrons done
clear
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question_answer81)
In an X-ray tube electrons bombarding the target produce X-rays of minimum wavelength 1 Å. What must be the energy of bombarding electrons [KCET 2001]
A)
13375 eV done
clear
B)
12375 eV done
clear
C)
14375 eV done
clear
D)
15375 eV done
clear
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question_answer82)
If energy of K-shell electron is ? 40000 eV and If 60000 V potential is applied at coolidge tube then which of the following X-ray will get form [RPET 2001]
A)
Continuous done
clear
B)
White X-rays done
clear
C)
Continuous and all series of characteristic done
clear
D)
None of these done
clear
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question_answer83)
For production of characteristic \[{{K}_{\beta }}\,\]X-rays, the electron transition is [MP PET 2001]
A)
\[n=2\,\,\,\text{to}\,\,\,n=1\] done
clear
B)
\[n=\,3\,\,\,\text{to}\,\,\,n=2\] done
clear
C)
\[n=3\,\,\,\text{to}\,\,\,n=1\] done
clear
D)
\[n=4\,\,\,\text{to}\,\,\,n=2\] done
clear
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question_answer84)
Penetrating power of X-rays does not depend on [MP PET 2001]
A)
Wavelength done
clear
B)
Energy done
clear
C)
Potential difference done
clear
D)
Current in the filament done
clear
View Solution play_arrow
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question_answer85)
The potential difference applied to an X-ray tube is 5kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is [IIT-JEE (Screening) 2002]
A)
\[2\times {{10}^{16}}\] done
clear
B)
\[5\times {{10}^{16}}\] done
clear
C)
\[1\times {{10}^{17}}\] done
clear
D)
\[4\times {{10}^{15}}\] done
clear
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question_answer86)
For the production of characteristic \[{{K}_{\gamma }},\]X-ray, the electron transition is [BHU 2002]
A)
\[n=2\,\,\,to\,\,\,n=1\] done
clear
B)
\[n=3\,\,\,to\,\,n=2\] done
clear
C)
\[n=3\,\,\,to\,\,n=1\] done
clear
D)
\[n=4\,\,\,to\,\,n=1\] done
clear
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question_answer87)
When X rays pass through a strong uniform magnetic field, Then they [MP PET 2002; RPMT 2002, 03]
A)
Do not get deflected at all done
clear
B)
Get deflected in the direction of the field done
clear
C)
Get deflected in the direction opposite to the field done
clear
D)
Get deflected in the direction perpendicular to the field done
clear
View Solution play_arrow
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question_answer88)
If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be [MP PET 2002; RPMT 1995; CBSE PMT 1996]
A)
\[\frac{1227}{\sqrt{V}}{AA}\] done
clear
B)
\[\frac{1240}{V}{AA}\] done
clear
C)
\[\frac{2400}{V}{AA}\] done
clear
D)
\[\frac{12400}{V}{AA}\] done
clear
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question_answer89)
What is the difference between soft and hard X-rays [MP PMT 2002; AIIMS 2002]
A)
Velocity done
clear
B)
Intensity done
clear
C)
Frequency done
clear
D)
Polarization done
clear
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question_answer90)
X-ray will travel minimum distance in [MP PET 2003]
A)
Air done
clear
B)
Iron done
clear
C)
Wood done
clear
D)
Water done
clear
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question_answer91)
The minimum wavelength of X-ray emitted by X-rays tube is 0.4125 Å. The accelerating voltage is [BHU 2003; CPMT 2004; MP PMT 2005]
A)
30 kV done
clear
B)
50 kV done
clear
C)
80 kV done
clear
D)
60 kV done
clear
View Solution play_arrow
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question_answer92)
Characteristic X-rays are produced due to [AIIMS 2003]
A)
Transfer of momentum in collision of electrons with target atoms done
clear
B)
Transition of electrons from higher to lower electronic orbits in an atom done
clear
C)
Heating of the target done
clear
D)
Transfer of energy in collision of electrons with atoms in the target done
clear
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question_answer93)
X-rays when incident on a metal [BCECE 2003; RPMT 2003]
A)
Exert a force on it done
clear
B)
Transfer energy to it done
clear
C)
Transfer pressure to it done
clear
D)
All of the above done
clear
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question_answer94)
The minimum wavelength of X-rays produced in a coolidge tube operated at potential difference of 40 kV is [BCECE 2003; RPET 2002, 03]
A)
0.31 Å done
clear
B)
3.1 Å done
clear
C)
31 Å done
clear
D)
311 Å done
clear
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question_answer95)
The potential difference between the cathode and the target in a Collidge tube is 100 kV. The minimum wavelength of the X-rays emitted by the tube is [Pb. PMT 2004]
A)
0.66 Å done
clear
B)
9.38 Å done
clear
C)
0.246 Å done
clear
D)
0.123 Å done
clear
View Solution play_arrow
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question_answer96)
X-rays are produced by accelerating electrons by voltage V and let they strike a metal of atomic number Z. The highest frequency of X-rays produced is proportional to [UPSEAT 2004]
A)
V done
clear
B)
Z done
clear
C)
(Z ? 1) done
clear
D)
\[{{(Z-1)}^{2}}\] done
clear
View Solution play_arrow
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question_answer97)
If the operating potential of an X-ray tube is 50 kV, the velocity of X-rays coming out of it is [RPMT 2003]
A)
\[4\times {{10}^{4}}\,m/s\] done
clear
B)
\[3\times {{10}^{8}}\,m/s\] done
clear
C)
\[{{10}^{8}}\,m/s\] done
clear
D)
\[3\,m/s\] done
clear
View Solution play_arrow
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question_answer98)
If the voltage of X-ray tube is doubled, the intensity of X-rays will become [RPMT 2003]
A)
Half done
clear
B)
Unchanged done
clear
C)
Double done
clear
D)
Four times done
clear
View Solution play_arrow
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question_answer99)
If the minimum wavelength obtained in an X-ray tube is \[2.5\times {{10}^{-10}}m\], the operating potential of the tube will be [RPMT 2003]
A)
2 kV done
clear
B)
3 kV done
clear
C)
4 kV done
clear
D)
5 kV done
clear
View Solution play_arrow
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question_answer100)
The wavelength of X-rays decreases, when [RPMT 2002]
A)
Temperature of target is increased done
clear
B)
Intensity of electron beam is increased done
clear
C)
K.E. of electrons striking the target is increased done
clear
D)
K.E. of electrons striking the target is decreased done
clear
View Solution play_arrow
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question_answer101)
X-rays are produced in laboratory by [RPMT 1998]
A)
Radiation done
clear
B)
Decomposition of the atom done
clear
C)
Bombardment of high energy electron on heavy metal done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer102)
In vacuum an electron of energy 10 keV hits tungsten target, then emitted radiation will be [RPMT 2001]
A)
Cathode rays done
clear
B)
X-rays done
clear
C)
Infrared rays done
clear
D)
Visible spectrum done
clear
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question_answer103)
X-rays of \[\lambda =1\,{AA}\] have frequency [DCE 1998]
A)
\[3\times {{10}^{8}}\,Hz\] done
clear
B)
\[3\times {{10}^{18}}\,Hz\] done
clear
C)
\[3\times {{10}^{10}}\,Hz\] done
clear
D)
\[3\times {{10}^{15}}\,Hz\] done
clear
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question_answer104)
Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as [AIIMS 2005]
A)
\[f\propto \sqrt{Z}\] done
clear
B)
\[f\propto {{Z}^{2}}\] done
clear
C)
\[f\propto Z\] done
clear
D)
\[f\propto {{Z}^{3/2}}\] done
clear
View Solution play_arrow
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question_answer105)
Compton effect shows that [DPMT 1995]
A)
X-rays are waves done
clear
B)
X-rays have high energy done
clear
C)
X-rays can penetrate matter done
clear
D)
Photons have momentum done
clear
View Solution play_arrow
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question_answer106)
An X-ray tube with a copper target emits Cu \[{{K}_{\alpha }}\] line of wavelength 1.50 Å. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays\[(h=6.63\times {{10}^{-34}}J\text{-}\sec ,\ c=3\times {{10}^{8}}m/s)\] [Orissa JEE 1996]
A)
8280 V done
clear
B)
828 V done
clear
C)
82800 V done
clear
D)
8.28 V done
clear
View Solution play_arrow
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question_answer107)
In X-ray spectrum wavelength l of line \[{{K}_{\alpha }}\] depends on atomic number Z as [RPMT 1995; DCE 2002]
A)
\[\lambda \propto {{Z}^{2}}\] done
clear
B)
\[\lambda \propto {{(Z-1)}^{2}}\] done
clear
C)
\[\lambda \propto \frac{1}{(Z-1)}\] done
clear
D)
\[\lambda \propto \frac{1}{{{(Z-1)}^{2}}}\] done
clear
View Solution play_arrow
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question_answer108)
Absorption of X-ray is maximum in which of the following different sheets [RPMT 1995]
A)
Copper done
clear
B)
Gold done
clear
C)
Beryllium done
clear
D)
Lead done
clear
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question_answer109)
The wavelength of \[{{K}_{\alpha }}\] line in copper is 1.54 Å. The ionisation energy of K electron in copper in Joule is [EAMCET 1984]
A)
\[11.2\times {{10}^{-27}}\] done
clear
B)
\[12.9\times {{10}^{-16}}\] done
clear
C)
\[1.7\times {{10}^{-15}}\] done
clear
D)
\[10\times {{10}^{-16}}\] done
clear
View Solution play_arrow
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question_answer110)
The wavelength of \[{{K}_{\alpha }}\] line for an element of atomic number 43 is l. Then the wavelength of \[{{K}_{\alpha }}\] line for an element of atomic number 29 is
A)
\[\frac{43}{29}\lambda \] done
clear
B)
\[\frac{42}{28}\lambda \] done
clear
C)
\[\frac{9}{4}\lambda \] done
clear
D)
\[\frac{4}{9}\lambda \] done
clear
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question_answer111)
In X-ray experiment Ka, Kb denotes [DCE 2005]
A)
Characteristic done
clear
B)
Continuous wavelength done
clear
C)
a, b-emissions respectively done
clear
D)
None of these done
clear
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