Practice Test

Q1) X-ray beam can be deflected Show Answer

Q2) Consider a photon of continuous X-ray coming from a Coolidge tube. Its energy comes from Show Answer

Q3) The energy of a photon of characteristic X-ray from a Coolidge tube comes from Show Answer

Q4) If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength Show Answer

Q5) A direct X-ray photograph of the intensities is not generally taken by the radiologist because : Show Answer

Q6) X-rays which can penetrate through longer distances in substances are called : Show Answer

Q7) The target in an X-ray tube should be a : Show Answer

Q8) The maximum frequency of the X-rays produced in an X-ray tube : Show Answer

Q9) For harder X-rays, Show Answer

Q10) Cutoff wavelength of X-rays coming from a Coolidge tube depends on the Show Answer

Q11) The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation, Show Answer

Q12) For the structural analysis of crystals, X-rays are used because : Show Answer

Q13) The wavelength of X-ray is of the order of : Show Answer

Q14) In an X-ray tube, the intensity of the emitted X-ray beam is increased by : Show Answer

Q15) X-rays are known to be electromagnetic radiations. Therefore the X-ray photon has : Show Answer

Q16) X-ray region lies between : Show Answer

Q17) Which of the following is accompanied by the characteristic X-ray emission ? Show Answer

Q18) The shortest wavelength of X-rays emitted from an X-ray tube depends on the : Show Answer

Q19) The X-ray beam coming from an X-ray tube will be : Show Answer

Q20) The ratio of the speed of the electron in the ground state of hydrogen atom the speed of light in vacuum is : Show Answer

Q21) In order to study the internal structure of crystals, we use : Show Answer

Q22) If a high speed electron hit a target : Show Answer

Q23) A cathode ray tube is operated at 2500 V. The speed of electron will be Show Answer

Q24) The neutron, proton, electron and alpha particles are moving with equal kinetic energies. How can the particle be arranged in the increasing order of their velocities ? Show Answer

Q25) Cathode rays were discovered by Show Answer

Q26) Cathode rays are deflected by Show Answer

Q27) The specific charge on an electron is Show Answer

Q28) Which one of the following will be deflected by electric field ? Show Answer

Q29) Cathode rays are Show Answer

Q30) The value of retarding potential needed to stop the photoelectrons ejected from a metal surface of work function 1.2 eV with light of energy 2 eV is Show Answer

Q31) The phenomenon of photoelectric effect was explained by Show Answer

Q32) Photoelectrons are emitted when Show Answer

Q33) The work function for photoelectric effect Show Answer

Q34) Einstein was awarded noble prize for his Show Answer

Q35) The photoelectric effect is based on the law of conservation of Show Answer

Q36) Compton effect is associated with Show Answer

Q37) The energy of incident photon is 12.375 eV while the energy of scattered photon is 9.375 eV. Then KE of recoil photon is Show Answer

Q38) Conversion of light energy into electric energy is achieved in a Show Answer

Q39) Of the following properties, the photon does not possess Show Answer

Q40) The energy of photon corresponding to the visible light of maximum wavelength is nearly Show Answer

Q41) Positive rays were discovered by Show Answer

Q42) An electron is moving on a circular path of radius r with speed v in a transverse magnetic field B. The e/m for it will be Show Answer

Q43) Electrons in the atom are held due to Show Answer

Q44) The size of an atom is approximately equal to Show Answer

Q45) Total energy of an electron in an atom is Show Answer

Q46) According to Bohr's atomic model, the electron revolve around the nucleus in Show Answer

Q47) The difference in angular momentum associated with the electron in the two successive orbits of hydrogen atom is Show Answer

Q48) The speed of electron in the ground state of hydrogen atom is Show Answer

Q49) Ratio of energy of orbital electron in 4th orbit and 5th orbit of hydrogen atom is Show Answer

Q50) In which of the following experiments, the quantum nature of light has to be used, to explain the observations ? Show Answer

Q51) Molecular weight of heavy water used as a moderator in nuclear reactor is Show Answer

Q52) ASSERTION (A) : Ioniation potential of an atom is smaller than its excitation potential.
REASON (R) :
The ionisation releases a bonded electron and sets it free. Show Answer

Q53) ASSERTION (A) :
X-rays are used to detect cracks in bones.
REASON (R) :
Velocity of X-rays is different in different media. Show Answer

Q54) ASSERTION (A) :
X-ray tubes have cooling arrangements.
REASON (R) :
When high speed electrons hit a metal having high atomic number all the energy of electron is converted into X-rays. Show Answer

Q55) The wave nature of matter was first discovered by Show Answer

Q56) Which one among the following radiations carries maximum energy ? Show Answer

Q57) ASSERTION (A) :
Molybdenum is used as a target element for the production of X-rays.
REASON (R) :
It can easily deflect electrons. Show Answer

Q58) Consider the following statements :
(I) Gamma rays are not constituents of nuclei but they are emitted when a nucleus in an excited state returns to its normal state.
(II) The neutron to proton ratio for stable nuclei is always less than one.
(III) Beta rays consists of ordinary electrons which are of nuclear origin but do not revolve in orbits.
(IV) Both X-rays and Gamma rays are electromagnetic radiations.
Of the above statements Show Answer

Q59) The bright heavenly body with a long luminous tail is called a Show Answer

Q60) If the distance of 100 W bulb is increased from a photocell, the saturation current in the photocell varies with distance d as Show Answer

Q61) The speed of electron in the orbit of hydrogen atom in ground state is Show Answer

Q62) Cathode rays have velocity Show Answer

Q63) ASSERTION (A) : An electron in hydrogen atom jumps from n = 4 to n = 1 level. The maximum number of photon emitted is 6.
REASON (R) :
Maximum number of photon emitted can only be 4. Show Answer

Q64) ASSERTION (A) :
In outermost stationary orbit, energy of electron is negative.
REASON (R) :
In such orbits, electron is at maximum distance from the nucleus. Show Answer

Q65) ASSERTION (A) :
If electrons in an atom were stationary, they would fall in the nucleus.
REASON (R) :
Electrostatic force of attraction acts between negative electron and positive nucleus. Show Answer

Q66) Which one among the following transitions is associated with the largest change in energy in hydrogen atom ? Show Answer

Q67) Which one among the following transitions of hydrogen atom emits radiation of the shortest wavelength ? Show Answer

Q68) The penetrating power of X-rays can be increased by Show Answer

Q69) The visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm to which one of the following range does it belong ? Show Answer

Q70) When X-rays are produced Show Answer

Q71) Which one of the following statements is correct ? Show Answer

Q72) The ratio of velocity of X-rays to that of gamma rays Show Answer

Q73) Which one of the following pairs of rays is electromagnetic in nature ? Show Answer

Q74) The wavelength of X-rays is of the order of Show Answer

Q75) Consider the following four particles :
(I) alpha particle
(II) proton
(III) electron
(IV) neutron
Which of the following is the correct sequence in which their rest masses increases ? Show Answer

Q76) Consider the following parts of spectra :
(I) Visible
(II) Infrared
(III) Ultraviolet
(IV) Microwave
Which one of the following is the correct sequence in which their wavelengths increase ? Show Answer

Q77) Propagation of light quanta may be described by Show Answer