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Legal Aptitude is an important subject in CLAT,DULLB & Other Law Exams. In any of law exam, legal aptitude carries weightage of 25 % of questions. With focused practice good marks can be fetched from this section. These questions are very important in achieving your success in CLAT, DULLB and Other Law Exams..

Q51. In Davisson - Germer experiment maximum intensity is observed at
•   54oand 54 V
•  54oand 50 V
•  50oand 50 V
•  65oand 50 V
Solution
We know that in Davisson-Germer experiment maximum intensity is observed at 54oand 50 V.

Q52.According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum
•  Energy and momentum
•  Speed and momentum
•  Speed only
•  Energy only
Solution
Speed of photon is 3×108 m/s in vacuum

Q53.  X-rays are
•   Stream of electrons
•  Stream of positively charged particles
•  Electromagnetic radiantions of high frequency
•  Stream of uncharged particles
Solution

Q54. Work function of lithium and copper are respectively 2.3 eV and 4.0 eV. Which one of the metal will be useful for the photoelectric cell working with visible light (h=6.6×10-34 J-s,c=3×108 m/s)
•  Lithium
•  Copper
•  Both
•  None of these
Solution
Q55. For characteristic X-ray of some material
•  E(Kγ)<E(Kβ )<E(Kα)
•  E(Kα )<E(Lα )<E(Mα)
•  λ(Kγ )<λ(Kβ )<λ(Kα)
•  λ(Mα)<λ(Lα )<λ(Kα)
Solution
∵E(K )>E(Kβ )>E(Kα )⇒λ(Kγ )<λ(Kβ )<λ(K)

Q56. What is the de-Broglie wavelength of the α-particle accelerated through a potential difference VIn an X-rays tube, the intensity of the emitted X-rays beam is increased by
•  0.287/√V Å
• 12.27/√V Å
•  0.101/√V Å
•  0.202/√V Å
Q57.The radius of the orbital of electron in the hydrogen atom is 0.5 Å. The speed of the electron is 2×106 m/s. Then the
current in the loop due to the motion of the electron is
•  1 mA
•  1.5 mA
•  1.5 mA
•  2 mA
Q58.An electron with (rest mass m0) moves with a speed of 0.8c. Its mass when it moves with this speed is
•  m0
•  m0/6
•  5m0/3
•  3m0/5
Q59.The minimum energy required to remove an electron is called
•  Stopping potential
•  Kinetic energy
•  Work function
•  None of these
Solution
Work function

Q50. 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
•  A is true and B is false
•  A is false and B is true
•  Both A and B are true
• Both A and B are false
Solution
Both A and B are true ## Want to know more

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