## Dual Nature Of Radiation and Matter Quiz-4

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q31. In a photocell bichromatic light of wavelength 2475 â„« and 6000 â„« are incident on cathode whose work function is 4.8 eV. If a uniform magnetic field of 3×10-5 tesla exists parallel to the plate, the radius of the path described by the photoelectron will be (mass of electron =9×10-31 kg)
•  1 cm
•  5 cm
•  10 cm
•  25 cm
Solution

Q32.The de-Broglie wavelength is proportional to
•  Î»∝1/v
•  Î»∝1/m
•   Î»∝1/p
•  Î»∝p
Solution
Î»=h/p
⇒Î»∝1/p

Q33.  Intensity of X-rays depends upon the number of
•  Electrons
•   Protons
•  Neutrons
•  Positrons
Solution
Intensity of X-rays depends upon the number of electron striking the target

Q34. If the mass of neutral =1.7×10-27kg, then the de-Broglie wavelength of neutral of energy 3eV is (h=6.6×10-34 J-s)
•  1.6×10-16m
•  1.6×10-11m
•  1.4×10-10m
•  1.4×10-11m
Solution

Q35.The work functions of metals A and B are in the ratio 1:2. If light of frequencies f and 2f are incident on the surfaces of A and B respectively, the ratio of the maximum kinetic energies of photoelectrons emitted is (f is greater than threshold frequency of A,2f is greater than threshold of B)
•  1 :1
•  1 :2
•  1 :3
•  1 :4
Solution

Q36. The minimum wavelength of X-rays produced in a coolidge tube operated at potential difference of 40 kV is
•  0.31 â„«
•  3.1 â„«
• 31 â„«
•  311 â„«
Solution

Q37.If threshold wavelength for a certain metal is 2000â„« , then the work function of metal is
•  6.2 MeV
•  6.2 keV
•  6.2 J
•  6.2 eV
Solution
6.2 eV

Q38.The energy of a photon of light with wavelength 5000 â„« is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1â„« would be
•  2.5/5000 eV
•  2.5/(5000)2 eV
•  2.5×5000 eV
•  2.5×(5000)2 eV
Solution

Q39.An electron is accelerated through a potential difference of V volt. The speed of electrons will be
•  √(eV/m)
•  √(2eV/m)
•  √(eV/2m)
•  √(m/2eV)
Solution

Q40. An electric field of intensity 6×104 Vm-1 is applied perpendicular to the direction of motion of the electron. A magnetic field of induction 8×10-2 Wm-2 is applied perpendicular to both the electric field and direction of motion of the electron. What is the velocity of the electron if it passes undeflected?
•  7.5×105 ms-1
•  7.5×10-5 ms-1
•  48×10-2 ms-1
• It is never possible
Solution

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