Questions asked by Rishin Mondal

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• The water is spreading round it's side from a fountain kept just above the soil. If the velocity of fountain water be 'V', then how much area would get wet?
  
• What is protonema?
  
• A stone is thrown horizontally with velocity √(2gh) from a top of a tower of hight 'h'. Find where it will strike the level ground through the foot of the tower. What will be it's striking velocity?
  
• A particle reaches it's highest point, when it covers half of it's range. How is the corresponding point on the 's - t' curve characterised?
  
• Two projectiles, one fired from earth with 5m/s and other from another planet with 3m/s trace identical trajectory. If g (earth) = 9.8 m/s², then g (planet) = ?
  
• A projectile is thrown with the speed 'u' at an angle '⍬' to the horizontal. What is the radius of curvature of it's trajectory when the velocity vector of the projectile makes an angle '⍺' with the horizontal?
  
• Two insulated charged spherical bodies having radii R and 2R have their same surface density of charges (D). When these two bodies are connected by a conducting wire, what will be the surface density of charge of the bigger sphere?
  
• A pendulum consists of a small mass 'm' suspended by a thread of length 'l'. The mass carries a +q charge. The pendulum is placed in uniform electric field 'E' directed vertically upwards. What will be the time period of the oscillation?
  
• Let there be spherically symmetric charge distribution with charge density P(x)=Pₒ[(5/4)-(r/R)] up-to r=R, P(r)=0 for r≻R. Where 'r'is the distance from origin. What is the electric field at a distance 'r' (r≻R) form the origin?
  
• Eight electric dipoles (each having charge 'e') are placed at the centre of a regular cube of each side '1m'. What is the total normally outward flux through the cube?
  
• The electric potential at point (x, y, z) Is given by V=-x²y-xz³+4. What is the magnitude of electric field at (1,1,1)?
  
• Radium emits (8.4*10¹⁰) ⋉ particle/gm/s and thus produces 'He' gas at the rate of 1.69*10⁻⁴ ml/gm/day at NTP. So what is the value of 'avogadro number'?
  
• Light of wavelength 5000 Å and intensity 39.8 W/m² is incident on a metal surface. If only 1% photons of incident light emit photo electrons, then what will be the number of electrons emitted/sec/unit area from the surface?
  
• Potential energy of mass m is U(x)=Eₒ,when 0≤x≤1, =0when x≻1.The total energy of the particle is 2Eₒ. The De Broglie wave length of the particle is λ₁ when 0≤x≤1 and λ₂ when x≻1. what is the ratio of λ₁ and λ₂ ?
  
• A singly ionized 'He' ion and 'H' ion are accelerated from rest through a potential difference 'V' to velocities 'U(He)' and 'U(H)' respectively. What is the ratio of 'U(He)/U(H)'?
  
• An electron is revolving round the nucleus (stationary) of charge 'Ze'. The amount of energy '47.2 eV' is required to transit the electron from 2nd orbit to 3rd orbit.What is the value of 'Z' ?
  
• A point source is placed at a distance of 30cm from a convex lens (f=15cm). A glass slab of thickness 1cm is kept just in the opposite side of the lens. The refractive index of glass is 1.5. what will be image distance from lens?