SET 1
1) A patient is suggested to put off his gold ornaments before taking the X-ray photograph, why?
2) Differentiate between Fresnel’s and Fraunhoffer’s diffraction.
3) Define binding energy. Explain a graph showing the relation between the binding energy per nucleon and mass number.
4) How is magnetic field made radial in a moving coil galvanometer?
5) A light source consumes 75 W of electric power. If all this energy goes into emitted light of wavelength 600 nm. Calculate the frequency of the emitted light and the number of photons per second emitted by the source.
6) 400 nm wavelength of light falls on a photo sensitive material of work function 2.3 eV. Compute the maximum energy of photoelectrons.
7) Two plane metal plates 4cm long are held horizontally 3cm apart in a vacuum, one being vertically above the other. The upper plate is at potential of 300V and the lower plate is earthed. Electrons having a velocity of 107m/s are injected horizontally midway between the plates and in a direction parallel to the 4cm edge. Calculate the vertical
deflection of the electron beam as it emerges from the plates.
8) A straight horizontal rod of length 20 cm and mass 30 gm is placed in a uniform horizontal magnetic field perpendicular to the rod. If a current of 2A through the rod makes it self supporting in the magnetic field, calculate the magnetic field.
9) A long solenoid of 1000 turns and cross sectional area 2×10-3 m2 carries a current of 2A and produces a flux density 52×10-3 T inside it. Calculate the self inductance of the coil.
10) A piano string 1.8 m long is made of steel of density 7800 kg/m3 and Young’s modulus 2× 1011 N/m2. It is maintained at a tension which produced an elastic strain of 1% in the string. Calculate the frequency of transverse vibration of the string when it is vibrating in second mode of vibration.
11) In Young’s double slit experiment, we observe the 10th bright fringe for λ=6000A⁰. What order will be visible if the source of light is replaced by light of wavelength 5000 A⁰?
SET 2
1) Using Biot-Savart law, derive an expression for the magnetic field
2) At a point on the axis due to an infinite long current carrying solenoid.
3) Write down the Boolean algebra and truth table for OR, AND,NOT,NOR and NAND gates.
4) Explain the working of a zener diode as a voltage regulator.
5) Explain the working of a bridge full wave rectifier.
6) What is energy gap in semiconductor?
SET 3
1) Define binding energy. Explain a graph showing the relation between the binding energy per nucleon and mass number.
2) How is magnetic field made radial in a moving coil galvanometer?
3) What is depletion region and barrier potential?
4) Using Biot-Savart law, derive an expression for the magnetic field
5) At a point on the axis due to an infinite long current carrying solenoid.
6) Why is the mass of nucleus slightly less than the mass of constituent’s nucleus?
SET 4
1) Does a nucleus contain electrons? Explain.
2) What do you mean by Hall effect?
3) State Ampere’s theorem.
4) Two thin coherent sources of monochromatic light of wavelength 5000 A⁰ are separated by a distance of 0.2 mm. find the fringe width of the interference pattern formed by them on a screen 1 m away from the sources.
5) In double slit experiment, the slits are 0.3mm apart and interference is observed on a screen placed at a distance 90 cm from the slits. The second dark fringe is 0.3 cm from the central bright fringe. Find the wavelength of light used and the distance of the fourth bright fringe from central bright fringe.
6) A X-ray tube works at a dc potential difference of 50 KV. Only 0.4% of the energy of the cathode rays is converted into X-rays and heat generated in the target at the rate of 600 watt. Estimate the current passed into the tube and the velocity of the electrons striking the target. (Mass of electron=9.1×10-31 Kg, Charge of electron=1.6×10-19 C)
SET 5
1) A beam of light after reflection at a plane mirror rotating 2000 times per minute passes a distant reflector. It returns to a rotating mirror from which it is reflected to make an angle of 1º with the original direction. Assuming that the velocity of light is 3×105 km/s calculate the distance between the mirrors.
2) When light of frequency 5.4×1014 Hz, liberated electrons with energy 2.31×10-19 J from a certain metallic surface. What is the wavelength of ultraviolet light which liberates electron of energy 8.93×10-19J from the same surface?
3) The photoelectric work function of potassium is 2eV and the surface is illuminate with radiation of wavelength 350nm. What potential differences have to be applied between a potassium surface and the collecting electrode in order just to prevent collection of electrons? What would be the kinetic energy of electrons?
4) When ultraviolet light with wavelength of 400 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectron is 1.1 eV. What is the maximum kinetic energy of the photoelectrons when light of wavelength 300nm falls on the same surface?
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