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PHYSICS – IMPORTANT QUESTION BANK
Deduce Ohm’s law from elementary ideas and hence write an expression for resistance and resistivity
State and explain Faraday’s laws f electromagnetic induction.
ln Young’s double-slit experiment the slits are separated by 0.28 mm and the screen is placed at a distance of 1 .4 m away from the slits. The distance between the central bright fringe and the fifth dark fringe is measured to be 1.35 cm. Calculate the wavelength of the light used. Also find the fringe width if the screen is moved 0.4 m towards the silts, for the same experimental setup.
Distinguish between resistance, reactance and impedance and impedance
Compare the properties f electromagnetic waves and mechanical waves
Draw a ray diagram t show the image formation in refracting type astronomical telescope in the near pint adjustment (when image is formed at LDDV i.e. D= 25cm). Derive an expression for its magnifying power why the diameter f objective f telescope should be large.
Explain Polarization of light. Give any one method t produce plane polarized light.
For which angle of incidence reflected ray is completely polarized?
An inductor and a bulb are connected in series to an AC source of 220 V, 50 Hz. A current of 11A flows in the circuit and phase angle between voltage and current is π Calculate the impedance and inductance of the circuit
State Kirchhoff’s laws of an electrical network.
Obtain an expression for potential energy of a system of two charges in free space in the absence of an external electric field.
Explain with the help f a circuit diagram, how the thickness of depletion layer in a p-n junction diode changes when it is forward biased.
State Gauss law in electrostatics and obtain an expression for electric field at a pint due to an infinitely long straight uniformly charged thin wire.
A convex lens of focal length 0.24 m and of refractive index 1.5 is completely immersed in water of refractive index 1.33. find the change in focal length of the lens.
With a neat circuit diagram, explain the working f a transistor as a switch.
Write Coulomb’s law in vector form. Explain the terms.
Write three experimental observations of the photoelectric effect.
State and explain De-Broglie relation for matter waves. Describe Davisson- Germer experiment which provided experimental evidence for wave nature of matter.
Explain the inadequacy of Ampere’s circuital law.
A uniform copper wire f length 2m and cross-sectional area 5×10-7 m2 carries a current f 2A. Assuming that there are 8×1028 free electrons per m3 f copper, calculate the drift velocity f electrons. How much times will an electron take to drift from one end of the wire to the there? (Give charge n an electron e= 1.6×10-19 C).
Write Einstein’s photoelectric equation state clearly the three salient features observed in photoelectric effect which can be explained n the basis of basis of above equation.
A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?
Derive the relation for equivalent focal length or power when two thin lenses are placed in contact t each other. In which condition the lens combination will act as a plane glass sheet.
Define wave front state Huygens principle and verify Snell’s law State the principle of Huygens and prove the law of reflection on the basis of wave theory
By assuming Bohr’s postulates derive an expression for the radius of nth orbit of an electron, revolving around the nucleus of a hydrogen atom.
Obtain the expression for the effective emf and the effective internal resistance of two cells connected in parallel such that the currents are flowing in the same direction.
Show the variation of photocurrent with collector plate potential for different intensities but same frequency of incident radiation.
Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400mm.
Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is 81m tall. How much service area can it cover if the receiving antenna is at the ground level?
Write notes on LED, photodiode and solar cell
What is hysteresis? Define the terms ‘coercively’ and ‘retentively’ of a ferromagnetic material.
Explain how the fundamental logic gates can be realized using NAND gates alone.
What is radial magnetic field? What is it is importance in a moving coil galvanometer? How is a radial magnetic field realized in moving coil galvanometer?
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