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Q.The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping? Q.Define the activity of a given radioactive substance. Write its S.I unit. Q. Where on the surface of the earth is the angle of dip 90° Q. How are radio waves produced? Q. Write any two characteristic properties of nuclear force? Q. What happens to the width of the depletion layer of a p-n junction when it is (i) forward biased or (ii) reverse biased? Q. Define the term ‘stopping potential’ in relation to photoelectric effect? Q.The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping Q.Define the activity of a given radioactive substance. Write its S.I unit Q.Welders wear special goggles or face masks with glass windows to protect their eyes from electromagnetic radiations.Name the radiations and write the range of their frequency Q:A charged particle enters a magnetic field region in a direction perpendicular to the direction of the magnetic field. Will there be any change in the particle’s (i) kinetic energy (ii) momentum Q: Draw a labelled ray diagram to show the formation of an image by a compound microscope. Write the expression for its magnifying power. Q:How does the resolving power of a compound microscope change, when (i) refractive index of the medium between the object and the objective lens increases; and (ii) wavelength of the radiation used is increased? Q:Which two main considerations are kept in mind while designing the ‘objective’ of an astronomical telescope? Obtain an expression for the angular magnifying power and the length of the tube of an astronomical telescope in its (a) normal adjustment’ position. Q:Give the principle of working of a Van de Graff generator. With the help of a labelled diagram, describe its construction and working. How is the leakage of charge minimised from the generator? Q:Define the term 'resolving power' of an astronomical telescope. How does it get affected oN increasing the aperture of the objective lens? Q:Increasing the wavelength of the light used? Justify your answer in each case. Q:State the principle of potentiometer. Draw a circuit diagram used to compare the e.m.f. of two primary cells. Q:Write the formula used. How can the sensitivity of a potentiometer be increased? Q:What is meant by 'drift velocity of free electrons'? Q:Derive Ohm's law on the basis of the theory of electron. Q:Explain, with the help of a schematic diagram, the principle and working of a Light Emitting Diode. What criterion is kept in mind while choosing the semiconductor material for such a device? Q:Write any two advantages of Light Emitting Diode over conventional incandescent lamps. Q:Write any four characteristics of electromagnetic waves. Give two uses each of Radio-waves and Micro-waves. Q:State the laws of radioactive decay. Establish a mathematical relation between half-life period and disintegration constant of a radioactive nucleus. Q:How is the mutual inductance of a pair of coils affected when separation between the coils is increased? the number of turns of each coil is increased ? a thin iron sheet is placed between the two coils, other factors remaining the same? Explain your answer in each case. Q:What are eddy currents. How are these produced? In what sense are eddy currents considered undesirable in a transformer and how are these reduced in such a device? Q:On the basis of the energy band diagrams distinguish between metals, insulators and semiconductors. Q:An electric dipole is held in a uniform electric field. (a) Using suitable diagram, show that it does not undergo any translatory motion and (ii) derive an expression for the torque acting on it and specify its direction. Q:What is Wheatstone bridge? Deduce the condition for which Wheatstone bridge is balanced. Identify the two specimens X and Y (b) State the reason for the behaviour of the field lines in X and Y. Q: A pure inductor is connected across an a.c. source. Show mathematically that the current in it lags behind the applied emf by a phase angle of p/2. What is its inductive reactance? Draw a graph showing the variation of inductive reactance with the frequency of the a.c. source. Q:Distinguish between analogue and digital communication. Write any two modulation techniques employed for the digital data. Describe briefly any one of the techniques used. Q:Define the terms threshold frequency and stopping potential in relation to the phenomenon of photoelectric effect. How is the photoelectric current affected on increasing the frequency intensity of the incident radiations and why? Q:Draw a schematic diagram of a single optical fibre structure. On what principle does such a device work? Q:Explain the mechanism of propagation of light signal through an optical fibre. (a) Draw the block diagram of a communication system. (b) What is meant by ‘detection’ of a modulated carrier wave? Describe briefly the essential steps for detection. Q:Give reasons for the following : Astronomers prefer to use telescopes with large objective diameters to observe astronomical objects. Q:Two identical but independent monochromatic sources of light cannot be coherent. Q:The value of the Brewster angle for a transparent medium is different for lights of different colours. Q:Name the reaction which takes place when a slow neutron beam strikes 92U235 nuclei. Write the nuclear reaction involved. Q:Define the terms 'Magnetic Dip' and 'Magnetic Declination' with the help of relevant diagrams. Q:Define 'electric line of force' and give its important properties. Q:State the condition under which the phenomenon of resonance occurs in a series LCR circuit. Plot a graph showing variation of current with frequency of a.c. source in a series LCR circuit. Q:How does the resistivity of a conductor and a semiconductor vary with temperature? Give reason for each case. Q:Explain how the width of depletion layer in a p-n junction diode changes when the junction is forward biased reverse biased. Q:Define resolving power of a compound microscope. Q:How does the resolving power of a compound microscope change when refractive index of the medium between the object and objective lens increases? Wavelength of the radiation used is increased? Q:Write the relation for the force acting on a charge carrier q moving with a velocity through a magnetic field in vector notation. Using this relation, deduce the conditions under which this force will be maximum minimum. Q:You are given ‘a’ resistors, each of resistance ‘r’. These are first connected to get minimum possible resistance. In the second case, these are again connected differently to get maximum possible resistance. Compute the ratio between the minimum and maximum values of resistance so obtained. Q:Draw a circuit diagram using a metre bridge and write the necessary mathematical relation used to determine the value of an unknown resistance. Why cannot such an arrangement be used for measuring very low resistances? Q:What does the term LOS communication mean? Q:Name the types of waves that are used for this communication. Which of the two-height of transmitting antenna and height of receiving antenna can affect the range over which this mode of communication remains effective? Q:Draw a ray diagram to show the refraction of light through a glass prism. Hence obtain the relation for the angle of deviation in terms of the angle of incidence, angle of emergence and the angle of the prism. Q:We do not choose to transmit an audio signal by just directly converting it to an e.m. wave of the same frequency. Give two reasons for the same. Q:State Bohr’s postulate for the ‘permitted orbits’ for the electron in a hydrogen atom. Use this postulate to prove that the circumference of the nth permitted orbit for the electron can ‘contain’ exactly n wave lengths of the de Broglie wavelength associated with the electron in that orbit. Q:What is photoelectric effect? Drive Einstein’s photoelectric equation. Q:Explain the essential difference between interference and diffraction. Q:What is the basic difference between the atom or molecule of a diamagnetic and a paramagnetic material? Q:Why are elements with even atomic number more likely to be diamagnetic?

Q.The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping?
Q.Define the activity of a given radioactive substance. Write its S.I unit.
Q. Where on the surface of the earth is the angle of dip 90°

Q. How are radio waves produced?
Q. Write any two characteristic properties of nuclear force?
Q. What happens to the width of the depletion layer of a p-n junction when it is (i) forward biased or (ii) reverse biased?
Q. Define the term ‘stopping potential’ in relation to photoelectric effect?
Q.The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping
Q.Define the activity of a given radioactive substance. Write its S.I unit
Q.Welders wear special goggles or face masks with glass windows to protect their eyes from electromagnetic radiations.Name the radiations and write the range of their frequency

Q:A charged particle enters a magnetic field region in a direction perpendicular to the direction of the magnetic field. Will there be any change in the particle’s (i) kinetic energy (ii) momentum
Q: Draw a labelled ray diagram to show the formation of an image by a compound microscope. Write the expression for its magnifying power. Q:How does the resolving power of a compound microscope change, when (i) refractive index of the medium between the object and the objective lens increases; and (ii) wavelength of the radiation used is increased?
Q:Which two main considerations are kept in mind while designing the ‘objective’ of an astronomical telescope? Obtain an expression for the angular magnifying power and the length of the tube of an astronomical telescope in its (a) normal adjustment’ position.
Q:Give the principle of working of a Van de Graff generator. With the help of a labelled diagram, describe its construction and working. How is the leakage of charge minimised from the generator?
Q:Define the term 'resolving power' of an astronomical telescope. How does it get affected oN increasing the aperture of the objective lens?
Q:Increasing the wavelength of the light used? Justify your answer in each case.

Q:State the principle of potentiometer. Draw a circuit diagram used to compare the e.m.f. of two primary cells. Q:Write the formula used. How can the sensitivity of a potentiometer be increased?
Q:What is meant by 'drift velocity of free electrons'? Q:Derive Ohm's law on the basis of the theory of electron.
Q:Explain, with the help of a schematic diagram, the principle and working of a Light Emitting Diode. What criterion is kept in mind while choosing the semiconductor material for such a device?
Q:Write any two advantages of Light Emitting Diode over conventional incandescent lamps.
Q:Write any four characteristics of electromagnetic waves. Give two uses each of Radio-waves and Micro-waves.

Q:State the laws of radioactive decay. Establish a mathematical relation between half-life period and disintegration constant of a radioactive nucleus.
Q:How is the mutual inductance of a pair of coils affected when separation between the coils is increased?
the number of turns of each coil is increased ?
a thin iron sheet is placed between the two coils, other factors remaining the same? Explain your answer in each case.

Q:What are eddy currents. How are these produced? In what sense are eddy currents considered undesirable in a transformer and how are these reduced in such a device?
Q:On the basis of the energy band diagrams distinguish between metals, insulators and semiconductors.
Q:An electric dipole is held in a uniform electric field. (a) Using suitable diagram, show that it does not undergo any translatory motion and (ii) derive an expression for the torque acting on it and specify its direction.
Q:What is Wheatstone bridge? Deduce the condition for which Wheatstone bridge is balanced.
Identify the two specimens X and Y (b) State the reason for the behaviour of the field lines in X and Y.
Q: A pure inductor is connected across an a.c. source. Show mathematically that the current in it lags behind the applied emf by a phase angle of p/2. What is its inductive reactance? Draw a graph showing the variation of inductive reactance with the frequency of the a.c. source.
Q:Distinguish between analogue and digital communication. Write any two modulation techniques employed for the digital data. Describe briefly any one of the techniques used.
Q:Define the terms threshold frequency and stopping potential in relation to the phenomenon of photoelectric effect. How is the photoelectric current affected on increasing the frequency intensity of the incident radiations and why?

Q:Draw a schematic diagram of a single optical fibre structure. On what principle does such a device work? Q:Explain the mechanism of propagation of light signal through an optical fibre.
(a) Draw the block diagram of a communication system. (b) What is meant by ‘detection’ of a modulated carrier wave? Describe briefly the essential steps for detection.
Q:Give reasons for the following :
Astronomers prefer to use telescopes with large objective diameters to observe astronomical objects.
Q:Two identical but independent monochromatic sources of light cannot be coherent.
Q:The value of the Brewster angle for a transparent medium is different for lights of different colours.


Q:Name the reaction which takes place when a slow neutron beam strikes 92U235 nuclei. Write the nuclear reaction involved.
Q:Define the terms 'Magnetic Dip' and 'Magnetic Declination' with the help of relevant diagrams.
Q:Define 'electric line of force' and give its important properties.
Q:State the condition under which the phenomenon of resonance occurs in a series LCR circuit. Plot a graph showing variation of current with frequency of a.c. source in a series LCR circuit. Q:How does the resistivity of
a conductor and
a semiconductor vary with temperature? Give reason for each case.
Q:Explain how the width of depletion layer in a p-n junction diode changes when the junction is
forward biased
reverse biased.
Q:Define resolving power of a compound microscope. Q:How does the resolving power of a
compound microscope change when
refractive index of the medium between the object and objective lens increases?
Wavelength of the radiation used is increased? Q:Write the relation for the force acting on a charge carrier q moving with a velocity through a magnetic field in vector notation. Using this relation, deduce the conditions under which this force will be
maximum
minimum.
Q:You are given ‘a’ resistors, each of resistance ‘r’. These are first connected to get minimum possible resistance. In the second case, these are again connected differently to get maximum possible resistance. Compute the ratio between the minimum and maximum values of resistance so obtained.
Q:Draw a circuit diagram using a metre bridge and write the necessary mathematical relation used to determine the value of an unknown resistance. Why cannot such an arrangement be used for measuring very low resistances?
Q:What does the term LOS communication mean? Q:Name the types of waves that are used for this communication. Which of the two-height of transmitting antenna and height of receiving antenna can affect the range over which this mode of communication remains effective?
Q:Draw a ray diagram to show the refraction of light through a glass prism. Hence obtain the relation for the angle of deviation in terms of the angle of incidence, angle of emergence and the angle of the prism.
Q:We do not choose to transmit an audio signal by just directly converting it to an e.m. wave of the same frequency. Give two reasons for the same.
Q:State Bohr’s postulate for the ‘permitted orbits’ for the electron in a hydrogen atom. Use this postulate to prove that the circumference of the nth permitted orbit for the electron can ‘contain’ exactly n wave lengths of the de Broglie wavelength associated with the electron in that orbit.
Q:What is photoelectric effect? Drive Einstein’s photoelectric equation.
Q:Explain the essential difference between interference and diffraction.
Q:What is the basic difference between the atom or molecule of a diamagnetic and a paramagnetic material? Q:Why are elements with even atomic number more likely to be diamagnetic?

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1 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
10 months ago
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