Class 12 > PYQ PHYSICS > 2017 > Set 1

2017

History 1 Views

Q1
Does the charge given to a metallic sphere depend on whether it is hollow or solid ? Give reason for your answer

Q2
A long straight current carrying wire passes normally through the center of circular loop. If the current through the wire increases, will there be an induced emf in the loop ? Justify.

Q5
How is the speed of em-waves in vacuum determined by the electric and magnetic fields?

Q6
How does Ampere-Maxwell law explain the flow of current through a capacitor when it is being charged by a battery ? Write the expression for the displacement current in terms of the rate of change of electric flux.

Q7
Define the distance of closest approach. An a-particle of kinetic energy ‘K’ is bombarded on a thin gold foil. The distance of the closest approach is ‘r’. What will be the distance of closest approach for an a-particle of double the kinetic energy ? OR Write two important limitations of Rutherford nuclear model of the atom.

Q8
Find out the wavelength of the electron orbiting in the ground state of hydrogen atom.

Q9
Define the magnifying power of a compound microscope when the final image is formed at infinity. Why must both the objective and the eyepiece of a compound microscope has short focal lengths ? Explain.

Q10
Which basic mode of communication is used in satellite communication ? What type of wave propagation is used in this mode ? Write, giving reason, the frequency range used in this mode of propagation.

2
3
4