CBSE - XII Physics 2007 Question Paper

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CBSE Examination 2009

CBSE - XII Physics 2007 Question Paper

Author: deepa mittal

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Physics

Time allowed : 3 hours

Maximum Marks : 70

General Instructions :

All questions are compulsory.
There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and one question of five marks. You have to attempt only one of the choices in such questions.
Question numbers 1 to 5 are very short answer type questions, carrying one mark each.
Question numbers 6 to 12 are short answer type questions, carrying two marks each.
Question numbers 13 to 24 are also short answer type questions, carrying three marks each.
Question numbers 25 to 27 are long answer type questions, carrying five marks each.
Use of calculators is not permitted. However, you may use log tables, if necessary.
You may use the following values of physical constants wherever necessary :

$c=3*10^8ms^{-1}$

$h=6.6*10^{-34}Js$

$e=1.6*10^{-19}C$

$\mu_0=4\pi*10^{-7}TmA^{-1}$

$m_e=9.1*10^{-31}Kg$

$\cfrac {1}{4\pi\varepsilon_0}=9*10^9N-m^2/C^2$

Mass of neutron $m_n\cong 1.6*10^{-27}kg$

Boltzmann's constant $k=1.38*10^{-23}JK^{-1}$

Avogadro's number $N_A=6.023*10^{23}/mole$

QUESTION PAPER CODE 55/1/1

An electron, an alpha-particle and a proton have the same kinetic energy. Which one of these particles has the largest de-Broglie wavelength ?
Why should the material used for making permanent magnets have high coercivity ?
The radioactive isotope D decays according to the sequence

$D \quad \dfrac {\beta^-}{}$ $\dfrac {\alpha -particle}{}$

If the mass number and atomic number of D2 are 176 and 71 respectively, what is (i) the mass number (ii) atomic number of D ?
What will be the values of input A and B for the Boolean expression

$(\overline{A+B})$ $.(\overline{A.B})=1?$
Why is frequency modulation perferred over amplitude modulation for transmission of music ?
The output of an OR gate is connected to both the inputs of a NAND gate. Draw the logic circuit of this combination of getes and write its truth table.
Draw a plot of potential energy of a pair of nucleons as a function of their separation. What is the significance of negative potential energy in the graph drawn ?
A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index $\frac {4}{3}$ .
Distinguish between the terms 'average value' and 'rms value' of an alternating current. The instantaneous current from an a.c. source is I = 5 sin (314 t) ampere. What are the average and rms values of the current ?
Write the relation for the force $\vec F$ acting on a charge carrier q moving with a velocity $\vec v$ through a magnetic field $\vec B$ in vector notation. Using this relation, deduce the conditions under which this force will be (i) maximum (ii) minimum.