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Title: 12th class physics paper
Description: this is a question paper to check your skills
Description: this is a question paper to check your skills
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PHYSICS (Theory)
Time allowed: 3 Hours
Maximum Marks: 70
General Instructions:
(i) All questions are compulsory
...
Questions 1 to 8 carry one mark each, questions 9 to 18 carry two marks each,
questions 19 to 27 carry three marks each and questions 28 to 30 carry five marks each
...
However, an internal choice has been provided in one question of two marks, one
question of three marks and all three questions of five marks each
...
(iv) Use of calculators is not permitted
...
626 x 10-34Js
e = 1
...
675 x 10-27 kg
Boltzmann’s constant k = 1
...
022 x 1023 / mol-1
1
...
What is the stopping potential of a photocell, in which electrons with maximum kinetic energy of 6 eV are
emitted?
3
...
4
...
5
...
What is the nuclear radius of 125Fe, if that of 27Al is 3
...
When current in a coil changes with time, how is the back emf induced in the coil related to it?
8
...
Where is the image formed?
9
...
0
V
3
...
0
2
...
(ii) For what current I, will the power dissipation of the current be maximum?
10
...
If N0 is the number of radioactive nuclei in the sample at some initial time
t0, find out the relation to determine the number N present at a subsequent time
...
OR
Draw a plot of the binding energy per nucleon as a function of mass number for a large number of nuclei
...
Write a typical nuclear relation in
which a large amount of energy is released in the process of nuclear fission
...
In the figure given below, light rays of blue, green, red wavelengths are incident on an isosceles right-angled
prism
...
The refractive index of the
prism for red, green, blue light ate 1
...
476 respectively
...
Two wires X, Y have the same resistivity, but their cross-sectional areas in the ratio 2:3 and lengths in the ratio
1:2
...
c source
...
13
...
14
...
A jet plane is traveling west at 450 ms-1
...
16
...
17
...
What should be the peak voltage of the modulating signal, in
order to have a modulation index of 80%
...
Derive an expression for the torque acting on an electric dipole, which is held in a uniform electric field, when
the axis of the dipole makes an angle θ with the electric field
...
Draw a plot showing the variation of power of a lens with the wavelength of the incident light
...
5 and of focal length 20 cm in air has the same radii of curvature for both
sides
...
7, calculate the focal length of the lens in the liquid
...
If a particle of charge q is moving with velocity v along the z-axis and the magnetic field B is acting along the
x-axis, use the expression F = q (v x B) to find the direction of the force F acting on it
...
If the magnitudes of the electric and
magnetic fields are 50 KV/m and 50 m T respectively, calculate
(i) Velocity v of the beam
(ii) Force with which it strikes a target on a screen, if the proton beam current is equal to 0
...
21
...
22
...
23
...
Give one example for each species
...
How long will it take the activity to reduce to 3
...
Two signals A, B as given below, are applied as input to (i) AND (ii) NOR (iii) NAND gates
...
Input A
0
t1
t2
t3
t4
t5
t6
t7
t8
t1
t2
t3
t4
t5
t6
t7
t8
Input B
0
25
...
Give typical examples, with the help of a suitable figure, of communication systems that use space
mode propagation
...
A resistance R = 5 is connected to one of the gaps in a meter bridge, which uses a wire of length 1 m
...
The balance point is notices at
‘l’ cm from the positive end of the battery
...
Neglecting the end correction; calculate the value of unknown resistance X used
...
Draw a labeled circuit diagram of a full wave rectifier and briefly explain its working principle
...
Briefly explain, how
the input/output signals differ in phase by 180°
...
(a) Derive an expression for the energy stored in a parallel plate capacitor C, charged to a potential difference
V
...
For a supply of 300 V, determine the charge and
voltage across C4
...
Draw a labeled schematic sketch and write
briefly its working
...
The dielectric strength
of the gas surrounding the electrode is 5 x 107 V m-1
...
Draw a labeled ray diagram of a compound microscope and write an expression for its magnifying power
...
25 cm respectively
...
(i) How far from the objective lens will the object be kept, so as to obtain the
final image at the near point of the aye? (ii) Also calculate its magnifying power
...
An astronomical telescope uses an objective lens of focal length 15 cm and eye-lens of focal length 1 cm
...
5 x 106 m and Radius of lunar orbit = 3
...
State the condition for resonance to occur in a series LCR a
...
Draw a plot showing the variation of the peak current (im) with frequency of the a
...
Define the quality
factor, Q of the circuit
...
c circuit
...
Explain
the underlying principle and working of a step-up transformer
...
How much current is drawn by the primary coil of a transformer which steps down 220 V to 22 V to operate device
with an impendence of 220 ohm?
Title: 12th class physics paper
Description: this is a question paper to check your skills
Description: this is a question paper to check your skills