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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
Define θₙ and θᵢ.
Write the postulates of Bohr’s atomic model.
The given figure represents a wavefront AB moving in air and incident on a plane glass surface XY. Its position after refraction through the glass slab is CD. The refractive index of glass with respect to air will be equal to:
AB/CD
BD/AD
AC/AD
BD/AC
If the tension of the string is increased 4 times, what will be the frequency of this mode?
Obtain Laplace’s corrected formula.
The frequency of tuning fork is 384 Hz and velocity of sound in air is 352 m/s. How far has the sound travelled while fork completes 36 vibrations?
33 m
36 m
352 m
72 m
A ray of light strikes a glass plate at an angle of incidence 60°. If the reflected and refracted rays are perpendicular to each other at interface, what is the refractive index of glass?
1/√3
√3/2
2/√3
√3
Define angular momentum. Write its SI unit.
A Carnot engine is working between 300K and 600K and has output 200J. What is the energy supplied to the engine?
400 J
800 J
1200 J
1600 J
A particle undergoes SHM having time period T. What is the time taken by it to move from mean position to half of amplitude?
T/12
T/3
T/6
T/2
The speed of a motor engine decreases from 900 rev/min to 600 rev/min in 10 seconds. Calculate:
i. Angular acceleration
ii. Number of revolutions made by the motor during this interval
iii. How many additional seconds are needed for motor to come to rest in the same rate
An ideal liquid is taken through series of changes represented in diagram. The work done by the gas at the end of cycle is:
P₁V₁
5P₁V₁
10P₁V₁
Zero
What happens to the susceptibility of ferromagnetic substance if temperature is decreased?
Increases
Decreases
Remains same
May increase or decrease
Draw graphs showing the variation of voltage and current with time over one cycle of an alternating current for X.
Identify, which device is X? Also, write the expression for its reactance.
Calculate the impedance of the circuit if
L = 60 mH, C = 0.50 μF and R = 300 Ω.
Define impedance of LCR circuit.
How does resonance occur in above LCR circuit? Write the required expression.
Define one ampere current on the basis of the force between parallel current carrying conductors.
What is the nature of force in this case?