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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
Write the components of forces acting on the body by drawing free body diagram.
Which of the earthquake waves is first recorded on the seismograph?
P-waves
Rayleigh waves
S-waves
Love waves
During forward biasing of p-n junction diode, the width of depletion layer decreases. Justify.
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.
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
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
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
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.
How does resonance occur in above LCR circuit? Write the required expression.
Calculate the impedance of the circuit if
L = 60 mH, C = 0.50 μF and R = 300 Ω.
Identify, which device is X? Also, write the expression for its reactance.
Can a room be cooled by leaving the door of an electric refrigerator open? Justify.
Apply Huygen’s principle to verify the law of reflection of light.
Why side BC does not experience force? Explain.
Define one ampere current on the basis of the force between parallel current carrying conductors.
What is the nature of force in this case?