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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
For a simple pendulum, show that the acceleration is directly proportional to the displacement of bob from its mean position.
A bob of mass 8 kg performs SHM of amplitude 30 cm. The restoring force is 60 N. Calculate:
i. Time period
ii. Maximum acceleration
iii. Kinetic energy when displacement is 12 cm
Which of the earthquake waves is first recorded on the seismograph?
P-waves
Rayleigh waves
S-waves
Love waves
What happens to the susceptibility of ferromagnetic substance if temperature is decreased?
Increases
Decreases
Remains same
May increase or decrease
What is the induced emf in a coil if the flux associated with it changes at the rate of 1 Weber per minute?
1 Volt
1/60 Volt
60 Volt
Zero
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
Write the components of forces acting on the body by drawing free body diagram.
Effect of increasing frequency on stopping potential
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
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
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
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
How does resonance occur in above LCR circuit? Write the required expression.
Identify, which device is X? Also, write the expression for its reactance.
Velocity-time graph:
Define angular momentum. Write its SI unit.
Conclude with reason, where the balance point will be shifted, towards A or B, when:
i. Resistance R is increased, keeping all other parameters constant.
ii. Resistance S is decreased, keeping R constant.
Draw graphs showing the variation of voltage and current with time over one cycle of an alternating current for X.
Which of the following is the phenomenon of production of emf by maintaining a difference of temperature between two junctions of dissimilar metals?
Joule’s effect
Seebeck effect
Peltier effect
Thomson’s effect