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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
During forward biasing of p-n junction diode, the width of depletion layer decreases. Justify.
How does resonance occur in above LCR circuit? Write the required expression.
How can a spherical wave front be changed into plane wavefront? Draw a diagram to justify your answer.
Write the truth table for the combination of gates given in the figure below.
Determination of Planck’s constant from graph
A coil has a resistance of 8Ω and an inductive reactance 6Ω. What will be the impedance?
6Ω
8Ω
10Ω
14Ω
A diode as a rectifier converts
Varying dc into constant dc
dc into ac
High voltage into low voltage
ac into dc
Which one curve in Fig. (b) has more value of decay constant? Justify.
Time taken by light to cross a glass slab of thickness 5 cm and refractive index of 1.5 will be:
0.2 ns
0.25 ns
0.3 ns
0.35 ns
In which of the following thermodynamic process of the gas, workdone is minimum?
Isothermal
Adiabatic
Isobaric
Isochoric
Obtain Laplace's formula for velocity of sound in air starting from Newton's formula
Apply first law of thermodynamics to obtain the relation Cₚ − Cᵥ = R, where symbols have their usual meanings.
What is the distance between node and antinode in a stationary wave in terms of wavelength?
λ/2
λ/4
λ
2λ
A circular coil of radius R is carrying a constant current I. Find an expression for magnetic field at point P, which is at a distance x on its axial line.
What is factor affecting radius of gyration of a body?
Angular speed
Axis of rotation
Angular acceleration
Acceleration due to gravity
"The bright and dark fringes are equally spaced." Justify this statement from Young's double slits experiment.
State and explain Bragg's law of X-ray diffraction.
The length of a pendulum is increased by 1%. By what percentage of the period of the motion increases?
9.8%
10%
11%
21%
Describe the various modes of vibration of the air column in a closed organ pipe.
A cork rises from the bottom of the water and finally floats in water. Its graphical representation will be:
