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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
Analyze the given graph and name the type of material represented by graph A and graph B
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.
Draw free body diagram of oil drop falling through air in Millikan's oil drop experiment for both cases, when field is given and when field is absent. What is the conclusion of this experiment?
State and explain Lenz's law.
"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.
What is factor affecting radius of gyration of a body?
Angular speed
Axis of rotation
Angular acceleration
Acceleration due to gravity
The length of a pendulum is increased by 1%. By what percentage of the period of the motion increases?
9.8%
10%
11%
21%
A cork rises from the bottom of the water and finally floats in water. Its graphical representation will be:
A bar magnet falls through a metal ring, will its acceleration be equal to g? Justify your answer.
A diode as a rectifier converts
Varying dc into constant dc
dc into ac
High voltage into low voltage
ac into dc
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.
Which one curve in Fig. (b) has more value of decay constant? Justify.
Describe the various modes of vibration of the air column in a closed organ pipe.
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
A coil has a resistance of 8Ω and an inductive reactance 6Ω. What will be the impedance?
6Ω
8Ω
10Ω
14Ω
What is the distance between node and antinode in a stationary wave in terms of wavelength?
λ/2
λ/4
λ
2λ
According to Faraday's law of electromagnetic induction, induced emf
ε = −N dΦ/dt. What does the negative sign indicate?