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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
How can you convert a galvanometer into an ammeter of suitable range?
Obtain an expression for the magnetic field intensity at any point due to a straight current carrying conductor using Ampere's circuital law.
A wire of length 0.5 m carrying a current of 2 A is placed in a uniform magnetic field of strength 0.4 T. Find the maximum and minimum force experienced by it.
Explain quantization of charge.
Why are X-rays used in Millikan's oil drop experiment?
Define the terms half life and mean life of a radioactive substance.
If 2 gm of a radioactive material having half life period of 50 years disintegrates, find out mean life of the given sample.
For the digital circuit given below write the truth table showing the outputs A′, B′ and Y for all possible inputs A and B.
Identify the thermodynamic processes represented by I, II, III and IV.
A slice of indium antimonide 2.5 mm thick carries a current of 150 mA. A magnetic field of flux density 0.5 T, correctly applied, produces a maximum Hall voltage of 8.75 mV between the edges of the slice. Calculate the number of free charge carriers per unit volume assuming they each have a charge of −1.6 × 10⁻¹⁹ C.
If the current determined in part (i) is passed through a 100-turn coil of $100\ cm^2$ area with its axis held perpendicular to the magnetic field of flux density $10\ T$, how much torque is produced?
In Meter Bridge shown below, the null point is found at a distance of $60.0\ \text{cm}$ from A. If now a resistance of $5\ \Omega$ is connected in series with $S$, the null point occurs at $50\ \text{cm}$. Determine the values of $R$ and S.
When the wire of a sonometer is $75\ \text{cm}$ long, it is in resonance with a tuning fork. On shortening the wire by $0.5\ \text{cm}$ it makes 3 beats with the same fork. The beat is the difference in frequencies. Calculate the frequency of the tuning fork.
Determine the electric field supplied when the electric force applied between the two horizontal plates just balances an oil drop with 4 electrons attached to it and mass of oil drop is $1.3 \times 10^{-14}\ \text{kg}$.
What will be the time period of this system if it is taken inside the satellite?
Why laminated cores are placed in transformers?
to reduce hysteresis loss
to reduce eddy current
to reduce the magnetic effect
to increase coercivity
Define simple harmonic motion.
Derive an expression for the time period of oscillation for a mass $m$ attached to a vertical spring of force constant $k$.
In which of the following circuits the maximum power dissipation is observed?
a circuit having inductor and resistor in series
pure resistive circuit
pure inductive circuit
pure capacitive circuit
The diagram shows a standing wave in an open organ pipe.
i) Redraw the diagram and show the position of nodes and antinodes.
ii) Derive an expression for frequency of this mode.