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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
Discuss the effect of temperature and pressure on velocity of sound in a gas.
Obtain an expression for the balanced condition of Wheatstone bridge using Kirchhoff's laws.
State Heisenberg's Uncertainty principle.
Why do we prefer a wrench of longer arm over a wrench of shorter arm?
A potentiometer circuit is shown in the figure.
If the total length of potentiometer wire is 4 m and has resistance 10 Ω and the balance point is obtained at a length of 240 cm, calculate the value of unknown emf E.
Use Ampere's circuital law to find the magnetic field due to a straight current carrying conductor.
What is the difference between moment of inertia of a rod about an axis passing through its one end and through its centre perpendicular to its length?
ML²/3
ML²/4
ML²/6
ML²/12
The half life of radon is 3.8 days. Calculate how much radon will be left out of 1024 milligram after 38 days
Define threshold wavelength.
On the basis of Young's double slit experiment, show that dark and bright fringes are equally spaced in interference.
State first law of thermodynamics. Does it follow the principle of conservation of energy? Explain.
What do you mean by current sensitivity and voltage sensitivity?
A Carnot's engine has 25% efficiency with a sink at 9°C. By how many degrees should the temperature of the source be increased in order to raise the efficiency to 50%?
Obtain balanced condition of Wheatstone bridge circuit using Kirchhoff’s laws.
In the given figure, a Carnot engine drives a Carnot refrigerator. Determine Q₂, Q₃ and Q₄.
Obtain decay equation, N = N₀e⁻ˡᵗ, where symbols have their usual meanings.
A metal has a work function of 2 eV. Calculate the maximum speed of the emitted photoelectrons when it is illuminated by radiation of wavelength 150 nm. What is the least frequency of the radiation for which electrons are emitted?
(Given: Planck's constant h = 6.62 × 10⁻³⁴ Js, m = 9.1 × 10⁻³¹ kg, e = 1.6 × 10⁻¹⁹ C)
The torque due to the gravitational force on a body about its centre of mass is:
finite
infinite
zero
not measurable
A gas undergoes a cyclic process ABCDA as shown in figure. The part ABC of process is semicircular. The work done by the gas is:
400π J
1200π J
2456 J
200π J
If refractive index of a glass is 1.5, what will be its polarizing angle?
65.3°
56.3°
45°
42.3°