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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
A positive amount of thermal energy Q is transferred to an ideal gas from its surroundings. The internal energy of the gas increases and the gas does a positive amount of work W on its surroundings. The change of state of the gas is:
Isochoric
Isobaric
Isothermal
Adiabatic
A liquid neither rises nor falls in a capillary tube. The angle of contact is:
0°
Less than 90
90°
Greater than 90°
A ballet dancer sometimes stretches and sometimes folds her arms during her performance, why? Justify.
The torque due to the gravitational force on a body about its centre of mass is:
finite
infinite
zero
not measurable
For a simple pendulum, the graph between l and T² comes out to be:
straight line
parabola
hyperbola
circular
In Thomson's method for determining specific charge of an electron, why is the electric field kept perpendicular to magnetic field? Justify.
What are stationary waves? Prove that the distance between two consecutive nodes in it is equal to half of the wavelength.
Explain the full wave rectification using two P-N junction diodes.
Write the symbol and truth table of NAND gate.
A square coil of area 10⁻² m² is placed perpendicular to a uniform magnetic field of intensity 10³ T. What is the magnetic flux through the coil?
100 Weber
10 Weber
10⁻³ Weber
10⁻⁵ Weber
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
Plot a graph to show the variation of induced emf in a coil rotating in a uniform magnetic field with time.
Derive an expression for the energy stored in an inductor.
State Lenz's law.
State the two Kirchhoff's laws of electrical circuit.
Two spherical rain drops of equal size are falling vertically downward with terminal velocity of 0.15 m/s. What would be the terminal velocity if these drops were combined to form a larger drop?
0.15 m/s
0.24 m/s
0.31 m/s
0.48 m/s
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.
If refractive index of a glass is 1.5, what will be its polarizing angle?
65.3°
56.3°
45°
42.3°
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