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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
Which of the following represents the process of production of emf by maintaining a difference of temperature between the two junctions of a loop of two dissimilar metals?
Seebeck effect
Joule effect
Peltier effect
Thomson effect
A cork rises from the bottom of the water and finally floats in water. Its graphical representation will be:
Which portion of the given figure represents the coercivity?
CD
AD
AG
AE
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 disc having moment of inertia 10 kg m² about its center rotates steadily with angular velocity of 20 rad s⁻¹. Find:
i) Rotational kinetic energy
ii) Number of revolution per second
The angular velocity of the earth around the sun increases when it comes closer to the sun, why?
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
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
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.
What is the distance between node and antinode in a stationary wave in terms of wavelength?
λ/2
λ/4
λ
2λ
Analyze the given graph and name the type of material represented by graph A and graph B
Obtain Laplace's formula for velocity of sound in air starting from Newton's formula
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?
A petrol engine consumes 10 kg of petrol in one hour. The calorific value of petrol is 1.14 × 10⁴ cal g⁻¹. The power of the engine is 30 kW. Calculate the efficiency of the engine.
An oil drop carrying a charge q has a mass m kg. It is falling freely in air with terminal velocity v, the electric field required to make the drop move upward with the same speed is
mg / q
2mg / q
mgv / q²
2mgv / q
The fundamental frequency for a particular organ pipe is 330 Hz. The pipe is closed at one end but open at the other. What is the frequency of its second mode?
110 Hz
165 Hz
660 Hz
990 Hz