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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
Internal energy of an ideal gas depends on
volume only
pressure only
temperature only
both pressure and volume
The neutral temperature of a thermocouple is equal to when the temperature of cold junction is . Percentage change in the temperature of inversion when temperature of cold junction is equal to is
$2%$
$3%$
$4%$
What is the significance of the negative energy of the electron in an orbit?
The energy levels of an atom are shown in Fig. below. Which one of these transitions will result in the emission of a photon of wavelength ? Explain with calculation.
What will be the angle of the second-order maximum in the second experiment?
Suggest which experiment you think will give the more accurate measurement of wavelength
A physics student went to buy polaroid sunglasses. The shopkeeper gave him two similar-looking sunglasses. In what way can he differentiate between polaroid sunglasses and non-polaroid sunglasses?
In what way does the intensity of sound heard by an observer change if the distance with the source changes by four times?
Define $1$ Ampere of current in terms of force between two parallel current-carrying conductors.
What difference do you expect in the opposition provided by circuits for the current flow in figure (a) and (b) if given a.c. e.m.f. is replaced by its equivalent d.c. e.m.f.?
A magnet is quickly moved in the direction indicated by an arrow between two coils $C_1$ and $C_2$ as shown in the figure. What will be the direction of induced current in each coil as indicated by the movement of magnet? Explain.
State Lenz law in electromagnetism. Justify this law in favor of the principle of conservation of energy.
Compute the current inside the conductor.
Compare the efficiency of petrol engine with that of diesel engine based on their compression ratios.
A polarizer is used to
reduce intensity of light
produce diffracted light
increase intensity of light
produce unpolarized light
Given figure represents decay graph of a radioactive sample of half life 10 years. Estimate the value of T₃.
Draw a PV diagram of a petrol engine and explain its working based on its PV diagram.
The diagram below shows an experiment to measure the speed of a sound in a string. The frequency of the vibrator is $120\ \text{Hz}$. Calculate the speed at which a progressive wave would travel along the string.
What is rectification? Explain full wave rectification using two P-N junction diodes.
Derive an expression for energy stored in an inductor.