A resistance R₁ when connected to a battery produce 500 J of heat in 6 min and an Another resistance R₂ is connected to same battery produce same heat in 12 min. If the both resistance are connected in series, the time taken to produce the same heat is

At what angle should a ray of light be incident on the face of a prism of refracting angle 90∘ so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 5/4.

each battery of 1 V and each resistance of 1 ohm. find the potential at point P.

10¹⁴ number of photons striking on a photoelectric plate of surface area of 5 cm² in every 2 sec. If Intensity of light is 160x10^-3 w/m² and K.E of photoelectron coming out from plate is zero then the work function of photoelectric plate is.

In an experiment 5.00 kg mass of liquid is filled in a container of height 10.0 inch and volume 50.0 inch³.The maximum permissible percentage error in the pressure at the bottom of the container.