shine your concept

• .25 m

• .5 m

• 1 m

• none of these

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

• 4 min

• 18 min

• 9 min

• data insufficient

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.

• sin^-13/4

• sin^-14/3

• sin^-14/5

• sin^-15/4

• 3 mm

• 6 mm

• 1 mm

• 2 mm

• 0.25J/m/s^oC

• 2.25J/m/s^oC

• 1.24J/m/s ^oC

• 3.24J/m/s^oC

• 1

• 2

• 3

• 4

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

• 4/7

• 4/9

• 5/7

• 5/9

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.

• 2 ev

• 1.5 ev

• 1 ev

• none of these

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.

• 1.2 %

• 1.4%

• 1.6%

• none of these