A science student takes 100 observations in an experiment Second time he takes 500 observations in the same experiment By doing so the possible error becomes
Inspite of different dispersion, all the wavelengths arrive at the other end of the fibre at the same time. With a step-index fibre overall time difference may be about
Two charges are separated by 0.5 m. Now the 0.25 m distance between the two charges is reduced to half of the first distance, how would the electric force become
The terminal velocity of a 2 cm radius ball in liquid is 20 cms-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant
Suppose the water flows out from a pipe at 3 kg s-1and its velocity changes from 5m s-1to zero on striking the wall, the force exerted by water on wall will be
The value of acceleration due to gravity on the surface of the earth is g.If the diameter of the earth becomes double of its present value and its mass remains unchanged, the value of acceleration due to gravity on the surface of the earth would become
The optical resolution of microscope or a telescope tells us how close together, the two point sources of light can be so that they are still seen as two separate sources
Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be
The least count of stop watch is 0.10 sec,The time of 20 vibrations of pendulum is 40 sec The maximum possible percentage uncertainly in time period is
The spectrum of a star’s light is measured and the wavelength of one of the lines as thesodium’s line is found
to be 589 nm. The same line has the wavelength of 497 nm whenobserved in the laboratory. This means the
star is
When two balls collide then after collision, they rebound with velocities less than the velocities before the impact, because a portion of K.E is lost in the form of
The emf of a cell of negligible internal resistance is 2V. It is connected to the series
combination of 𝟐𝛀, 𝟑𝛀 𝐚𝐧𝐝 𝟓𝛀 resistance. The potential difference across 𝟑𝛀 resistance will be
in volt:
