Books by Author Lovekush Kumar
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Recent Articles
If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be :
As a convention u is taken -ve for real object. In this case as object and image are opposute side of the mirror so for -ve u the v is taken as +ve.
A stone of mass 900g is tied to a string and moved in a vertical circle of radius 1m making 10 rpm. The tension in the string, when the stone is at the lowest point is (use pi square = 9.8 and g = 9.8 m/s^2)
First change RPM to radian per second by using definition formula of angular speed (omega)
The bob of a pendulum was released from a horizontal position. The length of the pendulum is 10m. If it dissipates 10% of its initial energy against air resistance, the speed with which the bob arrives at the lowest point is : [Use, g : 10 meter per second square]
lost 10% so remaining is 90 % which means ME2= (90/100) multiplied by ME1
A bob of mass ‘m’ is suspended by a light string of length ‘L’. It is imparted a minimum horizontal velocity at the lowest point (A) such that it just completes half circle reaching the top most position(B). The ratio of kinetic energies at lowest point and highest point is ?
The temperature of a gas having 2.0 × 10^25 molecules per cubic meter at 1.38 atm (Given, k = 1.38 × 10^–23 Joule per Kelvin) is: JEE 2024
Volume is not given so assume it to be 1 meter cube then corresponding moles(n) can be calculated using the number density given in question so that we can use ideal gas equation.
In an a.c. circuit, voltage and current are given by : V = 100 sin (100 t) V and I = 100 sin (100 t + pi / 3 ) mA respectively. The average power dissipated in one cycle is : JEE 2024
Two sources of light emit with a power of 200 W. The ratio of number of photons of visible light emitted by each source having wavelengths 300 nm and 500 nm respectively, will be : JEE 2024
A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity 4 m s^–1. The ball strikes the water surface after 4 s. The height of bridge above water surface is (Take g = 10 m s^–2)
A bullet from a gun is fired on a rectangular wooden block with velocity u. When bullet travels 24 cm through the block along its length horizontally, velocity of bullet becomes u/3 . Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is ?NEET UG2023
A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic field B = (2iˆ + 3jˆ – 4kˆ) T. The magnitude of the magnetic force acting on the wire is ?NEET UG2023
