Physics

    Physics
    The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall
    The pressure applied to walls of the dam will be a function of the amount of water that is over that particular point on the wall. So water pressure is very large at the bottom due to its large depth. That’s why dams are constructed thicker at their bottoms than at their tops.
    Author: rikazzz Comment
    Physics
    It takes much longer to cook food in the hills than in the plains, because
    It takes much longer to cook food in the hills than in the plains, because in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100C causing an increase in cooking time.
    Author: rikazzz Comment
    Physics
    Ball pen functions on the principle of :
    The ballpoint pen is one of the most simple and yet ubiquitous devices whose function depends on surface tension. With a pen held upright, gravity and surface tension act in concert to get ink onto the ball.
    Author: rikazzz Comment
    Physics
    On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
    On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because cohesion of mercury is greater than its adhesion with glass.
    Author: rikazzz Comment
    Information and Communication Technology
    A molded plastic disc on which digital data is stored in the form of microscopic reflecting and non-reflecting spots is known as
    Author: rikazzz Comment
    Physics
    Lux is the SI unit of
    Lux, unit of illumination (see luminous intensity) in the International System of Units (SI). One lux (Latin for “light”) is the amount of illumination provided when one lumen is evenly distributed over an area of one square metre.
    Author: rikazzz Comment
    Simple Harmonic Motion and Waves
    The speed of a wave in water depends on the
    Author: rikazzz Comment
    Geometrical Optics
    The inner part of the fiber optics which carries light is called
    Author: rikazzz Comment
    Everyday Science
    The force with which everybody attracts every other body is called force of
    Author: rikazzz Comment
    Physics
    A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:
    m=4 kg_x000D_ u=5 m/s_x000D_ v=10 m/s_x000D_ according to work energy theorem_x000D_ w=1/2*m*(v-u)_x000D_ w=1/2*4*(10-5)_x000D_ w=1/2*4*(100-25)_x000D_ w=2×75_x000D_ w=150 J
    Author: rikazzz Comment