Physics

    Geometrical Optics
    The focal length of a concave lens is negative. Therefore, its power should be:
    Author: rikazzz Comment
    Everyday Science
    After long periods of use, a grey spot develops on the inside of a bulb. This is because
    At high operating temperatures, tungsten evaporates from the filament and gradually forms a gray film on the inside of the bulb. The inert gas atoms collide with the evaporating tungsten, causing some of the tungsten atoms to return to the filament.
    Author: rikazzz Comment
    Physics
    Which type of mirror is used in the head lights of vehicles?
    Concave mirrors are used in head lights of vehicles because when the bulb of headlight is placed at focus of concave mirror it will allow the light to spread out to infinity after the reflection on the mirror.
    Author: rikazzz Comment
    Everyday Science
    What kind of energy is stored in the water of a dam?
    Author: rikazzz Comment
    Dynamics
    SI unit of momentum is:
    Momentum is defined as the product of an object’s mass and its velocity. Since mass is measured in kilograms (kg) and velocity in meters per second (m/s), the SI unit for momentum is kilogram meter per second (kg m/s).
    Author: rikazzz Comment
    Work and Energy
    Anna carries a 12 kg bag upstairs to a height of 15 steps. If the height of each step is. 15.3 cm, then amount of work she has done is?
    Author: rikazzz Comment
    Current Electricity
    SI unit of potential difference is
    Author: rikazzz Comment
    Everyday Science
    Which rays do bats and dolphins use to see?
    Author: rikazzz Comment
    Everyday Science
    When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are
    The waves produced on the surface of water in the pond is an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
    Author: rikazzz Comment
    Everyday Science
    When light travels in water or glass from air its speed?
    Author: rikazzz Comment