Concave mirror is used in headlights of vehicles, because when the bulb of headlight is placed at focus of concave mirror, it allows the light to... View Article
An optical aid is used in conjunction with the eye i.e. using optical instruments for improving the vision whereas non-optical aid include visual... View Article
The more conductive a material is to magnetic fields, the higher its permeability. magnetic permeability is maximum for ferromagnetic substance.... View Article
Answer: Power is defined as the rate at which work is done upon an object. Power is a time-based quantity. Which is related to how fast a job is... View Article
The intensity of a wave is directly proportional to the amplitude of the wave. Light is an electromagnetic wave. its intensity will depend on the... View Article
When a solid body is negatively charged by friction, it means that the body has acquired excess of electrons. If the body loses electrons it... View Article
Zero error is simply the reading of the measuring device when input quantity is zero . To correct such an error , you subtract the zero error... View Article
The correct answer is (a) its velocity changes but speed remains the same A uniform circular motion is the movement of an object along the... View Article
Answer: The electrical resistance of a circuit is the ratio between the voltage applied to the current flowing through it. According to Ohm’s... View Article
The process of bending of light while travelling from one medium to another is called refraction . Refractive Mirror reflect all incident light... View Article
The physical quantity having unit volt/ampere is known as resistance . It has a dimension of ML2 T-3 I-2 where M is mass, L is length, T is time,... View Article
A photon has energy E = hf where h is Planck's constant and f is the frequency of the photon. According to Einstein's mass energy equivalence E =... View Article
The gravitational force is responsible for the stability of the universe.The gravitational force on Earth is equal to the force the Earth exerts... View Article
The solar constant is defined as the solar energy incident per unit area per second on earth. [Solar constant] = [Energy/(Area x Time)] = [ML2T... View Article
Answer: The meaning of velocity of an object can be defined as the rate of change of the object’s position with respect to a frame of reference... View Article
