Sources of Energy Notes Characteristics of a good source of energy:- Should have high calorific value. Easily available. Easy to transport & store. Should be economical. Should be ecofriendly. Safe & convenient to use. Renewable source of energy:- The source of energy which can be continuously generated by natural processes & whose supply is unlimited […]
Human Eye and Colourful World Important Questions The far point of a human eye has been shifted to 2 m from infinity. Name the eye defect the person is suffering from & also write its correction. Draw a ray diagram for its correction. Find the power of the lens required to correct this defect. Name […]
Human Eye and Colourful World Previous Years Questions The phenomena of light involved in the formation of rainbow are Refraction, dispersion and scattring. Refraction, reflection and scattring. Refraction, dispersion and internal reflection. Refraction, dispersion and total internal reflection. [CBSE 2023] [1 Mark] In the following diagram showing dispersion of white light by a glass prism, […]
Human Eye and Colourful World Notes Human eye ball is approximately spherical in shape with diameter of about 2.3 cm. Light enters the eye through a thin membrane called the cornea. Iris controls the size of pupil. Pupil regulates the amount of light entering the eye. Image is formed on retina & its nature is […]
Light Reflection and Refraction Previous Years Questions A student wants to obtain an erect image of an object using a concave mirror of 10 cm focal length. What will be the distance of the object from mirror ? Less than 10 cm 10 cm Between 10 cm and 20 cm more than 20 cm [1 […]
Light Reflection and Refraction Important Questions What is the focal length of a plane mirror ? Draw a ray diagram to show refraction of a light ray in a glass slab. A converging lens has a focal length of 15 cm. An object is placed 60 cm from the lens . Find the position, nature […]
Light Reflection and Refraction Notes Reflection of Light:- The phenomenon of bouncing back of a ray of light after striking on a highly polished surface is called reflection of light. Laws of Reflection:- First law:- The angle of incidence is equal to the angle of reflection. i.e., ∠i = ∠r Second Law:- The incident ray, […]
Magnetic Effects of Electric Current – Important Questions Which of the following represent voltage? Work done/(Current x Time) Work done x Charge (Work done x Time)/Current Work done x Charge x Time Name any two appliances which are based on the application of heating effect of electric current. What is meant by the term frequency […]
Magnetic Effects of Electric Current Previous Years Questions The magnetic field inside a long straight carrying solenoid : is zero decreases as we move towards its end. increases as we move towards its end. is same at all points. [1 Mark] [CBSE 2023] How is the type of current that we receive in domestic circuit […]
Magnetic Effects of Electric Current Notes Magnetic Field:- The region surrounding the magnet in which the force of magnet can be detected is said to have magnetic field. Magnetic Field Lines:- The magnetic field lines are the lines drawn in a magnetic field along which a north magnetic pole of magnetic compass would move. Or, […]