Chemical Reactions and Equations – Notes Chemical Reaction:- The change in which one or more new substances with different chemical properties are formed is called a chemical reaction. Common observations during a chemical reaction are:- Change in state Change in color Change in temperature Evolution of gas Word Equation:- A chemical reaction expressed in words rather than […]
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, […]
Electricity Important Questions The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V. The V-I graph of three resistors is shown below. Which resistor has maximum […]
Electricity Previous Years Questions Define 1 kilowatt hour. [1 mark] [CBSE 2019] The values of mA and µA are: [1 mark] [CBSE 2020] 10-6 A and 10-9 A respectively 10-3 A and 10-6 A respectively 10-3 A and 10-9 A respectively 10-6 A and 10-3 A respectively A cylindrical conductor of length ‘l’ and uniform area of cross-section ‘A’ has resistance ‘R’. Another […]
Electricity Notes Charge(Q):- Electric charge is the basic physical property of matter that causes it to experience a force when kept in an electric or magnetic field. It can be positive or negative. S.I. unit – Coulomb (C) Quantisation of Charge:- Every charge is an integral multiple of a basic charge i.e., charge on an electron(e–). […]