Light – Reflection & Refraction Previous Years Questions : Solutions The image distance from the eye lens in the normal eye when we increase the distance of an object from the eye increases decreases remains unchanged depends on the size of the eyeball [1 mark] [CBSE 2020]Sol:(3) remains unchanged Four students A, B, C and […]
Electricity Previous Years Questions : Solutions Define 1 kilowatt hour. [1 mark] [CBSE 2019]Sol: Electrical energy consumed by apliances is said to be 1 kilowatt hour if, it operates power of 1000 watt in 1 hour. 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 […]
Human Eye and Colourful World Quiz – 1 Test yourself what you have studied in this chapter with the help of this quiz created by the BrainIgniter experts and improve your study accordingly. Get the result instantly by clicking on submit button. Best wishes! [WATU 38]
Light Reflection and Refraction Quiz – 2 Test yourself what you have studied in this chapter with the help of this quiz created by the BrainIgniter experts and improve your study accordingly. Get the result instantly by clicking on submit button. Best wishes! [WATU 5]
Light Reflection and Refraction Quiz – 1 Test yourself what you have studied in this chapter with the help of this quiz created by the BrainIgniter experts and improve your study accordingly. Get the result instantly by clicking on submit button. Best wishes! [WATU 3]
Electric Motor Electric Motor:- An electric motor is a rotating device that converts electrical energy to mechanical energy. Principle:- It is based on the principle that when a current carrying conductor is placed in a magnetic field perpendicular to it, it experiences a force. Construction:- Consider a rectangular coil ABCD placed in a magnetic field […]
Electricity Important Questions : Solutions 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.Sol: Here, V = 60 V and I = 4 A Using, […]
Aim To determine the focal length of a convex lens by obtaining the image of a distant object. Apparatus Required Convex lens A meter scale A screen A lens holder A screen holder Theory For an object placed at infinity (practically a distant object), the image formed by a convex lens lies at the focus […]
Aim To determine the focal length of a concave mirror by obtaining the image of a distant object. Apparatus Required Concave mirror A meter scale A screen A mirror holder A screen holder Theory A concave mirror is defined as the spherical mirror whose reflecting surface is curved inwards and follows laws of reflection of […]
Sources of Energy Previous Years Questions Write the energy conversion that takes place in a hydropower plant. [1 mark] [CBSE 2018] What is a dam? Why do we seek to build large dams? While building large dams, which three main problems should particularly be addressed to maintain peace among local people? Mention them. [3 marks] […]