List of top Questions asked in CBSE CLASS XII- 2026

Write any two precautions to be taken while using an immersion heater.
Explain the basic concept of transformer. Mention any two different types of transformers.
Write possible faults that may occur in a Room Cooler and an Electric Geyser. How can these faults be removed?
Explain in brief the different types of cooling systems used for transformers.
Draw a labelled diagram of an Electric Mixer.
Draw a diagram showing inductance in an AC circuit with the voltage and current waveform.
What do you understand by organisational skills? Which organisational skills help an entrepreneur to become successful?
Write the steps to protect a spreadsheet with a password.
List some ways by which one can reduce the amount of waste generated.
List the importance of positive thinking in life.
Mention general characteristics of DC shunt motor and its applications.
Write one sentence of each type --- Statement, Question, Exclamatory, Order.
Which transformer is known as a single winding transformer?
Star delta motor starters are used for ________ motors.
The efficiency of single-phase motor as compared to three-phase motor is:
Speed of motor used in electric mixer has ________ RPM.
In a series RLC circuit, R indicates:
Stator of three-phase induction motor is made by
The speed of motor or blower of room cooler is controlled by ________. (Selector switch Toggle switch)
Eddy current in dynamometer type wattmeter can be minimised by using ________ within the region of magnetic field. (Metallic parts Non-metallic parts)
Series testing leads are connected to the terminals of plug top of the water heater. The lamp is not glowing. This indicates ________. (Short circuit Open circuit)
Torque and armature current characteristics are known as ________ characteristics. (Electrical Mechanical)
The voltage transformer is also known as ________. (Air core transformer Potential transformer)
The electromagnet is the main component of driving system of energy meter.
Three-phase induction motor works on the principle of ________. (Self-induction Mutual induction)