HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

The given circuit has two ideal diodes connected as shown in the figure below. Calculate the current flowing through the resistance R₁.

Four silicon diodes and a 10 Ω resistor are connected as shown in the figure below. Each diode has a resistance of 1 Ω. Find the current flows through the 10 Ω resistor.

Determine the current flowing through 3 Ω and 4 Ω resistors of the circuit given below. Assume that diodes D₁ and D₂ are ideal diodes.

In the given figure of a voltage regulator, a Zener diode of breakdown voltage 10 V is employed. Determine the current through the load resistance, the total current and the current through the diode. Use diode approximation.

The materials used in Robotics are ____________.

The alloys used for muscle wires in Robots are ____________.

Mention any two advantages and disadvantages of Robotics.

Why steel is preferred in making Robots?

Discuss the functions of key components in Robots?

Elaborate any two types of Robots with relevant examples.

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10Ω is ______.

What do you mean by internal resistance of a cell?

Explain the determination of the internal resistance of a cell using voltmeter.

Three identical lamps each having a resistance R are connected to the battery of emf as shown in the figure.

Suddenly the switch S is closed.

1. Calculate the current in the circuit when S is open and closed.
2. What happens to the intensities of the bulbs A, B and C.
3. Calculate the voltage across the three bulbs when S is open and closed.
4. Calculate the power delivered to the circuit when S is opened and closed.
5. Does the power delivered to the circuit decrease, increase or remain same?

A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. Calculate the internal resistance of the cell.

Determine the current flowing through the galvanometer (G) as shown in the figure.

The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenonid to demagnetize the ferromagnet completely is

What is magnetic susceptibility?

Compare dia, para and ferromagnetism.

Give the properties of dia/para/ferromagnetic materials.