Physics 8th STD Quiz

Thermal energy is associated with the motion of particles within a substance. The faster the particles move, the higher the temperature, and this energy is responsible for the sensation of warmth or heat.

Potential energy is stored energy that an object possesses due to its position or condition. In the case of a stretched rubber band, it has the potential to do work when released and can transform into kinetic energy.

The correct answer is "Electric Motor, dynamo, telegraph, telephone, electric bell, etc." These devices all utilize the magnetic effect. Electric motors use magnets to convert electrical energy into mechanical energy. Dynamos use magnets to generate electricity; telegraphs and telephones use magnets to transmit and receive signals, and electric bells use magnets to produce sound.

The correct answer is "Closed" because in a closed circuit, there is a complete path for the current to flow. This means that all the necessary components, such as wires and switches, are connected in a way that allows the current to flow from the source, through the circuit, and back to the source. In a closed circuit, the current can flow continuously, enabling the electrical devices connected to the circuit to function properly.

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This law emphasizes the balanced nature of forces in any interaction.

The circuit diagram is a visual representation of different circuit elements, such as resistors, capacitors, and transistors, using their conventional symbols. It allows us to understand how these elements are connected and interact with each other in a circuit. Therefore, the correct answer is that the circuit diagram indicates the arrangement of different circuit elements with their conventional symbols.

The correct answer is "If the switch is opened or the wire is cut the circuit is open." This is because when the switch is opened or the wire is cut, it creates a gap in the circuit, preventing the flow of current. In an open circuit, there is no complete path for the current to flow from the source to the load, resulting in no current flowing through the circuit.

In the electromagnetic spectrum, gamma rays have the shortest wavelength and the highest frequency. They are a form of ionizing radiation and are often associated with nuclear reactions and processes.

A closed circuit refers to an electric circuit where the current flows continuously without any interruption. In this context, if the current is drawn from the cell, it indicates that the circuit is complete and the current can flow through it, making it a closed circuit.