- ATrue
- BFalse
Answer: a) Magnetic field
Explanation: The magnetic field is the region around a magnet where its magnetic force can be detected.
Answer: d) Ferromagnetic materials
Explanation: Ferromagnetic materials such as iron, nickel, and cobalt can be magnetized because they have unpaired electrons in their outer shells that can be aligned to create a magnetic field.
Answer: d) Magnetometer
Explanation: A magnetometer is a device used to measure the strength and direction of a magnetic field.
Answer: d) Lodestone
Explanation: Lodestone is a naturally occurring magnetized mineral that is made up of magnetite.
Answer: b) Paramagnetism
Explanation: Paramagnetism is a type of magnetism that is only temporary and occurs when a material is placed in an external magnetic field. This type of magnetism is caused by the alignment of magnetic moments in the material with the external magnetic field, but it disappears once the external field is removed.
JSON, in the context of AJAX, stands for JavaScript Object Notation. It is a lightweight data interchange format used to transmit data between a client and a server.
In jQuery, the $.ajax() method is used to send AJAX requests. It provides a flexible and powerful way to make asynchronous requests to the server and handle responses.
The readyState property in AJAX is used to track the status of the XMLHttpRequest object. It indicates the current state of the request-response cycle, allowing developers to handle different stages accordingly.
The $.getJSON() method in jQuery is used to retrieve JSON data from the server using a GET request. It simplifies the process of making asynchronous requests and handling JSON responses.