This question tests the understanding of energy conversion in common electrical appliances, specifically a room heater. A room heater's primary function is to produce heat, which implies a conversion of electrical energy into heat energy.
A) Electric energy, heat energy
When current flows through the resistive heating element of a room heater, electrical energy is converted into heat energy due to the resistance offered by the element. This phenomenon is known as the Joule heating effect, described by the formula \(H = I^2Rt\), where \(H\) is heat produced, \(I\) is current, \(R\) is resistance, and \(t\) is time. The primary purpose of a room heater is to produce heat.
The question asks to identify the correct difference between Bluetooth and Wi-Fi technologies. This requires knowledge of their operating principles, frequency bands, and typical applications.
A) Bluetooth primarily operates in the 2.4 GHz ISM band. Wi-Fi (IEEE 802.11 standards) also uses the 2.4 GHz band and, for higher speeds and less interference, also uses the 5 GHz band. This statement accurately describes a key difference in their frequency usage.
The question asks about the standard symbols used to represent an electric cell in circuit diagrams. Specifically, it focuses on identifying which line (longer or shorter) corresponds to the positive and negative terminals.
Since both statements are correct, the option that includes both (i) and (ii) is the correct answer.
C) both (i) and (ii) is correct because, by convention in electrical circuit diagrams, the longer line of an electric cell symbol denotes the positive terminal, and the shorter line denotes the negative terminal.
This question tests the fundamental principles of electromagnetism, specifically how electric charges interact with electric and magnetic fields. We need to recall the force equations for a charge in these fields.
This equation shows that if there is an electric field (\(\vec{E} \neq 0\)), a non-zero charge (\(q \neq 0\)) will always experience a force. This force acts in the direction of the electric field for a positive charge and opposite to it for a negative charge.
For a charge to experience a magnetic force, two conditions must be met: the charge must be moving (\(\vec{v} \neq 0\)) and there must be a magnetic field (\(\vec{B} \neq 0\)). If the charge is stationary (\(\vec{v} = 0\)), it will not experience any magnetic force, even if a magnetic field is present.
An electric charge will experience a force if an Electric Field is applied. The force experienced by a charge \(q\) in an electric field \(\vec{E}\) is given by \(\vec{F} = q\vec{E}\). This force acts on the charge regardless of whether it is stationary or moving.
This question tests the basic understanding of how to connect multiple cells (batteries) in series to form a battery pack. The goal is usually to increase the total voltage. To achieve this, cells must be connected in a specific orientation.
Correct Option: A) (i) only
The question asks to identify the correct statements regarding GAGAN (GPS-Aided Geo Augmented Navigation). We need to evaluate each statement based on the known characteristics and applications of GAGAN.
D) I and II only
Statements I and II accurately describe the functions and benefits of GAGAN. Statement III is incorrect because GAGAN's benefits are not limited to aviation but extend to various other modes of transportation and applications.