Explanation

• the transfer of heat when waves or rays are dispersed from an object called Radiation
• ***
• different methods of heat transfer
• Conduction is heat transfer through stationary matter by physical contact. 
• Convection is the heat transfer by the macroscopic movement of a fluid.
• Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed.

Explanation

Thermal power generation consists of using steam power 

Thermal energy sources are fossil fuels like:

natural gas, coal, and oil

as well as solar heat

heat pump electric heat

and geothermal heat.

Explanation

Potential divider is a circuit that gives us continuously varying potential.

Examples of the potential dividers are Rheostat and Potentiometer

Explanation

In liquids, particles are quite close together and move with random motion throughout the container.

Particles move rapidly in all directions but collide with each other more frequently than gases due to shorter distances between particles.

With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion.

ND2-03-2023

Explanation

Ultrasound is sound with frequencies greater than 20 kilohertz.

This frequency is the approximate upper audible limit of human hearing in healthy young adults

while 

The first article on the history of ultrasound was written in 1948

Explanation

A chord is a line segment whose ends lie on the ends of a circle.

Explanation

A battery is a device that can store:

• electrical energy in the form of chemical energy,

• and convert that energy into electricity

However, when a storage battery is being used in UPS it needs charging. 

At the time of charging the conversion of electrical energy into chemical energy is observed.

Explanation

A galvanometer is an instrument that can detect and measure small amounts of current in an electrical circuit

Explanation

Explanation

• Gravitational potential is always negative, because it is defined as the work done per unit mass to bring an object from infinity to a given point in a gravitational field.
• Since the force of gravity is attractive, work must be done to move an object against the force of gravity, and this work is negative.