Explanation

A magnetic bar has two poles: the North pole and the South pole.

These poles determine the direction of the magnetic field.

Explanation

A refracting telescope has two lenses:

1. A primary lens (objective) that collects and focuses light.
2. A secondary lens (eyepiece) that magnifies the focused light to form an image.

Explanation

• In a mercury thermometer, the mercury in the bulb expands and rises in the tube, which has a linear scale ranging from 35°C to 42°C.
• This range is typically used for medical thermometers to measure human body temperature.

Explanation

• Aerosols are a type of mixture where solid particles or liquid droplets are suspended in a gas, like air.
• Examples of aerosols include mist, fog, dust, pollen, and spray cans.

Explanation

Thermal energy can be transferred through all three methods:

• Conduction: Direct transfer between particles in physical contact.
• Convection: Transfer through the movement of fluids.
• Radiation: Transfer through electromagnetic waves (e.g., light, radio waves).

Explanation

During projectile motion, the horizontal component of velocity "remains constant."

Explanation

 A semiconductor has electrical conductivity between that of a conductor and an insulator, and silicon falls within this category

Explanation

Electrons are elementary particles, meaning they are not composed of smaller components.

Hence, they are considered one of the most refined and fundamental forms of matter.

Explanation

Comets are icy bodies that orbit the Sun, and they appear as a long hair-like strand due to their tail of gas and dust.

They consist of three main parts:

1. Nucleus: The central, solid part of the comet.
2. Coma: The cloud of gas and dust surrounding the nucleus.
3. Tail: The long, trailing cloud of gas and dust that follows the comet as it orbits the Sun.

Explanation

When an object is placed far away from a concave mirror, its image will be:

• Real (a projected image that can be seen on a screen)
• Inverted (upside down)
• Smaller in size than the object (reduced)