Explanation

A wattmeter is an electrical instrument which is used to measure the electric power (in watts) of any electrical circuit.

**Additional Information**

Voltmeter – is used to measure the electric potential difference between two points,

Wavemeter – is used to measure the wavelength of a radio wave,

Viscometer – is used to measure the viscosity of the liquid.

Explanation

• Nebulae are primarily made up of Hydrogen (97%) and Helium (3%).
• These vast clouds of gas and dust serve as the birthplace of stars, with hydrogen being the most abundant element in the universe.

Explanation

• The wavelength of a transverse wave is the distance between two adjacent crests or troughs.
• It is a fundamental property of waves and is typically denoted by the symbol λ (lambda).

Explanation

• Meteoroids are small particles from space that enter the Earth's atmosphere.
• It producing a bright streak of light, commonly known as a shooting star or meteor.
• If a meteoroid survives its passage through the atmosphere and lands on Earth, it is called a meteorite.

Explanation

• If a celestial body moves around another large celestial body it is called a natural satellite.
• Natural satellites, like moons, orbit planets due to gravitational forces, distinguishing them from artificial satellites, asteroids, and planets.

Explanation

• The three bones in the middle ear are the malleus (hammer), incus (anvil), and stapes (stirrup).
• The stapes, or stirrup, is the last bone in the chain and transmits sound vibrations to the inner ear.

Explanation

• When sound travels through air, the air particles vibrate back and forth along the direction of wave propagation.
• This means that the air particles oscillate in the same direction as the sound wave is traveling.
• It allowing the energy of the sound wave to be transmitted through the air.

Explanation

• Kinetic energy is the energy an object possesses due to its motion.
• Any moving object, such as a car, a ball, or a person, has kinetic energy.
• The amount of kinetic energy an object has depends on its mass and velocity.

Explanation

• If an opaque object is moved further away from the light source, the shadow gets smaller.
• This is because the light source appears smaller from a distance, casting a smaller shadow.

Explanation

• Laboratory thermometers typically have a lower temperature range than clinical thermometers, and are designed to measure temperatures in a laboratory setting.
• The lowest temperature in a laboratory thermometer is often around -10°C or even lower, depending on the specific thermometer.