Explanation

• A lake starts freezing because of the cold atmosphere. It will first freeze At the top surface
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• concept:
• when the water freezes to ice, the ice becomes significantly less dense than the water and continues to float on the lake's surface.
• Below 4° Celsius, water becomes less dense as it gets colder, causing water to freeze to float to the top.
  
  

Explanation

The phenomenon of refraction of light is the shift in the path of light as it travels from one medium to another

Explanation

The guitar is a musical instrument of the chordophone family.

The standard guitar has following six strings:

1. E

2. A

3. D

4. G

5. B

6. E

Explanation

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

Explanation

Ole Rømer, an astronomer from Denmark made the first quantitative measurements of the speed of light in 1676.

Explanation

• The great red Spot is a hurricane in Jupiter's southern hemisphere with purple-colored clouds that spin counterclockwise at wind speeds that exceed those in any hurricane on the earth.
• The excellent purple Spot has slowly changed over time, and is presently about 1.3 instances as huge as our planet.
  

Explanation

• Our universe become born about thirteen.7 billion years in the past in a huge expansion that blew area up like a massive balloon.
• That, in a nutshell, is the big Bang theory, which truly all cosmologists and theoretical physicists suggest.
• The evidence helping the idea is considerable and convincing.
  

Explanation

The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium.

Explanation

A rectifier is an electrical device that converts alternating current (AC),

which periodically reverses direction, to direct current (DC), which flows in only one direction.

Explanation

White goods are considered durable consumption goods.

This means they are goods that are designed to last for a significant period

They are used by consumers for their personal needs

White goods like refrigerators, washing machines, and dishwashers

They are built to withstand frequent use and last for several years.