Name: Units of Length at Different Scales
Uploaded: 2019-07-19
Duration: 2 min 42 s
Description: Have you heard the terms micro, milli, kilo? They seem to have quite some significance, which explains why they have a ubiquitous presence in science. Let’s...

Question

Picture Based Question
Identify the types of time measuring devices given below.

Accepted Answer

Water clock

Water clock
The Greeks invented water clocks to measure time at night. It was based on the rising and falling of a liquid column. Time was measured by the regulated flow of liquid into or out of a vessel. The drawback with water clocks was that they required regular monitoring as the rate of flow of water would vary with temperature.

Sand clock

Sand clock
A sand clock is also known as an hourglass. A sand clock measures the passage of a few minutes or an hour of time. It has two vertical glass bulbs allowing a regulated trickle of sand from top to bottom. Once the top bulb is emptied, it can be inverted to begin measuring time again. These days hourglasses are used as ornamental pieces, egg timers for cooking and clocks in board games.

Quartz clock

Quartz clock
With the invention of the quartz crystal in $1921$ , timekeeping accuracy was highly improved. The quartz clock was invented in $1927$ . It is an analogue clock in which the hours, minutes, and sometimes seconds are indicated by hands on a dial.

Subject Experts Solutions for Chapter: Physical Quantities and Measurement, Exercise 6: Worksheet

Subject Experts Physics Solutions for Exercise - Subject Experts Solutions for Chapter: Physical Quantities and Measurement, Exercise 6: Worksheet

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