What are stopwatches used for Class 7?

Answer: We will use stopwatch for measuring short intervals of time accurately. This watch is designed to measure the amount of time elapsed from a particular time when activated to until it is deactivated.

What is the use of speedometer Class 7 science?

Speedometer and Odometer

An instrument on a vehicle’s dashboard which indicates the speed of the vehicle when it is running, is called speedometer. The speedometer has the symbol km/h written on its dial. Odometer is an instrument for measuring the distance travelled by a vehicle.

Why do we need clocks Class 7?

Answer: All our activities depend on time. … For example, to know the duration of a journey, to meet the schedules in work, to know whether its day or night, to know the heartbeat, to know the amount of time taken by the computer to perform an operation etc. Hence it is very important to measure the time.

What is wind class 7 short answer?

Moving air is called Wind. Since air is a mixture of gases, wind is the flow of gases on a large scale. Winds are caused by heating difference between different parts of the world and the movement of the earth.

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What is hundi Class 7 Ncert?

Hundi is a note recording a deposit made by a person. The amount deposited can be claimed in another place by presenting the record of the deposit.

What is speedometer used for?

speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled. A speedometer.

What is the use of odometer and speedometer?

The odometer is the device which is used to measure the distance travelled. The distance travelled by vehicle between any two points can be known by the odometer. The speedometer is the device which can tell us the instantaneous speed of any vehicle.

What are quartz clocks Class 7?

The clocks and watches which use quartz crystals for their working are called quartz clocks and quartz watches. They are also called electronic clocks and watches. The quartz clocks and watches(or electronic clocks and watches) can be of two types: non-digital and digital.

When was the clock made?

The first mechanical clocks were invented in Europe around the start of the 14th century and were the standard timekeeping device until the pendulum clock was invented in 1656. There were many components that came together over time to give us the modern-day timekeeping pieces of today.

Which clock is used in GPS?

Atomic clocks are used onboard GPS satellites that orbit the Earth, but even they must be sent updates two times per day to correct the clocks’ natural drift.

What is wind flow pattern Class 7?

Answer: wind is the flow of gases on a large scale on the surface of earth. Wind flow pattern means that in which direction the wind is blowing.

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What are the wind types in Class 7 wind?

The wind is the movement of air from the high-pressure areas to low-pressure areas. It is divided into three types: Permanent winds.

  • Permanent winds. The trade winds, westerlies, and easterlies are the permanent winds. …
  • Seasonal winds. …
  • Local winds.

What is wind class 8?

Hint: Flow of the gases on very large scale is called as wind, on the surface of the earth, wind is the flow of air while on the outer surface, which means that out of planet, wind is the nothing but flow of gases that are emitted from the sun.

What is Hundi in short answer?

Hundi is a financial instrument that developed in Medieval India for use in trade and credit transactions. Hundis are used as a form of remittance instrument to transfer money from place to place, as a form of credit instrument or IOU to borrow money and as a bill of exchange in trade transactions.

What does Hundi mean?

Technically, a Hundi is an unconditional order in writing made by a person directing another to pay a certain sum of money to a person named in the order. Hundis, being a part of the informal system have no legal status and are not covered under the Negotiable Instruments Act, 1881.

What was Mandapika?

A mandapika or a Mandi refers to a market in small town in which nearby villagers brought their products to be sold. It was an important place where internal trade took place.