Measurments

The diagram shows an experiment to find the density of a liquid

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Answer explanation

As density = mass per unit volume

the empty tube has mass of 200 g

and the after filled it become 250 so the difference is 50 gram and volume is 25 cm3 so the d=m\v put values

An experiment is carried out to measure the extension of a rubber band for different loads. The results are shown below.

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Answer explanation

To find the missing length for a load of , let’s analyze the relationship between load and extension.

Step-by-Step Solution

1. Determine the Extension for Each Load:

• Load 0: Extension 0

• Load 1: Extension 1

• Load 2: Extension 2.1

• Load 3: Extension 3.4

2. Calculate the Missing Length:

The length with no load (0) is 15.2 cm. The extension increases as the load increases.

• For a load of 1, the length is 15.2 + 1 = 16.2 cm.

• For a load of 2, with an extension of 2.1, the length should be:

15.2 + 2.1 = 17.3 cm

Answer:

The missing length for a load of 17.3cm should be 17.3 cm.

A length of string is measured between two points on a ruler.

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Answer explanation

the length of the string is 15.6 - 2.4 = 13.2 and there are 6 number of turn (count it)

divide countes by the length of strinfg 13.2\6 = 2.2 cm

During an experiment to find the density of a stone, the stone is lowered into a measuring cylinder partly filled with water.

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The diagram shows a micrometer scale.

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Answer explanation

we have two scale here one is fix and other is movable the main scale reading is 7 count is preciously. than count the reading on movable scale reading

sleeve scale = 7mm

thimble scale = 0.14 mm

add both 7 + 0.14 = 7.14 mm

In a test, four students linked the quantities on the left with their units on the right. Which student matched them all correctly?

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A micrometer is used to measure the diameter of a uniform wire.

• A

• B

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• D

Answer explanation

The question asks what should be done to obtain an accurate reading using a micrometer.

Analyzing the Options:

• Option A: “Find the reading and add or subtract the zero error.”

• This is correct. When using a micrometer, you should check for zero error, which can occur if the device doesn’t read exactly zero when fully closed. You need to add or subtract this error from your final measurement to ensure accuracy.

• Option B: “Make the micrometer horizontal.”

• This is not necessary for accurate measurement, although holding the micrometer steady and correctly is important.

• Option C: “Subtract the fixed scale reading from the rotating scale reading.”

• This is incorrect. The correct approach is to add the fixed scale (sleeve) reading and the rotating scale (thimble) reading.

• Option D: “Subtract the rotating scale reading from the fixed scale reading.”

• This is also incorrect. The rotating scale is used to add finer measurements to the fixed scale reading.

Correct Answer:

Option A is the correct answer: Find the reading and add or subtract the zero error.

Before marking the finishing line on a running track, a groundsman measures out its 100 m length.

Which instrument is the most appropriate for this purpose?

• measuring tape

• metre rule

• 30 cm ruler

• micrometer

A length of copper pipe, of uniform cross-section and several metres long, carries water to a tap.

Measurements are taken to determine accurately the volume of copper in the pipe. Which instruments are used?

• calipers and micrometer

• micrometer and rule

• rule and tape

• tape and calipers

A manufacturer measures accurately the dimensions of a wooden floor tile. The approximate dimensions of the tile are shown.

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