6th Science : Term 1 Unit 1 : Measurements : Book Back Questions Answers, Solution

**Evaluation**

**I. Choose the correct answer**

** **

**1. ****The girth
of a tree can be measured by**

a. Metre scale

b. Metre rod

c. plastic ruler

__d. measuring tape__

**Answer: (d) measuring tape**

**2. The
conversion of 7 m into cm gives**

a. 70 cm

b. 7 cm

__c. 700 cm__

d. 7000 cm

**3. Quantity
that can be measured is called**

a. Physical quantity

__b. Measurement__

c. unit

d. motion

**4. Choose
the correct one**

a. km > mm > cm > m

b. km> mm > cm > km

__c. km > m > cm > mm__

d. km > cm > m > mm

**5. While
measuring length using a ruler, the position of your eye should be**

a. Left side of the point.

__b. Vertically above the point where the
measurement is to be taken.__

c. Right side of the point

d. Any where according to one’s convenience.

**II. True or False**

1. 126 kg is the correct way of expressing mass. **[True]**

2. Length of one’s chest can be measured by using
metre scale. **[True]**

3. Ten millimetres makes one centimetre. **[True]**

4. A hand span is a reliable measure of length. **[False]**

5. The SI system of units is accepted everywhere
in the world. **[True]**

**III. Fill up the blanks**

1. SI Unit of length is symbolically represented as ** meter(m)**.

2. 500 gm = ** 1/2 **kilogram

3. Distance between Delhi and Chennai can be
measured in __Kilometer__

4. 1 m = ** 100** cm

5. 5 km = ** 5000** m.

**IV. Analogy**

**1. Sugar: Beam balance; Lime juice? **

**2. Height of a person: cm; length of your
sharpened pencil lead? **

**3. Milk: volume; vegetables? **

**V. Match the following**

Column A / Column B

1. Length of the fore arm - Metre

2. SI unit of length- Second

3. Nano- 10^{3}

4. SI Unit of time - 10^{–9}

5. Kilo- Cubit

**Column A - Column B**

1. Length of the fore arm - Cubit

2. SI unit of length - Metre

3. Nano - 10^{-9}

4. SI Unit of time - Second

5. Kilo - 10^{3}

**VI. Complete the given table**

Volume = ** litre **: Kg =

Length of your little finger = ** hand span** : Km :

**VII. Arrange in increasing order of unit**

1 Metre, 1 centimetre, 1 kilometre, and 1 millimetre.

**Answer: 1 millimetre , 1 centimetre , 1 Metre , 1 kilometre.**

**VIII. Find the answer for the** **following questions within
the grid**

1. 10^{-3}
is one ** milli**.

2. SI Unit of time ** second**.

3. Cross view of
reading for a measurement leads to ** error**.

4. ** Time** is the one what a clock reads

5. ** Mass** is the amount of substance
present in an object

6. ** Average** can be taken to get the final
reading of the recordings of different of students for a single measurement.

7. ** Length** is
a fundamental quantity

8. ** Odometer** shows the distance covered by an
automobile

9. A tailor use ** tape** to take measurements to stitch a
cloth

10. Liquids are
measured with this physical quantity __litre__

**IX. Answer in a word or two.**

**1. ****What is the
full form of SI system?**

**• **The full form of SI system
is International Standard

**2. Name any one instrument used for measuring
mass.**

**• **Instrument used for measuring mass is
electronic balance

**3. Find the odd one out Kilogram, Millimetre,
Centimetre, Nanometre**

Kilogram, Millimetre, Centimetre, Nanometre

**• **Kilogram

**4. What is the SI Unit of mass?**

**• **The SI Unit of mass is Kilogram.

**5. What are the two parts present in a
measurement**** **

**• **The two parts present in a measurement
are a number and its unit.

** **

**X. Answer in a sentence or two.**

** **

**1. Define
measurement. **

**• **The comparison of unknown quantities
with some known quantities is known as measurement.

**• **Measurement of a quantity has two parts:
a number and its unit.

**• **E.g., 500 gm , 5 km

**2. Define
mass. **

**• **Mass is the measure of the amount of
matter in an object.

**• **Weight is the gravitational pull experienced
by the mass.

**3. The distance
between two places is 43.65 km. Convert it into metre and cm. **

**• **1 km = 1000 m

**• **43.65 km = 43.65 × 1000 = 43650 m

**• **1 m = 100 cm ; 1 km = 100000 cm

**• **43.65 km = 43.65 × 100000 = 4365000 cm

**4. How
will you measure the volume of irregular objects? **

**• **There is no mathematical formula to measure
the volume of irregular objects.

**• **By water displacement method we measure
the volume of irregular objects.

**5. What
are the rules to be followed to make accurate measurement with scale? **

**• **Correct position of the eye is important
for taking measurement.

**• **Your eye must be exactly in front of
vertically above the point where the measurement has to be taken.

**• **In the above representation, to avoid
parallax error, reading will be correct.

**• **From positions ‘A’ and ‘C’, the readings
will be different and erroneous.

**• **B is Correct position of the eye to take
measurement.

**XI. Solve the following**

**1. The
distance between your school and**** ****your
house is 2250 m. Express this**** ****distance
in kilometre.**

**Solution:** 1 km = 1000 m

**• **2250 m = 2250 / 1000 = 2.25 km

**2. While measuring
the length of a sharpened pencil, reading of the scale at one end is 2.0 cm and
at the other end is 12.1 cm. What is the length of the pencil? **

**Given:** one end (starting) = 2.0 cm

other end (finishing) = 12.1 cm

**To find:** the length of the pencil = ?

**Solution:** The length of the pencil = finishing end - starting end

= 12.1 - 2.0 cm = 10.1 cm

The length of the pencil is 10.1cm.

**XII. Write in detail**

**1. Explain
two methods those you can use to measure the length of a curved line.**

Measuring the length of a curved line Using a string

**• **Draw a curved line AB on a piece of paper.

**• **Place a String along the curved line.

**• **Make sure that the string covers every
bit of the curved line.

**• **Mark the points where the curved line
begins and ends on the string.

**• **Now, stretch the string along the length
of a meter scale and measure the distance between the two markings of the string.

**• **Note it. This will give you the length
of a curved line.

**2. Measuring the length of a curved
line using a divider.**

**• **Draw a curved line AB on a piece of paper

**• **Separate the legs of the divider by 0.5
cm or 1 cm using a ruler.

**• **Place it on the curved line starting
from one end. Mark the position of the other end.

**• **Move it along the line again and again
cutting the line into number, of segments of equal lengths. The remaining-parts
of the line can be measured using a scale.

**• **Count the number of segments

**• **Therefore, the length of the line = (number
of segments × length of each segment) + length of the left over part.

**3. How
will you measure the volume of irregular objects? **

**• **There is no mathematical formula to measure
the volume of irregular objects.

**• **But there are many ways to find volume
of irregular objects.

**Water displacement method:**

**• **Fill a graduated measuring cylinder with
water to certain level, say 50 ml.

**• **Tie the stone with a piece of fine thread.
Immerse the stone completely into water.

**• **As the stone is immersed, we can observe
that water level increases.

**• **The stone displaces the water to occupy
the space inside the measuring cylinder.

**• **It would be equal to the space taken
up by stone.

**• **So the amount of water displaced will
be the volume of the stone.

**• **This method is called as water displacement
method.

**• **Suppose initially the water level was
50 ml.

**• **After you immerse a stone the water level
rises to 75 ml.

**• **Volume of the water displaced is 75 ml
- 50 ml = 25ml

**• **1 ml = 1 cubic cm

**• **25ml = 25 cm.the volume of stone = 25cm^{3}.

**4. Fill
up the following chart.**

Tags : Measurements | Term 1 Unit 1 | 6th Science , 6th Science : Term 1 Unit 1 : Measurements

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6th Science : Term 1 Unit 1 : Measurements : Questions Answers | Measurements | Term 1 Unit 1 | 6th Science

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