Question

onal
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2). For listance between two cities say the distance
or wat between Delhi and Agra. It is not practicable
ritten length-kilometre. We express the larger
1 for distances like between two cities or between 60 seconds (s)
A full stop is not used at the end of a 1 kilometre (km) = 1000 metres (m)?
symbol. For example, symbol of kilogram The units of length which are greater than
is kg and not kg, and symbol of metres is the basic unit ie metre are called multiple
mand not m
units, while units which are smaller than basic
However, if the symbol appears at the unit are called sub-multiple units. These
end of a sentence, it is followed by a full stop multiple and sub-multiple units are also used
For example, Mohan's weight is 35 kg.
in measurement of mass and time.
MULTIPLE AND SUB-MULTIPLE UNITS The Table 2.1 gives some common
We have studied that the basic unit of multiple and sub-multiples of units of length,
length is metre. The length and breadth of a
mass and time
table in a room can be expressed in units of Table 2.1: Multiples and submultiples
netres. We can also express the height of a
of units of length, mass and time
pole or a building in units of metres. However,
Length
you want to measure the length of your 10 millimetres (mm) 1 centimetre (cm)
pencil or your science book, both of which are 10 centimetres (cm) 1 decimetre (dm)
much less than a metre, it becomes very 10 decimetres (dm) 1 metre (m)
nconvenient to express them in metres. Such 10 metres (m)
1 decametre (dam)
maller lengths are expressed in 10 decametres (dam) 1 hectometre (hm)
centimetres. Still smaller lengths like
10 hectometres (hm) 1 kilometre (km)m
Thickness of a scale or of a coin are expressed
Mass
in units of millimetres. The relation
10 milligrams (mg) 1 centigram (og)
between these three units is as under:
10 centigrams (cg) 1 decigram (dg)
1 metre (m) = 100 centimetres (cm)
10 decigrams (dg) 1 gram (g)
1 centimetre (cm) = 10 millimetres (mm)
10 grams (g)
1 decagram (dag)
10 decagrams (dag) 1 hectogram (hg)
10 hectograms (hg) 1 kilogram (kg)
100 kilograms (kg) 1 quintal
o measure and express such large distance in
1 metric tonne
Time
1 minute im
different locations in a big city, which are 60 minutes (min)
1 hour (h)
me far apart, in kilometres. The earth's radius, or 24 hours (h)
1 day (d)
distances between earth and moon or 365 days (d)
1 decade
between earth and sun etc. are also expressed 10 years
n kilometres. The relation between metres 10 decades (100 years)
= 1 century
and kilometres is given in this equation. 10 centuries (1000 years) = 1 millenni
in small
wewe
nits are
derived
alway Now suppose we want to measure the
in the metres. For this, we use another larger unit of 10 quintals
wo
and
B
nie
For
1 year
110
- Physics-VI​

Answer 1

Answer:

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