Current Affairs 2nd Class

Category : 2nd Class

                                                                        Measurement

Measurement of Length

There are various units for the measurement of the length. These are metre, centimetres, kilometres etc. The standard unit for the measurement of the length is metre.

1 centimetre = 10 millimetres

1 metre = 100 centimetres

1 kilometre = 1000 metres

• Example:

A rope is 45 centimetres long. What will be the length of the rope in millimetres?

(a) 450 millimetres                      (b) 4500 millimetres

(c) 405 millimetres                       (d) All the above

(e) None of these

Answer (a)

Explanation: 1cm = 10 millimetres, 45cm = 450 millimetres

Conversion between Metre and Centimetre

1 metre \[=1\times 100=100\]centimetres

2 metres \[=2\times 100=200\]centimetres

100metres \[=100\times 100=10000\]centimetres

• Example:

Convert 450 metres into centimetres

(a) 45000 cm                             (b) 4500cm

(c) 2550 cm                               (d) All the above

(e) None of these

Answer (a)

Explanation: 1 m = 100 cm.

Conversion between Kilometre and Metre

1 Kilometre \[=1\times 1000=1000\,\,metres\]

2 Kilometre \[=2\times 1000=2000\,\,metres\]

100 Kilometres \[=100\times 1000=100000\,\,metres\] 

• Example:

Convert 9 km 500 m in metres.

(a) 8400 metres                          (b) 9500 metres

(c) 7900 metres                           (d) All the above

(e) None of these

Answer (b)

Explanation: 9 km 500 m \[=(9\times 1000+500)\]

Measurement of Masses

Mass is measured in grams and kilograms. Small masses are measured in milligrams.

1 gram \[=1\times 1000=1000\] milligrams

1000 grams = 1 kilogram

• Example:

John bought the following items from the market: 3 kg 500 grams of potatoes, 4 kg 200 grams of onions and 2 kg 700 grams of green vegetables. What is the total weight of the items?

(a) 10 kg 400 grams                    (b) 6 kg 300 grams

(c) 7 kg 100 grams                      (d) All the above

(e) None of these

Answer (a)

Explanation: Total weight = 3 kg 500 grams + 4 kg 200 grams + 2 kg 700 grams = 9 kg 1400 grams = 10 kg 400 grams.

Measurement of Volume

The standard unit for the measurement of volume is litre. Volume of a liquid is measured in millilitres, litres and kilolitres.

1 litre \[=1\times 1000=1000\] millilitres

2 litres \[=2\times 1000=2000\] millilitres

1000 litres = 1 kilolitres     

• Example:

To obtain the volume of oil in litres how much quantity of oil is required in a container, which already contains 45 litres 900 millilitres of oil?

(a) 500ml                                   (b) 100ml

(c) 600ml                                   (d) All the above

(e) None of these

Answer (b)

Explanation: 45 litres 900 millilitres of oil becomes 46 litres when 100 millilitres is added to it.