Match the following. (a) SI unit of time (i) Length, Mass, Time (b) Rotational motion (ii) Small unit of measuring length (c) Three fundamental physical quantities (iii) Straight line motion (d) A length which is 1 1000 th part of a metre (iv) Improper unit of measurement (e) Hand span (v) 10 km (f) A length equal to 10000 m (vi) Motion about an axis (g) Rectilinear motion (vii) Millimetre (h) Millimetre (viii) Second

(a) SI unit of time is second. (b) Rotational motion is motion about an axis. Note: SI unit of length is meters. An example of rotational motion is spinning top. (c) Three fundamental physical quantities are length, mass and time. (d) A length which is 1 1000 th part of a metre is millimetre. Note: SI unit to measure mass of a quantity is kilograms. (e) Hand Span is an improper unit of measurement. (f) A length equal to 10000 m is 10 km . Note: Meter is a standard unit of length. (g) Rectilinear motion is a straight line motion. (h) Millimetre is small unit of measurement. Note: Kilometre is the unit of length that is used to measure distances between cities. Therefore, we have left hand side column matched with right hand side column as: (a) SI unit of time (viii) Second (b) Rotational motion (vi) Motion about an axis (c) Three fundamental physical quantities (i) Length, Mass Time (d) A length which is 1 1000 th part of a metre (vii) Millimetre (e) Hand span (iv) Improper unit of measurement (f) A length equal to 10000 m (v) 10 km (g) Rectilinear motion (iii) Straight line motion (h) Millimetre (ii) Small unit of measuring length

Measurement is defined as a comparison of a physical quantity to a given standard unit. It is the determination of the size or magnitude of something. Measurement provide us with a means of describing various phenomenon in quantitative terms. It can also e considered as the process by which one can convert physical parameters to meaningful numbers.

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Science Spark>Chapter 11 - Measurement and Motion>Put on your thinking cap>Q 3

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SI unit of temperature is Celsius.

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Important Questions on Measurement and Motion

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Science Spark>Chapter 11 - Measurement and Motion>Put on your thinking cap>Q 3

One millimetre is equal to

1, 00, 000 m .

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Science Spark>Chapter 11 - Measurement and Motion>Put on your thinking cap>Q 3

The motion of planets around the sun is curvilinear motion, but not periodic.

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Science Spark>Chapter 11 - Measurement and Motion>Put on your thinking cap>Q 3

We use clock to measure accurate time interval of sports event.

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Science Spark>Chapter 11 - Measurement and Motion>Put on your thinking cap>Q 3

The SI unit of mass is grams.

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Science Spark>Chapter 11 - Measurement and Motion>Put on your thinking cap>Q 4

Match the following.

(a) SI unit of time	(i) Length, Mass, Time
(b) Rotational motion	(ii) Small unit of measuring length
(c) Three fundamental physical quantities	(iii) Straight line motion
(d) A length which is $(\frac{1}{1000})$ th part of a metre	(iv) Improper unit of measurement
(e) Hand span	(v) $10 km$
(f) A length equal to $10000 m$	(vi) Motion about an axis
(g) Rectilinear motion	(vii) Millimetre
(h) Millimetre	(viii) Second