Name: Range of Length
Uploaded: 2019-07-19
Duration: 6 min 55 s
Description: If all the scales are suddenly disappeared, how can we know what exactly is 1 meter? Watch this amazing video to understand how a meter is defined.

Question

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

Accepted Answer

(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 $(\frac{1}{1000})$ 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 $(\frac{1}{1000})$ 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

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