The following 20 Multiple Choice Questions (MCQ) are based on
Chapter 5: Measurement of Length and Motion from the NCERT Class 6
Science textbook Curiosity. Each question has four options - select the
best answer and click to check.
Instructions: Read each question carefully. Choose the most
appropriate option from (a), (b), (c), or (d). Click
Show Answer to reveal the correct answer with explanation.
Multiple Choice Questions
1Why are body parts unsuitable as universal length units?
(a) Their sizes vary from person to person
(b) They are always one metre
(c) They cannot move
(d) They have no length
(a) is correct
A handspan or stride gives different results for different people.
2A standard unit is needed so measurements are:
(a) Different everywhere
(b) Based on opinion
(c) Impossible to repeat
(d) Consistent and comparable
(d) is correct
Agreed units allow clear communication.
3The SI unit of length is the:
(a) Kilometre
(b) Millimetre
(c) Metre
(d) Centimetre
(c) is correct
The metre is the base SI unit for length.
4One metre equals:
(a) 1 centimetre
(b) 100 centimetres
(c) 10 centimetres
(d) 1000 centimetres
(b) is correct
The prefix centi means one hundredth.
5One centimetre equals:
(a) 10 millimetres
(b) 100 millimetres
(c) 1 metre
(d) 1000 metres
(a) is correct
Ten millimetres make one centimetre.
6One kilometre equals:
(a) 100 metres
(b) 10 metres
(c) 10,000 metres
(d) 1000 metres
(d) is correct
Kilo denotes one thousand.
7Which unit is most suitable for the length of a pencil?
(a) Metre only
(b) Litre
(c) Centimetre
(d) Kilometre
(c) is correct
A pencil is conveniently measured in centimetres.
8Which unit suits the distance between two cities?
(a) Gram
(b) Kilometre
(c) Millimetre
(d) Centimetre
(b) is correct
Large travel distances are expressed in kilometres.
9When using a ruler, the eye should be:
(a) Directly above the reading mark
(b) Far to one side
(c) Closed
(d) Below the table
(a) is correct
A straight viewing angle avoids parallax error.
10If the zero end of a ruler is broken, measure by:
(a) Guessing the length
(b) Using only the last reading
(c) Adding both end readings
(d) Starting at another clear mark and subtracting readings
(d) is correct
Length equals final reading minus initial reading.
11The length of a curved line can be measured using:
(a) A balance
(b) A compass needle
(c) A flexible thread followed by a ruler
(d) Only a rigid ruler placed once
(c) is correct
Thread can follow the curve and then be straightened for measurement.
12Position describes where an object is relative to:
(a) Temperature
(b) A chosen reference point
(c) Its colour
(d) Its mass only
(b) is correct
Location has meaning only with respect to a reference.
13An object is in motion when its position:
(a) Changes with time relative to a reference
(b) Never changes
(c) Has a number
(d) Is measured in grams
(a) is correct
Motion is identified through changing relative position.
14Straight-line motion is called:
(a) Circular motion
(b) Oscillatory motion
(c) Random colour
(d) Linear motion
(d) is correct
A train on a straight track shows linear motion.
15The motion of a ceiling fan blade is:
(a) Oscillatory motion only
(b) No motion
(c) Circular motion
(d) Linear motion
(c) is correct
Points on the blade move around the axis in circles.
16The to-and-fro motion of a swing is:
(a) No motion
(b) Oscillatory motion
(c) Linear motion only
(d) Circular motion only
(b) is correct
It repeatedly moves about a mean position.
17Which object shows rotational motion?
(a) A spinning top
(b) A car on a straight road only
(c) A falling stone
(d) A resting chair
(a) is correct
The top turns about its own axis.
18A rolling bicycle wheel shows:
(a) Only rest
(b) Only oscillation
(c) No change of position
(d) Rotational and translational motion
(d) is correct
The wheel rotates while its centre moves forward.
19Distance travelled by a wheel can be estimated by multiplying its circumference by:
(a) Time only
(b) Radius alone without a factor
(c) Number of revolutions
(d) Its colour
(c) is correct
Each full revolution advances approximately one circumference without slipping.
20A metre scale should not be made of stretchable rubber because it:
