Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5
Measurement of Length and Motion Class 6 Very Short Answer Type Questions
Question 1.
Are senses reliable for accurate measurement?
Answer:
Our senses are not reliable for accurate measurement.
Question 2.
Why can kandspan and arm length not be used as standard units of length?
Answer:
Because these vary from person to person.
Question 3.
How many centimetres are there in 1 m?
Answer:
100 cm
Question 4.
Name the measuring device which can be used for measuring the girth of a tree.
Answer:
Measuring tape
Question 5.
Give one example of linear motion.
Answer:
Motion of stone falling from a certain height
Question 6.
Give an example of circular motion.
Answer:
Motion of arms of watch
Question 7.
Name the types of motion in which a body moves along a straight path.
Answer:
Rectilinear or linear motion
Question 8.
Find the length and breadth of given rectangle in mm and cm.
Answer:
Length AB /3 cm and breadth BC = 2 cm.
AB = 3 × 10 = 30 mm
BC = 2 ×Question 9. 10 = 20 mm
Question 9.
Give the unit for measuring the following:
(a) Distance between Mumbai and Goa.
(b) Thickness of a coin.
(c) Length of your sharpner.
(d) Length of your shoe lace.
Answer:
(a) Kilometre
(b) Millimetre
(c) Centimetre
(d) Centimetre
Question 10.
Name the device used to measure the following:
(a) Size of your shoulder
(b) Size of your wrist
(c) Your height
(d) Your weight
(e) Cloth for curtain
(f) Circumference of round table
Answer:
(a) Measuring tape
(b) Measuring tape
(c) Measuring tape.
(d) Weighing balance
(e) Metre scale or measuring tape
(f) A long thread or measuring tape
Question 11.
What is used to measure the length of a table?
Answer:
Ruler or measuring tape.
Question 12.
Which unit is used to measure the height of a person?
Answer:
Centimetres (cm) or metres (m).
Question 13.
One metre has 10 equal parts called.
Answer:
Decimetres
Question 14.
Motion of wheel of a car is an example of
Answer:
Circular motion
Question 15.
What is the S.I. unit of length?
Answer:
Metre
Question 16.
What type of motion does the seconds hand in a clock have?
Answer:
Rotational motion
Question 17.
What type of motion does a swing exhibit?
Answer:
Oscillatory motion
Measurement of Length and Motion Class 6 Short Answer Type Questions
Question 1.
State two precautions to be observed while measuring length with the help of a metre scale. .
Answer:
Two precautions are:
(i) The initial point of distance must coincide with the zero reading of metre scale.
(ii) The eye should be kept in line with the point of measurement.
Question 2.
Define rest and motion.
Answer:
The Objects which do not change their positions with time are said to be at rest. The objects which change their positions with time are said to be in motion.
Question 3.
Define the term standard unit.
Answer:
The unit that could be used everywhere as a basic unit of measurement is called a standard unit.
Question 4.
How many millimetres are there in a centimetre?
Answer:
10 millimetres
Question 5.
Give one example each of the following types of motion:
(a) Linear
(b) Circular
(c) Periodic.
Answer:
Types of motion Example
(a) Linear Falling of a stone from height
(b) Circular Moving fan
(c) Periodic Pendulum of clock
Question 6.
What type of motion do wheels of a bicycle show when it moves?
Answer:
When bicycle moves it shows rotational motion.
Question 7.
What type of motion is described when an object moves in a straight line without changing its direction?
Answer:
This type of motion is called linear motion. It occurs when an object moves from one point to another in a straight path, like a car driving down a road.
Question 8.
Give an example of an everyday object that exhibits linear motion.
Answer:
A bicycle moving along a straight road demonstrates linear motion as it travels from one place to another without turning.
Measurement of Length and Motion Class 6 Long Short Answer Type Questions
Question 1.
Why do we need standard unit for measurement?
Answer:
We need standard unit for measurement to make our judgement more reliable and accurate. For proper dealing, measurement should be same for everybody. Thus, there should be uniformity in measurement. For the sake of uniformity we need a common set of units of measurement, which are called standard units. Nowadays, SI units are used in science and technology almost universally.
Question 2.
What type of motion do the following objects have?
(a) The galloping of a horse
(b) The needle of a sewing machine
(c) The bike move on a straight road
(d) The blades of an electric fan
(e) Truck moving in a well.
(f) Wheels of moving car.
Answer:
(a) The galloping of a horse: Linear motion
(b) The needle of a sewing machine: Periodic motion
(c) The bike move on a straight road : Linear motion
(d) Blade of an electric fan: Circular motion
(e) Truck moving in a well: Circular motion
(f) Wheels of moving car: Linear motion and Rotational motion
Question 3.
Give two examples for each of the following motions:
(i) Linear motion
(ii) Spinning motion
(iii) Oscillatory motion
(iv) Periodic motion
(y) Circular motion
Answer:
(i) Linear motion:
(a) March-past of soldiers in a parade,
(b) Moving of bicycle on a straight road.
(ii) Spinning motion:
(a) Rotating fan,
(b) Wheel of sewing machine
(iii) Oscillatory motion:
(a) Pendulum of clock,
(b) Motion of a child on a swing.
(iv) Periodic motion:
(a) Pendulum of clock,
(b) Motion of a swing
(c) Heartbeat
(v) Circular motion:
(a) Rotation of fan,
(b) Bicycle wheel.
Measurement of Length and Motion Class 6 Skill-Based Questions
Question 1.
Observe the pictures given below. Write the type of motion these objects exhibit while in action/or being played.
Answer:
(a) Periodic motion
(b) Circular motion
(c) Oscillatory (periodic) motion
(d) Periodic motion, oscillatory
(e) Circular motion
(j) Circular motion
Question 2.
Draw the two pictures of oscillatory motion.
Answer:
Hint: Do it yourself.
Measurement of Length and Motion Class 6 Case-Based Questions
Question 1.
Shetlini was riding in her bicycle along a straight road. She classified the motion of various parts of the bicycle as:
I. Rectilinear motion.
II. Circular motion.
III. Both rectilinear as well as circular motion. You have to list one part of the bicycle for each type of motion. Also support your answer with reason.
IV. What the motion of bicycle around a circular path in a fixed orbit is known?
Answer:
I. Handle of the bicycle has rectilinear motion. It moves in a straight line as the wheels of bicycle move forward.
II. Pedal of the bicycle is having circular motion it rotates with its shaft but does not move from its place.
III. Wheel of the moving bicycle is having both circular and rectilinear motion. Wheels rotate on their shafts as well as move forward on the ground.
IV. It is known as rotational motion.
Question 2.
In ancient times, people used length of a foot, the width of a finger, the distance of a step as units of measurement. This caused confusion. Some measurements are shown in figures (a), (b), (c) and (d).
I. Which measure more distance: Fig. (a) or (c).
II. What name is given to the Fig. (b)?
III. If 1 length of footstep = 3 length of foot, then 3 footsteps measure how many length of foot? OR
IV. Arrange Figs, (a), (b), (c) and (d) in decreasing order.
Answer:
I. Fig. (c) measures more.
II. Fig. (b) is called length’ of arm (cubit).
III. 3 footsteps = 3 × 3 length of foot = 9 length of foot.
IV. (c), (b), (a) and (d)