Class 6 Science Time And Motion Oxford Solution

This chapter of the Class 6 Science Time and Motion Oxford Solution, focusing on the importance of accurate measurement and the different ways objects move.

Measurement: It explains why standard units are necessary for consistent and reliable measurements, moving from non-standard units like hand spans to the globally accepted SI units (e.g., metre for length, second for time).
Types of Motion: The chapter classifies motion into several categories:
- Translational Motion: An object moves from one place to another. This includes rectilinear (straight line) and curvilinear (curved path) motion.
- Rotational Motion: An object spins on a fixed axis (like a spinning top).
- Periodic Motion: Motion that repeats itself at regular intervals (like a swinging pendulum).
- Random Motion: Motion with no fixed direction or path.

Class 6 Science Time and Motion Oxford Textbook

I. Objective type questions

Question 1:
This is a modern mode of transport, that has come into use only recently.
a. Boat
b. Horse riding
c. Aeroplane
d. Bullock cart

Answer: c. Aeroplane
Reason: Boats, bullock carts, and horse riding are very old means of transport. Aeroplanes were invented only in the last century and are a modern mode of transport.

Question 2:
Susheel lives 250 km away from his uncle’s house. Which of the following means of transportation would be appropriate if his family wants to go to his uncle’s house?
a. Walking
b. On a bicycle
c. Train
d. On horseback

Answer: c. Train
Reason: Walking, cycling, or horseback riding is not suitable for such a long distance of 250 km. A train is faster and more comfortable for long-distance travel.

Question 3:
This is an example of a standard unit of length.
a. Cubit
b. Kilometre
c. Hand span
d. Pace

Answer: b. Kilometre
Reason: Cubit, hand span, and pace are non-standard units that vary from person to person. Kilometre is a fixed, standard unit of length.

Question 4:
The SI unit of length is
a. kilometre
b. inch
c. metre
d. millimetre

Answer: c. metre
Reason: According to the International System of Units (SI), the standard unit of length is the metre.

Question 5:
A measuring tape is a
a. standard unit of length
b. measuring instrument
c. a non-standard unit of length
d. a unit of distance

Answer: b. measuring instrument
Reason: A measuring tape is not a unit, but a tool used to measure lengths accurately.

Question 6:
When a vehicle is moving on a road, it is moving with respect to
a. the trees on the road
b. electric poles on the road
c. the buildings by the roadside
d. all of these

Answer: d. all of these
Reason: Motion is always relative to another object. A moving vehicle changes its position with respect to trees, poles, and buildings, so the correct answer is all of these.

Question 7:
We can measure the length of a curved line with
a. a ruler alone
b. a ruler and string
c. a clock
d. a divider

Answer: b. a ruler and string
Reason: A curved line cannot be measured directly with a ruler. First, a string is placed along the curve, then the string’s length is measured using a ruler.

Question 8:
Translational, rotational, and periodic refer to
a. types of motion
b. measurements of lengths
c. modes of transport
d. none of the above

Answer: a. types of motion
Reason: Objects can move in different ways. Moving from one place to another is translational motion, spinning is rotational motion, and repeating movements like a swing are periodic motion.

Question 9:
20 cm equals
a. 200 m
b. 20 m
c. 200 mm
d. 20 km

Answer: c. 200 mm
Reason: 1 cm = 10 mm. Therefore, 20 cm = 20 × 10 = 200 mm.

Question 10:
When an object in translational motion moves in a straight line, it is said to be in
a. curvilinear motion
b. rotational motion
c. rectilinear motion
d. both a. and b.

Answer: c. rectilinear motion
Reason: Translational motion along a straight line is called rectilinear motion, while curvilinear motion refers to motion along a curved path.

A. Fill in the blanks with the correct word.

Yard is a unit of length.
Standard units do not vary from person to person or place to place.
A train travelling on a straight track is an example of translational motion.
The blades of a working fan show rotational motion.
A swinging pendulum executes periodic motion.

II. Very short answer type questions

A. Give two examples for the following.

Ancient modes of transport: Bullock cart, horse riding.
Modern modes of transport: Aeroplane, car, train.
Modes of transport in air: Aeroplane, helicopter.
Non-standard units of length: Hand span, cubit, pace, foot.
Standard units of length: Metre, kilometre.

B. Define/explain the following.

Transportation: The movement of people or goods from one place to another.
Translational motion: The motion of an object as a whole from one point to another, where all parts of the object move in the same direction. Example: A car moving on a straight road. 3. Standard unit: A fixed and globally accepted unit for measurement that does not change from person to person or place to place.
Periodic motion: A motion that repeats itself at regular intervals of time. Example: A swinging pendulum or the motion of the Earth around the Sun.

II. Short answer type questions

Name any two inventions that revolutionized transportation.

Ans: The invention of the wheel and the steam engine revolutionised transportation. The wheel made it possible to move heavy loads easily, while the steam engine powered trains and ships, allowing for faster and more efficient travel over long distances. 🚂

IV. Long answer type questions

1. Write a short note on how transportation has evolved from ancient to modern times.

Ans: Transportation has evolved from simple methods like walking and using animals for carrying goods to complex modern systems. In ancient times, people relied on animal-drawn carts (like the bullock cart) and boats. The invention of the wheel was a major breakthrough. Later, the steam engine powered trains and ships, drastically reducing travel time. The invention of the internal combustion engine led to the development of automobiles and aeroplanes, which are the main modes of modern transport. Today, we have high-speed trains, jets, and sophisticated logistics networks.

2. Discuss the importance of having standard units of measurements.

Ans: Standard units of measurement are crucial for several reasons. They ensure uniformity and accuracy in measurements. Without them, a measurement would differ depending on who is measuring and where. This would lead to chaos in trade, science, and everyday life. Standard units facilitate global communication and collaboration in fields like science, engineering, and commerce. For example, a metre is the same length everywhere in the world. The Systeme Internationale (SI) is the most widely used system of standard units.

3. Name two instruments that can be used to measure length. Explain how a ruler can be used to measure length.

Ans: Two instruments used to measure length are a ruler and a measuring tape. How to use a ruler:
Place the ruler along the object you want to measure.
Make sure the zero mark of the ruler is aligned with the starting point of the object.
Read the marking on the ruler at the end point of the object. This reading gives the length of the object.

Tip: To get an accurate reading, place your eye directly above the mark to avoid parallax error. 📏

4. List the precautions to be taken while making measurements with a ruler.

Correct placement: Place the ruler’s zero mark exactly at the starting point of the object.
Correct eye position: Look at the reading with your eye directly above the mark to avoid errors caused by viewing from an angle (parallax error).
Broken ruler: If the zero mark is broken or worn out, use another full mark (e.g., the 1 cm mark) as the starting point. Subtract this value from the final reading to get the correct length.
Tightly stretched string: When measuring a curved line with a string, make sure the string is stretched taut along the curve.

5. In what situation would it be more appropriate to use a string along with a ruler to make length measurements? Explain how such a measurement would be made.

Ans:

When to use a string with a ruler:

A string is useful for measuring the length of curved objects or irregular paths where a ruler cannot be placed directly (for example, the circumference of a circular object, the edge of a curved bottle, or a bent wire).
A ruler is straight, so it only works well for straight-line measurements.
For curved surfaces, the ruler will leave gaps, making the measurement inaccurate. That’s why we use a string first.

How the measurement is made:

The length of the string shown on the ruler is the required measurement of the curve.
Take a piece of string and place it carefully along the curved surface or edge of the object.
Make sure the string follows the curve exactly without stretching.
Mark the point on the string where the curve ends.
Now, straighten the string and place it against a ruler.

V. Numericals

Akshay needs 465 cm of cloth to stitch his uniform. Anil needs three and a half metres. Who needs more cloth for his uniform? By how much?

Solution: Akshay needs 465 cm of cloth.
Anil needs 3 and a half metres = 350 cm of cloth.
465 cm is more than 350 cm.
Difference = 465 − 350 = 115 cm.

2. Priya lives in a hostel 135000 m away from her parent’s house. Express the distance in kilometres.

Ans: Distance from hostel to parent’s house = 135000 m
1 kilometre = 1000 metres
135000 ÷ 1000 = 135 km

Measurement of length

SI Unit: Metre
Other common units: Centimetre, Kilometre, Millimetre
Can be done using:
1. A ruler
2. A measuring tape
3. A scale
4. A string (for curved lines)

Types of motion

Translational: An object moves from one point to another.
Rotational: An object spins on an axis.
Periodic: A motion that repeats after a fixed interval.
Rectilinear: An object moves in a straight line.
Curvilinear: An object moves in a curved path.
Random: Motion that has no specific path or direction.

Class 6 Science Time and Motion Oxford – Complete Chapter Links

Class 6 science oxford book Solutions-All Chapters

Welcome to the solutions for the Oxford Class 6 science oxford book Solutions-All Chapters! Below is a list of all the chapters with links to their solutions. Click on any chapter to access detailed answers, explanations, and helpful study notes.

Chapter 1: Food
Chapter 2: Components of Food
Chapter 3: Separation of Substances
Chapter 4: Fibre to Fabric
Chapter 5: Sorting Materials into Groups
Chapter 6: Changes Around Us
Chapter 7: Things Around Us
Chapter 8: Getting to Know Plants
Chapter 9: Form and Body Movements
Chapter 10: Habitat of the Living
Chapter 11: Measurement & Motion
Chapter 12: Fun with Magnets
Chapter 13: Light, Shadows and Reflections
Chapter 14: Electricity and Circuits
Chapter 15: Water
Chapter 16: Air Around Us
Chapter 17: Garbage In, Garbage Out

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