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ScienceClass 6CBSE

Rules for measuring length correctly:

Accurate measurement is very important in science. The following rules should be followed: Use a proper scale: The measuring instrument should be longer than the object being measured. This ensures that the entire length can be measured easily. Correct eye position: The eye should be placed directly above the marking being read. If the eye is at an angle, it may cause an error known as parallax error. Check zero mark: If the zero mark of the scale is damaged or worn out, measurements should be taken from another clear mark (like 1 cm) and then the initial reading should be subtracted. Place the scale properly: The object should be placed along the edge of the scale and not at an angle. Avoid gaps: Ensure that there is no gap between the object and the measuring scale.

ScienceClass 6CBSE

Classify the following types of motion:

a) A man walking on a straight road → Linear motion b) Wheel of a car → Circular motion (also rotatory motion) c) Falling stone → Linear motion

ScienceClass 6CBSE

Examples of different types of motion:

Linear motion: Motion in a straight line, e.g., a car moving on a straight road. Circular motion: Motion along a circular path, e.g., blades of a fan. Rotatory motion: Motion of an object rotating about its own axis, e.g., Earth rotating on its axis.

ScienceClass 6CBSE

Convert the height of a person (1.65 m) into cm and mm

1 metre = 100 cm and 1 metre = 1000 mm Height in cm = 1.65 × 100 = 165 cm Height in mm = 1.65 × 1000 = 1650 mm

ScienceClass 6CBSE

Find the length of a knitting needle.

Reading at one end = 3.0 cm Reading at the other end = 33.1 cm Length of needle = 33.1 – 3.0 = 30.1 cm

ScienceClass 6CBSE

Give two examples of modes of transport used on land.

Common land transport includes: Buses Cars These are widely used for traveling on roads.

ScienceClass 6CBSE

Name two devices used to measure length.

Two common devices used to measure length are: Metre scale – used for measuring medium lengths. Screw gauge – used for measuring very small lengths or thickness.

ScienceClass 6CBSE

Give an example of objects that move in a circle.

An example of circular motion is the blades of a fan, which move in a circular path around a fixed centre. Other examples include the hands of a clock and a merry-go-round.

ScienceClass 6CBSE

What is a unit?

A unit is a fixed quantity used as a standard for measuring physical quantities. Without units, measurements would not be meaningful. For example, metre is a unit of length, kilogram is a unit of mass, and second is a unit of time.

ScienceClass 6CBSE

What is measurement?

Measurement is the process of comparing an unknown quantity with a known standard quantity (unit). It helps us determine the size, length, weight, or time of an object. For example, measuring the length of a table using a metre scale.

ScienceClass 6CBSE

What do you mean by the term “year”?

A year is the time taken by the Earth to complete one full revolution around the Sun. This period is approximately 365 days. It is used as a standard unit for measuring longer durations of time.

ScienceClass 6CBSE

How many cm² are there in 1 mm³?

This statement is incorrect because cm² (square centimetre) is a unit of area, while mm³ (cubic millimetre) is a unit of volume. These two cannot be directly converted as they represent different physical quantities. Therefore, no direct conversion is possible.

ScienceClass 6CBSE

Which S.I. unit is used to measure distance between Kolkata and Patna?

To measure large distances such as between cities like Kolkata and Patna, we use the kilometre (km). It is a larger unit of length and is suitable for measuring long distances.

ScienceClass 6CBSE

What is motion?

Motion is defined as the change in position of an object with respect to time. If an object moves from one place to another, it is said to be in motion. For example, a moving car, a flying bird, or a rolling ball are all examples of motion.

ScienceClass 6CBSE

What is the unit of length in S.I. system?

The standard unit of length in the International System of Units (S.I.) is the metre (m). It is used worldwide for measuring distance or length. Larger distances are measured in kilometres (km), while smaller lengths are measured in centimetres (cm) or millimetres (mm).

ScienceClass 6CBSE

Additional Concepts

Papier-mâché is a material made from paper pulp mixed with glue or clay. It is used to make decorative items. Leftover food can be added to compost pits instead of being thrown away. Choosing eco-friendly options like banana leaf plates instead of plastic helps reduce pollution.

ScienceClass 6CBSE

Useful and Harmful Garbage

Not all garbage is harmful. Some waste materials can be reused or recycled, while biodegradable waste can be converted into compost. Proper segregation helps in utilizing waste effectively.

ScienceClass 6CBSE

Landfills and Waste Disposal

A landfill is a low-lying area where non-useful waste is dumped. However, landfills can cause pollution if not managed properly. Therefore, reducing waste and recycling are better options than dumping garbage.

ScienceClass 6CBSE

Compost vs Chemical Fertilizers

Using compost is better than chemical fertilizers for several reasons: Compost provides natural nutrients to plants It improves soil structure and fertility It is eco-friendly and inexpensive Chemical fertilizers can cause soil and water pollution Thus, composting is a sustainable and environmentally friendly practice.

ScienceClass 6CBSE

Recycling and Reuse

Recycling helps in converting waste materials into new useful products. Items like newspapers, notebooks, magazines, and envelopes can be recycled. However, plastic-coated or shiny paper cannot be recycled easily. Recycled paper is slightly different from new paper. Over time, its quality decreases, and it may be used for making carry bags or packaging materials.

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