# DAV Class 6 Science Book Solution Chapter 6

DAV Class 6 Science Book Solution Chapter 6 Measurement & Motion are one of the best study materials to prepare for the DAV class 6 science examination. The DAV Solutions for Chapter 6 of class 6 science are provided here, so that students can learn the chapter more efficiently. Proper understanding of this chapter Measurement & Motion will further help the students with a few other chapters in higher classes as well.

## DAV Class 6 Science Book Solution Chapter 6 Measurement & Motion

The DAV Solutions for Class 6 Science Chapter 6 has questions and answers on measurement, SI units of measurement, Time, the concept of metre, motion in a straight line, rectilinear motion, periodic motion and circular motion. This study material has a detailed answer to all the exercise questions provided in the DAV textbook, which will help you in clearing all your doubts.

Highlights

A. Fill in the blanks.

1. The standard unit of mass is the ___________.

2. While sitting in a moving bus, we are in ___________ with respect to the surroundings.

3. A moving car, going on a narrow straight road, is having a (nearly) ___________ motion.

4. The motion, of the needle of a sewing machine, is an example of an ___________ motion.

5. The motion of the earth, around the sun, is ___________ in nature.

Answer: (1) kilogram (2) motion (3) rectilinear (4) oscillatory (5) revolution

B. Write True or False for the following statements.

1. Measurement is needed to make correct decisions.

2. A metre scale can be used for measuring the length of a playground.

3. The motion of the moon, around the earth, is a rectilinear motion.

4. The motion, of the pedal of a bicycle, is a circular motion.

5. The motion, of a giant wheel, is a rotatory motion.

6. When we draw water from a well, we are pushing at the rope.

Answer: (1) True (2) False (3) False (4) True (5) True (6) False

C. Tick the correct option.

D. Answer the following questions in brief.

1. How does measurement help us in our day-to-day life?

Answer: Measurement helps us in our day-to-day life in this way-

• We measure the distance between two objects.
• When we fall sick, we measure our temperature.

2. Which type of watch is used to measure time intervals in a ‘200 metre race?

Answer: Stopwatch is used to measure time intervals in a 200-metre race.

3. When do we consider an object to be in motion?

Answer: An object is in motion if it keeps on changing its position with respect to its immediate surroundings.

4. Name three different types of motions and give one example of each.

(1) Curvilinear motion

Example: Motion of the tip of a pen while writing.

(2) Periodic motion

Example: The motion of the hands of a clock.

(3) Oscillatory motion

Example: The swinging pendulum of a clock.

5. State the difference between a periodic’ and a ‘non-periodic’ motion.

Periodic motion- a motion is said to be periodic if it repeats itself after a regular time interval.

Non-periodic motion- a motion is said to be non-periodic if it (i) either does not repeat itself or (ii) does the repetitions in a random irregular manner.

1. Why does a measurement need both a ‘number’ and a ‘unit’ for its complete specification?

Answer: We need both the number as well as the unit to express the measurement in a proper and complete way.

2. Why is a foot step, or a hand span, not used as a standard unit of length?

A foot step or a hand span cannot be used as a standard unit of length because the length of a foot step or a hand span of different person is different. So, foot step or a hand span cannot used as a standard unit of length.

3. Radha was performing an experiment in the Science Laboratory. The metre scale, that she was using to measure the length of a string, was worn out between its 1 cm and its 2 cm marks, due to overuse.

(a) She measures the length of a string by keeping its one end at the 3.0 cm mark. If the other end of the string ‘reads’ 92.8 cm, find the length of the string.

(b) Write the precautions, to be followed, when a metre scale is being used for measuring a given length.

Answer: precautions to be followed are as: –

• Keep the scale exactly along the length to be measured.
• Zero mark of the scale should coincide with one end of the length to be measured.
• Keep the eye vertically above the end point, and in line with the reading to be taken.
• Don’t use worn out or broken portion of the metre scale for measuring length.

4. Explain the difference between ‘rest’ and ‘motion’. Give two examples of each.

Rest – An object is at rest if it does not change its position with respect to its immediate surroundings.

Example: Building and Rock

Motion – An object is in motion if it keeps on changing its position with respect to its immediate surroundings.

Example: Moving car and Walking

5. Distinguish between:

(a) Rectilinear and Curvilinear motion

(b) Rotation and Revolution

Give one example of each from our daily life.

(a) Distinguish between Rectilinear and Curvilinear motion are: –

Rectilinear motion – An object is said to have a rectilinear motion if the changes in its position, are all along a straight-line path.

Example: Falling of raindrop.

Curvilinear motion – When an object moves, from one position to another, along a curved line, the object is said to have a curvilinear motion.

Example: Motion of the tip of a pen while writing.

(b) Distinguish between Rotation and Revolution are: –

Rotation – An object is said to have a rotation if it keeps on moving ’round and round; or keeps on spinning, (about some definite ‘line’ or ‘axis) without changing its place.

Example: motion of a giant wheel.

Revolution – The motion of an object is known as a revolution, If it moves around a central point, changing its position continuously, usually following a (nearly) circular path.

Example: The Earth revolves around the Sun.

6. Define the following types of motion:

(a) Rectilinear motion

(b) Circular motion

Give one example for each of these two types of motion.

(a) Rectilinear motion – An object is said to have a rectilinear motion if the changes in its position, are all along a straight-line path.

Example: Falling of raindrop.

(b) Circular motion – When an object moves on a circular path, we then call such a motion as a Circular motion.

Example: If a ball is tied to the end of a string, and the string is whirled round and round.

## Important topics covered in DAV Class 6 Science Book Solution Chapter 6 Measurement & Motion

• What is Measurement?
• Time
• Rest and Motion
• Types of Motion
• Force

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