DAV Class 6 Science Solution Chapter 6 Measurement and Motion

DAV Class 6 Science Solution Chapter 6 Measurement and Motion

DAV School Books Class 6 Science Solution Chapter 6 Measurement and Motion all Question Answer. DAV Class 6 6th Chapter Measurement and Motion full Chapter explanation by expert teacher.

DAV School Books Class 6 Science Solution Chapter 6 Measurement and Motion:

(A) Fill in the blanks.

Answer: (1) Kilogram.

Answer: (2) Motion.

Answer: (3) Rectilinear.

Answer: (4) Oscillatory.

Answer: (5) Revolution.

(B) Write True or False for the following statements.

Answer: (1) True.

Answer: (2) False.

Answer: (3) False.

Answer: (4) True.

Answer: (5) True.

Answer: (6) False.

(C) Tick (✓) the correct option.

(1) The standard unit of length is the _____.

Answer:- (a) Meter.

(2) The standard unit of time is the _______.

Answer:- (a) Second.

(3) The motion, of the tip of a pen, while writing, is a/an ______.

Answer:- (c) Curvilinear motion.

(4) Which of the following four ‘motions’ is different from the other three?

Answer:- (d) A fruit falling from a tree.

(5) The motion of a swinging pendulum is a/an ______.

Answer:- (c) Oscillatory motion.

(D) Answer the following questions in brief.

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

Answer:- Measurement is very important in our day to day life like

(1) We can measure the grocery, vegetables and fruits

(2) We can measure the clothes for stitching

(3) We can measure the temperature when we have a fever.

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

Answer:- The watch used to measure the time interval for race is stopwatch.

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

Answer:- When an object continuously changes its position from one place to another place with respect to time that time we can consider the object is in motion.

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

Answer:- 3 different types of motion

1.) Oscillatory motion

Example – a clock pendulum.

2.) Rectilinear motion

Example-motionofcarandbus.

3.) non periodic motion

Example – playing football

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

Answer:- The difference between the periodic and non periodic motion are –

(1) Periodic motion – when a motion repeats itself after a regular interval of time is called periodic motion.

(2) Non- periodic motion – when a motion does not repeat itself after the regular interval of time is called non- periodic motion.

(E) Answer the following questions.

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

Answer:- To express the measurement accurately and properly it needs both numbers as well as units.

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

Answer:- The length of hand span and footsteps of every person is different so they are not 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:-

(A) To find out the length of string we need to subtract initial length from the final length Length of string = Final length – initial length.

= 92.8 – 3.0

= 89.8cm.

B) (1) Keep the scale properly according to length.

(2) Don’t use the broken meter scale.

(3) The 0 mark should coincide with one end.

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

Answer:

Rest

(1) When an object does not change its position with respect to its immediate surroundings then the object is at rest.

(2) Ex:- The bed lying in a room is at rest with respect to the wall of the room.

Motion

(1) When an object changes its position with respect to its immediate surroundings then the object is in motion.

(2) Ex:- Cars running on the road are in motion with respect to the lamp posts, trees or bus stops on the roadside.

(5) Distinguish between:

(a) Rectilinear and Curvilinear motion

(b) Rotation and Revolution

Give one example of each from our daily life.

Answer:

A.) Rectilinear Motion

(1) In all the cases when objects concerned are moving along a straight path is known as rectilinear motion.

(2) Ex:- Moving train.

Curvilinear motion

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

(2) Ex:- The motion of the tip of the pen while writing.

B.) Rotation

(1) When an object keeps on moving round and round without changing its position is known as rotation.

(2) Ex:- merry go round, fan.

Revolution

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

(2) Ex:- 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.

Answer:-

(a) Rectilinear Motion

• In all the cases when objects concerned are moving along a straight path is known as rectilinear motion.
• Ex:- Moving train.
• Circular motion
• In all the cases when an object moves in a circular path is known as circular motion.
• Ex:- Merry go round.

Value based questions

Q.) When Karni’s mother saw her school calendar, she noticed that the annual sports day was still four months away. She, however, advised Karni to follow a regular, systematic practice schedule, right from the start. Karni followed her advice and did not deviate at all from her regular practice. On the sports day, she won the first prize in her event. Her mother told her that she succeeded in her efforts because she did her practice in a way similar to that of an object having a rectilinear motion.

(1) Why did Karni’s mother compare her practice schedule with that of an object having a rectilinear motion?

Answer:- Rectilinear Motion is always in a straight path, in the same way success should move forward in a correct way.

(2) State the values displayed by Karni.

Answer:- systematic practice schedule, right from the start.

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