CBSE Class 6 Science Advanced Physics Motion and Measurement of Distances Very Short Answer Questions Set 01

Fill in the Blanks

Question 1. No trade is possible without ____________. (transportation / Sun)
Answer:
Transportation
In simple words: Goods must be carried from one place to another before they can be bought and sold.

Teacher's Note:
1. Trade means goods move between places.
2. So transport is needed for every kind of trade.

Question 2. The determination of the size or magnitude of something is called ____________. (motion / measurement)
Answer:
Measurement
In simple words: Finding out how big or how much something is, is measurement.

Teacher's Note:
1. Measurement compares a quantity with a standard unit.
2. Motion is a change of position, a different idea.

Question 3. One metre is equal to ____________ cm. (10 / 100)
Answer:
100 cm
In simple words: A metre has 100 centimetres.

Teacher's Note:
1. Centi means one-hundredth.
2. 10 mm = 1 cm is the other common mix-up.

Question 4. SI unit of length is ____________. (m² / m)
Answer:
m (metre)
In simple words: Length is measured in metres; m² is for area.

Teacher's Note:
1. The square in m² shows that it is an area unit.
2. Length needs just one dimension.

Question 5. A body repeating its motion after certain interval of time is in ____________ motion. (Periodic / Non Periodic)
Answer:
Periodic
In simple words: Repeating after equal time gaps is periodic motion.

Teacher's Note:
1. A pendulum clock and the earth around the sun are examples.
2. Non-periodic motions do not repeat in a fixed time.

Question 6. A moving object ____________ (can / cannot) have more than one type of motion.
Answer:
can
In simple words: A rolling wheel moves forward and also spins.

Teacher's Note:
1. This is called combined motion.
2. A rolling coin on a table is another example.

Question 7. A stone thrown up in the air is an example of ____________ (linear / rotational) motion.
Answer:
Linear
In simple words: The stone goes up and comes down along a straight line.

Teacher's Note:
1. Treat the stone as a point moving along a vertical line.
2. Linear motion is also called translatory motion.

Question 8. Plucked strings of a guitar are an example of ____________ (Periodic / Non Periodic) motion.
Answer:
Periodic
In simple words: The string moves to and fro again and again at a fixed rate.

Teacher's Note:
1. Such a to-and-fro motion is also called vibratory.
2. It repeats after equal times, so it is periodic.

Question 9. In rectilinear motion, object moves in a ____________ line. (straight / zig-zag)
Answer:
straight
In simple words: Rectilinear means 'along a straight line'.

Teacher's Note:
1. Rectilinear and linear motion mean the same thing.
2. A zig-zag path would be random or curvilinear.

Question 10. Motion of a child on a swing is called as ____________. (Periodic / Non Periodic)
Answer:
Periodic (more exactly, periodic and oscillatory)
In simple words: A swing repeats its to-and-fro swing after equal times.

Teacher's Note:
1. A swing is a good example of oscillatory motion.
2. All oscillatory motions are periodic.

Question 11. Motion of the needle of a sewing machine is called as ____________. (Oscillatory / linear)
Answer:
Oscillatory
In simple words: The needle moves up and down again and again.

Teacher's Note:
1. It repeats its up-and-down path regularly.
2. A motion that repeats to and fro is oscillatory.

Question 12. Motion of the wheel of a bicycle is ____________. (linear / Circular)
Answer:
Circular
In simple words: Each point on the wheel goes round the axle.

Teacher's Note:
1. Points on a wheel move round the centre.
2. The whole cycle also moves forward, so the wheel on a moving cycle has combined motion.

True or False

Question 13. True or False: Prehistoric people used animals to carry their loads.
Answer:
True. People started to use animals to haul loads around 5000 BC.
In simple words: Early people trained animals to carry and pull loads.

Teacher's Note:
1. Before animals, people carried or dragged loads themselves.
2. Animals were used long before engines.

Question 14. True or False: We can measure the length of a curved path by a beam balance.
Answer:
False. A beam balance measures mass. The length of a curved path is measured with a thread and a ruler.
In simple words: A balance weighs things; it does not measure length.

Teacher's Note:
1. Match the instrument to the quantity.
2. A thread laid along the curve is straightened and measured.

Question 15. True or False: S.I system was introduced in year 1990.
Answer:
False. The SI system was adopted in 1960.
In simple words: SI came into use in 1960, not 1990.

Teacher's Note:
1. The metric system was created by the French in 1790.
2. Do not mix up the years 1790 and 1960.

Question 16. True or False: S.I unit of length is centimetre.
Answer:
False. The SI unit of length is the metre.
In simple words: The centimetre is a smaller unit; the metre is the SI unit.

Teacher's Note:
1. 1 cm = 1/100 m.
2. SI base units are m, kg and s.

Question 17. True or False: Rectilinear motion is when an object travels in a straight path.
Answer:
True. Rectilinear (linear) motion is motion along a straight line.
In simple words: Straight-line motion is rectilinear.

Teacher's Note:
1. A falling stone is an example.
2. Rectilinear means 'in a straight line'.

Question 18. True or False: Km/hr, m/s, km/min, m/min, m/hr are the units of speed.
Answer:
True. Speed is distance divided by time, so any unit of distance over a unit of time is a unit of speed.
In simple words: Any distance unit divided by a time unit gives a unit of speed.

Teacher's Note:
1. The SI unit is m/s.
2. km/h is used for vehicles.

Question 19. True or False: Motion of earth around the sun is random motion.
Answer:
False. The earth goes round the sun on a fixed path and returns after one year, so its motion is periodic (circular).
In simple words: The earth follows a fixed path and repeats it every year.

Teacher's Note:
1. Random motion has no fixed path or pattern.
2. One revolution takes about 365 days.

Match the Column

Teacher's Note:
1. Match the easy pairs first.
2. The pound is a non-metric unit of mass used in some countries.

Very Short Answer Type

Question 21. Define transportation.
Answer:
The process of moving people or goods from one place to another is called transportation.
In simple words: Transportation means carrying people or things from place to place.

Teacher's Note:
1. Name some land, water and air modes in your answer.
2. It is the basis of all trade.

Question 22. Define physical quantities.
Answer:
Any quantity that is studied in physics and can be measured is called a physical quantity. Length, mass and time are examples.
In simple words: A physical quantity is something we can measure with a unit.

Teacher's Note:
1. Give at least two examples, as asked in exams.
2. Every physical quantity has a number and a unit.

Question 23. How will you measure the length of a curved line?
Answer:
1. Place a thread along the curved line, keeping it tight, and mark the start and the end on the thread.
2. Straighten the thread without stretching it.
3. Measure the length between the two marks with a ruler. This gives the length of the curved line.
In simple words: Lay a thread on the curve, straighten it and measure it with a scale.

Teacher's Note:
1. A ruler alone cannot follow a curve.
2. Do not stretch the thread while straightening it.

Question 24. Distinguish between the state of rest and motion.
Answer:
Rest: a body is at rest if it does not change its position with respect to its surroundings as time passes.
Motion: a body is in motion if its position keeps changing with respect to its surroundings (or an observer) as time passes.
In simple words: At rest the position stays the same; in motion it keeps changing.

Teacher's Note:
1. Always mention 'with respect to the surroundings'.
2. Rest and motion are relative terms.

Question 25. What are the types of motion?
Answer:
The types of motion are:
1. Linear (translatory or rectilinear) motion
2. Random motion
3. Periodic motion, which is of two kinds: circular motion and oscillatory motion
4. Combined motion
In simple words: Straight, random, repeating (circular or to-and-fro) and a mix of two.

Teacher's Note:
1. Write one example for each type.
2. Circular and oscillatory are special cases of periodic motion.