These AP 6th Class Science Important Questions 7th Lesson Body Movements will help students prepare well for the exams.
Body Movements AP 6th Class Science 7th Lesson Important Questions and Answers
Very Short Answer Questions (2 Marks)
Question 1.
Write one example for each of the following type of motion,
i) Rectilinear
ii) Circular
in) Periodic
iv) Circular and periodic
Answer:
i. Rectilinear: Parade of army.
ii. Circular: Moving blades of a fan.
iii. Periodic: Motion of a swing.
iv. Circular and periodic: Minute hand of a clock.
Question 2.
In prehistoric times, which animals were used as means of transport?
Answer:
Horses, camels, oxen were used as means of transport.
Question 3.
What is the standard unit of measuring length?
Answer:
The standard unit of measuring length is metre.
Question 4.
Define unit of measurement.
Answer:
A quantity adopted as a standard unit of measurement of physical quantity is called a unit.
Question 5.
Give one example of linear motion.
Answer:
Motion of stone falling from a certain height.
Question 6.
What is cubit?
Answer:
A cubit is an ancient unit of measurement based on the forearm length from the middle fingertip to the elbow bottom.
Question 7.
Name the types of motion in which a body moves along a straight path.
Answer:
Rectilinear or linear motion.
Question 8.
Define motion.
Answer:
Motion is a state of object in which they are moving, that is, they are changing their place with the changing time.
Question 9.
What is periodic motion?
Answer:
Motion in which an object repeats its motion after a fixed interval of time is called periodic motion.
Examples :
- Oscillations of a pendulum.
- Motion of a swing.
Question 10.
What is meant by rectilinear motion?
Answer:
When the objects change their position with time along a straight line, this type of motion is called rectilinear motion.
Question 11.
When is an object said to be in rest?
Answer:
When the object does not change its position with respect to time and the observer the object is said to be in fest.
Question 12.
Name the invention which made a great change in modes of transport.
Answer:
Invention of wheel made a great change in modes of transport.
Question 13.
Which instrument does a tailor use for taking our body measurements?
Answer:
Tape scale is used by the tailor for taking our body measurements.
Question 14.
What is the system used for measurements now – a – days?
Answer:
S.I. system used for measurements now – a – days.
Question 15.
What is circular motion?
Answer:
When a body moves in a circular path, its motion is known as circular motion. In circular motion, the object remains at the same distance from a fixed point.
Examples:
- Motion of stone tied to a thread and whirled.
- Motion of a blade of an electric fan.
Short Answer Questions (3 Marks)
Question 16.
Define standard units of measurement.
Answer:
Standard units of measurement are the units for measuring any quantity completely and uniformly.
It does not change from person to person or place to place. Some standard units for measuring is length-metre, mass-kilogram, time- second.
Question 17.
State the precautions, which should be taken while using a metre scale to measure the length of an object.
Answer:
Precautions taken while using a metre scale to measure the length of an object are :
- The initial point of distance must coincide with the zero reading of meter scale.
- Place the scale in contact with the object along its length.
Most important, eye should be correctly positioned above the point to be measured to make a correct measurement. The scale should be perfectly horizontal.
Question 18.
Why is hand span not a correct method of measuring any kind of length?
Answer:
The size of the hand of each person can never be same, that’s why hand span is not a correct method of measuring any kind of length.
Question 19.
How are the motions of a wheel of a moving bicycle and a mark on the blade of a moving electric fan different? Explain.
Answer:
1. When the wheels of a bicycle start rotating, the bicycle moves forward (unless we apply breaks).
2. So we can see both circular and rectilinear motion in the wheels of a bicycle.
3. On the other hand, only circular motion can be seen when fan blades are in motion as the movement of blades doesn’t change the position of the fan.
Question 20.
Give a method to measure the thickness of one rupee coin.
Answer:
1. Collect ten one rupee coins and stack them.
2. Measure the height of the stacked coins in millimetres.
3. Tick the thickness of ten coins.
4. Divide the thickness by 10.
5. You will get the average thickness of one coin.
Question 21.
Give examples of periodic and oscillatory motions.
Answer:
Examples of periodic motion are :
- Motion of moon around the earth.
- Heart-beat in a healthy person.
- Motion of earth around the sun.
Examples of oscillatory motion are :
- Motion of pendulum of wall clock.
- A child on a swing.
- Motion of heart muscles in a healthy person.
Question 22.
How can a measured length be expressed?
Answer:
A measured length be expressed by
- A number describing the numerical.
- The unit in which that quantity is measured.
Question 23.
A standard unit of measurement and accepted by almost all the scientists in the world. Give an example.
Answer:
The methods used in S.l. units for measuring things depend on the devices in which the measurement never vary from person to person.
Question 24.
In our daily life, where we need measurement. Give any five examples.
Answer:
Examples of measurements:
- To measure the length of cloth before serving.
- To measure the weight of vegetables before buying.
- To build a house.
- To reach school in time.
- In buying milk.
Question 25.
What do you understand by International System of measurements? Write a short note on it.
Answer:
1. For bringing the uniformity in units, scientists have done lot of efforts on International level and prepared an unanimous standard system.
2. It is known as International Standard System.
3. It is abbreviated as SI units. In this system length is measured in metre mass in kilogram and time in second.
4. A metre is a distance equal to one million (10-7) time of the distance between equator and pole,
5. A second is 1/86400 times of a mean solar day.
6. A kilogram is equal to one thousand milligrams.
Question 26.
The figure shows a section of a grille made up of straight and curved iron bars. How would you measure the length of the bars of this section, so that the payment could be made to the contractor?
Answer:
1. We can see in the given figure that the grille is made up of two types of iron bars, straight and curved.
2. We can use a measuring tape to measure straight iron bars and to measure curved iron bars, we can use thread first and then we can evaluate the result On a scale.
Long Answer Questions (5 Marks)
Question 27.
What are the difficulties in using non – standard units?
Answer:
1. People use foot, arm, stretched palm, etc. as units of length.
2. These non – standard units (or methods) were not satisfactory because lengths of arm, foot and stretched palm vary from person to person.
3. However if there are different units of length in the different parts of the world, it is very inconvenient for the exchange of scientific information.
4. Thus the need for the standard unit been felt.
5. The unit which people agree to use as a basic unit for measurement becomes a standard unit for the group of people for the sake of uniformity.
Question 28.
What is the standard unit of measurement? Why is it required ?
Answer:
1. A unit of measurement which has a fixed value and which does not change from person to person or place to place is called a standard unit of measurement.
2. It is required to make our judgements more reliable and accurate.
3. For proper dealing, measurement should be same for everybody.
4. Thus, there should be uniformity in measurement.For the sake of uniformity,we need a common set of units of measurements.
Question 29.
Sohan was riding on his bicycle along a straight road. He classified the motion of various parts of the bicycle as
i) Rectilinear motion
ii) Circular motion and
iii) Both rectilinear as well as circular motion.
Can you list one part of the bicycle for each type of motion? Support your answer with reason.
Answer:
| S.No. | Type of motion | Part of bicycle | Reason |
| i. | Rectilinear | Handles | Rectilinear motion is observed during the movement of handles. |
| ii. | Circular | Pedals | The pedals cannot move in any other direction except circular because they are fixed to a point. |
| iii. | Both rectilinear and circular | Wheels | When the wheel rotates the bicycle moves forward too. So, rectilinear and circular motions are both shown in the wheels of a moving bicycle. |
Question 30.
Distinguish between rest and motion.
Answer:
Differences between rest and motion are as follows:
| S.No. | Rest | Motion |
| i. | A body is said to be rest when it does not change it’s position with respect to another to a stationary object. | A body is said to be a motion when it changes its position with respect to a stationary object. |
| ii. | The speed of the object must be zero. | The speed of the object is not zero. |
| iii. | Example : Sitting on a moving car. | Example : Moving car. |
Question 31.
Define motion.Explain the different types of motions.
Answer:
Motion : When the object changes its position with respect to time and the observer then the object is said to be in motion.
Different types of motions are:
- Rectilinear motion : When the objects change their position with time along a straight line, this type of motion is called rectilinear motion. Example : Motion of a falling stone.
- Circular motion : When a body moves in a circular path, its motion is known as circular motion. In circular motion, the object remains at the same distance from a fixed point. Examples : Motion of a second’s hand in a clock.
- Rotational motion : Motion in which a whole body moyes about an axis is called a rotational motion. Example: Motion of a spinning top.
- Periodic motion: Motion in which an object repeats its motion after a fixed interval of time is called periodic motion. Examples: Oscillations of a pendulum.
Question 32.
Give a brief description about the history of transport.
Answer:
1. In the ancient times, people had to walk from one place to another, as there was no mode of transport available.
2. With the passage of time, human beings started using some animals for transportation.
3. They started using boats and rafts to travel through water
4. People started using carts and chariots after invention of wheel to travel from one place to another.
5. Steam engine reduces the amount of time taken to travel from one place to another.
6. Later, petrol and diesel engines were invented which brought a huge changes in the modes of transport.
7. For transport through water, people started using motor boats and ships and – aeroplanes also came into existence as a means of air transport.
Question 33.
What is the proper way of using a measuring scale?
Answer:
1. The scale should be placed along the length to be measured.
The scale should be placed very close to the object to be measured.
2. While taking the measurement, the eyes should be correctly positioned.
The eye must be exactly vertically above the point where the measurement is to be taken.
3. Do not start measurement from the worn out or damaged the end of the scale.
If the zero end of the scale is damaged, start measurement from some other mark of the scale. Then the actual length of the object is equal to the difference between the readings at the two points.
Question 34.
Give a table to show multiples and sub – multiples of units of length, mass and time.
Answer:
Length:
- 10 mm = 1 centimeter (cm)
- 10 cm = 1 decimeter (dm)
- 10 decimeter = 100 cm = 1 metre (m)
- 10 metre =1 decameter
- 100 metre is 1 hectometer
- 1000 metre = 1 kilometer (km)
Mass:
- 1000(mg) = 1 gram (g)
- 1000 gm = 1 kilogram (kg)
- 100 kg =1 quintal
- 10 quintal =1 metric ton
Time:
- 60 seconds =1 minute
- 60 minutes =1 hour
- 24 hrs =1 day
- 365 days =1 year
- 10 years =1 decade
- 10 decades =1 century
Case Based Questions (4 Marks)
Rohith was asked by his teacher to measure the length of the line drawn on the blackboard. Immediately he took out his scale to measure the line. But he noticed that the end of his scale is broken. He felt very sad and said to the teacher that he would not able to measure the length of the line. Teacher enclosed him and thought ‘ him a new method of measuring line using the same scale.
Now answer the following the questions.
a) What is the scale?
Answer:
A straight strip of wood, metal or plastic, used for drawing, straight line and a measuring length.
b) Name the devices that can be used to measure the length.
Answer:
Measuring tape and ruler are the devices that can be used to measure the length.
c) What is the new method of measuring a line by using a broken scale was taught by Ramesh’s teacher?
Answer:
If the end of the scale is broken, one can use any full mark of the scale and then subtract the reading of this mark from the reading at the other end.
d) What value of Ramesh is shown here?
Answer:
He got nervous easily and sensitive.
2. To decide the fast and slow motion of any object, it is important to know the diatance covered by a body and the time taken to cover that distance. Read the following data which tells about the speed and time taken by four buses to cover some distances.
i) Bus A takes 3 hours to travel from one place to other at a speed of 40 km/h.
ii) Bus B takes 1.5 hours to travel from one place to other at a speed of 60 km/h.
iii) Bus C takes 2 hours to travel from one place to other at a speed of 45 km/h.
iv) Bus D takes 2.5 hours to travel from one place to other at a speed of 50 km/h.
i) What is the most suitable unit for expressing the distance travelled by bus? ( )
a) m
b) km
c) cm
d) mm
Answer:
b) km
ii) Which bus covers the maximum distance? ( )
a) A
b) B
c) C
d) D
Answer:
d) D
iii) Two statements are given below. Read them carefully and choose the correct option.
I) A bus travelling a distance of 560km in 8 hours has a speed of 60km/h.
II) A train covering a distance of 870 km in 11 hours has a speed of 60km/h. ( )
a) Only statement (I) is correct
b) Only statement (II) is correct
c) Both statement (I) and (II) are correct.
d) Both statement (I) and (II) are false.
Answer:
b) Only statement (II) is correct
iv) Which of the following statements is correct? ( )
a) Speed of a moving object can be calculated if we know the mass and distance travelled by it.
b) We can find the speed of a moving car by looking at its odometer.
c) We can find the speed of a moving object if we know the time taken and distance travelled by it.
d) We can find the time taken by a car by multiplying its speed with distance travelled by it.
Answer:
c) We can find the speed of a moving object if we know the time taken and distance travelled by it.