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ScienceClass 6CBSE

Which of the following parts of our body help us in movement? (i) Bones (ii) Skin (iii) Muscles (iv) Organs choose the correct answer from the option below. (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (iv) (ii) and (iii)

: (i) and (iii) Bones form the structural framework of body called skeleton. The skeleton along with muscles helps our body parts to move. Bones are hard and cannot bend on their own. The joints help the body in moving. Muscles are like elastic bands which are attached to the bones by means of tough connecting bands called tendons. Muscles help in movement of bone through pull/contraction. Bones are wrapped up by muscles.

ScienceClass 6CBSE

Boojho was riding in 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.

Solution: Rectilinear motion: Handle of the bicycle has rectilinear It moves in a straight line as the wheels of bicycle move forward. Circular motion: Pedal of the bicycle is having circular motion it rotates with its shaft but does not move from its place. Rectilinear and circular motion: Wheel of the moving bicycle is having both circular and rectilinear motion. Wheels rotate on their shafts as well as move forward on the

ScienceClass 6CBSE

Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for difference in their measurements? (Mention any three)

Some of the reasons for difference in their measurement could be Measurement may not be along the shortest length in all three The measuring devices may not be Different measuring devices were The end of the corridor may not be easily The smallest length that could be measured by different devices may be

ScienceClass 6CBSE

How are the motions of a wheel of a moving bicycle and a mark on the blade of a moving electric fan different? Explain.

The wheels of a moving bicycle indicate circular as well as rectilinear motion. Wheels of bicycle rotate on the ground which in turn moves the bicycle forward. A blade of a moving electric fan shows only circular motion as it is not moving from one place to another.

ScienceClass 6CBSE

While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.

While sitting in a moving train, the trees appear to be moving in opposite direction because their position is changing with respect to us. While the position of co-passengers appears to be in stationary position since they are not changing with respect to us.

ScienceClass 6CBSE

Match the events related to motion in column I with the types of motions given in column II. Column I Column II (a) A moving wheel of a sewing machine (i) Circular motion (b) Movement of tip of the minute hand of a clock in one hour (ii) Rotational motion (c) A moving swing (iii) Periodic motion

Solution: Here is the correct match: Column I Column II (a) A moving wheel of a sewing machine (ii) Rotational motion (b) Movement of tip of the minute hand of a clock in one hour (i) Circular motion (c) A moving swing (iii) Periodic motion

ScienceClass 6CBSE

Four children measure the length of a table which was about 2m. Each of them used different ways to measure it. (i) Sam measured it with a half metre long thread. (ii) With a 15cm scale from her geometry box. (iii) Reena measured it using her hand span. (iv) Salim measured it using a 5m long measuring tape. Which one of them would get the most accurate length? Give reason for your

Solution: (iv) Salim measured it using a 5m long measuring tape. By using a 5m long measuring tape which is longer than the table, Salim would get the most accurate length. So, he can measure the length of the table in one go accurately.

ScienceClass 6CBSE

Write one example for each of the following type of motion. (i) Rectilinear (ii) Circular (iii) Periodic Circular and periodic

Solution: Rectilinear - An apple falling vertically Circular - The motion of a point marked on the hands of a Periodic - Motion of a child on a Circular and periodic - Blades of a rotating

ScienceClass 6CBSE

fill in the blanks. (i) Motion of an object or a part of it around a fixed point is known as motion. (ii) A body repeating its motion after certain interval of time is in motion. (iii) In rectilinear motion, object moves a line . SI unit of length is .

Solution: Circular periodic along; straight metre

ScienceClass 6CBSE

Correct the following: (i) The motion of a swing is an example of rectilinear motion. 1m = 1000cm

Solution: No, the motion of a swing is not an example of rectilinear motion. The motion of a swing is an example of periodic motion as it repeats its motion after a fixed interval of 1m = 100 Each metre (m) is divided into 100 equal divisions, called centimeter (cm).

ScienceClass 6CBSE

Which of the following does not express a time interval? (a) A day (b) A second (c) A school period Time of the first bell in the school

Solution: (d): Time of the first bell in the school Time of the first bell in the school represents a point of time, not a time interval.

ScienceClass 6CBSE

The distance between Delhi and Mumbai is usually expressed in units of (a) decametre (b) metre (c) centimetre kilometre

Solution: (d): kilometre The distance between Delhi and Mumbai is usually expressed in units of kilometre.

ScienceClass 6CBSE

A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.

Some of the reason due to which shadow was not obtained can be The screen is far away from the The beam of light from the torch is falling parallel to the screen on the The torch is kept away from the

ScienceClass 6CBSE

A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.

We can see the shadow of football lying on the ground because the ground acts as a screen for it. However, when the football is kicked high into the air it will be away from the ground, shadow disappears with height hence we cannot see the shadow of the football when it is in air.

ScienceClass 6CBSE

Using a pinhole camera a student observes the image of two of his friends, standing in sunlight, wearing yellow and red shirt respectively. What will be the colours of the shirts in the image?

Pinhole camera does not change the colour of the image. The colours of the shirts in the image will remain same as the colour of the shirt. But the image of the person will be inverted when seeing through a pinhole camera.

ScienceClass 6CBSE

Three identical towels of red, blue and green colours are hanging on a clothes line in the sun. What would be the colour of shadows of these towels?

Shadow is usually dark or black in colour. Hence, the colour of shadows of all the three towels will remain same as no light passes through them.

ScienceClass 6CBSE

Is air around us always transparent? Discuss.

Yes, air around us is transparent which makes things visible to our eyes. When thick smoke/ thick clouds, etc. are present in the air it does not remain transparent it makes visibility difficult.

ScienceClass 6CBSE

A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.

No, the colour of light will not affect the shadow because shadow is usually dark or black patch formed when an object obstructs the path of light and hence no light reaches in the shadow region.

ScienceClass 6CBSE

You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.

Solution: A transparent glass sheet can be made into translucent glass sheet without breaking it by: Applying oil, grease, butter on it or pasting a butter paper on Rubbing the surface of the glass by any abrasive material like sandpaper on

ScienceClass 6CBSE

On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?

No, a bird or an aeroplane flying high in the sky cannot cast its shadow on the ground even on a sunny day because they are flying at a higher altitude where the object cannot obtain its shadow. We can only see their shadow on the ground if they are flying very close to the ground.

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