[5 Marks Each] QUE-ANS

Question 15 Marks

Ishika was asked by her teacher to measure the length of the line drawn on the blackboard. She immediately took out her scale to measure the line. But she noticed that the end of her scale is broken. She felt very sad and said to the teacher that she would not be able to measure the length of the line. Teacher consoled her and taught her a new method of measuring line using the same scale.
$(a)$ What is a scale?
$(b)$ Name devices that can be used to measure length.
$(c)$ What new method of measuring line by using a broken scale was taught by Ishika's teacher?
$(d)$ What values of Ishika is shown here?

Answer

$(a)$ A straight strip of wood, metal or plastic used for drawing straight line and measuring length.
$(b)$ Measuring tape and ruler.
$(c)$ If the end of a 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.
$(d)$ She got nervous easily and sensitive.

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Question 25 Marks

Rahul and Sonia were playing with blocks and each of them made a train out of them. Both of them thought of measuring the length of the train using their handspan. By that time Rahul's friend Anupam came and suggested them to measure with a measuring tape for fair result.
$(a)$ What is a handspan?
$(b)$ Why Anupam asked both of them to use measuring tape?
$(c)$ What value of Anupam is shown here?

Answer

$(a)$ The distance between the tip of the thumb and tip of the little finger of a fully stretched hand is called handspan.
$(b)$ To get the accurate result which is not possible with the handspan.
$(c)$ Anupam is an intelligent and active boy.

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Question 35 Marks

What is meant by $(a)$ circular motion and $(b)$ rotational motion? Give two examples of circular motion and two examples of rotational motion.

Answer

$(a)$ Circular motion: When an object moves along a circular path, it is called a circular motion.
Example:
$(i)$ The movement of moon around the earth
$(ii)$ The movement of earth around the sun
$(b)$ Rotational motion: When an object twines or spins about a fixed axis, it is called rotational motion.
Example:
$(i)$ The motion of a spinning top
$(ii)$ The spinning of earth on its axis.

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Question 45 Marks

What are the reasons for which $SI$ system is recommended?

Answer

$SI$ system is recommended for the following reasons:
$1.$ It is standardised unit, therefore, it is accepted universally.
$2.$ Even minute measurements are possible in this system.
$3.$ Interconversions within the system make calculation easy.
$4.$ The units do not change with time or place.

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Question 55 Marks

State the procedures for the measurement of length using a metre scale.

Answer

While measuring length using a metre scale, we must follow the steps given below:
$1.$ The ruler should be kept along the length of the object so that the zero mark on the ruler coincides with the one end of the object. The ruler should be parallel to one of the edges.
$2.$ 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.
$3.$ If the edge of the ruler is worn out or broken, the measurement should be taken from any other full mark of the ruler.

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Question 65 Marks

What is meant by a standard unit of measurement? Why is it necessary to have standard units of measurement? Name the SI unit of length. Write its symbol.

Answer

A unit of measurement which has a fixed value and does not change from person to person or place to place, is called a standard unit of measurement. It is necessary to have standard units of measurements for the sake of uniformity in measurement. The SI unit of length is metre. Its symbol is m.

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Question 75 Marks

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.

Answer

Rectilinear motion The handle of bicycle will always move in rectilinear path because it cannot execute circular or rotatory motion.
Circular motion The pedals of bicycle will always move circularly around its chain fixing system because they cannot move in forward direction without the whole chain system.
Both rectilinear and circular The wheels of bicycle will move in rectilinear as well as in circular motion because the wheel as a whole will move forward and its point or particles around the rim will execute circular motion.

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Science [5 Marks Each] QUE-ANS

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