Zero Error and Correct Way to Measure Length

Q.

How people in ancient times measured length, mass and time?

Q.

Why could you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape? [5 MARKS]

Q.

Question 19

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 the difference in their measurements?

Q.

Question 7

Four pieces of wooden sticks A, B, C and D are placed along the length of 30 cm long scale as shown in Fig. Which one of them is 3.4 cm in length?

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Question 15

Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.

(i) Sam measured it with a half metre long thread.
(ii) Gurmeet measured it with a 15 cm scale from her geometry box.
(iii) Reena measured it using her hand span.
(iv) Salim measured it using a 5 m long measuring tape.

Which one of them would get the most accurate length? Give reason for your answer.

Q. ___ is the measurement of an object from end to end.

Q.

Question 9

You are provided three scales A, B and C as shown in Fig. to measure a length of 10 cm.

For the correct measurement of the length, you will use the scale,

(a) A only

(b) B only

(c) C only

(d) Any of three scales

Q.

A piece of ribbon folded five times is placed along a 30 cm long measuring scale as shown in figure. The length of the ribbon is between (a) 1.15 m – 1.25 m (b) 1.25 m – 1.35 m (c) 1.50 m – 1.60 m (d) 1.60 m – 1.70 m.

Q.

A ______ is the fixed quantity that is used as a standard for measuring physical quantities.

Q.

Question 8

Which of the following figure shows the correct placement of a block along a scale for measuring its length?

(a)

(b)

(c)

(d)

Q. The given figure shows a ruler represented in millimeters (mm). It is used to measure the length of the pencil. Determine the length of the pencil in centimeters.

1. 0.75 cm
2. 75 cm
3. 7.5 cm
4. 0.075 cm

Q. How to measure the length of a pencil by using a ruler?
[2 marks]

Q.

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 the difference in their measurements?

Q.

Ten similar coins were stacked one above the other. When measured with a scale, the readings at the top and bottom were $1.5cm$ and $4cm$ respectively. What is the thickness of each coin?

Q.

If we have a metre scale, then how many divisions do we need to make such that each division is equal to a centimetre?

1. $20$

2. $100$

3. $10$

4. $1000$

Q.

Question 8

Which of the following figure shows the correct placement of a block along a scale for measuring its length?

(a)

(b)

(c)

(d)

Q. Rajesh measures the length of a box to be $30cm$ using a scale that has a broken left end. The actual length of the box is $29cm$. What is the zero error?

1. $30cm$
2. $1cm$
3. $29cm$
4. $59cm$

Q.

Question 9

You are provided three scales A, B and C as shown in Fig. to measure a length of 10 cm.

For the correct measurement of the length, you will use the scale,

(a) A only

(b) B only

(c) C only

(d) Any of three scales

Q. While measuring the length of an object, if the zero mark of a scale does not coincide with one of the ends of the object, then such an error is called _____ error.

1. zero
2. instrumental
3. (a) and (b) above.
4. parallax

Q.

Question 4

A piece of ribbon folded five times is placed along a 30 cm long measuring scale as shown in Fig.

The length of the ribbon is between:

(a) 1.15 - 1.25 m

(b) 1.25 - 1.35 m

(c) 1.5 - 1.6 m

(d) 1.6 - 1.70 m

Q. Metre scale is used to measure _______

Q. 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 the difference in their measurements? [5 MARKS]

Q. Each centimetre of a standard scale is divided into _____ parts.

1. $100$
2. $10$
3. $1$
4. $1000$

Q.

1 metre can be defined as distance travelled by light in $\frac{1}{299792458}$ seconds in vacuum.

1. True
2. False

Q. A metre scale is divided into ______ parts.

1. 100
2. 10
3. 1
4. 1000

Q. Which of the following is not necessary while measuring length ?

1. Placing the scale in contact with the object along its length.
2. Using full mark of the scale which is not broken.
3. Placing the eye exactly in front of the point where the measurement is to be taken
4. Using clean hands to make measuements

Q. The error that occurs when the length of an object is measured using a scale that has damaged zero mark is called:

1. Parallax error
2. Zero error
3. Numerical error
4. Angular error

Q. Rajesh measures the length of a box to be $30cm$ using a scale that has a broken left end. The actual length of the box is $29cm$. What is the zero error?

1. $1cm$
2. $30cm$
3. $29cm$
4. $59cm$