Question

4.
Four pieces of wooden sticks A, B, C and D are placed along the length of 30 cm long scale as shown in the figure. Which one of them is 3.4 cm in length
(a) A
(b) B
(C) C
(d) D​

Answer 1

(c) C is the answer.

We can observe from the given figure, that stick C lies between 10.4 cm and 7 cm. So, its length is (10.4 – 7) cm = 3.4 cm.

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Answer 2

Complete question:

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

(a) A

(b) B

(C) C

(d) D

Answer:

Stick C has a length of 3.4 cm.

Explanation:

To find,

The wooden stick that has a length of 3.4 cm.

Concept to be used,

Length of the stick = final reading of the scale - initial reading of the scale.

Calculation,

We analyze the length of each stick using the above concept.

For stick (A):

Length of a stick = Final reading of the scale − Initial reading of the scale.

L₁ = 2.7 − 0.3 = 2.4 cm.

For stick (B):

Length of a stick = Final reading of the scale − Initial reading of the scale.

L2 = 6.5 − 3.4 = 3.1 cm.

For stick (C):

Length of a stick = Final reading of the scale − Initial reading of the scale.

L₃ = 10.4 − 7.0 = 3.4 cm.

For stick (D):

Length of a stick = Final reading of the scale − Initial reading of the scale.

L₄ = 14.4 − 10.7 = 3.7 cm.

Hence, from above we can clearly see that stick C has 3.4 cm.

Therefore, stick C has a length of 3.4 cm

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