Q6 of 30 Page 1

A cylindrical conductor of length ‘l’ and uniform area of cross section 'A' has resistance 'R'. The area of cross section of another conductor of same material and same resistance but of length '2l’ is

Parameters of cylinder A: Length = l, Area of cross-section = A, Resistance = R and resistivity = ρ

Parameters of cylinder B: Length = 2l, Area of cross-section = A’ (To be calculated); Resistance = R and resistivity = ρ


Resistance of cylinder A can be written as, (1)



Resistance of cylinder A can be written as, (2)



Dividing 1 and 2,



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4

Question number 4(a) to 4(d) are based on table given below. Study the table in which the levels of Thyroid Stimulating Hormone (TSH) in women are given and answer the questions that follow on the basis of understanding of the following paragraph and the related studied concepts.




Women are at greater risk for developing abnormal TSH levels during menstruation, while giving birth and after going through menopause. Around 5% of women in the United State have some kind of thyroid problem compared to 3% of men. Despite claims that high TSH increases your risk for heart diseases. But a 2017 study showed that older women are especially at risk for developing thyroid cancer if they have high TSH levels along with thyroid nodules.


(a) A 35 years old women has TSH level 6.03 mU/L. what change should she bring in her diet to control this level?


(b) When do face a greater risk of abnormal TSH level?


(c) State the consequence of low TSH level.


(d) Name the mineral that is responsible for synthesis of hormone secreted by thyroid gland.


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The sky appears dark to passengers flying at very high altitudes mainly because:

 7

The maximum resistance which can be made using four resistors each of resistance 1/2 Ω is

 8

A diagram of traditional water harvesting system is given below:

The statement which defines the system and its parts is Piss



(a) This is an ideal setting of the Khadin system and A= Catchment area; B = Saline area & C= Shallow dugwell


(b) This is an ideal setting of the Shallow dugwell system and A= Catchment area; B= Saline area and C= Khadin


(c) This is an ideal setting of Catchment area and A=K hadin, B= Saline area and C= Shallow dugwell


(d) This is showing Saline area and A= Catchment area; B= Khadin and C= Shallow dugwell 1


OR


The major ill effect of mono culture practice in forests is on the


(a) biodiversity which faces large destruction


(b) local people whose basic needs can no longer be met from such forests


(c) industries


(d) forest department