Misalan Tambayoyi 5 na Canja wurin Zafi
1. An haɗa sanduna biyu na P da Q masu girman iri ɗaya amma nau'ikan ƙarfe daban-daban kamar yadda aka nuna a cikin hoton da ke ƙasa. Idan ma'aunin watsa wutar lantarki na P ya ninka ma'aunin watsa wutar lantarki na Q sau biyu, to zafin da ke iyakar P da Q shine...
A. 600 oC
B. 200 o C
C. 100 o C
D. 90 o C
E. 60 o C
Tattaunawa
An san cewa:
Sanduna biyu P da Q suna da girman iri ɗaya
Ma'aunin watsa wutar lantarki na zafi P ya ninka ma'aunin watsa wutar lantarki na zafi Q sau biyu
Zafin ƙarshen sandar P shine 90 o , zafin ƙarshen sandar Q shine 0 o kuma zafin da ke tsakanin sandunan P da Q shine T.
Tambaya: Zafin jiki a layin iyaka P da Q
Amsa:
Tsarin da ake amfani da shi wajen canja wurin zafi ta hanyar amfani da na'urar sadarwa :
Bayani: Q/t = ƙimar canja wurin zafi, k = ƙarfin watsa zafi, A = yankin giciye, T 1 = babban zafin jiki, T 2 = ƙarancin zafin jiki, l = tsawon abu.
Sanduna biyu P da Q suna da girman iri ɗaya don haka yankin saman (A) da tsayi (l) sun ɓace daga lissafin. Lissafin da ke sama ya canza zuwa:
Ma'aunin watsa wutar lantarki na zafi P ya ninka ma'aunin watsa wutar lantarki na zafi Q sau biyu. Ma'aunin da ke sama ya canza zuwa:
Zafin saman sandar P shine 90 o , zafin saman sandar Q shine 0 o kuma zafin da ke tsakanin sandunan P da Q shine T. Lissafin da ke sama ya canza zuwa:
Zafin da ke kan layin iyaka na P da Q shine 60 oC.
Amsar da ta dace ita ce E.
2. Sandunan A da B suna da yanki da tsayi iri ɗaya na giciye. Idan ma'aunin watsawa na sandar A = 1/4 sau ma'aunin watsawa na sandar B, to duka biyun za a dumama su a ƙarshen ɗaya kuma ya zama cewa duka biyun suna fuskantar canjin zafin jiki iri ɗaya. Sannan rabon saurin canja wurin zafi na sandar A da sandar B shine…..
A. 1: 4
B. 1: 2
C. 1: 1
D. 2: 1
E. 4: 1
Tattaunawa
An san cewa:
Yankin giciye na sandar A (A) = yankin giciye na sandar B (A)
Tsawon sandar A (l) = tsawon sandar B (l)
Ma'aunin ma ...
Canjin zafin jiki na sandar A (ΔT) = canjin zafin jiki na sandar B (ΔT)
Ana so: Kwatanta saurin canja wurin zafi na sandar A da sandar B
Amsa:
Tsarin da ake amfani da shi wajen canja wurin zafi ta hanyar amfani da na'urar sadarwa:
Bayani: Q/t = ƙimar canja wurin zafi, k = ƙarfin watsa zafi, A = yankin giciye, T 2 = zafin jiki mai yawa, T 1 = ƙarancin zafin jiki, l = tsawon abu.
Yankin giciye iri ɗaya ne, tsawon sandar iri ɗaya ne, canjin zafin jiki iri ɗaya ne.
Amsar da ta dace ita ce E.
3. Sandunan ƙarfe guda biyu A da B masu girman iri ɗaya kowannensu yana da ma'aunin sarrafawa na 2k da k bi da bi.
Dukansu an haɗa su tare kuma ana sanya ƙarshen kyauta a yanayin zafi kamar yadda aka nuna a cikin hoton.
Zafin jiki (T) a haɗin ƙarfe na A da B shine...
A. 80 o C
B. 100 o C
C. 120 o C
D. 150 o C
E. 160 o C
Tattaunawa
An san cewa:
Sandunan ƙarfe guda biyu A da B suna da girman iri ɗaya
Ma'aunin watsawa na ƙarfe A = 2k
Ma'aunin sarrafa ƙarfe B = k
Zafin ƙarfe na ƙarshen A = 210 oC
Zafin ƙarfe B = 30 oC
Ana so: Zafin jiki (T) a gidajen ƙarfe A da B
Amsa:
Tsarin da ake amfani da shi wajen canja wurin zafi ta hanyar amfani da na'urar sadarwa :
Bayani: Q/t = ƙimar canja wurin zafi, k = ƙarfin watsa zafi, A = yankin saman, T 1 -T 2 = canjin zafin jiki, l = tsawon sandar
Sandunan ƙarfe guda biyu A da B girmansu iri ɗaya ne don haka an cire yankin saman (A) da tsawon (l) na sandunan daga lissafin.
Amsar da ta dace ita ce D.
4. An haɗa sandunan gudanarwa guda biyu masu tsayi iri ɗaya da yankin giciye tare kamar yadda aka nuna a cikin hoton da ke ƙasa. Ma'aunin watsa wutar lantarki na sandar gudanarwa ta biyu = sau biyu ma'aunin watsa wutar lantarki na sandar farko. Idan an dumama sandar farko ta yadda T 1 = 100 oC da T 2 = 25 oC , to zafin da ke wurin haɗin gwiwa (T) shine ...
A. 30 oC
B. 35 o C
C. 40 o C
D. 45 o C
E. 50 o C
Tattaunawa
An san cewa:
Sandunan ƙarfe guda biyu A da B suna da girman iri ɗaya
Ma'aunin sarrafawa na sanda I = k
Ma'aunin sarrafawa na sanda II = 2k
Zafin ƙarshen sandar I = 100 o C
Zafin sanda II = 25 oC
An tambaya: Zafin jiki a wuraren haɗin sandunan I da II
Amsa:
Tsarin da ake amfani da shi wajen canja wurin zafi ta hanyar amfani da na'urar sadarwa:
Bayani: Q/t = ƙimar canja wurin zafi, k = ƙarfin watsa zafi, A = yankin saman, T 1 -T 2 = canjin zafin jiki, l = tsawon sandar
Zafin jiki a layin iyaka P da Q:
Sandunan ƙarfe guda biyu A da B girmansu iri ɗaya ne don haka an cire yankin saman (A) da tsawon (l) na sandunan daga lissafin.
Amsar da ta dace ita ce C.
5. Sandunan ƙarfe guda uku daban-daban na A, B da C amma suna da tsayi iri ɗaya da kuma yankin giciye, an haɗa su da juna kamar yadda aka nuna a hoton da ke ƙasa.
Babban ƙarfin lantarki 4 kA = 2kB = kuC da kuma T1 = 100oC da T4 = 20oC sannan zafin jiki T2 da kuma T3 shine…
A. T 2 = 54,26 o C, T 3 = 31,4 o C
B. T 2 = 31,4 o C, T 3 = 54,26 o C
C. T 2 = 32,4 o C, T 3 = 54,26 o C
D. T 2 = 56,26 o C, T 3 = 31,4 o C
E. T 2 = 54,26 o C, T 3 = 30,4 o C
Tattaunawa
An san cewa:
T 1 = 100 o C
T 4 = 20 oC
4 k A = 2 k B = k C
Idan k C = 4, k B = 2, k A = 1
An tambaya: T 2 da T 3
Amsa:
Tsarin canja wurin zafi ta hanyar sadarwa:
Bayani:
Q/t = ƙimar canja wurin zafi, k = ƙarfin jure zafi, A = yankin giciye, T 1 = zafin farko, T 2 = zafin ƙarshe, l = tsawon sandar.
Tsawon (l) da yankin giciye (A) daidai suke don haka an cire su daga lissafin.
Yi amfani da wannan lissafi don ƙididdige zafin jiki.
Ka yi la'akari da sandunan ƙarfe A da B.
Ka yi la'akari da sandunan ƙarfe na B da C.
Kawar da lissafi na 1 da lissafi na 2:
Lissafa T2 ta amfani da lissafi na 1:
Amsar da ta dace ita ce A.
Tushen tambaya:
Tambayoyin Nazarin Fizik na Ƙasa ga Makarantar Sakandare ta Babbar Sakandare/Makarantar Sakandare ta Sana'a
