Issiqlik hodisalari — Masalalar yechish — 7-sinf Fizika test savollari

1.1-masalada metall jismning massasi necha kg bo'lgan?

• A)0,1 kg
• B)100 kg
• C)1 kg
• D)0,01 kg

2.2-masalada birinchi idishdagi suvning hajmi necha litr edi?

• A)45 l
• B)20 l
• C)30 l
• D)25 l

3.3-masalada qaynoq suv atrofga necha kJ issiqlik miqdorini uzatib sovigan?

• A)100 kJ
• B)672 kJ
• C)1680 kJ
• D)4 kJ

4.22-mashqning 4-masalasida jismning massasi necha kg edi?

• A)2 kg
• B)3 kg
• C)2,5 kg
• D)1,5 kg

5.22-mashqning 6-masalasida suvning dastlabki temperaturasi necha daraja edi?

• A)45 °C
• B)100 °C
• C)20 °C
• D)28 °C

6.Massasi 0,1 kg bo'lgan metall jism 20 °C dan 130 °C gacha isishi uchun 4180 J issiqlik miqdori olgan bo'lsa, uning solishtirma issiqlik sig'imini toping.

• A)$321,5\frac{J}{kg\cdot °C}$
• B)$380\frac{J}{kg\cdot °C}$
• C)$0,38\frac{J}{kg\cdot °C}$
• D)$3,8\frac{J}{kg\cdot °C}$

7.Hajmi 20 l bo'lgan idishdagi 45 °C temperaturali suvda qancha issiqlik miqdori bor ($c=4200\frac{J}{kg\cdot °C},\rho =1000$ kg/m³)?

• A)1680000 J
• B)1890000 J
• C)900 J
• D)3780000 J

8.Hajmi 4 l, temperaturasi 100 °C bo'lgan qaynoq suv atrofga 672 kJ issiqlik miqdorini uzatib sovigan bo'lsa, suvning yangi temperaturasi qancha bo'lib qolgan ($c=4200\frac{J}{kg\cdot °C},\rho =1000$ kg/m³)?

• A)60 °C
• B)100 °C
• C)140 °C
• D)40 °C

9.22-mashq, 3-masala: massasi 3 kg bo'lgan jism 20 °C dan 500 °C gacha qizganda 1267,2 kJ issiqlik miqdori olgan bo'lsa, jismning solishtirma issiqlik sig'imini toping.

• A)$844,8\frac{J}{kg\cdot °C}$
• B)$422400\frac{J}{kg\cdot °C}$
• C)$880\frac{J}{kg\cdot °C}$
• D)$8800\frac{J}{kg\cdot °C}$

10.22-mashq, 4-masala: massasi 2,5 kg bo'lgan jism 28 °C dan 100 °C ga ko'tarilguncha 68,4 kJ issiqlik miqdorini olgan bo'lsa, uning solishtirma issiqlik sig'imini toping.

• A)$380\frac{J}{kg\cdot °C}$
• B)$273,6\frac{J}{kg\cdot °C}$
• C)$27360\frac{J}{kg\cdot °C}$
• D)$3800\frac{J}{kg\cdot °C}$