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1-Introduction  1-مقدمة

Q 1  س 1 ___ is the movement of thermal energy from a warmer item to a cooler item.
___ هي حركة الطاقة الحرارية من عنصر أكثر دفئا إلى عنصر أكثر برودة.
A Temperature  درجة الحرارة B Heat transfer  نقل الحرارة
C Air conditioning and Refrigeration
تكييف الهواء والتبريد		 D Thermodynamic  ديناميكي حراري
E All of the above  كل ما سبق
Q 2  س 2 All modes of heat transfer require the existence of
تتطلب جميع طرق نقل الحرارة وجود
A A temperature differences
الاختلافات في درجات الحرارة		 B A pressure differences  اختلافات الضغط
C A distance differences  فروق المسافة D A humidity differences  أ اختلافات الرطوبة
E None of the above  لا شيء مما سبق
Q 3  س 3 If the fluid is forced to flow over the surface by external means convection is called
إذا أجبر السائل على التدفق على السطح بوسائل خارجية ، يطلق عليه الحمل الحراري
A Natural convection  الحمل الحراري الطبيعي B Forced convection  الحمل الحراري القسري
C Normal convection  الحمل الحراري الطبيعي D All of them  كلهم
E None of the above  لا شيء مما سبق
Q 4  س 4 The rate of heat generation ( g ∘ g ∘ g^(@)\mathrm{g}^{\circ} ) in a medium is usually specified
عادة ما يتم تحديد معدل توليد الحرارة ( g ∘ g ∘ g^(@)\mathrm{g}^{\circ} ) في الوسط
A per unit volume  لكل وحدة حجم B per unit area  لكل وحدة مساحة
C per unit surface area  لكل وحدة مساحة D per unit length  لكل وحدة طول
E per unit mass  لكل وحدة كتلة
Q 5  س 5 There can be no net heat transfer between two mediums that are
لا يمكن أن يكون هناك صافي نقل للحرارة بين وسطين
A At the same material  في نفس المادة B At the same temperature  في نفس درجة الحرارة
C At the same thickness  بنفس السماكة D All of the above  كل ما سبق
E None of the above  لا شيء مما سبق
Q 6  س 6 Heat transfer has direction as well as magnitude which means
نقل الحرارة له اتجاه وكذلك الحجم مما يعني
A A vector quantity.  كمية متجهة. B Quantitative amount  الكمية الكمية
C Directional amount  كمية الاتجاه D All of the above  كل ما سبق
E None of the above  لا شيء مما سبق
Q 7  س 7 The thermal conductivity is mostly function of
الموصلية الحرارية هي في الغالب وظيفة
A Temperature  درجة الحرارة B Freezing point  نقطة التجمد
Q 1 ___ is the movement of thermal energy from a warmer item to a cooler item. A Temperature B Heat transfer C Air conditioning and Refrigeration D Thermodynamic E All of the above Q 2 All modes of heat transfer require the existence of A A temperature differences B A pressure differences C A distance differences D A humidity differences E None of the above Q 3 If the fluid is forced to flow over the surface by external means convection is called A Natural convection B Forced convection C Normal convection D All of them E None of the above Q 4 The rate of heat generation ( g^(@) ) in a medium is usually specified A per unit volume B per unit area C per unit surface area D per unit length E per unit mass Q 5 There can be no net heat transfer between two mediums that are A At the same material B At the same temperature C At the same thickness D All of the above E None of the above Q 6 Heat transfer has direction as well as magnitude which means A A vector quantity. B Quantitative amount C Directional amount D All of the above E None of the above Q 7 The thermal conductivity is mostly function of A Temperature B Freezing point| Q 1 | ___ is the movement of thermal energy from a warmer item to a cooler item. | | | | :---: | :---: | :---: | :---: | | A | Temperature | B | Heat transfer | | C | Air conditioning and Refrigeration | D | Thermodynamic | | E | All of the above | | | | Q 2 | All modes of heat transfer require the existence of | | | | A | A temperature differences | B | A pressure differences | | C | A distance differences | D | A humidity differences | | E | None of the above | | | | Q 3 | If the fluid is forced to flow over the surface by external means convection is called | | | | A | Natural convection | B | Forced convection | | C | Normal convection | D | All of them | | E | None of the above | | | | Q 4 | The rate of heat generation ( $\mathrm{g}^{\circ}$ ) in a medium is usually specified | | | | A | per unit volume | B | per unit area | | C | per unit surface area | D | per unit length | | E | per unit mass | | | | Q 5 | There can be no net heat transfer between two mediums that are | | | | A | At the same material | B | At the same temperature | | C | At the same thickness | D | All of the above | | E | None of the above | | | | Q 6 | Heat transfer has direction as well as magnitude which means | | | | A | A vector quantity. | B | Quantitative amount | | C | Directional amount | D | All of the above | | E | None of the above | | | | Q 7 | The thermal conductivity is mostly function of | | | | A | Temperature | B | Freezing point |
C Materials melting point  نقطة انصهار المواد D surface area  المساحه
E None of the above  لا شيء مما سبق
C Materials melting point D surface area E None of the above | C | Materials melting point | D | surface area | | :--- | :--- | :--- | :--- | | E | None of the above | | |
Q 8  س 8 The Stefan-Boltzmann law of thermal radiation is applicable for
ينطبق قانون ستيفان بولتزمان للإشعاع الحراري على
A White body  جسم أبيض B Grey body  جسم رمادي
C Black body  جسم أسود D All of the above  كل ما سبق
E None of the above  لا شيء مما سبق
Q 9  س 9 ......... is the energy emitted by matter in the form of electromagnetic wave as a result of changes in electronic configurations of atoms.
......... هي الطاقة المنبعثة من المادة على شكل موجة كهرومغناطيسية نتيجة للتغيرات في التكوينات الإلكترونية للذرات.
A Conduction  التوصيل B Convection  الحراري
C Radiation  إشعاع D All of the above  كل ما سبق
E None of the above  لا شيء مما سبق
Q 10  س 10 Heat can be generated inside some bodies because of ___
يمكن أن تتولد الحرارة داخل بعض الأجسام بسبب ___
A Passage of electric power inside it
مرور الطاقة الكهربائية بداخله		 B Chemical reaction inside it cpassing of specific
تفاعل كيميائي بداخله يمر بمعين
C electromagnetic wave though it
الموجة الكهرومغناطيسية على الرغم من ذلك		 D all of the stated  كل ما ذكره
E None of the above  لا شيء مما سبق
Q 11  س 11 According to Newton law of cooling, the rate of heat transfer increase with the increase of
وفقا لقانون نيوتن للتبريد ، يزداد معدل انتقال الحرارة مع زيادة
A Convection heat transfer coefficient
معامل نقل الحرارة بالحمل الحراري		 B Surface area of the wall
مساحة سطح الجدار
C All (A) and (B)  الكل (أ) و (ب) D Thermal conductivity of matter
الموصلية الحرارية للمادة
E none of the stated  لا شيء من المذكورين
Q 12  س 12 According to Fourier law, the Heat transfer rate increase when increase
وفقا لقانون فورييه ، يزداد معدل نقل الحرارة عند الزيادة
A Wall thickness  سمك الجدار B surface area  المساحه
C thermal resistance  المقاومة الحرارية D All of the above  كل ما سبق
E None of the above  لا شيء مما سبق
Q 13  س 13 The thermal diffusivity unit is
وحدة الانتشار الحراري هي
Q 8 The Stefan-Boltzmann law of thermal radiation is applicable for A White body B Grey body C Black body D All of the above E None of the above Q 9 ......... is the energy emitted by matter in the form of electromagnetic wave as a result of changes in electronic configurations of atoms. A Conduction B Convection C Radiation D All of the above E None of the above Q 10 Heat can be generated inside some bodies because of ___ A Passage of electric power inside it B Chemical reaction inside it cpassing of specific C electromagnetic wave though it D all of the stated E None of the above Q 11 According to Newton law of cooling, the rate of heat transfer increase with the increase of A Convection heat transfer coefficient B Surface area of the wall C All (A) and (B) D Thermal conductivity of matter E none of the stated Q 12 According to Fourier law, the Heat transfer rate increase when increase A Wall thickness B surface area C thermal resistance D All of the above E None of the above Q 13 The thermal diffusivity unit is | Q 8 | The Stefan-Boltzmann law of thermal radiation is applicable for | | | | :---: | :---: | :---: | :---: | | A | White body | B | Grey body | | C | Black body | D | All of the above | | E | None of the above | | | | Q 9 | ......... is the energy emitted by matter in the form of electromagnetic wave as a result of changes in electronic configurations of atoms. | | | | A | Conduction | B | Convection | | C | Radiation | D | All of the above | | E | None of the above | | | | Q 10 | Heat can be generated inside some bodies because of ___ | | | | A | Passage of electric power inside it | B | Chemical reaction inside it cpassing of specific | | C | electromagnetic wave though it | D | all of the stated | | E | None of the above | | | | Q 11 | According to Newton law of cooling, the rate of heat transfer increase with the increase of | | | | A | Convection heat transfer coefficient | B | Surface area of the wall | | C | All (A) and (B) | D | Thermal conductivity of matter | | E | none of the stated | | | | Q 12 | According to Fourier law, the Heat transfer rate increase when increase | | | | A | Wall thickness | B | surface area | | C | thermal resistance | D | All of the above | | E | None of the above | | | | Q 13 | The thermal diffusivity unit is | | |
A m/s  م / ث B m 2 m 2 m^(2)\mathrm{m}^{2}
C m 3 / s m 3 / s m^(3)//s\mathrm{m}^{3} / \mathrm{s} D m 2 / s m 2 / s m^(2)//s\mathrm{m}^{2} / \mathrm{s}
E s / m s / m s//m\mathrm{s} / \mathrm{m}
Q 14  س 14 qquad\qquad of the material is a measure heat.
qquad\qquad من المادة هو مقياس الحرارة.		 bility of a material to conduct
صفية مادة لإجراء
A Thermal conductivity  الموصلية الحرارية B Heat transfer coefficient
معامل نقل الحرارة
C Emissivity  الابتدائية D Specific heat  حرارة محددة
E None of the above  لا شيء مما سبق
Q 15  س 15 The materials which have low thermal conductivity are called as
تسمى المواد التي لها موصلية حرارية منخفضة باسم
A thermal conductors  الموصلات الحرارية B thermal insulators  العوازل الحرارية
C thermal resistors  المقاومات الحرارية D All of the above  كل ما سبق
E none of the above  لا شيء مما سبق
Q 16  س 16 What should be the temperature of black body to emit radiant energy which is independent of the conditions in the surroundings?
ما هي درجة حرارة الجسم الأسود لإصدار طاقة مشعة مستقلة عن الظروف المحيطة؟
A temperature of black body should be less than zero
يجب أن تكون درجة حرارة الجسم الأسود أقل من الصفر		 B temperature of black body should be more than zero
يجب أن تكون درجة حرارة الجسم الأسود أكثر من الصفر
C temperature of black body should be equal to zero
يجب أن تكون درجة حرارة الجسم الأسود تساوي صفرا		 D all of the above  كل ما سبق
E None of the above  لا شيء مما سبق
Q 17  س 17 Heat transfer through a vacuum is by ---------------- only
يتم نقل الحرارة من خلال الفراغ عن طريق ---------------- فقط
A Conduction  التوصيل B Radiation  إشعاع
C Convection  الحراري D All of the above  كل ما سبق
E None of the above  لا شيء مما سبق
Q 18  س 18 Heat transfer through conduction or convection requires
يتطلب نقل الحرارة من خلال التوصيل أو الحمل الحراري
A The presence of a material medium
وجود وسيط مادي		 B A vacuum  فراغ
C Both of A and B
كل من A و B		 D photons  الفوتونات
A m/s B m^(2) C m^(3)//s D m^(2)//s E s//m Q 14 qquad of the material is a measure heat. bility of a material to conduct A Thermal conductivity B Heat transfer coefficient C Emissivity D Specific heat E None of the above Q 15 The materials which have low thermal conductivity are called as A thermal conductors B thermal insulators C thermal resistors D All of the above E none of the above Q 16 What should be the temperature of black body to emit radiant energy which is independent of the conditions in the surroundings? A temperature of black body should be less than zero B temperature of black body should be more than zero C temperature of black body should be equal to zero D all of the above E None of the above Q 17 Heat transfer through a vacuum is by ---------------- only A Conduction B Radiation C Convection D All of the above E None of the above Q 18 Heat transfer through conduction or convection requires A The presence of a material medium B A vacuum C Both of A and B D photons| A | m/s | B | $\mathrm{m}^{2}$ | | :---: | :---: | :---: | :---: | | C | $\mathrm{m}^{3} / \mathrm{s}$ | D | $\mathrm{m}^{2} / \mathrm{s}$ | | E | $\mathrm{s} / \mathrm{m}$ | | | | Q 14 | $\qquad$ of the material is a measure heat. | | bility of a material to conduct | | A | Thermal conductivity | B | Heat transfer coefficient | | C | Emissivity | D | Specific heat | | E | None of the above | | | | Q 15 | The materials which have low thermal conductivity are called as | | | | A | thermal conductors | B | thermal insulators | | C | thermal resistors | D | All of the above | | E | none of the above | | | | Q 16 | What should be the temperature of black body to emit radiant energy which is independent of the conditions in the surroundings? | | | | A | temperature of black body should be less than zero | B | temperature of black body should be more than zero | | C | temperature of black body should be equal to zero | D | all of the above | | E | None of the above | | | | Q 17 | Heat transfer through a vacuum is by ---------------- only | | | | A | Conduction | B | Radiation | | C | Convection | D | All of the above | | E | None of the above | | | | Q 18 | Heat transfer through conduction or convection requires | | | | A | The presence of a material medium | B | A vacuum | | C | Both of A and B | D | photons |