Prepare for the Class 10 Physics Chapter 11 Test 1 – Transfer of Thermal Energy with our comprehensive Full Unit Test, specially designed according to the latest Punjab Board 2027 Model Papers and the new syllabus issued by PECTAA Punjab. This chapter-wise Physics Test Series helps students strengthen their understanding of heat transfer, conduction, convection, radiation, and other important concepts through board-style examination practice. Download and practice Class 10 Physics Chapter 11 test papers to improve your conceptual understanding, revision, and exam preparation for all Punjab Boards.
PhysicsChapter-11 (Objective)Class Test-1
1. Conduction is most efficient in:
A) SolidsB) LiquidsC) GasesD) Plasma
Answer: A) Solids
2. Land breeze blows from:
a) Sea to landb) Land to seac) Ocean to skyd) Sky to land
Answer: b) Land to sea
3. Heat from the Sun reaches the Earth mainly through:
a) Conductionb) Convectionc) Radiationd) Evaporation
Answer: c) Radiation
4. Which surface is the best emitter of heat in Leslie’s cube?
a) Shiny silverb) White surfacec) Dull black surfaced) Coloured surface
Answer: c) Dull black surface
5. Global warming can affect:
a) Only plantsb) Only oceansc) Global climate patternsd) Only animals
Answer: c) Global climate patterns
6. Which method of heat transfer requires direct contact between particles?
(a) Convection(b) Radiation(c) Conduction(d) Evaporation
Answer: (c) Conduction
7. The surface which absorbs and emits the most radiation is:
(a) smooth and shiny surfaces(b) dark and rough surfaces(c) transparent and thin surfaces(d) polished and white surfaces
Answer: (b) dark and rough surfaces
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PhysicsChapter-11 (Subjective)Class Test-1
Attempt any 7 Questions.7 × 2 = 14
1. What is conduction?
Ans: Conduction is the transfer of heat through a substance from particle to particle without the movement of the substance itself, mainly in solids.
2. How do convection currents use to warm homes and offices?
Ans: A heater warms the air near it. The warm air becomes lighter and rises, cooler air sinks to take its place, and this circulation warms the whole room.
3. Why does a land breeze occur at night?
Ans: At night land cools faster than the sea. Warm air over the sea rises and cooler air from the land moves toward the sea to replace it.
4. Why does a cold glass of water warm up?
Ans: Heat flows from the warmer surroundings to the colder water until both reach the same temperature.
5. What is the greenhouse effect?
Ans: Greenhouse gases trap part of the heat radiated by the Earth, keeping the atmosphere warm.
6. Why does the handle of a cooking pan stay cool?
Ans: The handle is made of an insulator such as plastic or wood, which is a poor conductor of heat.
7. What are the three primary types of heat transfer?
Ans: Conduction, convection and radiation.
8. What natural phenomenon causes land and sea breezes?
Ans: Convection currents caused by the unequal heating and cooling of land and sea.
9. What is radiation, and how does it transfer heat?
Ans: Radiation is heat transfer by electromagnetic (infrared) waves. It needs no medium and can travel through a vacuum.
10. How do birds like eagles and gliders manage to stay aloft without flapping their wings for hours?
Ans: They ride rising warm air currents (thermals), which lift them upward.
SECTION-II (5+4)
1. Describe how convection occurs in fluids. How do convection currents contribute to natural phenomena such as sea breezes and wind patterns?
Ans: When a fluid is heated it expands, becomes less dense and rises; cooler, denser fluid sinks and takes its place, forming a convection current. Unequal heating of land and sea creates sea and land breezes, and uneven heating of the Earth creates wind patterns.
2. Compare the absorption and emission of heat by different surfaces. How does the colour and texture of a surface affect its ability to absorb and emit heat?
Ans: Dull black and rough surfaces are the best absorbers and best emitters of heat radiation. Shiny, white and polished surfaces are poor absorbers and poor emitters, because they reflect most of the radiation.
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