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1. A reliable measure of the ________ of an object is its temperature.
A. Hotness
B. Coldness
C. Both a & b
D. None of the above
ANSWER:A
SOLUTION :A reliable measure of the hotness of an object is its temperature. Temperature is measured by a device called thermometer.
2. The temperature of an object increases because of the ______ of heat.
A. Reflection
B. Transmission
C. Absorption
D. Conduction
ANSWER:C
SOLUTION:An object’s temperature increases because of the absorption of heat. Heat is the transfer of energy, and temperature is the average kinetic energy of particles in a system.
3. Light colored clothes ________most of the heat that falls on them.
A. Absorb
B. Reflects
C. Transmits
D. Radiate
ANSWER:B
SOLUTION:Light-colored clothes reflect most of the heat that falls on them, making them more comfortable to wear in summer.
4. In solids, generally, the heat is transferred by the process of ________.
A. Convection
B. Radiation
C. Conduction
D. Insulation
ANSWER:C
SOLUTION:Conduction is the transfer of heat energy without the movement of particles inside the solid. It occurs when neighboring atoms or molecules collide, and it happens more easily in solids and liquids because their particles are closer together than in gases.
5. What is the normal temperature of a healthy person?
A. 37 F
B. 370 C
C. 37 K
D. Both a and b
ANSWER:B
SOLUTION:Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as 98.6°F (37°C).
6. Heat always flows ________.
A. From colder to hotter object
B. From hotter to colder object
C. In both direction
D. Heat never flows from one object to other
ANSWER:B
SOLUTION :Heat always flows from a warmer object to a cooler object until they reach the same temperature.
7. Heat from the sun reaches to earth by _______,
A. Convection
B. Radiation
C. Conduction
D. Insulation
ANSWER:B
SOLUTION:Heat from the sun reaches Earth by radiation, a process that doesn’t require a medium and can occur in a vacuum. This is why we can feel the sun’s heat even though there are 150 million kilometers of vacuum between the sun and Earth.
8. A metal surface feels cold as compared to a wooden surface on a winter morning , because the metal surface __________,
A. Is a better conductor of heat than the wooden surface.
B. Is polished while wooden surface is not polished.
C. Reflects more heat than wooden surface
D. Both a and B
ANSWER:A
SOLUTION: A metal surface feels colder than a wooden surface on a winter morning because metal is a better conductor of heat than wood.
9. The thermometer used to measure human body temperature is called _________ thermometer.
A. Mercury
B. Clinical
C. Laboratory
D. Absolute
ANSWER:B
SOLUTION: The thermometer used to measure human body temperature is called a clinical thermometer or medical thermometer.
10. All hot bodies radiate ________,
A. Temperature
B. Water
C. Heat
D. Electricity
ANSWER:C
SOLUTION:All hot bodies radiate heat. This process of heat transfer is called radiation and it doesn’t require a material medium, like a vacuum.