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11. One liter of water at 300 c is mixed with one liter of water at 500 C. The temperature of the mixture will be __________.
A. 800 C
B. More than 500 C but less than 800 C
C. 200 C
D. Between 300 C and 500 C
ANSWER:D
SOLUTION :A reliable measure of the hotness of an object is its temperature. Temperature is measured by a device called thermometer.
12. Convection may occur through ________.
A. Solid and Liquids
B. Liquids and Gases
C. Solids and Gases
D. Solid Liquid and Gases
ANSWER:B
SOLUTION:Convection can only take place through fluids i.e. liquids and gases. Solids cannot transfer heat through convection.
13. In vacuum, the heat is transferred by the process of ________.
A. Convection
B. Radiation
C. Conduction
D. Insulation
ANSWER:B
SOLUTION:In a vacuum, heat is transferred by radiation, which is the process of transferring heat energy through space using electromagnetic radiation. Radiation occurs without the need for particles, so it can work through the vacuum of space.
14. A plastic spoon is dipped in a cup of Ice cream, Its other end _________.
A. Becomes cold by Conduction
B. Becomes cold by Convection
C. Becomes cold by Radiation
D. Does not become cold
ANSWER:A
SOLUTION:A plastic spoon is a poor heat conductor, thus it will not become cold, on dipping in an ice cream cup.
15. A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because ______.
A. Friction between the layers of newspaper produces heat.
B. Air trapped between the layers of newspaper is a bad conductor of heat.
C. Newspaper is a conductor of heat.
D. Newspaper is at a higher temperature than the temperature of the surroundings.
ANSWER:B
SOLUTION:Air trapped between the layers of newspaper is a bad conductor of heat.
16. Shining thread in thermometer is the column of _________.
A. Mercury
B. Water
C. Xenon
D. Silver dye
ANSWER:A
SOLUTION :shining thread of mercury can be seen
17. The maximum and minimum temperature of the day is measured by a _________.
A. Clinical Thermometer
B. Laboratory Thermometer
C. Maximum – Minimum Thermometer
D. All of the above
ANSWER:C
SOLUTION:A Max-Min thermometer is used to measure the maximum and minimum temperatures of the day.
18. In ________generally, the heat is transferred by the process of conduction.
A. Liquids
B. Solids
C. Gases
D. Wood
ANSWER:B
SOLUTION: Heat is transferred by conduction in solids. Conduction is the process of transferring heat energy without moving the particles inside a solid.
19. In coastal areas, cold air flows in the day from sea to land. It is called ________.
A. Land Breeze
B. Cold Breeze
C. Sea Breeze
D. Hot Breeze
ANSWER:C
SOLUTION: The air pressure over the water is higher with colder dense air, which moves to occupy the space created over the land. The cooler air that comes along is called a sea breeze.
20. To determine which object is hottest the most reliable measurement is ________.
A. By touch
B. By colour
C. By thermometer
D. By licking
ANSWER:C
SOLUTION:Temperature is a reliable measure of an object’s hotness. A thermometer is a device used to measure temperature.