NCERT Notes for Class 8 | NCERT Quiz | NCERT Standard 8 - Science

Questions are based on Chapter 4 : Heat
1. In coastal areas, sea breeze happens during day time
A. True
B. False

2. We use clinical thermometer to measure the temperature of human body. Before using it, we need to ensure that the mercury level is below ?
A. 40 Degree celsius
B. 38 Degree celsius
C. 35 Degree celsius
D. 33 Degree celsius

3.Stainless steel pans are usually provided with copper bottoms. The  reason for this could be that?
A. Copper bottom makes the pan more durable
B. Such pans appear colourful
C. Copper is a better conductor of heat than the stainless steel.
D. Copper is easier to clean than the stainless steel.

4.A wooden spoon is dipped in a cup of ice cream. Its other end
A. becomes cold by the process of conduction.
B. becomes cold by the process of convection.
C. becomes cold by the process of radiation.
D. does not become cold.

5. An iron ball at 40°C is dropped in a mug containing water at 40°C.  The heat will
A. flow from iron ball to water.
B. not flow from iron ball to water or from water to iron ball.
C. flow from water to iron ball.
D. increase the temperature of both

6. In places of hot climate it is advised that the outer walls of houses be  painted white because
A. White color absorb heat from sun
B. White color reflect heat from sun
C. White colored paints are bad conductors of heat
D. whilte color is more beautiful

More about Answers
1. A sea-breeze (or onshore breeze) is a wind from the sea that develops over land near coasts during day time. It is formed by increasing temperature differences between the land and water which create a pressure minimum over the land due to its relative warmth and forces higher pressure, cooler air from the sea to move inland. During night, land gets cooler than sea and land breeze happens.