CBSE Class 7 Science Heat Transfer in Nature (Class 7 NCERT New) Quiz 4

1. What type of heat transfer does not require a medium (matter) to travel through?

A Conduction B Convection C Radiation D Diffusion

2. In convection, heat is transferred through the movement of:

A Solid particles vibrating in place B Electromagnetic waves C Fluids such as liquids and gases D Sound waves

3. What is the primary source of radiant energy that drives heat transfer on Earth?

A The Moon B Volcanoes C The Sun D Ocean currents

4. Which term describes an organism that relies on external heat sources to regulate its body temperature?

A Endotherm B Ectotherm C Homeotherm D Mesotherm

5. What happens to warm air in the atmosphere due to convection?

A It sinks toward the ground B It stays at the same level C It rises upward D It moves horizontally only

6. Which of the following materials found in nature is the poorest conductor of heat?

A Granite rock B Wet clay C Still air D Seawater

7. In which direction does heat naturally flow between two objects?

A From the cooler object to the warmer object B From the warmer object to the cooler object C In both directions equally D Heat does not flow between objects

8. Which layer of a penguin's body primarily acts as thermal insulation against cold temperatures?

A Skin B Feathers and blubber C Bones D Muscles

9. A student observes that a lizard basks on a warm rock in the morning but moves to the shade during the hottest part of the day. Using your knowledge of heat transfer and ectotherms, which of the following best explains this behavior and the heat transfer processes involved?

A The lizard uses conduction from the rock in the morning to gain heat, and moves to shade to avoid excessive radiation from the Sun, maintaining a safe body temperature B The lizard uses convection from the rock in the morning to gain heat, and moves to shade to avoid conduction from the ground C The lizard moves to the rock to cool down through radiation and moves to shade to gain heat through convection D The lizard absorbs heat through radiation in the morning and moves to shade to increase its body temperature further through conduction

10. Ocean currents play a major role in distributing heat across Earth's ecosystems. Which combination of heat transfer processes best explains how the Sun's energy warms the ocean surface and then gets distributed to different regions?

A Conduction from the Sun warms the ocean, and then radiation distributes the heat to other regions B Radiation from the Sun warms the ocean surface, and then convection currents distribute the heat to different regions C Convection from the Sun warms the ocean, and then conduction distributes the heat to other regions D Radiation from the Sun warms the ocean, and then conduction through the water distributes the heat equally