Physics - Study Mode

[#371] Hot springs are heated geothermally by underlying
Correct Answer

(B) Magma

Explanation

Solution: Magma is molten rocks beneath the earth's crust. Hot springs are heated geothermally by underlying magma.

[#372] Which of the following is the cleanest source of energy?
Correct Answer

(D) Wind energy

Explanation

Solution: Wind energy is the cleanest source of energy.

[#373] The Solar energy produced by
Correct Answer

(A) Fusion reaction

Explanation

Solution: Solar energy is any type of energy generated by the sun. Solar energy is created by nuclear fusion that takes place in the sun. Fusion occurs when protons of hydrogen atoms violently collide in the sun's core and fuse to create a helium atom.

[#374] The oldest type of energy known to man is
Correct Answer

(D) Geothermal energy

Explanation

Solution: Geothermal energy is heat energy generated and stored in the Earth. Geothermal energy has been used for thousands of years in some countries for cooking and heating.

[#375] The energy emitted by the Sun is due to
Correct Answer

(C) Nuclear fusion

Explanation

Solution: The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom.