MCQs

Explanation
In  geology, the crust is the outermost solid shell of a rocky planet, dwarf planet, or natural satellite.

Explanation
Learning by doing  refers to a theory of  education  expounded by American  philosopher  John Dewey.

Explanation
Lake Tana is the largest l ake in Ethiopia , It is the main source of the Blue Nile The lake is approximately 84 kilometres (52 miles) long and 66 kilometres (41 miles) wide,

Explanation
The triangular prism is one of the most commonly used dispersive prisms , particularly in spectroscopy and optical instruments. It is called a dispersive prism because it separates light into its different colors (spectrum) due to the different refractive indices of the glass for different wavelengths.

Explanation
Binoculars typically use Porro prisms , which are a type of reflecting prism that uses total internal reflection to redirect light. Porro prisms are named after their inventor, Ignazio Porro, and are widely used in binoculars and other optical instruments.

Explanation
Binoculars use a combination of lenses and prisms to magnify and redirect light, relying on total internal reflection to ensure minimal light loss and a bright, clear image.

Explanation
Reflecting prisms work on the principle of total internal reflection , where light is completely reflected back into the prism material rather than passing through the interface.

Explanation
Total internal reflection occurs when light travels from a denser medium (like water) to a rarer medium (like air) and the angle of incidence is greater than the critical angle.

Explanation
Thermal energy can be transferred through all three methods: Conduction : Direct transfer between particles in physical contact. Convection : Transfer through the movement of fluids. Radiation : Transfer through electromagnetic waves (e.g., light, radio waves).

Explanation
Refrigerators work on the principle of heat transfer through conduction, convection, and radiation. They use a combination of these methods to transfer heat from the inside to the outside, keeping your food and drinks cool and fresh.

Explanation
During nighttime, the air above the land loses heat and cools down , causing its density to increase. This is because cool air contracts and becomes denser than warm air.

Explanation
Convection is the primary mode of heat transfer in liquids and gases , where heat is transferred through the motion of fluids. This motion creates circulation currents that carry heat energy from one location to another.

Explanation
Convection is the mode of heat transfer that occurs when a fluid (such as a gas or liquid) moves and carries heat energy from one location to another. This transfer of heat occurs due to the bulk motion of the fluid.

Explanation
The triangular prism is one of the most commonly used dispersive prisms , particularly in spectroscopy and optical instruments. It is called a dispersive prism because it separates light into its different colors (spectrum) due to the different refractive indices of the glass for different wavelengths.

Explanation
Binoculars typically use Porro prisms , which are a type of reflecting prism that uses total internal reflection to redirect light. Porro prisms are named after their inventor, Ignazio Porro, and are widely used in binoculars and other optical instruments.

Explanation
Binoculars use a combination of lenses and prisms to magnify and redirect light, relying on total internal reflection to ensure minimal light loss and a bright, clear image.

Explanation
Reflecting prisms work on the principle of total internal reflection , where light is completely reflected back into the prism material rather than passing through the interface.

Explanation
Total internal reflection occurs when light travels from a denser medium (like water) to a rarer medium (like air) and the angle of incidence is greater than the critical angle.

Explanation
Thermal energy can be transferred through all three methods: Conduction : Direct transfer between particles in physical contact. Convection : Transfer through the movement of fluids. Radiation : Transfer through electromagnetic waves (e.g., light, radio waves).

Explanation
Refrigerators work on the principle of heat transfer through conduction, convection, and radiation. They use a combination of these methods to transfer heat from the inside to the outside, keeping your food and drinks cool and fresh.

Explanation
During nighttime, the air above the land loses heat and cools down , causing its density to increase. This is because cool air contracts and becomes denser than warm air.

Explanation
Convection is the primary mode of heat transfer in liquids and gases , where heat is transferred through the motion of fluids. This motion creates circulation currents that carry heat energy from one location to another.

Explanation
Convection is the mode of heat transfer that occurs when a fluid (such as a gas or liquid) moves and carries heat energy from one location to another. This transfer of heat occurs due to the bulk motion of the fluid.

Explanation
The triangular prism is one of the most commonly used dispersive prisms , particularly in spectroscopy and optical instruments. It is called a dispersive prism because it separates light into its different colors (spectrum) due to the different refractive indices of the glass for different wavelengths.

Explanation
Binoculars typically use Porro prisms , which are a type of reflecting prism that uses total internal reflection to redirect light. Porro prisms are named after their inventor, Ignazio Porro, and are widely used in binoculars and other optical instruments.

Explanation
Binoculars use a combination of lenses and prisms to magnify and redirect light, relying on total internal reflection to ensure minimal light loss and a bright, clear image.

Explanation
Reflecting prisms work on the principle of total internal reflection , where light is completely reflected back into the prism material rather than passing through the interface.

Explanation
Total internal reflection occurs when light travels from a denser medium (like water) to a rarer medium (like air) and the angle of incidence is greater than the critical angle.