CSS MCQs

Pitch rises as vibration frequency increases.
Low frequencies produce lower-pitched sounds.

Space between the Sun and Earth is nearly a vacuum.
Solar energy reaches Earth as electromagnetic radiation.

Visible light is part of the electromagnetic spectrum.
It can travel through a vacuum.

Greater wave amplitude carries more energy.
It is generally perceived as a louder sound.

Wood and many plastics conduct heat poorly.
They reduce heat transfer to the user's hand.

Non-luminous objects become visible when illuminated.
Reflected light enters the eyes and forms an image.

Sound waves can reflect from distant surfaces.
If the delay is sufficient, the reflected sound is heard as an echo.

Metals transfer heat efficiently from the flame to food.
This makes cooking faster and more even.

Reflection from a smooth surface obeys equal incidence and reflection angles.
Both angles are measured from the normal.

Soft porous materials absorb part of the sound energy.
This reduces excessive reverberation and improves clarity.

Conduction transfers thermal energy through particle interactions.
It is especially important in solids.

Convection occurs when warmer fluid moves and cooler fluid replaces it.
It happens in liquids and gases.