Color blindness is the decreased ability to see color or differences in color. The most common form of colour blindness is known as red/green colour blindness and most colour blind people suffer from this. Those affected have difficulty with discriminating red and green hues due to the absence or mutation of the red or green retinal photoreceptors.

Correct Option: B

Color blindness is the decreased ability to see color or differences in color. The most common form of colour blindness is known as red/green colour blindness and most colour blind people suffer from this. Those affected have difficulty with discriminating red and green hues due to the absence or mutation of the red or green retinal photoreceptors.

The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.

Correct Option: D

The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.

Recoil is the backward momentum of a gun when it is discharged. In technical terms, the recoil caused by the gun exactly balances the forward momentum of the projectile and exhaust gases (ejecta), According to Newton's third law. In case of canons, the momentum is transferred to the ground through its mount.

Correct Option: C

Recoil is the backward momentum of a gun when it is discharged. In technical terms, the recoil caused by the gun exactly balances the forward momentum of the projectile and exhaust gases (ejecta), According to Newton's third law. In case of canons, the momentum is transferred to the ground through its mount.

The timbre or quality of a sound depends on its wave form, which varies with the number of overtones, or harmonics, that are present, their frequencies, and their relative intensities. In simple terms, timbre is what makes a particular musical sound have a different sound from another, even when they have the same pitch and loudness.

Correct Option: D

The timbre or quality of a sound depends on its wave form, which varies with the number of overtones, or harmonics, that are present, their frequencies, and their relative intensities. In simple terms, timbre is what makes a particular musical sound have a different sound from another, even when they have the same pitch and loudness.

When a particle is thrown vertically upwards in space, it will experience constant acceleration towards the ground (irrespective of the direction in which it is moving in), known as acceleration due to gravity. At the highest point, it has zero velocity but has downward acceleration equal to acceleration due to gravity.

Correct Option: A

When a particle is thrown vertically upwards in space, it will experience constant acceleration towards the ground (irrespective of the direction in which it is moving in), known as acceleration due to gravity. At the highest point, it has zero velocity but has downward acceleration equal to acceleration due to gravity.