Rate of Infrared Radiations Notes Questions with Answers PDF Download - 79

Surface that would better absorb the infrared radiations is

1. Dull and white
2. Shiny and white
3. Dull and black
4. Shiny and black

Given that the normal reaction is constant, the friction force is

1. directly proportional to the area of the contact of the given surfaces
2. inversely proportional to the area of the contact of the given surfaces
3. directly proportional to the square of the area of the contact of the given surfaces
4. independent of the area of the contact of the given surfaces

A car stopped screeching to avoid the crash with a van, change is involved in the process is

1. Kinetic energy is converted into sound energy
2. Kinetic Energy is converted into sound and thermal energy
3. Potential energy is converted into sound, heat and kinetic energy
4. Kinetic and potential energy is converted into thermal and sound energy

Formula for Kinetic energy is

1. 1/2mv²
2. 1/2m²v
3. mv²
4. mv^-2

Type of force that opposes motion in fluids (water and air) is termed as

1. resistance
2. Tension
3. Weight
4. Friction