Convection Types MCQ (Multiple Choice Questions) PDF - 90

MCQ 446: Convection currents do not occur in

1. solids
2. liquids and gases
3. gases
4. liquids

MCQ 447: If an object is released from rest from an unknown height and the acceleration due to free fall is 10 ms^-2, then the speed of the object just before it hits the ground would be

1. 20 ms^-1
2. 50 ms^-1
3. 25 ms^-1
4. 100 ms^-1

MCQ 448: The refractive index is the ration between the speed of light in air or vacuum and

1. a speed of sound in a medium
2. a speed of light in a medium
3. can be A or B
4. none of the above

MCQ 449: Latent heat means

1. no heat
2. fiscal heat
3. visible heat
4. hidden heat

MCQ 450: When there is more exposed surface area of the liquid, the rate of evaporation

1. becomes zero
2. becomes negative
3. decreases
4. increases