Physics
Grade-10
Easy
Question
When the incandescent bulbs are seen through a turbulent stream of hot air rising above a fire, they appear to be __________.
- Twinkling
- Flickering
- Stable
- Hazy
Hint:
Space above the fire is hot and its density and hence refractive index changes frequently.
The correct answer is: Flickering
Space above the fire is hot and its density and hence refractive index changes frequently. Light coming from such places travel through a medium of changing refractive index therefore apparent image of the object also appears changing or flickering.
Related Questions to study
Physics
Which of the following is not an effect of atmospheric refraction?
Which of the following is not an effect of atmospheric refraction?
PhysicsGrade-10
Physics
The refractive index of the atmosphere is _____ related to its refractive index.
The refractive index of the atmosphere is _____ related to its refractive index.
PhysicsGrade-10
Physics
Planets can be considered as _____ sources of light.
Planets can be considered as _____ sources of light.
PhysicsGrade-10
Physics
When the incandescent bulbs are seen through a turbulent stream of hot air rising above a fire, they appear to be flickering. Why?
When the incandescent bulbs are seen through a turbulent stream of hot air rising above a fire, they appear to be flickering. Why?
PhysicsGrade-10
Physics
The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the highest refractive index.
The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the highest refractive index.
PhysicsGrade-10
Physics
Light from air at a temperature of 37 degrees Celsius enters a layer of the atmosphere at 29 degrees Celsius. The light ray ______ on entering the latter.
Light from air at a temperature of 37 degrees Celsius enters a layer of the atmosphere at 29 degrees Celsius. The light ray ______ on entering the latter.
PhysicsGrade-10
Physics
The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the lowest refractive index.
The temperatures at which the various layers of the atmosphere are present are given below in terms of degree Celsius. Identify the layer which has the lowest refractive index.
PhysicsGrade-10
Physics
When starlight enters the Earth’s atmosphere, it bends _____.
When starlight enters the Earth’s atmosphere, it bends _____.
PhysicsGrade-10
Physics
Which of the following is an effect of atmospheric refraction?
Which of the following is an effect of atmospheric refraction?
PhysicsGrade-10
Physics
Due to atmospheric refraction the duration of a normal day _____ by____ minutes.
Due to atmospheric refraction the duration of a normal day _____ by____ minutes.
PhysicsGrade-10
Physics
When we go from outer space towards the Earth, the temperature of the atmosphere ______.
When we go from outer space towards the Earth, the temperature of the atmosphere ______.
PhysicsGrade-10
Physics
The apparent sunset takes place _____ minutes _____ the actual sunset.
The apparent sunset takes place _____ minutes _____ the actual sunset.
PhysicsGrade-10
Physics
When we go from outer space towards the Earth, the refractive index of the atmosphere ______.
When we go from outer space towards the Earth, the refractive index of the atmosphere ______.
PhysicsGrade-10
Physics
The refractive index of hot air is _____ the refractive index of cool air.
The refractive index of hot air is _____ the refractive index of cool air.
PhysicsGrade-10
Physics
The apparent position of a star is slightly raised w.r.t. its actual position. This is due to _____.
The apparent position of a star is slightly raised w.r.t. its actual position. This is due to _____.
PhysicsGrade-10
