Every hot object emits ______
Infrared rays
All hot objects emit infrared radiation (option 3) as part of thermal radiation. The wavelength and intensity depend on temperature - hotter objects may also emit visible light (like red-hot metal), but infrared emission occurs at all temperatures above absolute zero. This principle is used in thermal imaging and night vision technology to detect heat signatures.
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Which of the following is indicated by the colour of a star?
For which one of the following, 'Diodes' are generally used for?
An anemometer measures which of the following?
Which term is not associated with sound wave?
If an electron and a photon have the same wavelength, then they will have the same
'Parsec' is the unit measurement of
Atomic explosion is triggered by which kind of reaction?
The phenomenon of change in direction of light when it passes from one medium to another is called
Ozone protects biosphere from ______
The equation F = k(q1×q2)/r² is representation of:
(Where F is the attractive or repulsive electric force of two point charges q1 and q2 and r is the distance between two charges)
Important Questions from Physics
What is the colour of the light emitted by the Sun?
Lightning occur in the sky when two clouds:
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
Which one of the following is a reason why astronomical distances are measured in light-years?
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
Select the correct answer using the code given below.
