The carbon filament is invented by
The blue colour of sky is due to the phenomenon of
If the doors of a refrigerator are left open for a few hours, the room temperature will____?
Where should an object be placed so that a real and inverted image of the same size is obtained using a convex lens?
The bases of cooking vessels are painted ___ in order to absorb more heat.
Photoelectric effect was discovered by
Which instrument measures the intensity of earthquake shocks?
Decibel is used to measure______?
The molecular weight of water is___?
When X-rays are produced?
Temperature of the substance denotes ____ energy of its particles.