10 cm in front of the mirror
5 cm in front of the mirror
10 cm behind the mirror
5 cm behind the mirror
Correct answer is C
u = 5 cm , f = 10 cm, v = ?
(1)/v + (1)/u = (1)/f
(1)/v + (1)/5 = (1)/10
= (1)/v = (1)/10 - (1)/5
= (1 - 2)/10 = (1)/10
∴ v = - 10 cm
∴ The image is 10 cm behind the mirror
I. Moon.
II. Sun.
III.street light.
IV. stars.
Which of these are natural sources of light?
II, III, and IV only
I, II and III only
III and IV only
II and IV only
Correct answer is D
The sun and stars are self luminous object.
quality
pitch
intensity
loudness
Correct answer is A
The quality of a note is a characteristic that distinguishes it from note of the same frequency played by another musical instrument.
A man standing 2 m from a charcoal fire is warmed mainly by?
convection
radiation
refraction
conduction
Correct answer is B
Radiation is the method of heat transfer with or without a material medium. It can be through space or through a material medium.
It is observed that water will wet a clean glass because the?
cohesion of water to glass is stronger than the cohesion of water molecules
adhesion of water molecules is weaker than the cohesion of water to glass
cohesion of water to glass is weaker than the cohesion of water molecules
adhesion of water molecules is stronger than the cohesion of water molecules
Correct answer is D
When the adhesion of liquid molecules to the glass is more than the cohesion of the liquid, the liquid will wet glass.