When a beam of light is passed through a transparent medium, however, clear or homogeneous the medium may be, there is always a certain amount of light scattered sideways, out of the beam. This is known as _____.

1. 1. Raman effect
   2. Dispersion
   3. Rayleigh scattering
   4. None of the above

A polaroid is_____,

1. 1. A red light filter
   2. A devices used for analyzing polarized light
   3. A device used in polarimeter
   4. An adjustable shutter

Which of the following colour of light travel through, glass with minimum _____.

1. 1. Greed
   2. Red
   3. Yellow
   4. Violet

which of the following gives correct descending order of elasticity in the substances?

1. 1. Rubber, Silver, glass
   2. Steel, silver, rubber
   3. Silver, rubber, steel
   4. All have equal elasticity

On passing through food stuff, X-ray can kill the _____.

1. 1. Insects
   2. Virus
   3. Bacterials
   4. Fungus

Soldiers crossing a suspension bridge, always break steps, incase the frequency of vibration of their marching should coincide with that of the bridge and this is because of the phenomenon of:

1. 1. Resonance of sound
   2. Refraction of sound
   3. Echolocation of sound
   4. Reverberation of sound

Sound travels faster in _____.

1. 1. Dry air than in water
   2. Hydrogen than in water
   3. Iron than in air
   4. Wood than in iron

Electromagnetic waves travel with the _____.

1. 1. Speed of light
   2. Speed of earth rotation
   3. Speed of sun rotation
   4. Speed of sound

When light enters from rare to denser medium, it bends towards the normal line, it is called _____.

1. 1. Absorption of light
   2. Refraction of light
   3. Diffraction of light
   4. Reflection light

Argon laser is used for operating the _____.

1. 1. Kidney stone
   2. Eye cance3r
   3. Bone disease
   4. Glaucoma