Grade 10th

1. Which is an example of longitudinal wave?

• sound waves

• light wave

• radio wave

• water wave

1. 1 bel=…

• 10dB

• 7dB

• 8dB

• 9dB

If the image is virtual,then its distance from lens is taken

• positive

• negative

• double

• half

The line joining centre of curvature and pole of spherical mirror is called:

• vertix

• principle axis

• radius of cervature

• center of cervature

1. Who describe light travel as wave pattern.

• Golstine

• newton

• maxwel

• Thomas young

1. when light traveling in a certain medium falls on the surface of another medium, a part of it turn back in the same medium.this is know as Of light.

• reflection

• refraction

• differaction

• interfarence

1. Distance between two consecutive compression and rarefaction is called….. of sound.

• wavelength

• crest

• trough

• amplitude

1. In the case of convex mirror the image formed is:

• real

• virtual

• erected

• d) both b and c

1. Which characteristics of sound can a loud and a faint sound be distinguished?

• loudness

• intensity

• pitch

• quality

1. In a vacuum ,all electromagnetic waves have the same:

• wavelength

• speed

• amplitude

• frequency