Sound waves cannot be polarised because they
(a) have low velocity
(b) are tranverse
(c) require a material medium for propagation
(d) are longitudinal
Answer:
Pitch is sensation which depends upon
(a) wavelength
(b) velocity
(c) frequency
(d) amplitude
Answer:
X-rays absorption will be maximum for the sheets of
(a) Iron
(b) Copper
(c) Silver
(d) Lead
Answer:
Structure of solids is investigated by using
(a) X-rays
(b) Y-rays
(c) Infrafed radiation
(d) Cosmic rays
Answer:
X-rays are steams of
(a) Protons
(b) Electrons
(c) Photons
(d) None
Answer:
Decibel is the unit used for measuring
(a) Intensity of heat
(b) Radiowave frequency
(c) Intensity of sound
(d) Speed of light
Answer:
The image of our face in a plane mirror
(a) Diminished
(b) Real
(c) Magnified
(d) None of these
Answer:
Blue colour of the sky is consequence of
(a) Scattering
(b) Reflection
(c) Dispersion
(d) Refraction
Answer:
When viewed in white light, soap bubbles show colours because of
(a) Dispersion
(b) Diffraction
(c) Interference
(d) Scattering
Answer:
Longitudinal waves do not exhibit
(a) Diffraction
(b) Refraction
(c) Polarization
(d) Reflection
Answer: