Bats navigate and find food by
(a) Eco-sounding
(b) Eco-location
(c) Acoustical echo
(d) None of these
Basic Concepts of Physics
When the source is moving towards the observer at rest the apparent frequency will
(a) Increased
(b) Decreased
(c) Both of above
(d) None of these
If the stars are moving away from the Earth show a
(a) Red shift
(b) Blue shift
(c) Green shift
(d) None of these
If the stars are moving towards the earth show a
(a) Red shift
(b) Blue shift
(c) Yellow shift
(d) None of these
Doppler affect can be used to calculate the speeds of
(a) Planets
(b) Distant stars
(c) Galaxies
(d) All of these
The military applications of Doppler’s effect are
(a) Location of submarines
(b) Control of anti submarine weapons
(c) Depth measurement of sea
(d) All of these
Sonar is the name of technique or detecting the presence of objects under water by
(a) Eco-ranging
(b) Eco-sounding
(c) Eco-acoustical
(d) All of these
In Hook’s law, K is the spring constant depending on the
(a) Dimensions of spring
(b) Material of spring
(c) Applied force
(d) All of these
Restoring force is the
(a) Opposing force
(b) Frictional force
(c) Elastic force
(d) All of these
The energy of characteristic X-rays depends upon the
(a) Voltage applied
(b) Type of target
(c) Temperature
(d) None of these