Related Questions

When light passes from one medium to another, this phenomenon of change in its direction is called ________
A Refraction
B Diffraction
C Propagation
D No option is correct
A train running at 36 kmph passes another train completely in 12 sec , which is half of its length , running in the opposite direction at 54 kmph. Kf it also passes a railway platform in 1.5 m , what is the length of the platform (in meters)?
A 700
B 860
C 900
D 1000
A train running at 36 kmph passes another train completely in 12 sec, which is half of its length, running in the opposite direction at 54 kmph. If it also passes a railway platform in 1.5m, what is the length of the platform (in meters)?
A 700
B 860
C 900
D 1000
stand next to the lamppost and face west ,walk 20 yards and then turn 90 degrees clockwise. Walk another 10 yards and then turn 45 degrees anticlockwise. Walk another 15 yards, reverse you direction and walk 5 yards back. Turn 135 degrees clockwise and walk another 10 yards . In which direction are you now facing?
A West
B East
C South
D North
The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?
A 32%
B 40%
C 48%
D 60%
A train 150 m long passes a pole in 15 seconds and crosses another train of the same length travelling in opposite direction in 8 seconds . The speed of the second train in (km/h) is __
A 60 km /hr
B 66km /hr
C 72 km / hr
D 99 km / hr
When light passes from air into glass it experiences change of
A frequency and wavelength
B frequency and speed
C wavelength and speed
D frequency, wavelength and speed
When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
A Scattering
B Polarisation
C Absorption
D Dispersion
According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
A Motion of conductor
B Lines of force
C Either of the above
D None of the above
A train of length l, traveling at a constant velocity, passes a pole in t seconds .If the same train traveling at the same velocity passes a platform in 3t seconds, then the length of the platform is-------
A 0.5l
B l
C 1.5l
D 2l

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