The behaviour of water waves can be studied in
Deep water
Shallow water
Ripple tank
Sea water
A disturbance which carries energy from one place to another without transferring matter is called
A transverse wave
A longitudinal wave
A progressive wave
Water wave
Waves travel more slowly in
Ocean
River water
In the electromagnetic spectrum which waves have the longest wave length?
Microwaves
Light wave
Radio waves
X -rays
All types of electromagnetic radiations travel through vacuum at
3 × 108 m/s
3 × 108 km/s
3 × 10-8 m/s
3 × 10-8 km/s
A bigger crest is formed at the point where two smaller crests from two different sources meet simultaneously is called
Waves in phase
Waves out of phase
Interference
Polarisation
Which technique is used by bats to judge how far an object is?
Ultrasonic echo technique
X- ray technique
Infrasonic echo technique
Ultraviolet radiation technique
The spreading of wave at the edges or obstacle is called
Reflection
Refraction
Diffraction
Light of one colour and so of one wavelength is called
Infrared radiation
Ultraviolet radiation
Monochromatic light
X-rays
The phenomenon in which electrons are ejected from metal surfaces when electromagnetic waves fall on them is called
Photoelectric effect
Magnetism
Spectrum
