Which of the following type of waves is used in the SONAR device?

Phenomenon of sound which is applied in SONAR?

Which of these sound waves are produced by bats and dolphins?

' സബ്സോണിക് ' എന്നറിയപ്പെടുന്ന ശബ്ദതരംഗം ഏത് ?

The frequency range of audible sound is__________

Name the sound producing organ of human being?

Persistence of sound as a result of multiple reflection is

The solid medium in which speed of sound is greater ?

Study of sound is called

What is the effect of increase of temperature on the speed of sound?

Nature of sound wave is :

In which medium sound travels faster ?

In which of the following the sound cannot travel?

ഒരു വസ്തുവിനെ ഭൂമിയുടെ ധ്രുവപ്രദേശത്തു നിന്നും ഭൂമദ്ധ്യരേഖാ പ്രദേശത്തേക്ക് കൊണ്ടുപോകുമ്പോൾ അതിന്റെ പിണ്ഡവും ഭാരവുമായി ബന്ധപ്പെട്ട ശരിയായ പ്രസ്താവന തിരഞ്ഞെടുക്കുക.

ഒരു കോൺകേവ് ദർപ്പണത്തിന്റെ പോളിൽ നിന്നും മുഖ്യഫോക്കസിലേക്കുള്ള ദൂരം12 cm ആണെങ്കിൽ അതിന്റെ വക്രത ആരം എത്ര ?

ദ്രവ്യത്തിന്റെ ഒമ്പതാമത്തെ അവസ്ഥ ഏത് ?

വീർപ്പിച്ച ഒരു ബലൂൺ വെള്ളത്തിന് അടിയിലേക്ക് താഴ്ത്തുമ്പോൾ അതിന്റെ വലുപ്പം കുറയുന്നു. ഇത് താഴെ തന്നിരിക്കുന്ന ഏത് നിയമവുമായി ബന്ധപ്പെട്ടിരിക്കുന്നു ?

What type of lens is a Magnifying Glass?

What type lens is used to correct hypermetropia ?

Mirrors _____ light rays to make an image.

What kind of lens is used by short-sighted persons?

What kind of image is created by a concave lens?

The head mirror used by E.N.T doctors is -

CD reflecting rainbow colours is due to a phenomenon called

The different colours in soap bubbles is due to

National Science Day

The phenomenon of scattering of light by the colloidal particles is known as

2021 അന്താരാഷ്ട്ര ബഹിരാകാശ വാരാഘോഷത്തിൻ്റെ വിഷയം എന്താണ് ?

The principal of three primary colours was proposed by

Father of long distance radio transmission

X rays were discovered by

Which among the following is having more wavelengths?

Which of the following is called heat radiation?

Which of the following electromagnetic waves is used to destroy cancer cells?

Which type of light waves/rays used in remote control and night vision camera ?

TV remote control uses

Which of the following electromagnetic waves has the highest frequency?

Light with longest wave length in visible spectrum is _____?

Which radiation has the highest penetrating power?

Which one among the following types of radiations has the smallest wave length?

Which of the following rays has maximum frequency?

Which one is correct?

Light wave is a good example of

What does LASER stand for?

A sound wave is an example of a _____ wave.

In a longitudinal wave, the motion of the particles is _____ the wave's direction of propagation.

In a transverse wave, the motion of the particles is _____ the wave's direction of propagation.

Which type of mirror is used in rear view mirrors of vehicles?

What type of energy transformation takes place in dynamo ?

Microphone is used to convert