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Important Points to remember:
- Deforming forces are external force applied on a body to change its size or shape.
- Restoring force is the internal force developed in a body trying to bring it back to the original configuration when it is acted upon by an external force trying to change its size or shape.
- Elasticity is the property of a body by virtue of which it tries to regain its original configuration when the deforming forces are removed.
- Perfectly elastic body is a body which regains its original configuration completely on removal of deforming forces.
- Plasticity is the property of a body by virtue of which it does not regain its original configuration on removal of deforming forces.
- Perfectly plastic body is a body which does not show any tendency to regain its original configuration on removal of deforming forces
- Stress: The restoring force developed per unit area of a deformed body is called stress.
- Tensile stress: If a deforming force is trying to produce an increase in length, then the restoring force developed per unit area of cross section is called tensile stress
- Compressive Stress: When a deforming force acting normal to a surface tries to produce a change in volume, then the restoring force produced per unit area is called compressive stress.
- Shearing stress: When a tangential force tries to change the shape of a body whose bottom is fixed, then the restoring force developed per unit area is called Shearing stress.
- Strain: The ratio of the change in dimension to the original dimension of a deformed body is called strain
- Linear or longitudinal strain
Download a good collection of questions from Class 8 Science NCERT Textbook. The collection includes questions requiring Higher order thinking skills (HOTS
Find below some of the fill in the blanks questions from the chapter sound. (Class 9 Science) Practisinf fill in the blanks typwe questions helps better comprehension and thorough reading of the text book. As a follow up you can try making more fill in the blanks type questions yourself from the textbook.
- ______ is a form of energy which produces a sensation of hearing to our ears.
- λ is a symbol of representing _____________.
- __________ is the reciprocal of frequency.
- Mechanical waves are of two types; _____________ and ______________.
- Sound waves travel in the form of ____________ and __________________.
- Transverse waves propagate in the form of _________ and _____________.
- The maximum displacement of the wave from mean position is called ______________.
- Number of vibrations completed in one second is called ________________.
- The distance between two consecutive compressions or two consecutive rarefactions is called ______________.
- Sound of frequency below 20 Hz is called _____________
- velocity of sound = ___________ x wavelenth
- Sound cannot travel in _____________
- Sound of frequency greater than 20 kHz is called ___________
- _______________ is used to check abnormalities of fetus.
- SI unit of frequency is _________.
- ____________ is a device used to measure the depth of sea.
- SONAR’s full form is __________________________________
- Sound travels fastest in ____ medium
- Loudness of sound depend on _____ of vibration.
- Audible range for human beings is from _ Hz to ___ Hz.
- Bats detect their prey using ___________– waves.
- Sound heard after reflection from an obstacle or boundary is called ________-.
- The persistence of sound after the source has stopped vibrations is called ________.
- ___________ is a device used by doctors and its working is based on multiple reflection of sound.
- Loudness of sound is determined by the ___________ of vibrations.
- Checking the functioning of heart with the help of ultrasound is called ________________
- The outer ear is also called ________
- Another function of human ear is to _____________ our body.
- _______ of ear collects sound from the surroundings.
- Ultrasound are produced by some animals like __________, _____________ and _____________.
- Electrical signals from ear are send to the brain via _____________
- The three bones of the ear which amplifies the vibrations are _______ , ______________ and ____________.
- ______________ converts sound into electrical signals.
- The smallest bone in ear is __________ which is also the smallest bone in human body.
- ____________ are regions of higher density and pressure when sound propagates through a medium.