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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
HIGHER ORDER THINKING SKILLS
FOOD: Where does it come from.
1. You are the manager of a restaurant, make a list of food items you would serve in lunch.
2. What measures are to be taken to avoid wastage of food.
3. Why are humans considered omnivores?
4. List the ingredients of any five food items you relish.
5. Form pairs of words in group A with words in group B.
A—Mustard plant, Nectar, Beetroot, carnivore, omnivore.
B– Honey, sugar, oil, humans, tiger.
6. Name two aquatic plants eaten as food.
COMPONENTS OF FOOD
1. Why is it necessary to have fresh and un-cooked vegetables and fruits in our diets.
2. Doctors advice us to drink atleast two litres of water daily why?
3. What happens (more…)
Download a good collection of questions from Class 8 Science NCERT Textbook. The collection includes questions requiring Higher order thinking skills (HOTS
As per request from numerous student visitors, we are publishing some previous question papers used in the previous years. You can use them to prepare for the present exams and score better marks. The previous question papers give a hint on the type of questions. Practice the questions below to check your timing.
How was the Physics Question Paper for AISSCE (CBSE Class 12) 2012?
Many students complained that many questions of Physics question paper AISSCE 2012 were unexpected and hard.
Do you think so?
Post the questions you felt hard or unexpected here as comment to this post. Let us discuss them here.
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.