Ultrasonic waves are allowed to pass through the metallic block and detectors are used to detect the transmitted waves. Answer 2: A substance is said to be in the gaseous state if under normal pressure, its boiling point is below the room temperature. Scientific conception of work, work done by constant force. Answer Multiple cropping and use of modern farming methods are two different ways of increasing production on the same piece of land. Answer: Gases like carbon dioxide and oxygen diffuse in water which is essential for the survival of aquatic animals and plants.
We therefore feel cold as the heat from our palm is absorbed. Cold drink is a liquid state of matter. Because of this expansion, of gases the balloon bursts. As a result, theparticles hit each other and also hit the walls of the container with a force. The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear.
When the second crest is produced the first is 2 cm away from the source? Answer: Bats search out its prey by emitting and detecting reflections of ultrasonic waves. The air around us cannot hold more than a definite amount of water vapour at a given temperature. Why does our palm feel cold when we put some acetone or petrol or perfume on it? At this temperature, after getting the heat equal to the latent heat of vaporization, water starts changing from liquid state to gaseous state. The required volume by cotton is more than the sand and density and volume are inversely proportional. Compressibility is the ability to be reduced to a lower volume when force is applied.
That is why there is hardly any change in the volume as a result of dissolution of sugar in water. Why do people break out in a sweat a lot on a hot humid day? This evaporation makes the water inside the pot cool. Arrange the following in order of increasing density — air, exhaust from chimney, honey, water, chalk, cotton, and iron. But when water enters into the pores, it starts sinking and size is reduced. Note: The sense of smell is not matter.
The transmitter produces and transmits ultrasonic waves. Thus, it evaporates faster and cools faster in a saucer than in a cup. In this way the eardrum vibrates. Ceilings of the concert halls are curved, so that sound after reflection reaches all comers of the hall. Arrange the following in the order of increasing density: air, exhaust from chimney, honey, water, chalk, cotton and iron.
If you move your hand pushing and pulling the slinky alternatively, what will you observe? If its wavelength is 1. Why does our palm feel cold when we put some acetone or petrol or perfume on it? Oxygen is a gas; the forces of attraction are the weakest in gases. Answer There are some pores in an earthen pot through which the liquid inside the pot evaporates. Answer: Sound wave is longitudinal in nature. One strikes the end of the rod with a stone. Is sound wave longitudinal or transverse? Answer 4: Substance undergo change in physical state because both inter-particle spaces and inter-particle forces can be changed by changing the condition of temperature and pressure. Water will evaporate faster under the sun than in shade.
Therefore, burns produced by steam are more severe than those produced by boiling water. Due to its high kinetic energy, the gas molecules hit the walls of the container creating vibrations. Question 2: Define gaseous state of a substance. We therefore, swear more on a humidity day. Go back to main page or move to of page.
What is normal atmospheric pressure? This organization was situated at Sri Aurbindo Marg in New Delhi. Thus on a hot day due to high temperature the speed of sound increases. Student's progress is monitored through assignments and regular assessments. It can be solid, liquid or gas. This is due to an increase in the kinetic energy of solid particles.
What is the usage of high compressibility property of gas? Transverse and longitudinal waves, requirement of medium for sound wave. Answer a Water at room temperature is a liquid because it has fluidity also it has no shape but has a fixed volume that is, it occupies the shape of the container in which it is kept. Answer: In both the cases, sound will be produced by the tuning fork which produces ripples. How is osmosis different from diffusion? Question 5: What type of clothes should we wear in summers? Answer: The loudness of sound is determined by its amplitude. Answer: If the pressure is decreased on solid carbon dioxide it will directly change into gaseous state without process of melting. Neither fixed shape nor fixed volume.
Distinguish between loudness and intensity of sound. Explain two functions of centrosomes. Third law of motion — for every action there is equal and opposite reaction, applications on first, second and third laws of motion. Soln: A: Melting or fusion or liquefaction B: Evaporation or vaporization C: Condensation D: Solidification E: Sublimation F: Sublimation Choose the best answer 1. How did the medium and large farmers obtain capital for farming? The chapter 1 given here comprises of an extensive collection of concepts and covers all the questions from this chapter.