2. Name the process by which pure copper sulphate can be obtained from its impuresample.
3. Why are light and sound not considered asmatter?
4. Express the boiling point of water in Celsius as well as Kelvinscale.
5. Whatisplasmamembranemadeupof?
6. Name the smallest cell and the longest cell in human body.
7. What isosmosis?
8. Define the term velocity. What is its unit? Is it a scalar or vectorquantity?
9. What is the relationship between distance travelled and the time elapsed for the motion with uniform velocity?
10. What is the acceleration of a body moving uniform velocity?
Answers
2.Copper sulphate can be obtained from an impure sample by crystallisation. The impurities will remain in the mother liquor whereas the pure copper sulphate will crystallize out.
3.The "particles" of light are called photons and have no mass. In contrast, matter is made up of particles that do have mass. Sound is a little different in that it is the propagation of a pressure wave through a medium of particles. Since it is a wave, it is not considered a form of matter.
4.The boiling point of water in Celsius scale is 100 degree celsius and on Kelvin scale it is 373 K
5.The plasma membrane is composed mainly of phospholipids, which consist of fatty acids and alcohol. The phospholipids in the plasma membrane are arranged in two layers, called a phospholipid bilayer. As shown in the diagram below, each phospholipid molecule has a head and two tails.
6.The longest cell is the nerve cell. The largest cell in the human body is female ovum. Smallest cell in the human body is male gametes, that is, sperm.
7.Velocity is a physical quantity that gives both the speed and direction of motion of the body. Defintion: Velocity of a body is defined as the displacement produced per unit time. ... Velocity is a vector quantity because it requires both magnitude and direction of a body.
8.Velocity is a physical quantity that gives both the speed and direction of motion of the body. Defintion: Velocity of a body is defined as the displacement produced per unit time. ... Velocity is a vector quantity because it requires both magnitude and direction of a body.
9.When the body moves with a uniform velocity i.e., it does not change its speed or direction over the travel, the relation of distance and time is proportional, that is distance travelled remains proportional with the time.
10.The 'acceleration of a body' moving with uniform velocity will be zero as acceleration is defined as the “rate of change of velocity” per unit time. So if the body exhibit uniform velocity, then the rate of 'change of velocity' (dv = 0) will be zero.
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Answer:
1.Crystallisation
2.The "particles" of light are called photons and have no mass . But matter is something having mass. Sound is a little different in that it is the propagation of a pressure wave through a medium of particles. Since it is a wave, it is not considered a form of matter.
3.Boiling point of water is 100°C and 373°K
4.Plasma membrane is composed of organic molecules like lipids and proteins.
5.Smallest cell : Mycoplasma
Largest cell : Ostrich's egg
6.Osmosis: The movement of water through a semipermeable membrane from a low concentration to a high concentration.
7.Velocity : Distance travelled by a body in an unit time in a direction.
SI unit : metre per second (m/s)
It is a vector quantity since the direction is also specified .
8.When the body moves with a uniform velocity i.e., it does not change its speed or direction over the travel, the relation of distance and time is proportional, that is distance travelled remains proportional with the time.
9.Acceleration of a body moving with a uniform velocity = 0 metre per second square
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