Virus

Viruses are microscopic but they are not considered as living beings. They are considered as a borderline case between livings and non- living. A virus behaves as non- living when it is outside a host cell, i.e. a virus does not carry on nutrition, respiration or reproduction when it is outside a host. But once it is inside a host, it behaves like a living - being, i.e. it carries on nutrition, respiration and reproduction when it is inside a host. Examples HIV, TOBACCO MOSAIC, VIRUS (TMV) etc.

Life Cycle of Virus: 

Q1: Is virus a living organism:

a. Yes

b. No

c. Both 1 and 2

d. It is a link between living and non- living.

Answer: d

Q.2  : In which situation, a virus behaves like living organisms?

a.  When it is in the air

b.  When it is in the water

c.  When it is inside the living cell

d.  When it is in the soil 

Ans--c

Q 3. What kind of life processes a virus can perform?

                                                                                                               

Answer: It performs nutrition, respiration and reproduction

                                          

 

Science Quiz- Matters

Science Quiz-3

Quiz

 

1. Arrange solids, liquids and gases in order of increasing compressibility-
   
   1.   Gases < Liquids < Solids
   2.   Solids < Gases< Liquids
   3.   Solids < Liquids < Gases
   4.   Liquids < Gases <Solids
2. Arrange the following substances in the increasing order of intermolecular forces of attraction water, sugar and oxygen.
   1.   oxygen < water < sugar.
   2.   oxygen < water <sugar
   3.   oxygen <sugar< water
   4.   None of these
3. Which of the following are not matter ?
   1.   Book
   2.   Smell of perfumes
   3.   Thought
   4.   Bread
4. Name the state of matter that has definite mass, volume and shape-
   1.   liquid
   2.   gas
   3.   solid
   4.   Liquid and solid
5. According to ancient philosopher matter consists of-
   1.   Three costituents
   2.   Four costituents
   3.   Five costituents
   4.   Six costituents
6. Evaporation is
   1.   Conversion of liquid into vapour state at any temperature below the boiling point of the liquid
   2.   Conversion of solid into vapour state at any temperature below the boiling point of the liquid
   3.   Conversion of liquid into vapour state at the boiling point of the liquid
   4.   None of these
7. Which of the following phenomena would increase on raising the temperature?
   1.   Diffusion, evaporation, compression of gases
   2.   Evaporation, compression of gases, solubility
   3.   Evaporation, diffusion, expansion of gases
   4.   Evaporation, solubility, diffusion, compression of gases
8. Seema visited a Natural Gas Compressing unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions.
   1.   Low temperature, low pressure
   2.   High temperature, low pressure
   3.   Low temperature, high pressure
   4.   High temperature, high pressure
9. During summer, water kept in an earthen pot becomes cool because of the phenomenon of
   
   1.   diffusion
   2.   transpiration
   3.   osmosis
   4.   evaporation
10. Choose the correct statement from the following:
    1.   Conversion of solid into vapour without passing through the liquid state is called vapourisation.
    2.   Conversion of vapour into solid without passing through the liquid state is called sublimation.
    3.   Conversion of vapour into solid without passing through the liquid state is called freezing.
    4.   Conversion of solid into liquid is called sublimation.
11. Which condition out of the following will increase the evaporation of water?
    1.   Less exposed surface area of water
    2.   Adding common salt to water
    3.   Increase in temperature of water
    4.   Decrease in temperature of water
12. The boiling point of water at sea level is
    1.   0°C
    2.   273 K
    3.   373 K
    4.   273°C
13. Which of the following is not correct regarding gases?
    1.   Gases exert pressure
    2.   Gases are more compressible than liquids
    3.   Gases have very weak tendency to diffuse
    4.   Gases have weak intermolecular forces of attraction
14. Which of the following statements is not correct ?
    1.   Steam produces more severe burns on the skin than the boiling water
    2.   Water at room temperature is a liquid.
    3.   Ice at 273 K causes less cooling than water at the same temperature.
    4.   We can sip hot tea from a saucer faster than from a cup.
15. Which of the following state has maximum energy or more severe ?
    1.   ice
    2.   water
    3.   steam
    4.   all have same energy
16. The body tempreture of a normal and healthy person is
    1.   397K
    2.   water
    3.   steam
    4.   all have same energy
17. Mercury is generally used in glass thermometers because-
    1.   It can be easily seen
    2.   It does not stick to glass
    3.   It remains in the liquid state over wide tempreture range
    4.   All are correct
18. Dry ice is-
    1.   water in solid state
    2.   water in gaseous state
    3.   CO2 in liquid state
    4.   CO2 in solid state
19. At what temperature, the Fahrenheit and Celsius scales have the same reading ?
    1.   – 0ºC
    2.   – 40ºC
    3.   – 10ºC
    4.   –32ºC
20. -----is/are sublimate substance
    1.   Dry ice
    2.   Naphthalin ball
    3.   Ammonium chloride
    4.   All
21. Which has high diffusions nature
    1.   liquid
    2.   solid
    3.   gas
    4.   All

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Science Quiz: Metals and non-metals

Science Quiz-Metal and Non-Metal

Quiz

 

1. ........ is used in making mirrors.
   1.   Mercury -Hg
   2.   Silver-Ag
   3.   Magnesium Mg
   4.   Gold- Au
2. Name the metal whose foils are used as packing material.
   1.   Aluminium- Al
   2.   Platinum-Pt
   3.   Gold -Au
   4.   Silver-Ag
3. --------metals can be cut with knife
   1.   silver,gold
   2.   Sodium,Platinum
   3.   Sodium, Potassium
   4.   Potassium, Carbon
4. A solution of ........... in alcohol has antiseptic properties.
   1.   Bromine
   2.   Iodine
   3.   Carbon
   4.   Chlorine
5. Nitrates of ........... find use in photography.
   1.   Gold
   2.   iron
   3.   Silver
   4.   Aluminium
6. ............ is more reactive than magnesium.
   1.   Iron
   2.   Zinc
   3.   Sodium
   4.   Copper
7. Which of the following is a liquid at room temperature?
   1.   Iron
   2.   Bromine
   3.   Iodine
   4.   Phosphorus
8. The metal which is liquid at room temperature is........
   1.   sodium
   2.   bromine
   3.   calcium
   4.   mercury
9. Which one of the following metals is the most ductile?
   1.   Aluminium
   2.   Copper
   3.   Silver
   4.   Gold
10. Which one of the following metals is the most reactive and stored in kerosene?
    1.   Potassium
    2.   Copper
    3.   Gold
    4.   Iron
11. Name the gas evolved when magnesium reacts with dilute hydrochloric acid
    1.   Nitrogen
    2.   hydrogen
    3.   Oxygen
    4.   Chlorine
12. The metal which is not corroded by air, water and acid is
    1.   Aluminium
    2.   Copper
    3.   Iron
    4.   Gold
13. Materials having qualities of both metals and non-metals are
    1.   Metalloids
    2.   Noble metal
    3.   Alloy
    4.   none of these
14. Name the metal which exists native(free) state as well as combined state(with other)
    1.   Gold
    2.   Noble metal
    3.   Alloy
    4.   none of these
15. Coinage metals-
    1.   Copper, iron, silver
    2.   Silver, aluminium, Sodium
    3.   Gold, Potassium, Lithium
    4.   Copper, silver and gold