Grv
05-23-2009, 06:00 AM
Hiiiiiii Everybody.Here r some good science questions.Tell me how many did u answer.
1-Why does the sun appears circular during evening hours.
2- a) What is the action on litmus of?
i. Dry ammonia gas
ii. Solution of ammonia gas in water.
(b) State the observations you would make on adding ammonium hydroxide to aqueous
solutions of:
i. Ferrous sulphate
ii. Aluminium chloride.
3- Why pH scale limited to a fixed range.
4- Give two safety measures, which will you, take while decomposition reaction of ferrous sulphate?
5- What do you mean by family of salts. Name a sodium salt used to softening hard water.
6- A bird sitting on 11000V wire is not hurt while a person touching 220 V wires affected very much even die. Why so?
7- A road tanker carrying an acid was involved in an accident and its content spilled on road. At the side of the road, iron drains covers began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the river.
(i) The word ‘melting’ is incorrect used in the report. Suggest a better name that should have been used for this purpose.
(ii) Explain why the drain covers began fizzing as the acid ran over them. (3)
8-(a) What is the reactive site in ethene?
(b) Three hydrocarbons X, Y, Z have melting points –183o C, -138o C, and –95 o C respectively. Which has maximum number of carbon in molecules.
(c) An alcohol having molecular mass 56. Give its structure.
(d)Give acidified dehydration reaction of an alcohol having molecular mass 46.
9- Define linear magnification of mirror.
10- If a clock have marks instead of words and it is placed in front of plane mirror. The time seems in mirror is 10:30 then what will be the actual time.
11- Give relationship between wavelength of blue and red light.
12- What is the normal room temperature?
13- Why nitrogen is essential for plants. In which inorganic form plants take it up.
14- Write one feature that is common to each of the following pairs of term/organs.
(a) Glycogen and starch.
(b) Chlorophyll and haemoglobin.
(c) Gills and lungs
(d) Arteries and veins.
15- State a reaction in which SO2 acts as an oxidising agent.
16- With respect to air the refractive indices of water and benzene are 1.33 and
1.50 respectively. Calculate the refractive index of benzene with respect to
Water
17- Explain the process of 'photosynthesis' in plants. List four factors which influence this process and describe how each of them affects the rate of the photosynthesis process.
18- Write the chemical equation to represent the reaction taking place when copper
oxide is heated in a stream of hydrogen.
19-The electric power consumed by a device may be calculated by using either of the
two expressions P = I2R or P = V 2/R. The first expression indicates that it is directly proportional to R whereas the second expression indicates inverse proportionality.
How can the seemingly different dependence of P on R in these expressions be explained?
20-Atomic number is considered to be a more appropriate parameter than atomic mass for
classification of elements in a periodic table. Why?
How does atomic size of elements vary on moving from
(i) left to right in a period.
(ii) from top to bottom in a group.
Give reasons for your answers.
21-How much force is exerted by a magnetic field on a stationary charge?
22-What is the direction of magnetic field at the centre of a current-carrying circular
loop?
23-Where is the magnetic field due to current through a circular loop is uniform?
24-Why do we use power supply of two different current ratings at our homes?
25-Leaves of a healthy potted plant were coated with Vaseline to block the stomata. Will this plant remain healthy for long? State three reasons for your answer.
25-Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their
structure and functioning.
26-Name a non-nucleated cell present in human blood and state 1 functions of this cell.
27- Write necessary conditions for autotrophic nutrition and its by-products?
28- Name any three waste products of plants?
29- Name three excretory organs of man.
30-What is the structural difference between the auricles and ventricles?
31-What is the difference between the food habits of organism belonging to the forest and third
trophic levels? Give example each of organisms belonging to these trophic levels.
32-How biodegradable substances would affect the environment.
33-How non-biodegradable substances would effect the environment.
34-How does recycling of matter or waste materials help in ecological balance?
35-Distinguish between the autotrophs and decomposers.
36- Why does common salt become moist in rainy season?
37- Name the Vitamin which gets oxidised when cut fruits are left exposed to air for a long time.
38- What happens when CL2 gas is passed over dry slaked lime ?
39- Write any two application of pH in daily life?
40-Why is electrolysis of distill water is not possible. How it is made possible.
40- A drop of water is poured over a white powdery substance ‘J’. I was observed the ‘J’ turns in blue substance ‘K’.
(i) What is white powdery substance ‘J’?
(ii) What is blue coloured substance ‘K’ and give nature of ‘K’. Give equation to convert ‘K’ to ‘J’. (2)
41- Differentiate between refraction by a glass slab and a glass prism.
42- Give formulae of oxides and hydrides of group III, VI, VII, VIII describe by Mendeleev.
43- What is the normal room temperature? If water at 348 K is left in a room temperature some heat is lost .Is there any way of collecting the heat lost to environment and making the water hot once it has cooled down.
ALL THE BEST FOR UR EXAMS.
Don't forget to reply if u like the Questions ;-)
1-Why does the sun appears circular during evening hours.
2- a) What is the action on litmus of?
i. Dry ammonia gas
ii. Solution of ammonia gas in water.
(b) State the observations you would make on adding ammonium hydroxide to aqueous
solutions of:
i. Ferrous sulphate
ii. Aluminium chloride.
3- Why pH scale limited to a fixed range.
4- Give two safety measures, which will you, take while decomposition reaction of ferrous sulphate?
5- What do you mean by family of salts. Name a sodium salt used to softening hard water.
6- A bird sitting on 11000V wire is not hurt while a person touching 220 V wires affected very much even die. Why so?
7- A road tanker carrying an acid was involved in an accident and its content spilled on road. At the side of the road, iron drains covers began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the river.
(i) The word ‘melting’ is incorrect used in the report. Suggest a better name that should have been used for this purpose.
(ii) Explain why the drain covers began fizzing as the acid ran over them. (3)
8-(a) What is the reactive site in ethene?
(b) Three hydrocarbons X, Y, Z have melting points –183o C, -138o C, and –95 o C respectively. Which has maximum number of carbon in molecules.
(c) An alcohol having molecular mass 56. Give its structure.
(d)Give acidified dehydration reaction of an alcohol having molecular mass 46.
9- Define linear magnification of mirror.
10- If a clock have marks instead of words and it is placed in front of plane mirror. The time seems in mirror is 10:30 then what will be the actual time.
11- Give relationship between wavelength of blue and red light.
12- What is the normal room temperature?
13- Why nitrogen is essential for plants. In which inorganic form plants take it up.
14- Write one feature that is common to each of the following pairs of term/organs.
(a) Glycogen and starch.
(b) Chlorophyll and haemoglobin.
(c) Gills and lungs
(d) Arteries and veins.
15- State a reaction in which SO2 acts as an oxidising agent.
16- With respect to air the refractive indices of water and benzene are 1.33 and
1.50 respectively. Calculate the refractive index of benzene with respect to
Water
17- Explain the process of 'photosynthesis' in plants. List four factors which influence this process and describe how each of them affects the rate of the photosynthesis process.
18- Write the chemical equation to represent the reaction taking place when copper
oxide is heated in a stream of hydrogen.
19-The electric power consumed by a device may be calculated by using either of the
two expressions P = I2R or P = V 2/R. The first expression indicates that it is directly proportional to R whereas the second expression indicates inverse proportionality.
How can the seemingly different dependence of P on R in these expressions be explained?
20-Atomic number is considered to be a more appropriate parameter than atomic mass for
classification of elements in a periodic table. Why?
How does atomic size of elements vary on moving from
(i) left to right in a period.
(ii) from top to bottom in a group.
Give reasons for your answers.
21-How much force is exerted by a magnetic field on a stationary charge?
22-What is the direction of magnetic field at the centre of a current-carrying circular
loop?
23-Where is the magnetic field due to current through a circular loop is uniform?
24-Why do we use power supply of two different current ratings at our homes?
25-Leaves of a healthy potted plant were coated with Vaseline to block the stomata. Will this plant remain healthy for long? State three reasons for your answer.
25-Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their
structure and functioning.
26-Name a non-nucleated cell present in human blood and state 1 functions of this cell.
27- Write necessary conditions for autotrophic nutrition and its by-products?
28- Name any three waste products of plants?
29- Name three excretory organs of man.
30-What is the structural difference between the auricles and ventricles?
31-What is the difference between the food habits of organism belonging to the forest and third
trophic levels? Give example each of organisms belonging to these trophic levels.
32-How biodegradable substances would affect the environment.
33-How non-biodegradable substances would effect the environment.
34-How does recycling of matter or waste materials help in ecological balance?
35-Distinguish between the autotrophs and decomposers.
36- Why does common salt become moist in rainy season?
37- Name the Vitamin which gets oxidised when cut fruits are left exposed to air for a long time.
38- What happens when CL2 gas is passed over dry slaked lime ?
39- Write any two application of pH in daily life?
40-Why is electrolysis of distill water is not possible. How it is made possible.
40- A drop of water is poured over a white powdery substance ‘J’. I was observed the ‘J’ turns in blue substance ‘K’.
(i) What is white powdery substance ‘J’?
(ii) What is blue coloured substance ‘K’ and give nature of ‘K’. Give equation to convert ‘K’ to ‘J’. (2)
41- Differentiate between refraction by a glass slab and a glass prism.
42- Give formulae of oxides and hydrides of group III, VI, VII, VIII describe by Mendeleev.
43- What is the normal room temperature? If water at 348 K is left in a room temperature some heat is lost .Is there any way of collecting the heat lost to environment and making the water hot once it has cooled down.
ALL THE BEST FOR UR EXAMS.
Don't forget to reply if u like the Questions ;-)