Sunday, February 1, 2015

Reproduction Questions Class 10 CBSE

1.     What method will you use for growing jasmine and rose plants?

2.     What is reproduction

3.     Define vegetative propagation? Name three methods of vegetative propagation?


4.     Explain the terms fission and regeneration?

5.     How does binary fission differ by multiple fission


6.     Can you think of reasons why more complex organisms can not give rise to new individuals through regeneration?

7.     What are viviparous and Oviparous  animals
Short answer questions
1.     Give two differences between fission and fragmentation
2.     Name the type of pollination carried out by amoeba
3.     The grafted protion of plant is called_______________
4.     Yeast multiplies by _______________
5.     Budding is a method of asexual reproduction in ____________
6.     Where is DNA contained in a cell
7.     Write two advantages of grafting
8.      The small external projection on the parent body of Hydra is called:
9.      A Piece of Potato tuber will form a new plant if it possesses:
10.             Plasmodium divides by______________
11.            The capacity of organisms to reproduce after being cut into many pieces is called:
12.            The process by which root, stem and leaves give rise to new plants is called:
13.            The thread like structures that develop in the bread mould are___________
14.            What are viviparous and Oviparous  animals

15.             The structures involved in asexual reproduction of rhizopus are_____________

Thursday, January 15, 2015

Management of Natural Resources CBSE 10 class

Q1. Who is a Stake Holder? Name different kinds of stakeholder
Q2. In ___________year Amrita Devi Bishoni led a group of ___________people and sacrificed their lives for the protection of khejri trees I Khejrali village near jodhpur
Q3.Explain briefly about Chipko andolan.  From which village Chipko andolan originated?
Q4. State some measures for the conservation of the wild life?
Q5. What is silviculture and what are its advantages?
Q6. What is meant by rain water harvesting?
Q7. What are the advantages of water stored in the ground?
Q8. Name two factors which can be used to find whether the river water is contaminated or not?
Q9. State some advantages of constructing dams over river?
Q10. Describe some problems associated with contruction of dams in river?


Wednesday, January 14, 2015

Carbon and Its Compounds Worksheet

(Q.1)  What is hydrogenation?
 


(Q.2)  Why are carbon and its compounds used as fuels for most application?
 


(Q.3)  When ethanol is heated with alkaline potassium permanganate solution, it gets oxidized to ____________

(Q.4) What are Substitution and Addition Reactions with examples?

(Q.5)   What is meant by a functional group in an organic compound?

(Q.6)   What are  detergents? Give one example of detergent. Write its two advantages over soap.

(Q.7)  What is meant by homologous series? State any four characteristics.

(Q.8)  Give two uses of ethanoic acid.

(Q.9)  What is molasses?
 


(Q.10)  Saponification and Esterification ?


Saturday, December 27, 2014

Gas Laws and Staticelectricity Woeksheet class 9


                                                           Gas laws

1.  Moist nitrogen at a pressure of 700 mm Hg and temperature 27oC is found to occupy a volume of 100 cm3. Find the volume of dry nitrogen gas at S.T.P.
(Aqueous tension at 27oC is 15 mm Hg)
2.   A given mass of a gas occupies 960 ml at 27oC. What volume will it occupy if the temperature is raised to 177oC, pressure remaining constant.
3.  A gas occupies 200 cm3 at a temperature of 27oC and 720 mm of Hg. Find its volume at 3oC and 740 mm of Hg.
4. What is the pressure-volume relationship of a gas when temperature remains constant?
5. The volume occupied by a certain gas was found to be 5.6 dm3 at 2 atmospheric pressure. If the pressure is increased by 20%, find the new volume of the gas.

                                           

                                                 Static electricity

Question 1

During a thunderstorm the safest place in open is under the trees 
True
False

Question 2
When an ebonite rod is rubbed with a fur, the charge acquired by the rod is positive and by fur is negative.
False
True
 Question 3
The metal foil on the glass bottle of an electroscope is earthed when the electroscope is in use, in order to protect it from any external damage.
False
True
Question 4
The negative charge on a body is due to gain of electrons while the positive charge on the body is due to gain of protons.
False
True
Question 5
Sparking is caused due to flow of electrons through the air between the two non touching charged bodies when kept closer to each other. 
False
True
Question 6
The charge on an unevenly shaped body is uniformly distributed. 
True
False

carbon and its compounds


Question .1. (i) What is the special feature of the structure of : (a) C2H4 (b) C2H2.
(ii) What type of reaction is common to both these compounds?
(iii) Give the name and structural formula of (a) a saturated hydrocarbon, (b) an unsaturated hydrocarbon with a double bond.  
(iv) Copy and complete the following sentence: A saturated hydrocarbon will undergo _________ reactions whereas the typical reaction of an unsaturated hydrocarbon is _________. 
(v) State the term defined by the following :- Compounds containing carbon and hydrogen only.
(vi) State the general formula for a saturated hydrocarbon and give one example and structural formula of the same.
(vii) Draw the structural formula of ethyne. How does the structure of alkynes differ from that of alkenes.
(viii) Fill in the blanks with the correct words : – Alkanes are the (a) _______ [analogous / homologous] series of (b) _______ [saturated / unsaturated] hydrocarbons. They differ from alkanes due to the presence of (c) _________ [double / single] bonds. Alkenes mainly undergo (d) ________ [addition / substiution] reactions.  

Question .2. (i) State the structural formula of ethane.
(ii) Draw the structural formula of the two isomers of Butane. Give the correct IUPAC name of each.
(iii) From the following list, write down the appropriate words to fill in the blanks (a) to (e) below: -
Addition, carbohydrates, CnH2n-2, CnH2n, CnH2n+2, electrochemical, homologus, hydrocarbons, saturated, substitution, unsaturated.
The alkane from an (a) ________ series with the general formula (b) __________. The alkanes are (c) __________ (d) __________ which generally undergo (e) ___________ reaction.


Question 3.Draw  the structure of cyclic Propane

Questions4. Nomeclature of Hydrocarbons. click below link
http://scienceworksheets.blogspot.in/2013/10/chemistry-organice-nomenclature-of.html

Find Least Common Multiple (LCM). 1) 5 and 15 = ...