CBSE NEW GENERATION SCHOOL

RAINBOW ENGLISH SR. SEC. SCHOOLC-3 JANAK PURI, NEW DELHI -58

XII- SCIENCE

ENGLISH

1.a) You are Sonia of Simon Public School, Meerut . Your school has decided to organize a

cultural programme to raise funds for the victims of earthquake. Draft a notice, for your school notice -board

b) You have recently constructed a house with all the facilities in a posh area. As you have decided to give it on rent, draft a suitable advertisement for the “To Let” column of a local daily.

2.

a) ‘Down to Earth’ an environmental awareness magazine has launched a marathon ‘ clean your city campaign’ As an active participant, write a speech on urging students to participate in the campaign.

b) Komal had a discussion with her friend on Information Technology. After getting from her a lot of ideas, she decides to write an article on Information Technology for her school Magazine in 200 words. Imagine you are Komal.

3.

a) You are Ram/Isha, Secretary of Harmony Residents Welfare Association, Karnal. Write a letterto the Editor of ‘ The Herald’ on the problem of frequent power failure faced by the people during the summer season in your locality, giving suitable suggestions to solve this problem.

b) You have noticed many polythene bags full of litter lying along the road early in the morning.

These litter bags cause pollution. You have already written to the concerned authorities, but noaction has been taken so far. Write a letter to the Editor of leading newspaper expressing your views on the nuisance created by plastic bags full of litter. Sign yourself as Parul/ Prem, of B-22, Lajpat Nagar, New Delhi

4. Learn questions and answers of Literature.

5. Read the Novel “The Invisible Man”

CHEMISTRY

1. Write experiments in chemistry practical file. Those have done in chemistry lab.

2. Prepare investigatory project for board practical exam.

3. Learn name reactions those have discussed in class.

ENGINEERING GRAPHICS

1. Draw isometric projections and combinations of solid in a4 size sheet or any drawing file.

2. Complete the workbook up to 19 pages.

3. Prepare 15 machine blocks file.

4. To make the machine blocks in three dimensions (not to scale but approximately) by using soap-cakes or floral foam.

PHYSICS1. Obtain an expression for the torque on an electric dipole in a uniform electric field and give its unit.

2. An electric dipole of dipole moment 20 x 10-6 Cm is enclosed by a closed surface. What is the net flux coming out of the surface?

3. Use Gauss’s law to obtain the expression for the electric field due to a uniformly charged thin spherical shell of radius R at a point outside and inside the shell. Draw a graph showing the variation of electric field with r, for r > R and r < R. 16.

4. Use Gauss’s law prove that the electric field due to a uniformly charged infinite plane sheet is independent of the distance from it.

5. Two charges –q and +q are located at points A(0,0,-a ) and B(0,0,+a) respectively. How much work is done in moving a test charge from point P(7,0,0) to Q(-3,0,0)?

6. Two spherical conductors of radii R1 and R2 are charged. If they are connected by a conducting wire, what is the ratio of the surface charge densities ?

7. Derive an expression for the energy stored in a parallel plate capacitor with air between the plates.

8. Two spheres of copper of the same radii, and hollow and the other solid, are charged to the same potential. On which sphere there is more charge and why?

9. A 600 pF capacitor is charged by a 200 V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. How much electrostatic energy is lost in the process?

10. A slab of material of dielectric constant K has the same area as the plates of a parallel plate capacitor but has a thickness 3/4 d where d is the separation of the plates. How is the capacitance changed when the slab is inserted between the plates?

11. An electric dipole of length 8 cm, when placed with its axis making an angle of 600 with a uniform electric field experiences a torque of 8√3 Nm. Calculate the (i) magnitude of the electric field (ii) potential energy of the dipole, if the dipole has charges of + 4nC.

12. If the potential in the region of space near the point (-2m, 4m,6m) is V = 80�2 + 60�2 volt ,what are the three components of the electric field at that point ?

13. Determine the magnitude of an electric field that will balance the weight of an electron.

14. A hexagon of side 0.1 m has a charge 10 �C at each of its vertices. Determine the potential at the centre of the hexagon.

15. The electric field outside a charged long straight wire is given by E = 1000 � V m-1 and is directed outwards. What is the sign of the charge on the wire? If two points A and B are at distances 0.2 m and 0.4 m respectively from the wire , then calculate VB – VA

MATHEMATICS

BIOLOGY

1. Revise all the chapters done in the class

COMPUTER SCIENCE

Complete your practical and project files as discussed in the class.