Class -12

Date – 17-04-2020

Home Assignment

Subject - Business studies

Chapter – 4 (Planning)

Write and learn the understanding -based questions (1-7) (4marks)

Write and learn the Application-based questions (1-9) (1 marks)

Subject – Accountancy

Chapter-4 (admission of a partner)

Question based on incomplete information. Solved the problem 1 to 10 in your practice

notebook.

Subject - Economics

Chapter- 5 (Money)

Write and learn Reason based questions (1- 16)

Write and learn the HOTS & Applications questions (1-5)

Collect data for last ten years as per information given for the following:

1.What is the rank of India in corruption at world level?

2. Total No. of Universities and colleges in India.

Class -12

Subject-Chemistry

Date-17/04/20)

Chapter- Chemical Kinetic

Assignment-4

(Do it in your practice notebook)

Q.1. The reaction between H2(g) and O2(g) is highly feasible yet allowing the

gases to stand at room temperature in the same vessel does not lead to the

formation of water. Explain.

Q.2. Why does the rate of a reaction increase with rise in temperature?

Q.3. Oxygen is available in plenty in air yet fuels do not burn by themselves at

room temperature. Explain.

Q.4. Why is the probability of reaction with molecularity higher than three very

rare?

Q.5. Why does the rate of any reaction generally decreases during the course of

the reaction?

Q.6. Thermodynamic feasibility of the reaction alone cannot decide the rate of

the reaction. Explain with the help of one example.

Q.7. Why in the redox titration of KMnO4 vs oxalic acid, we heat oxalic acid

solution before starting the titration?

Q.8. Why can’t molecularity of any reaction be equal to zero?

Q.9. Why molecularity is applicable only for elementary reactions and order is

applicable for elementary as well as complex reactions?

Q.10. Why can we not determine the order of a reaction by taking into

consideration the balanced chemical equation?

Class -12

Subject-Chemistry

(Solution of HW -16/04/20)

Chapter- Chemical Kinetic

Assignment-3

(Do it in your practice notebook)

Q.1

Ans. Bimolecular reaction becomes kinetically first order when one of the

reactants is in excess.

Q.2

And. Rate = k [A]0[B]0 or Rate = k

Q.3

Ans. Already discuss in class

Q.4

Ans. If the reaction is an elementary reaction, order is same as molecularity.

Q.5

Ans. Three, because rate = k [A]3

Q.6

Ans . [R]=[R] –kt 0

for completion [R] = 0 ∴ t = [R]0 / k

Q.7

Ans. During an elementary reaction, the number of atoms or ions colliding to

react is referred to as molecularity. Had this been an elementary reaction the

order of reaction with respect to B would have been 1, but in the 3 given rate law

it is 2 . This indicates that the reaction is not an elementary reaction.

Q.8

Ans. Apart from the energy considerations, the colliding molecules should also

have proper orientation for effective collision. This condition might not be getting

fulfilled in the reaction.

Q.9

Ans. No, the molecularity can never be zero or a fractional number.

Q.10

Ans. (i) Zero (ii) –k (iii) mol L-1 s-1

MD. SR SEC SCHOOL, MANKROLA

CLASS: 12TH

SUBJECT : BIOLOGY

HOME ASSIGNMENTS DATE: 17/04/2020

Good morning students.

Do all the questions of first chapter of your NCERT book .

These all questions should be in your practise note book.

M D Sr. Sec. School Mankrola, Gurugram

Class: 12th (Arts) Date:-17-04-20

Sub: Geography

Learn & Write ch:3 Exercise questionas of part -1 Population Composition

Sub: Phy. Education

Learn and write ch:2 Sports and Nutrition

LongAnswer type questions (14-19) in f/C notebook

MD SR. SEC. SCHOOL

GURUGRAM

HOME WORK

CLASS-XII

SUBJECT-MATH

TOPIC –DIFFERENTIABILITY DATE-17 APRIL 2020

COMPLETE EXERCISE 5.2 FROM YOUR NCERT TEXT BOOK.

MD SR. SEC. SCHOOL

GURUGRAM

HOME WORK

CLASS-XII

SUBJECT-PHYSICS

TOPIC- MAGNETISM DATE -17 APRIL 2020

Answer the following questions:

1. Define 1 ampere of current.

2. Why should spring or suspension wire in galvanometer have low torsional constant?

3. Write two factors by which voltage sensitivity of galvanometer can be increased.

4. Write two factors by which current sensitivity of galvanometer can be increased.

5. How is a galvanometer converted into a voltmeter? Explain

6. A square coil of side 10cm has 20 turns and carries a current of 20A.the coil is suspended

vertically and normal to the plane of coil makes an angle α with the direction of uniform

magnetic field of 0.80 T. if the torque experienced by the coil is 0.96N-m ,then find the value of

α.

7. Define current sensitivity and voltage sensitivity of galvanometer .increasing the current

sensitivity may not necessarily increase the voltage sensitivity of the galvanometer .justify your

answer.

8.

9. Draw the labelled diagram of galvanometer. Explain the function of radial magnetic field inside

the coil.

10. Sate the principle of moving coil galvanometer. Write two reasons why galvanometer cannot be

used as such to measure current in a circuit.

11.

12. Derive an expression for torque acting on a rectangular coil carrying current placed in uniform

magnetic field.

13. Derive an expression for the force between two parallel conductor carrying current.

14. A proton and an α−α− particle enter a uniform magnetic field perpendicularly with the same speed.

a. How many times is the time period of the α−α− particle than that of the proton? b. Also find the ratio of the radii of the circular path of the two particles?

HOME WORK

SUBJECT-ENGLISH

DATED-13-04-2020 CLASS-XII