Biology, Chemistry, Physics Teacher Kolkata Dr Aamarpali Roy

Biology, Chemistry, Physics Teacher Kolkata Dr Aamarpali Roy

Test Physical quantities 11th physics

[PHYSICAL QUANTITIES , MEASUREMENT DIMENSIONS]

Test questions : Physics  11^th class

1. Filling the blanks:

(i)                  3.0m/s² = ______Km/hr²

(ii)                6.67 x 10^-11 Nm²/Kg² = __________g^-1cm³s^-2

2. Write SI units of thermodynamic temperature, electric current, amount of substance and luminous intensity.

3. Two resistance

 R₁ = 200 + 4 Ω

 R₂ = 300 + 6 Ω

are connected in series. Then what is the equivalent resistance.

4. If velocity, time and force were chosen E=mv² the basic quantities, find the dimensions of mass.

5. The velocity v of wave depend on their wavelength λ density of water ρ and the acceleration due to gravity g. Find relation between these quantities by the method of dimension?

6. The force acting on an object of mass (m) traveling at velocity (v) in a circle of radius (r) is given by

F=mv²/r

            The measurements recorded as m [m= 3.5Kg + 0.1Kg]

            v = 20m/s + 1m/s

            r = 12.5m + 0.5m

            Find the maximum possible

(i)                  fractional error

(ii)                % error in the measurement of force

(iii)               What is the recorded reading

7. What is the difference between A⁰ and AU?

8. Give two methods for measuring time intervals?

9. E , m, l and G denote energy, mass, angular momentum and gravitational constant respectively. Determine the dimensions of El²/m⁵G²

10. State which of the following are dimensionally correct

(i)                  Pressure = Energy per unit volume

(ii)                Pressure = momentum x volume x time

11. The density of cylindrical rod was measured by

ρ =4m/ ПD²l

            The percentage error in m, D, l are 1%, 1.% and 0.5%. Calculate % error in the

 calculated value of density.

class 10 CBSE (Chemical reactions and equations

Total Marks: 20                                                                                    Class : X

(Chapter: Chemical reactions and Equations)

1. The reaction H₂ + Cl₂             2HCl

 (a) Oxidation                                       (c) Decomposition

 (b) Reduction                                      (d) Combination

2. When dil HCl is added to Zinc pieces taken in a test tube

  (a) no change takes place

  (b) H₂ gas bubble appear

  (c) pungent gas evolved

  (d) it turns milky

3. Heat is evolved during which reaction

   (a) endothermic reaction                    (c) combination reaction

   (b) exothermic reaction                    (d) displacement reaction

4. Why food particles are packed in aluminum foil?

5. Identify the substance oxidized and reduced in the following reaction

     CuO(s) + Zn(s)             ZnO (s) + Cu(s)

6. Why is combustion reaction an oxidation reaction?

7. Identify the type of reaction in the following

   (a) A                 B + C              (b) AB + CD               AD + CB

8. In the reaction  

         MnO₂ + 4HCl                 MnCl₂ + 2H₂O + Cl₂ 

(a)    Name the substance oxidized

(b)   Name the oxidizing agent

(c)    Name the reducing agent and the substance reduced

9. Write the balanced equation for the following

(a) Potassium bromide (aq) + Barium iodide (aq)                  Potassium iodide (aq) + 

                                                                                                 Barium bromide (aq)

 (b) Zinc carbonate (s)                 Zinc oxide (s) Carbon dioxide (g)

 (c) Hydrogen (g) + Chlorine (g)                Hydrogen chloride

10. Balance the equation:

    (a) HNO₃ + Ca(OH)₂                 Ca(NO)₂ + H₂O

    (b) NaCl + AgNO₃                 AgCl + NaNO₃

    (c) BaCl₂ + H₂SO₄                 BaSO₄ + HCl

test periodic table

Test : Periodic Table

Questions

1. Define valency. [1]

2. How does valency vary in a group and period in the periodic table? [1]

3. What is the valency of noble gases? [1]

4. How do metals react in a period? [1]

5. How do metals react in a group? [1]

6. How does the reactivity of non–metals changes in a period and group? [2]

7. Give the properties of the oxides in a particular period. [2]

8. What is an amphoteric oxide? [1]

9. Define a neutral oxide. [1]

10. Why does lithium form covalent bond unlike other alkali which forms ionic

bond?

11. What is the general outer electronic configuration of f – block elements? [1]

12. Why do Na and K have similar properties? [1]

13. Arrange the following elements in the increasing order of metallic character :

Si, Be, Mg, Na, P. [1]

14. The atomic number of an element is 16. Determine its position in accordance

to its electronic configuration. [2]

15. Why are elements at the extreme left and extreme right the most reactive? [2]

16. Why does the ionization enthalpy gradually decreases in a group? [1]

17. Why does electronegativity value increases across a period and decreases

down period? [2]

18. How does electronegativity and non – metallic character related to each

other? [2]

link to my tutor profile

http://tutorindia.net/Tutor_Profiles-OTcwMw-Dr_Aamarpali_Roy

Class XI (Chemistry) Organic chemistry test

Test (Hydrocarbons)

1. Define the term homologous series.                                                                   (1)

2.  What are saturated and unsaturated hydrocarbons?                                           (1)

3. Give IUPAC name of the following organic structure:     

 a) (CH₃)₂CHCH(C₂H₅)CH₂CH₂CH₃

            b) CH₂=C(C₂H₅)CH₂CH₂CH₃

            c) (CH₃)₂C=CHC(C₂H₅)=CH₂

            d) CH₃C≡CCH(C₂H₅)₂

            e) (CH₃)₃CC≡CCH₂CH=C(CH₃)₂                                                                         (5)

4.         Write down the products of ozonolysis of 1,2-dimethylbenzene (o-xylene).

            How does the result support Kekulé structure for benzene?                             (2)

5.           In the alkane H3C CH= CH C(CH3)2 CH2 CH(CH3)2, identify 1°,2°,3° carbon

atoms and give the number of H atoms bonded to each one of these.                (3)       

6.       Write Friedel Crafts acylation reaction?                                                                 (2)

7.         Explain  Markovnikov rule.                                                                                   (3)

8.  Write structures of the following compounds                                                             (4)

(i) 2,8-Dimethyl-3, 6-decadiene;

(ii) 1,3,5,7 Octatetraene;

(iii) 2-n-Propylpent-1-ene;

(iv) 4-Ethyl-2,6-dimethyl-dec-4-ene;

9.  Define

(a)    inductive effect, (b) electromeric effect, (c) resonance                             (5)

(d) hyper conjugation. (e) geometrical isomerism

Maths test for new students admitted to class VII

Test paper: Maths  For new student to be admitted in Class :7^th

1.                  Which of the given expressions is not an equation?
A) 7x = 6
B) 4x + 9 = 90
C) 3x > 8
D) 7x + 5 = 9

2.                  The variable in the equation 4x + 12 = 16 is x.
A) True
B) False

3.                  123.456 + 345.098 + 111.111 = ____.
A) 579.665
B) 597.665
C) 597.656
D) 579.565

4.                  23450 is not divisible by 5.
A) True
B) False

5.                  The two whole numbers occurring just before 1000 are ____.
A) 900 and 800
B) 1001 and 1002
C) 998 and 999
D) 996 and 997

6.                  The supplementary angle of 1/2 of 120⁰  is ____.
A) 130^o                                        B) 120^o
C) 60^o                                          D) 100^o

7.                  A polygon having 3 sides is called a ____.
A) pentagon                       B) rectangle
C) square                           D) triangle

8.                  In a city there are two shops which sell groceries. The sales per month of the first shop are Rs 38,000 and that of the second shop are Rs 27,000. The total annual sales of both the shops is ____.
A) Rs 78,000                     B) Rs 65,000
C) Rs 7,80,000                  D) Rs 6,50,000

9.                    is the proper arrangement of fractions in ascending order.
A) True
B) False

10.              A number is said to be exactly divisible by another number if the remainder is ____.
A) 0                       B) 1
C) 2                       D) 5

11.                can be expressed as a mixed fraction as ____.
A)  
B)  
C)  
D) 

12.              127 + (-19) + 23 + (-11) = ____.
A) -100                  B) 130
C) 120                   D) -140

13.              The cost of fencing a rectangular park of length 200 m and breadth 105 m at the rate of Rs 12 per metre is ____.
A) Rs 7320
B) Rs 7444
C) Rs 7544
D) Rs 7644

14.              The angle whose magnitude is 179^o will be a(n)____ angle.
A) obtuse                           B) reflex
C) acute                             D) complete

15.              Additive inverse of 90 is ____.
A) 90
B) -90
C) 0
D) -1

ANSWER

1.      C

2.      A

3.      A

4.      B

5.      C

6.      B

7.      D

8.      C

9.      A

10.  A

11.  C

12.  C

13.  A

14.  A

15.  B

aamarpali in this world: Laws of chemical combination

aamarpali in this world: Laws of chemical combination

Laws of chemical combination

1. Law of conservation of mass or Law of conservation of matter

Statement: Matter can neither be created nor be destroyed.


2. Law of definite proportion

Statement: When two elements combine to form a given compound, they always do so in fixed proportion.


3. Law of multiple proportion

Statement: When two elements combine to form more than one compound, the masses of one element which combine with a fixed mass of the other element are in ratios of small whole numbers.