Test on law of chemical combinations (Chemistry) Class : XI

Answer the following questions:

Choose correct options

1. A balanced chemical equation is in accordance with:

a. Avogadro’s law

b. Law of conservation of mass

c. Law of gaseous volumes

d. All of the laws above.

2.  Which one of the following pair of substances illustrates law of multiple proportions?

a. Calcium oxide and calcium hydroxide

b. Sodium chloride and sodium bromide

c. Carbon monoxide and carbon dioxide

d. None of these

3 The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

a. Constant proportion

b. Conservation of mass

c. Multiple proportions

d. Reciprocal proportion

Match the following:

Column A

1. Law of conservation of mass
2. Law of definite proportions
3. Law of multiple proportions
4. Law of reciprocal proportions
5. Law of combining volumes

Column B 

1. Joseph Proust
2. Antoine Lavoisier
3. Richter
4. Gay lussac
5. Dalton

Answers:

1 b

2 c

3 a

Match

1 vs 2

2 vs 1

3 vs 5

4 vs 3

5 vs 4

TEST ON UNITS AND DIMENSIONS (CLASS: XI)

TEST: UNITS AND DIMENSIONS               MARKS: 10

Write dimensional formulas of the following physical quantities.

1.                  Momentum

2.                  Power

3.                  Energy

4.                  Pressure

5.                  Stress

6.                  Frequency

7.                  Temperature

8.                  Acceleration due to gravitation

9.                  Weight

10.              Density                                                       

Sample test paper (Chapter: Control and Coordination) Biology Class X Board CBSE

Chapter: Control and Coordination                                      TOTAL MARKS: 19

CLASS: X                                                                          TIME: 30min

Board: CBSE                                                                      SUBJECT: BIOLOGY

1. Define reflux. (1)

2. Draw structure of neuron. (2)

3. Explain geotropism in plants. (2)

4. Name some involuntary actions of our body. (2)

5. Give examples of hydrotropism and chemotropism in plants. (2)

6. How do auxins promote the growth of a tendril around a support? (2)

7. Why it is important to have iodized salt in our diet? (2)

8. Why there is change in our appearance as we approach 10-12 years of age? (2)

9. How is our body sugar level controlled naturally? (2)

10. Draw structure of human brain. (2)

Sample Test Paper CHAPTER Acid, Base and Salt (CBSE) Class X

CHAPTER: ACID BASE AND SALT                         TOTAL MARKS: 20

CLASS: X                                                                               TIME: 30min

Board: CBSE

1. Write chemical formula of baking soda? (1)

2. Why common salt becomes sticky during rainy season? (1)

3. Give formula of two acids which are monobasic. (1)

4. An aqueous solution with pH zero is________ (acidic/basic/neutral/amphoteric). (1)

5. What name is given to the water in the compound Copper sulphate-5-water? (1)

6. How bee stings are treated at home? (1)

7. Explain why? Blue vitriol change to white upon heating. (1)

8. Which has higher pH.? A concentrated or dilute solution of HCL? (1)

9. How will you show that acetic acid is monobasic acid (1)

10. Why? Anhydrous calcium chloride is used in desiccators? (1)

11. Why does not an acid show any acidic behavior is the absence of water? (2)

12. Why alkalis like sodium hydroxide and potassium hydroxide should not be left

exposed to air? (2)

   13. Write following

(i) Define an acid.

(ii) What is an alkali?

(iii) Explain the meaning of the term acid salt? (3)

14. What will you observe when:

(i) Red litmus is introduced into a solution of sodium sulphate.

(ii)Methyl orange is added to dil HCl.

(iii)Blue litmus is introduced into a solution of ferric chloride. (3)

SAMPLE QUESTION PAPER (PHYSICS) X (CBSE) FORCE

CLASS: X                                                                   Time: 45min

Chapter: FORCE                                                         Marks: 26

Subject: Physics

1. What is restoring force? (1)

2. Define Law of Inertia. (1)

3. Write C.G.S units of force. (1)

4. Define Dynamic Equilibrium. (1)

5. Write general characters of Non-Contact forces. (2)

6. Write examples of Contact forces. (2)

7. State Second Law of motion. (2)

8. Define the term Linear Momentum. State its SI units. (2)

9. How much acceleration will be produced in a body of mass 10kg acted upon by a force of 2kgf. (2)

10. A body of mass 1.5kg is dropped from a height of 12m. What is the force acting on it during its fall? (2)

11. The momentum of a force of 5N about a point P is 2Nm. Calculate the distance of point of application of the force from the point P. (2)

12. On a see saw, two children of masses 30kg and 50 kg are sitting on one side of it at distances 2m and 2.5m respectively from the middle. Where should a man of mass 74kg should sit to balance it? (2)

13. A body is acted upon by two forces each of magnitude F, but in opposite directions. State the effect of the force if.

(a)    both forces act at the same point of the body.

(b)   two forces act at two different points of the body at a separation r. (2)

14. A spanner (or wrench) has a long handle. Why? (2)

15. What do you understand by the term couple? State its effect. Give two examples of couple action in our daily life. (2)

Sample question paper (CBSE Board Exam) Class X Subject : Biology

TEST : Biology                                    LIFE PROCESSES (SCIENCE)

CBSE Board                                         CLASS: X

Total Marks: 20                                  Time: 30min

1. What are the raw materials of photosynthesis? (1)

2. How many chambers Human heart posses? (1)

3. What is the role of nephrons? (1)

4. What is the role of saliva in digestion? (1)

5. Which unit of kidney does filtration process? (1)

6. Differentiate between transport of materials in xylem & phloem (2)

7. What is the function of diaphragm? (2)

8. Why the blood group of donor and receiver must match? (2)

9. Why the blood groups of donors and receiver person should be same for the transfusion of blood? (2)

10. Explain the nutrition in amoeba with the help of diagram? (2)

11. State two vital functions of kidney? (2)

12. Give detailed structure of chloroplast? (3)

SOLUTIONS BOARD EXAMINATION PAPERS FREE (X, XII) CHEMISTRY PHYSICS BIOLOGY (CBSE, ISC, WB, PSEB)

Dear students

I provide solutions to the board exam questions.
It is absolutely free.
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Research papers/Manuscript (Spectroscopic analysis/ sugar technology/Applied chemical sciences)http://works.bepress.com/aamarpali/

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http://works.bepress.com/aamarpali/

Physics (Electricity) Xth CBSE

PHYSICS (ELECTRICITY)                                                CLASS: X

BOARD: CBSE                                                                  TIME ALLOWED: 45MIN

1. A metallic conductor has loosely bound electrons called free electrons. What is the charge on the metallic conductor?                                                                 1

2. Define the term volt.                                                                                        1

3. State Ohm’s law                                                                                               1

4.   How many electrons are there in 2C charge                                             1

4. Why electrical appliances have fuse wire?                                                  2

5. Heating element of an electric iron is made of which metal. Give reason too?

2

6. Alloys are used in electrical heating devices rather than pure metals. Give reason.                                                                                         2

7. Two metallic wires A and B are connected in second wire A has length l and radius r, while wire B has length 2l and radius 2r.

Find the ratio of total Resistance of series combination and the resistance of wire A, if both the wires are of same material?                                                         2

8. Calculate the resistance of an electric bulb which allows a 20A current when

connected to a 440V power source?                                                          2

9. A house hold uses the following electric appliance;

(i)                Refrigerator of rating 400w for ten hour each day.

(ii)              Two electric fans of rating 80w each for twelve hours each day.

(iii)            Six bulb of rating 18w each for 6hours each day.

Calculate the electricity bill of the household for the month of June if the cost

per unit of electric energy is Rs. 5.00                                                         3

10. Draw a schematic diagram of a circuit consisting of 10V battery, 5 ohm, 3W and1Wresistor, an ammeter and a plug key, all connected in series.

                                                                                                                                    3

chemistry test (periodic table) Xth ICSE Board

CHEMISTRY TEST (PERIODIC TABLE)

CLASS: X                                                                         BOARD: ICSE

1. Fill in the blanks.

a)      There are ------- groups in periodic table.

b)      Group 2 elements are called ----- metals. .

c)      Group 17 elements are called -------- family.

d)      ------- period is the shortest period.

e)      The electronic configuration of Cl is -----.

2. Chose from the options and fill in the blank.

a)      Moving across a ___________ (group, period) of the Periodic Table, the elements show increasing ___________ character. (metallic, non-metallic).

b)      The element below sodium in the same group would be expected to have a ______ (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a _________ (lower/higher) ionization potential than chlorine. 

c)      On moving from left to right in a given period, the number of shells -------- (remains the same/increases/decreases)? 

d)      On moving down a group, the number of valence electrons ------------- (remains the same/increases/decreases)?

e)      Moving across a ___________ (group, period) of the Periodic Table, the elements show increasing ___________ character. (metallic, non-metallic).

f)        The ionization potential------------- (increases, decreases) on going down a Group.

g)      The atomic size of elements ------------------ on moving from left to right in a period (increases, decreases)

3. With reference to the variation of properties in the Periodic Table, which of the following is generally true?

.
a) Electron affinity increases going down a group.
b) Electro negativity increases going down a group.

4. Define valency?

5. How many elements are in the second period?

6. Why are elements at the extreme left and extreme right the most reactive?