Human Eye and Colourful World (CBSE) Class X (Physics)

HUMAN EYE AND COLOURFUL WORLD

(Each question is of 2 marks)

Class X (CBSE) Physics

1.      Why when the sun is overheated at noon, it appears white but when the same sun is near the horizon at sunset, it appears red?

2.      Why stars twinkle at night?

3.      Why ocean is blue in colour?

4.      When we enter the dim light room from bright sunlight outside, why does it take time to see the objects clearly?

5.      How rainbow is formed?

6.      A boy uses spectacles of focal length 50cm. name the defect of vision he is suffering from.

7.      A man can read the number of distant bus clearly but he finds difficulty in reading book. What disease he is having?

8.      Astronauts observe the sky as dark instead of blue why?

9.      Why planets do not twinkle?

10.  Why is a normal eye not able to see clearly the objects placed closer than 25cm.

Heredity and Evolution (Class X) CBSE test paper

Heredity and Evolution

(All questions are of 1 mark)

1.      What are fossils?

2.      What is monohybrid cross?]

3.      Give two examples of analogous organs.

4.      What are vestigial organs?

5.      What are dominant genes?

6.      Define the term evolution.

7.      What is scientific name of Human Beings?

8.      What are allosomes?

9.      Write the scientific term used for ‘Science of Heredity and variation’.

10.  Radish and carrot are homologous or analogous structures?

11.  Write the name of different types of possible blood groups?

12.  Define F1 generation.

13.  What will be the sex of the embryo if an egg is fertilized by the sperm having 22+y composition?

14.  What is dihybrid cross?

15.  Define the term progeny.

Test paper on Periodic classification of the elements (X) CBSE

Periodic classification of the elements.

(CBSE) Class X Test

1. Write electronic configuration of C and Na.  (1)

2. The atom of an electronic configuration 2 8 8 2 belongs to which period? (1)

3. Which is more reactive F or Cl?  (1)

4. Which is bigger in size Cl/Cl^- ? (1)

5. Define the law of Octaves? (2)

6. Why elements of a same group show same valency? (2)

7. Discuss the position of H atom in a periodic table. (2)

8. Differentiate metals and non metals? (2)

9. Define modern periodic law. (2)

10.What are metalloids? Explain with example. (2)

Lewis structures of chemical compound

Draw Lewis Structure of following

1. NH₃

2. CO

3. CO₂

4. CH₄

5. HNO₃

6. HCl

Chemistry (Class X)(CBSE) Second term test paper on periodic classification of elements)

Class X (CBSE)

Second Term

 

PERIODIC CLASSIFICATION OF ELEMENTS:

 

Note: Question 1-3 are 1 mark each, Questions 4-10 are 2 marks each.

 

1.      What is general trend in atomic size as you move from left to right in a period?

2.      Why all the atoms of a period have different chemical properties?

3.      How many electrons are present in valence shell of Cl?

4.      What are the limitations of Dobernier’s classification?

5.      What are noble gases? Explain their characteristics?

6.      Write the electronic configuration of Na, O, F and C.

7.      Explain out of ‘Na’ and ‘K’ who is more electropositive in nature?

8.      Why atomic number of an element is more important than its mass number?

9.      Compare Na and K with respect to their valence, formula of their oxide and formula of their chloride.

10.  Atomic number of an element X is 17. Predict its valence and tell whether it is metal or non metal?

CBSE X (Chemistry) Second term (Test paper)

Class X

Second term

Unit: Chemical Substances –Nature and Behaviour

CARBON COMPOUNDS

(Question 1-10 are 1 Mark, Question 11-14 are 2 Marks and Question 15-18 are 3 Marks)

1.       Name the following functional group.  (–OH, -COOH)

2.       Give electron dot structure of CH₃Cl.

3.       Write formula of methanol.

4.       Draw structure of Chlorobutane.

5.       What are oxidizing agents?

6.       Name the functional group present in the compound               CH₃CH₂NH₂.

7.       What is the odour of the acetic acid like?

8.       Name the CH₃C=CH.

9.       How many C-H bonds are present in ethane C₂H₆.

10.   What is the need to denature alcohol?

11.   Give one example of substitution reaction.

12.   Draw structural formula of all isomers of hexane.

13.   Write chemical equation showing decarboxylation reaction of ethanoic acid.

14.   What are enzymes? Name the enzyme which ferments sugar cane to ethanol?

15.   What are synthetic detergents? Give example and how it is better than soap?

16.   What is homologous series? Explain with example. By how many carbon atoms and hydrogen atoms do any two adjacent homologues differ?

17.   What are esters? Write chemical equation showing formation of ester?

18.   Write  the reaction and name the products formed.

a)      Acetic acid and sodium hydroxide are heated together.

b)      Ethanol is burnt in oxygen in the presence of alkaline KMnO₄

   

Compound interest

Compound Interest

 (i)                  Find the amount and the 

             compound interest on 8000 

              at 5% p.a for 2 years.

Principal = Rs 8000/-

Rate of Interest = 5% p.a

Interest for the first year 

= 8000 x 5% x 1/100 = Rs 400

                                  

                 Amount for the first year or 

                  principal for the second year

                              = (8000 + 400) Rs = 8400 Rs

   

Interest for the second year 

= 8400 x 5% x 1/100 = Rs 420

                               Amount for the second year

                              =  (8400 + 420) Rs = 8820 Rs

                              Total Compound Interest

                              = 8820 – 8000 Rs = Rs 820  

chemistry test paper (XII) Amines, biomolecules, polymers, chemistry in every day life

TEST PAPER-CHEMISTRY

CLASS-XII

1.    Draw resonance structures of Aniline?

2.    Write Hoffman elemination reaction?

3.    Draw D-Glucose?

4.    What is muta – rotation?

5.    Explain tertiary structure of Proteins?

6.    Write defination of Enzyme?

7.    Write difference between Fibrous proteins and Globulor Proteins?

8.    Write  structure of Nylon-6?

9.    Define polymerisation?

10.  What is denaturation of portein?

11.  What is Condensation Polymerisation?

12.  What are antacids?

13.  What is Hard Water?

14.  Draw Structure of Zwitter-ion from of alpha amino acetic acid?

15.  What is translation?