CLASS -VIII
ASSIGNMENT-SOME NATURAL PHENOMENON
1. Who invented the lightning conductor?

a. Alexander Fleming b. Graham Bell  c. Benjamin Franklin d. Thomas Alva Edison

2. What device is used to protect building from lightning?

a. Crescograph  b. Anemometer c. Lightning Conductor d. Barometer

3. What scale is used to measure the magnitude of earthquake?

a. Richter b. Celsius c. Fahrenheit d. Kilogram

4. The magnitude of earthquakes that occurred at Bhuj and

Kashmir was

a. less than 4 b. less than 2  c. less than 6  d. Higher than 7

5.It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as ___________

 a) Negative b) Positive c) Neutral d) Can be any one) 

6 The power of an earthquake is expressed in terms of magnitude on a scale called

 a) Righter Scale b) Quake scale c) Richter Scale d) Earth Scale

7.Why does a plastic comb rubbed with dry hair attract tiny pieces of paper?

8.Rearrange the steps in the formation of lightning in the form of a flow chart.  

Air become charged, accumulation of charges, movements of air currents and water droplets, streaks of light and sound are produced.

9.. How can you charge the following objects?

. glass rod                    b. Ebonite rod

10.Explain three ways in which a body can be charges?

11.Draw the diagram of an instrument which can be used to detect charges on a body?

12. What is an lighting conductor?

13. What is earthing?why is earthing provided in buildings?

14. Suppose you are outside your house and an earthquake strikes. What precautions will you take to protect yourself?

15.Why is a crackling sound heard while taking out sweaters in winters?

16. What is the principle of an electroscope?

17. Distinguish static electricity from electric current.

ALL THE BEST

VI (6th) Fun with Magnets

VI (6th) Fun with Magnets

Fun with magnets

1. Where was the first natural magnet formed?

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2. Name a magnetic material ?

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3. What are the two ends of a magnet called ?

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4. Name the natural magnet?

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VI (6th) Fun with Magnets MCQ’s

CBSE - Class 6 - Science Chapter :Fun with  Magnets
Multiple choice Questions

(1) When a magnet is suspended freely it always aligns itself in --------  direction?

a) North      

 b) N-S         

c) N-W       

 d) N-E

(2) ---------- is the only natural magnet.

a) Magnetite       

 b) Ebonite     

c) Cobalt     

d) Nickel

(3) Which of the following cannot be used to make a magnet?

a) Cobalt            

 b) Iron                     

c) Ebonite    

d) Steel

(4) Which of the following is not a non-magnetic substance?

a) Glass                     

b) Wood       

c) China ware          

d) Nickel

5) Which of the following gets attracted to a magnet?

a) Copy book           

b) Silver spoon          

c) Comb        

d) Common pins

(6) When a magnet is placed on  a plastic plate with common pins spread on it, then  ----

a) Pins stick all around the magnet        

b) Pins stick at the middle of the magnet

c) Pins stick at the ends of the magnet    

d) None

(7) The North end of the freely suspended magnet points towards -------?

a) Geographical North   

b) Geographical South 

c) Geographical East   

d) Geographical West

(8) The south pole of the freely suspended magnet points towards -------?

a) Geographical North

b) Geographical South 

c) Geographical East   

d) Geographical West

(9) like poles of magnets -------- each other.

a) Attract          

b) Repel         

c)Both a and b       

 d)None

(10)  Unlike poles of magnets -------- each other.

a) Attract          

b) Repel        

 c) Both a and b        

d) None

11) ------------ is the surest test of magnetism.

a) Attraction       

 b) Rotation      

c) Repulsion       

d) None

(12) When a N pole of a bar magnet is brought near the north pole of a freely suspended magnetic needle, then it -----------?

a)Attracts   

b)Repels   

c)It rotates  

d)None

(13) When a S pole a magnet in brought near the N pole of a  freely suspended magnetic needle, then it -----------?

a) None 

 b) Repels  

 c) It rotates  

d) Attracts

(14)____________is a device used by pilots and navigators used to find the direction.

a) barometer       

b )thermometer     

 c) magnetic compass       

 d) none

(15) Magnetism of a magnet is lost by doing which of the following acts

a) Keeping in a box       b)Heating          c)Hammering          d)Both b and c

(16)Which of the following gets demagnetised when a powerful magnet is kept near it

a) Plastic ruler      

b)Compact disc     

 c)Glass tumbler          

d)Wood

(17) Which of the following does not get demagnetised when a powerful magnet is kept near it

a)CD    

b)music system    

c)Cell phone    

d)Comb

(18 ) electric bell is an example of _____________magnet.

(a) Bar magnet     

b) Cylindrical magnet        

c)Electromagnet          

d)Horseshoe magnet

(19)______________ type of magnet is used  in cranes to lift heavy containers from ships.

a)Bar magnet     

b)Cylindrical magnet        

c)Electromagnet          

d)Horseshoe magnet

(20) The nerves in our body transmits messages as __________

a) Electrical impulses      

b) Radio waves        

c) Electromagnetic waves   

 d) None 

ANSWER KEY FOR FUN WITH MAGNETS 
1)b 2)a 3)c 4)d 5)d 6) c 7)a 8)b 9)b 10)a 11)c 12)b 13)d 14)c 15)d 16)b 17)d 18)c 19)b 20)a

Class 6 Getting To Know Plants

Class 6 Getting To Know Plants

MULTIPLE CHOICE QUESTIONS

1) The plants which have branches at the base are -----

a) Herbs    b) Shrubs     c) Creepers     d) Trees

2) Which plant is the example of a herb?

a) Mango     b) China rose     c) Wheat     d) None

3) A plant with weak stem is ----

 a) Mint     b) Sunflower     c) Lemon     d) China rose

4)   The plant which takes the support of the neighboring structures and climbs up is

  a) Tree     b) Shrub     c) Creeper     d) Climber

5) The part of plant which grows above the ground is ----?

a) Shoot system     b) Root system     c) both a & b     d) None

6) The part of the stem in between two successive nodes is ----?

a) Pistil      b) Root     c) Node     d) Internodes

7) The root, stem leaves constitute the --- part of the plant body?

a) Vegetative     b) Reproductive     c) Both a & b     d) None

8) Flowers, Fruits & Seeds constitute the ---- part of the plant body?

a) Vegetative     b) Reproductive     c )Both a & b     d)None

9) The part of the plant which prevents soil erosion is?

a) Stem     b) Flower     c) Root     d) Leaves

10) Banana has -------   roots.

a) Tap      b) Lateral    c) Fibrous    d) None

11) Which of the following has tap root?

a) Wheat     b) Mango     c)Tulsi     d) Both a & b

12) Shoot system develops from ----- of the baby plant or embryo?

a) Cotyledons     b) Roots     c) Callus      d) plumule

13) Example of an incomplete flower is ----?

a)Pea     b)China rose     c) Date palm     d)Mustard

14) When a flower has all the sets of whorls it is described as ------ flower.

a) Complete    b) Incomplete     c) Zygomorphic     d) Actinomorphic

15) ------- bud helps in length wise growth of the plant.

a) Apical                 b) Axillary      c) Both a & b           d) None

16) Branches grow from - - - - - - - - -

a) Roots        b) Apical Buds             c) Axillary Buds      d) Stem

17) The ----------------- is the strongest part in a tree.

a) Stem         b) Root                  c) Trunk        d) None

18) Which of the following is a stem?

a) Turnip       b) Onion       c) Radish       d) Carrot

19) The region of attachment of the leaf with the stem is called the ----------------

a) Petiole       b) Lamina        c) Leaf margin                 d) Leaf Base

20) --------------- is a flowering plant with no leaves

a) Cuscuta     b) Coleus      c) Pistia                  d) Pea

21) Stomata help in -----------------

a) Respiration          b) Photo Synthesis    c) Transpiration        d) All of the above

22) A plant with verigated leaves is --------------------

a) Pea             b) Balsam    c) Coleus       d) Cuscuta

23) The food prepared by leaves is stored as -------------------

a) Starch       b) Sugars      c) Proteins     d) Fats

24) The other name for ovary is--------.

a)Stamen         b) Pistil       c) Carpel          d)Stigma

25) Pollen grains are produced in ------?

a)Flower       b) Ovaries      c) Anthers       d) Fruits.

ANSWER KEY  FOR  GETTING TO KNOW PLANTS

(1) b                       (2)c                        (3)a                        (4)d                        (5)d 

(6) a                       (7)b                        (8)c                        (9)c                        (10)d 

(11)d                     (12)c                      (13)a                      (14)a                      (15)a 

(16)c                      (17)c                      (18)b                     (19)d                     (20)a 

(21)d                     (22)c                      (23)a                      (24)c                      (25)c

class -9 atoms and molecules

Class – IX Subject -Science Atoms and molecules 

Time 1 hr          M.M.30 

(Section A) 10 x 1 = 10 

1. The atomic radius of hydrogen atom is 

a. 0.037 nm b. 0.037 x 10 -9 m  c. both a &b   d. none 

2. Complete the following sentence: In water, the proportion of hydrogen and oxygen is ---------- by mass

a. 1:8 b. 3:4 c. 9:0 d. none 

3. The actual mass of hydrogen atom 

a. 1.673 x 10 ^-24 g b. 1.673 x 10 c.1u d. both a & b 

4. The symbol of cobalt a.C.o. b. CO c. Co. d. none 

5. Atomicity of noble gases is one 

a. True b. false c. can’t say d none 

6. The molecular mass of sulfuric acid 

a. 28 u b. 108 u c. 98u d. none 

7. What are the number of electron and proton in chlorine ion 

a. 17p & 18 e b. 18 p & 17 e c. 17 e & 0 e d. none 

8. The value of symbol ‘N’ a. 6.022 x 10²³ b. 6.022 x 10^-23 c. 0.622 x 10²³ d. none 

9. What is the mass of of 0.2 moles of oxygen atoms? 

a. 2.3 g b. 3.2 g c. .32 g d. none 

10. Write the atomicity of CO₂ gas a. 2 b. 3 c. 0 d. none 

(Section B) 10 X 1 = 10

1.what is meant by saying “the atomic mass of oxygen is 16? 

2. What is the significance of formula H₂O? 

3. Calculate the formula mass of calcium chloride and sodium carbonate 

4. An element Z forms an oxide ZO₃. What is the valency of Z? 

5. Write the Latin names of sodium, iron, mercury and tin. 

6. Define 1 u. 

7. Define electro negativity of any atom. 

8. Name the element represent by the following symbols Hg, Pb, Au, Ag and Sn 

9. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur. 

10. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur. 

(Section C) 3 x 2 = 6 

1. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur. 

2. Give major draw –backs of Dalton’s atomic theory of matter. 

3. Work out the formula of magnesium chloride. 

(Section D) 2 x 2.5 = 5 

6. State the law of conservation of mass. Give one example also. 

7. In an experiment, 1.288 g of copper oxide was obtained from 1.03 g of copper. In anotherexperiment 3.672 g of copper oxide obtain from the 2.938 g of copper. Show that thesefigures verify the law of constant proportion