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

CLASS 8
REPRODUCTION

1. Write one word for following sentences.

a) Fusion of male gamete and female gamete _____________.

b) Name of male gamete ______________.

c) Name of female gamete ________________.

d) Fertilisation which takes place inside the female body ____________.

e) Fertilisation which takes place outside the female body ___________.

f) Animals which lays eggs ______________.

g) Animals which give birth to young ones _____________.

h) Drastic changes which transform larva into adult ___________.

_i. The process of transformation of larva or tadpole into an adult through drastic changes is called _____________________. 

j. The type of asexual reproduction in which an individual reproduces by dividing into two individual is called ______________________. 

k. ___________________________ is essential for the continuation of a species. i l l l___________________________ reproduction is characterised by the fusion of two cells called gametes

2. Match the column :-

 a. unisexual                i) tapeworm

 b. development         ii) cockroach 

c. bisexual                iii) embryo to adult 

d. binary fission        iv) attachment of embryo to uterus

 e. implantation        v) two daughter cells 

CLASS 7
WORKSHEET-RESPIRATION IN ORGANISMS

SCIENCE Class VII

Respiration in organisms

Q1 Name the following:-

       a) Inside the cells the breaking of food into water and carbon di oxide

       b) Cockroach breathe by these structures

       c) In fishes these are the breathing structures.

       d) The products formed as a result of glucose breakdown

       e) The type of respiration taking place in our muscles.

        f) A large muscular sheet that forms the floor of the chest cavity

Q2 Fill in the blanks:-

       i)I f the food is broken with the help of oxygen , it is called as ------------.

       ii) In earthworm exchange of gases takes place through----------

       iii) A cell is the smallest ------- and ----------- unit.

       iv) during breathing ----------- and ------------ take place alternately.

       v) Leaves have tiny pores called ----------.

Q3 Why do all organisms respire?

Q4 What is the difference between aerobic and anaerobic respiration .Write equations for both.

Q5 Why are yeasts used to make wine and bear?

Q6 Why do we get muscle cramps after heavy exercise?

Q7 Draw and label a neat diagram of human respiratory system.

Q8 What would happen if a potted plant is over watered

Q9.How is respiration different from breathing?