CBSE-IX

1.How many moles and molecules are present in 50 Kg marble?

Clue: Marble is calcium carbonate whose molecular mass is 100 u convert 50 Kg to gram ie 50,000 g so number of moles is 50,000/100=500 moles

one mole contains 6X10^23 molecules so calculate the number of molecules by multiplying it with 500




       Give an example of a homogeneous mixture with the solid components
2.       Scattering of light by colloidal particles is known as
3.       A man covers a distance of ‘πr’ along the circumference of a circle of radius ‘r’ What will be his displacement?
4.       Calculate the concentration of 12g of urea in 160g solution
5.       Write a relation between mass and weight
6.       Name the substance that give strength to sclerenchyma
7.       Name a coloured plastid apart from chloroplast present in plastids
8.       What is RER? Write down its function?
9.       Name the elements of Phloem
10.   Write down a situation in which
·             A body moves with constant speed but with uniform acceleration
·             A body with velocity zero but have constant acceleration
11     Napthalene balls disappear once exposed Give reason
12     Which body posses more velocity Justify











13     A man in a bus at rest leans backward while a bus starts Give reason
14     Prove that the acceleration due to gravity at the surface of the earth is GM/R2
15     Draw and mark the parts of a Neuron
16     What are” suicide bags “ why this name?
17     Where do you find squamous epithelium?
18     Name a soft connective tissue? Write its location
19     Distinguish between ligaments and tendons
20     What are adipose tissue? Write an example
21     Distinguish between intercropping and mixed cropping
22     What is apiculture? Name an Indian breed used for this.
23     Derive S=ut+2 at2
24     What is vermin compost?
25     What are the advantages of hybridization? Write two hybrids of rice
26     State Newtons 2nd law and derive the expression for force
27     A ball of mass 2Kg moving with a velocity of 10m/s collide with another ball of mass 1Kg moving in the opposite direction with 12m/s collide and stick with each other find the velocity of the combined body after collision.
28     A planet ‘X ‘attracts another planet ‘Y’ at a distance of 2×105   Km whose masses are 2×10 10 Kg and 0.5×10 10 Kg respectively find the force of attraction between them
29     A car starts from rest and attains a velocity of 36Km/hr during this time it covers a distance of 200m If the mass of the car is 1200Kg How much force must the engine exert to make this change?
30     A stone is dropped from a tower and reaches the ground in 5s Calculate
·         Velocity just before striking the ground
·         Height of the tower

·         Velocity after 2 s





CBSE IX Chemistry Test 2(SA2)                                                                                               Max Marks: 40
1)      Who is known as father of Nuclear Physics?
2)      What are Nucleons?
3)      Name the positively charged and negatively charged particle in an atom?
4)      Who discovered Neutron?
5)      Who proposed the atomic model first? Name the model
6)      What are alpha particles? What is its charge?
7)      Who performed the Gold foil experiment?
8)      What is the contribution of Goldstein?
9)      What are energy levels? Who put forward first this concept?
10)   State Bohr Burry concept?
11)   A neutral atom contains 12 protons how many electrons do it contain? Also write down its electronic configuration?
12)   An atom contains 11 protons and 12 neutrons Write down its
·         Configuration
·         Atomic number
·         Mass number
13)   Write down the valency and valence electron of an element with atomic number 15? State whether it is a metal or a non metal? Justify
14)   Draw the atomic structure of an element with atomic number 20?
15)   What are isotopes? Name two
16)   What are isobars? Give example
17)   What are the uses of Isotopes?
18)    
Element               Number of Protons                         Number of Neutrons     Number of Electrons
   A                                          18                                                     12                         18
   B                                          15                                                     14                         14
   C                                          15                                                     16                         15
   D                                          17                                                     13                         17
·         Identify the isotopes from the above table
·         Identify the isobars from the above table
·         Identify a non metal from the above table
19)       98X48 Write down the mass number, atomic number, number of protons, number of electrons number of neutrons present in the atom
20)   Explain Rutherford’s  gold foil experiment
21)   What are the draw backs of Rutherford’s model?
22)   A sample of an element exist in two isotopes one with mass number 16 which is 70% and other with mass number  20 which is 30% Calculate the mass number of the element present in the sample



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