CBSE Sample Paper for Class 9 Science
Annual Examination (2020-21)
Class-IX
Time: 2:30 hour/M.M.-80
Note: All questions are compulsory.
(PHYSICS)
1- Slope of velocity time graph gives the____.(1)
a) Distance
b) displacement
c) Acceleration
d) speed
2- inertia of an object depends on its___.(1)
a) mass
b) mass and velocity
c) velocity
d) mass and acceleration
3- Rocket works on the principle of conservation of____.(1)
a) Mass
b) energy
c) Momentum
d) velocity
4- An object exerts a normal force F on a surface of area A. Pressure p acting on the surface is_____(1)
a) P=F/A
b) P=F×A
c) P= A/F
d) P=F/2A
5- What do you mean by the free fall? (1)
6- If the speed of a body is doubled, what is the Change in KE?(1)
7- A battery lights a bulb. Describe the energy changes involved in the process. (2)
8- Explain why some of leaves may get detached from a tree if we vigorously shake its branch? (2)
9- What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer. (2)
10- How much momentum will a dumb bell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be 10 m/sec2. (3)
11- A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity Just before touching the ground. (3)
12- State and prove Law of conservation of momentum. (3)
OR
Drive an expression for Kinetic energy.
13- The mass of the earth is 6×1024 kg and that of moon is 7.4×1022 If the distance between the earth and the moon is 3.84 x 105 km. (5)
(CHEMISTRY)
14- No of valence electron in Cl– ion is- (1)
a) 16
b)8
c)17
d)18
15- Rutherford’s alpha particle scattering experiment was responsible for the discovery of- (1)
a) atomic radius
b)electron
c) proton
d) atomic nucleus
16- An element has the electronic configuration 2,8,7.It ‘s valency 1
a) 7
b)2
c)0
d) 1
17- An element has 2 valence electrons. It is a – (1)
a) Nonmetal
b) metalloid
c) metal
d) gas
18- The no of electrons in an element X is 15 and no of neutrons is 16.Which of the following is the correct representation of elements- (1)
a) 15X31
b) 16X31
c) 15X16
d) 16X15
19- If K and L shells of an atom are full, then what would be the total no of electrons in the atom? (2)
20- Write the electronic configuration of any one pair of isotopes and isobars.(2)
21- Name the three sub atomic particles of an atom. (2)
22- The average atomic mass of a sample of an element X is 162u. What are the percentage of isotops 16X8 and 18X8 in the sample? (2)
23- What do you mean by ionic and molecular compounds? Explain giving two examples of each? (2)
24- Write the chemical formula of zinc chloride. Calculate its molecular mass, also calculate the no of moles in 34gm of zinc chloride (Given atomic mass of Zn=65u and Cl=35.5u). (3)
25- If the mole of carbon atom weight-12gm, what is the mass of 1 atom of carbon? (3)
26- Calculate the percentage composition of all the elements present in calcium phosphate Ca3(PO4)2 [Given atomic mass of Ca=40u,P=31u,o=16u].(3)
27- Vitamin C contain three elements i.e. carbon=40.9%, hydrogen=4.58%, oxygen=54.2%.Determine the simplest formula of vitamin C. (3)
28- Compare in all the proposed models of an atom like Thomson’s model, Rutherford’s model, Bohr’s model. (3)
(BIOLOGY)
29- Cell wall in plant cells is made of.(1)
a) Starch
b) Glycogen
c) Cellulose
d) Chitin
30- Unit of the nervous tissue is.(1)
a) Cyton
b) Axon
c) Dendron
d) Neuron
31- Kwashiorkor is caused due to the deficiency of- (1)
a) Iodine
b) Vitamins
c) Carbohydrates
d) Protein
32- The outermost layer of human cheek cells is. (1)
a) Cytoplasm
b) Plasma membrane
c) Cell wall
d) Nuclear membrane
33- State any two conditions essential for good health. (2)
34- Name simple types of tissues. (2)
35- Name any two organelles that contain their own genetic material. (2)
36- How does an Amoeba obtain its food? (2)
37- How is prokaryotic cell different from eukaryotic cell? (3)
38- Give three features of cardiac muscles. (3)
39- Difference between infectious and noninfectious disease. (3)
40- Differentiate between parenchyma collenchyma and sclerenchyma on the basis of their cell wall. (5)
OR
What are the modes of transmission of infectious disease?