# CBSE Sample Paper for Class 9 Science

### 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)

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?