Here I am providing the list of few questions of the Central Board of Secondary Education class 9 Science Exam Question Paper which you are looking for .

Give reason for the following
Isotopes of an element are chemically similar
An atom is electrically neutral
Noble gases show least reactivity
Nucleus of an atom is heavy and positively charged.
Ions are more stable than atoms.
i) What is meant by the statement – “Frequency of a source of sound is 200 Hz” ii) Give the audible range of frequency of sound for human beings iii) Give the range of frequencies associated with infrasound and ultrasound’.
iv) Explain, how defects in a metal block can be detected using ultrasound. (1+1+1+2)
The mixture will appear translucent in case of:
CuSO4 +water
alum + water
sugar + water
starch + water

On heating a mixture of iron filings and sulphur, it is observed that:
the mixture sublimes
brown fumes are evolved
a grey mass is formed
no change occurs

When solutions of sodium sulphate and barium chloride are mixed, an insoluble solid settles at the bottom of the test tube. Its colour is :
blue
yellow
white
green

After heating salt, common salt and ammonium chloride for a few minutes, we observe the following on the upper part of the inverted funnel:
a reddish brown deposit
a white solid deposit
water droplets
a yellow gas

At 0oc or 273 K, the physical state of water is observed as :
solid
liquid
vapour
both solid and liquid

• What did she observe after churning milk?
• What could be the possible reason for this observation? 2

11. The average atomic mass of a sample of an element ‘X’ is 16.2µ. What is the percentage of
each isotope 16X and 18X in the sample? 2
8 8
12.Why does a wooden block float and an iron block sinks when both are placed on the surface of
water ? 2
13. The gravitational force of attraction between two masses is 16 N. What would be the force of attraction between them if each mass and the distance between them are doubled? 2 14. A child winds his toy car by moving its key. Name the type of energy – i) used up in the process ii) energy transformation taking place in it
The car then runs on the floor of the room. Give the transformation of energy taking
place in it now. 2
• To increase productivity per unit area ,the farmers grow two different types of crops on the same field in definite rows. What is this practice called? What care is required to be taken before selecting two crops for such practice and why? Give any two reasons 3.
• Draw a neat diagram of the leaf epidermis showing pores through which exchange of gases takes place. Label any two parts giving one function of each. 3
• i) Which of the following diseases are protozoan in origin?
a)Dengue b)Malaria c)Kalaazar d)AIDS ii) Suggest any two ways you would like to adopt, to prevent being infected by them. 3
• Write two properties each of a solution, suspension and a colloid with respect to
stability and filterability. 3

• ( i) State ‘Law of constant proportions’.
• Taking the example of water, explain the law of constant proportions.
• Which postulate of Daltons’ atomic theory explains this law? 3
• (i) Write the names of the compounds represented by the following formulae:
a) Na 2S b) KNO 3
• Write the chemical formulae of :
• Aluminum Chloride
• Magnesium oxide

(iii) Find out the mass of 12.044 × 10 23 atoms of magnesium (Given at mass of
Mg = 24.0µ) 3
• A stone is dropped from the edge of the roof.
• How long does it take to fall 4.9 m?
• How fast does it move at the end of the fall?
• What is its acceleration after 1s and 2s?
(given that g = 9.8 m/s2) 3
• A boy weighing 50 kg climbs up a vertical height of 100 m in 200 seconds.
Calculate the –
• amount of work done by him
• potential energy gained by him
• Power of the boy
(given that g = 10 m/s2) 3
• i) In a tug of war, one team (team A) wins and the other team (team B) loses.
Which of these two teams does
a) positive work b) negative work ii) What is the work done in case of a satellite moving around the earth? (2+1) 24 i)Write any three differences between Procaryotic and Eucaryotic cell.
ii)Draw a neat diagram of a typical prokaryotic cell and label any two parts. 5
25. Give reason for the following
• Isotopes of an element are chemically similar
• An atom is electrically neutral
• Noble gases show least reactivity
• Nucleus of an atom is heavy and positively charged.
• Ions are more stable than atoms. 5
26.. i) What is meant by the statement – “Frequency of a source of sound is 200 Hz” ii) Give the audible range of frequency of sound for human beings iii) Give the range of frequencies associated with infrasound and ultrasound’.
iv) Explain, how defects in a metal block can be detected using ultrasound. (1+1+1+2)
• The mixture will appear translucent in case of:
• CuSO4 +water
• alum + water
• sugar + water
• starch + water 1
• On heating a mixture of iron filings and sulphur, it is observed that:
• the mixture sublimes
• brown fumes are evolved
• a grey mass is formed
• no change occurs 1
29. When solutions of sodium sulphate and barium chloride are mixed, an insoluble solid settles at the bottom of the test tube. Its colour is :
• blue
• yellow
• white
• green 1
30 After heating salt, common salt and ammonium chloride for a few minutes, we observe the following on the upper part of the inverted funnel:
• a reddish brown deposit
• a white solid deposit
• water droplets
• a yellow gas 1

• At 0oc or 273 K, the physical state of water is observed as :
• solid
• liquid
• vapour
• both solid and liquid 1


• The given figure represents the curve showing cooling of hot water with time plotted by a student. The part of the curve for which rate of cooling is fastest is:

a) AB b) BC c) CD d) DE 1
• While determining the density of a copper piece using a spring balance and a measuring cylinder, Rama carried out the following procedure:
• Noted the water level in the measuring cylinder without the copper piece.
• Immersed the copper piece in water.
• Noted the water level in the measuring cylinder with the copper piece inside it.
• Removed the copper piece from the water and immediately weighed it using a spring balance
The wrong step in the procedure is :
• Step ‘1’
• Step ‘2’
• Step ‘3’
• Step ‘4’ 1
• In the experiment for determining the velocity of propagation of a pulse in a slinky, we prefer a long slinky/string
• because pulse cannot be formed in a short slinky/string
• because slinky/string is cheap
• so that pulse may move through it easily
• so that time taken by pulse to move from one end of slinky/string to other is more 1 35. Three students performed the experiment on verifying the laws of reflection of sound using a tuning fork as a source of sound. Their experimental set up is shown in figures P, Q, and R.


For the question paper , here is the attachment

Attached Files

Central Board of Secondary Education class 9 Science exam paper.doc (77.5 KB, 109 views)