Class 10 Science Board Exam Sample Paper -3

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Section A

Question 1
What change in colour is observed when silver chloride exposed to sunlight? State the type of reaction?

Question 2
How the glucose is breakdown in different types of respiration?

Question 3
Explain water transportation and food transportation in plants?

Question 4
A solution of substance ‘X’ is used for white washing. What is the substance ‘X’? State the chemical reaction of ‘X’ with water?

Question 5 (i)What is decomposition reactions?
(ii)In what condition it take place?
(iii) Write its importance

Question 6
State the role of following:
(a) Hydrochloric acid
(b) Villi
(c) Glomerulus
(d) Bile juice

Question 7
Draw the diagram of following:
(b) human excretory system
(c) sieve tube and companian cells

Question 8
Give reasons:
(a)Why it is necessary to separate oxygenated and deoxygenated blood in human and birds.
(b)Ventricles are thick walled than atrium.
(c)Respiration considered as exothermic reaction.
Question 9
(a)What happens if lead nitrate is heated?
(b)Name the colour of fumes and residue left ?
(c)Write chemical equation?

Question 10:
Derive an expression for equivalent resistance for the three resistors R1 , R2 and R3 connected in

Section B

Question 11
Sam and his family live in a big apartment and uses the following electric appliances:
(i) Refrigerator of rating 400 W for ten hours each day.
(ii) Five electric fans of rating 80 W each for twelve hours each day.
(iii) Six electric tubes of rating 18 W each for 2 hours each day.
Calculate the electricity bill of the household for the month of July  if the cost per unit of electric energy is Rs. 5.00 per KWH

Question 12
Draw ray diagrams showing the image formation by a concave mirror when an object is placed
(a) between pole and focus of the mirror
(b) between focus and centre of curvature of the mirror
(c) at centre of curvature of the mirror
(d) a little beyond centre of curvature of the mirror
(e) at infinity

Question 13
(i)Draw the pattern of magnetic field lines of a current carrying solenoid.
(ii)What does the pattern of field lines inside the solenoid indicate? (iii)Write one application of magnetic field of current carrying solenoid.

Question 14
(i)Draw the electron dot structure of nitrogen molecule? (ii)Name the gas which is major component of biogas? (iii)How is glacier acetic acid different from acetic acid provided to you in laboratory?
Question 15
Many optical instruments consist of a number of lenses. They are combined to increase the magnification and sharpness of the image. The net power (P) of the lenses placed in contact is given by the algebraic sum of the powers of the individual lenses P1, P2, P3
P = P1 + P2+ P3
This is also termed as the simple additive property of the power of lens, widely used to design lens systems of cameras, microscopes and telescopes. These lens systems can have a combination of convex lenses and also concave lenses.
(a) What is the nature (convergent / divergent) of the combination of a convex lens of power + 4 D and a concave lens of power 2 D ?
(b) Calculate the focal length of a lens of power 2·5 D.
(c) Draw a ray diagram to show the nature and position of an image formed by a convex lens of power + 0·1 D, when an object is placed at a distance of 20 cm from its optical centre.

Question 16
In the experiment to show that CO2 is given out during respiration, a the students use which substance to absorb CO2:
(a)Lime water
(c)KHO solution
(d)Lodine solution

Question 17
Acid present in tomato is :
(a) Methanoic acid
(b) Acetic acid
(c) Lactic acid
(d) Oxalic acid

Question 18
Which one of the given statements is incorrect :
(a) DNA has the complete information for a particular characteristic.
(b) DNA is the molecule responsible for the inheritance of characters from parents to offsprings.
(c) Change in information will produce a different protein.
(d) Characteristics will remain the same even if protein changes

Question 19
The correct pattern of magnetic field lines of the field produced by a current carrying circular loop is :

Question 20
In which year is concentration of hydrogen ion the highest?

A. 2002
B. 2008
C. 2011
D. 2005


This Class 10 Science Board Exam Sample Paper -3 is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.

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