SECTION A

Q.I. Answer the following

  1. Write the number of covalent bonds in the molecule of Propane. 1
  2. Why do soaps not work in hard water? 1
  3. Name the two inert gas elements. 1
  4. Mention any waste products secreted by plants. 1
  5. With which human organ system are the following associated? 2

i)Aorta ii) Alveoli iii) Villi iv) Glomerulus

  1. Li, Na, K were put in one group or triad on the basis of their similar 2

properties. What is the name of the group? State the properties

  1. The magnification produced by a spherical mirror is “-3”. List any two 2

informations you obtained from this statement.

  1. List four characteristics of image formed by plane mirror. 2
  2. What type of defect is presbyopia? How do we correct it. 2
  3. What is meant by homologous series of Carbon compounds. Classify the 3

following into two homologous series and name them-

C3H4, C3H6, C4H6, C4H8, C5H8, C5H10

  1. What is meant by Scattering of light? Explain why the Sun appears red 3

at sunrise.

  1. Write the chemical equation of the reaction of Ethanoic acid with the 3

following- a) Nab)NaOHc)Ethanol

  1. State the basis of classification of elements in the Periodic table? 3

How does the metallic character of element vary as we go down the group?

  1. List the 3 phenomenon of light responsible for the formation of 3

rainbow in the sky.

  1. Write the name and molecular formula of an organic compound having 3

its name suffixed with “ol” and having two carbon atoms in its molecule.

Write a balanced chemical equation to indicate what happens when

this compound is heated with excess of conc. H2SO4 and name of the

product formed.

  1. Draw the following diagram, in which a ray of light is incident on a 3

concave/convex mirror, on your answer sheet. Show the path of this

ray after reflection, in each case.

  1. How does anaerobic respiration take place in muscle and yeast cells? 3

Explain with reaction.

  1. Summaries various digestive glands with their secretions, site of action 3

and end products.

  1. Two lenses have power of i) +2Dii) - 4D what is the nature and 3

focal length of each lens.

An object kept at a distance of 100cm from each of the above lenses.

Calculate image distance and magnification in each of the two cases.

  1. State the laws of Refraction of light. Define absolute and relative 3

refractive index.

  1. The atomic numbers of three elements X,Y and Z are 2,6,10 3

respectively.

a)Name these elements.

b)Which two elements belong to same groups?

c)Which two elements belong to same period?

  1. What are Stomata? What do they perform? With the help of diagram 5

explain the opening and closing of stomata.

  1. Define the following terms in context to spherical mirrors and draw 5

a diagram to show all.

a)Pole b)Centre of curvature c) Principle axis d) Principle focus

  1. Describe double circulation in human being. Differentiate artery 5

and vein. And name the instrument for measurement of heat beat.

  1. Draw a labeled ray diagram to show the image formation in 5

convex lens when the object is placed i) between F and P

ii)Between C and F. Also mention the characteristics of image formed.

SECTION B - (12 Marks)

Q.II. Multiple choice questions.

  1. Take a test tube and put soap and water and shake it well by 1

placing thumb on its mouth. What will you observe:

A)Foam will formB) Test tube becomes hot

B)Soap will settle downD) None of these.

  1. Four students A,B,C,D were asked to take three sets of observations 1

for tracing the path of a ray of light through a glass slab. The choice of

angle of incidence made by them were:

A) 100, 150, 200 B) 150, 200, 250

C) 300, 450, 600 D) 700, 750, 800

The student who would likely to get best result is:

A)Student AB)Student B

B)Student C D) Student D

  1. While performing the experiment to trace the path of a ray of light 1

passing through a rectangular glass slab , four students labeled their

ray diagrams in the manner shown below,. The correct labeling has been

done by student :

A) AB) BC) CD) D

  1. When ethanoic acid is added to a solution of substance X, colourless and 1

odourless gas Y is liberated. The gas Y turns lime water milky. The substance X is:

A)Sodium hydrogen carbonateB) Sodium hydroxide

C)Carbon dioxideD) Sodium chloride

  1. In a preparation of soap, X is used as a solvent: 1

A)Alcohol B) AldehydeC) AlkaliD) Acetone

  1. What will you observe when solid sodium hydroxide is added to 1

acetic acid :

A)Solution turns light greenB) Brown fumes evolved

C) Brisk effervescence formed D) A pungent smelling gas evolved.

  1. The focal length of the concave mirror in the experimental setup 1

shown below, equals:

  1. What kind of lens is used by short-sighted person: 1

A)ConcaveB) BifocalC) ConvexD)Cylindrical

  1. An example of non-luminous object is: 1

A)A candleB) The SunC) The MoonD) An electric bulb

  1. The focus of concave mirror is: 1

A)RealB) VirtualC) UndefinedD) At the pole

  1. An object is placed 1.5m from a plane mirror. How far is the image 1

from the person:

A)3mB) 1.5mC)2mD)1m

  1. Vinegar is a preservative. Chemically it is: 1

A)CH3CHCOOH B)CH3COOH C)CH3CHO D)C2H5OH

Snehal WadwekarPT-I/Sci/X/2017-18Page 1 of 4