2nd Term Exam 2014-15 Paper Science For Class 7th

          2nd Term Exam 2014-15
        Paper: Science    Class Seven           Total Marks: 100
Name: ………………………………                    Male
Date: ………………………………..            Gender     Female
            Objective Part    Marks: 40
QNo1. Choose the write answer from choices.
i. An atom which does not have a neutron
    (a) Beryllium        (b) helium        (c) protium    (d) deuterium
ii. Atomic number of boron I s5. The number of its k – shell will be
    (a) 5            (b) 4            (c) 2            (d) 3
iii. Which one is liquid non metal of the following?
    (a) phosphorus        (b) mercury        (c) bromine         (d) iodine
iv. The element which has the greatest quantity in earth’s crust
    (a) oxygen        (b) potassium        (c) aluminum        (d) chromium
v. The metal prepared artificially
    (a) uranium        (b) plutonium        (c) aluminum        (d) chromium
vi. Which one is not metalloid among the following?
    (a) silicon        (b) aluminum        (c) antimony        (d) boron
vii. Metal found in liquid at common temperature
    (a) sodium        (b) potassium        (c) mercury        (d) antimony
viii. …………… is filled in electric bulbs
    (a) nitrogen        (b) oxygen        (c) neon        (d) argon
ix. Which is used in ornaments?
    (a) silver        (b) iron        (c) gold        (d) carbon
x. Human body contains …………elements in the form of compounds
    (a) 28            (b) 29            (c) 26            (d) 34
xi. Oxygen is the most abundantly found element which is ………% by weight in earth crust
    (a) 50            (b) 60            (c) 90            (d) 94
xii. Oxygen was first discovered by a Swedish scientist Scheele in ……..
    (a) 1771        (b) 1773        (c) 1772        (d) 1882
xiii. ………………….. prevents harmful rays omitted from the sun to reach the earth
    (a) oxygen        (b) ozone        (c) carbon        (d) neon
xiv. Hydrogen is used to prepare………….
    (a) sodium        (b) sulphur        (c) carbon        (d) ammonia

xv. Hydrogen was discovered by an English chemist
    (a) Cavendish         (b) Lavoisier        (c) Ruther ford        (d) Ionstien
xvi. A constituent of fuel used in a space ship
    (b) nitrogen         (b) chlorine        (c) oxygen        (d) bromine
xvii. The gas liberated by plants day light is
    (a) carbon dioxide    (b) oxygen        (c) sulphur dioxide    (d) hydrogen
xviii. Human body contains …..% of water by mass
    (a) 60-70        (b) 65-75        (c) 80-85        (d) 90-95
xix. Freezing point of water us
    (a) -10 c◦        (b) -100 c◦        (c) 100 c◦        (d) 0 c◦
xx. Water covers ……….% of earth’s surface
    (a) 71            (b) 70            (c) 90            (d) 30
xxi. Germs are killed by boiling water for ………..minutes
    (a) 5 – 10        (b) 10 – 15        (c) 15 – 30        (d) 30 – 35
xxii. ………….. % of water is used in agriculture
    (a) 82            (b) 92            (c) 72            (d) 84
xxiii. Which physical state of water do the clouds represent?
    (a) solid        (b) liquid        (c) gas            (d) vapors
xxiv. Which method is applied for the removal of suspended impurities?
    (a) boiling        (b) filtration        (c) aeration        (d) decantation
xxv. Under ground water level is called   
    (a) ground water     (b) water table        (c) salinity        (d) all
xxvi. The height of mercury column in the barometer at sea level
    (a) 66 cm        (b) 70 cm         (c) 76 cm         (d) 80 com   
xxvii. If driving wheel is larger and driven wheel is smaller than speed of small wheel
    (a) decreases         (b) increases        (c) remains same    (d) zero
xxviii. What is used in a better way to split timber?
    (a) Scissors        (b) iron        (c) hammer        (d) axe
xxix. The instrument use to measure air pressure in the type of car is
    (a) Simple barometer    (b) aneroid barometer    (c) mano meter    (d) galvanometer
xxx. Which one is different in nature?
    (a) Axe        (b) chisel        (c) ruler        (d) knife
xxxi. Good absorbers are good
    (a) emitter        (b) reactor        (c) radiator        (d) converter
xxxii. From which surface the heat radiate quickly
    (a) Black surface    (b) red surface        (c) silver surface    (d) orange surface
xxxiii. Sun heats the doorknob method of heat transfer contribute to heat the inside doorknob?
    (a) By conduction    (b) by convection    (c) by radiation    (d) all
xxxiv. A ray of light passing through the focus after reflection from a concave mirror becomes
    (a) Horizontal         (b) vertical         (c) paralleled        (d) all
xxxv. If the object lies at C the image formed by the concave mirror will be at
    (a) F            (b) C            (c) P            (d) Z
xxxvi. The image formed by a convex mirror is always
    (a) virtual         (b) real            (c) both        (d) none of these
xxxvii. The center of the spherical mirror is called
    (a) principle axis    (b) pole        (c) center of curvature     (d) all
xxxviii. Boiling point of water is
    (a) 0c◦            (b) 100c◦        (c) 90c◦        (d) 313c◦
xxxix. Heat is a form of
    (a) light        (b) energy        (c) temperature    (d) all
xl. The process by which yogurt heat with out material medium is called
    (a) conduction        (b) convection        (c) eradication        (d) transmission
               
             Subjective part        marks 60
QNo2. Give the short answers of any ten questions.            20

i. Which material is used to make handles and knobs of objects in daily use and why?
ii. What principle do ventilators and windows obey in a house?
iii. Why silver tea pot is preferred to black tea pot?
iv. What is meant by temporary hardness of water?
v. How permanent hardness of water is removed?
vi. What are the disadvantages of hard water?
vii. What is dry ice? Give its uses.
viii. State two properties of hydrogen gas?
ix. What are the natural sources of carbon dioxide?
x. Write a short note on metalloid?
xi. Which compounds are used during the laboratory preparation of oxygen gas?
xii. What are the methods used to kill micro organism present in water?

QNo3. Give the descriptive answers of any four questions.    40

i. What causes land and sea breezes?
ii. An object is lying beyond the center of curvature of the concave mirror. Draw the ray diagram and show the position of the image.
iii. Describe the methods used for the removal of impurities present in water.
iv. Describe the laboratory preparation of hydrogen gas.
v. differentiate between atom and molecule by giving examples.
vi. Write down a note on the classification of elements.