class 8 science paper

                                                   Class VIII

                                                   Science

Each question has four alternatives marked (a) (b)  (c)  (d) , but only one of these alternatives is the correct answer. Find the correct answer

1.      Which of the following metals does not react with atmospheric oxygen when left in open?

(a)    Sodium    (b) calcium   (c)   gold    (d)   aluminium

2.       Which of the following non metals is liquid at room temperature?

(a)    Mercury     (b)   bromine   (c)    iodine     (d)   hydrogen

3.      Which of the following can be beaten into thin sheet?

(a)    Coal     (b)    phosphorus    (c)   aluminium     (d)    sulphur

4.      The metal which is soft and can be cut with knife?

5.  which of the following has maximum carbon contents?

(a) peat      (b) lignite   (c)   bituminous      (d) anthracite

6.CNG stands for

(a) conventional natural gas     (b)   coal and natural gas   (c)   compressed natural gas  (d)   commercial natural gas

7. which of the following is not true for natural gas?

(a) it is generally found with petroleum deposits

(b) it can be liquefied under pressure

© it is a mixture of different hydrocarbons

(d) it has a low calorific value

8.   water can not be used in :

(a) forest fire     (b) building fire    (c)   electric fire   (D) none of these

9.in which zone of a candle flame does complete combustion take place?

(a) inner zone    (b) outer zone    (c)   middle zone   (d)  all here zones

10. which of the following is not a necessary condition of combustion?

(a) presence of combustible substance

(b) presence of a supporter of combustion

© attainment of ignition temperature of the fuel

(d) presence of carbon dioxide

11. a greenish coating develops on copper utensils due to formation of

(a) CuCI₂      (b) CuO      (c) Cu (OH)₂ .CuCo₃   (d)  CuBr₂ 

12.if you pass current through copper sulphate solution, copper gets dposited on the electrode connected to the ---- terminal of the battery.

(a) positive    (b)   negative     (c)    both    (D) none of these

13.Distilled water is a --- of electricity.

(a) conductor     (b)   insulator   (c)   semi- conductor   (d)  semi—insulator

14. during dry weather ,while combing hair ,sometimes we experience hair flying apart.the force responsible for this is

(a) force of gravity    (b) force of friction     (c)   electrostatic force   (d)  magnetic force.

15.two objects repel each other. this  repulsion could be due to

(a) frictional force only  (b)  electrostatic force only   (c)  magnetic force only  (d)  either a magnetic or an electrostatic force

16. which one of the following forces is  a contact force?

(a) force of gravity    (b)  magnetic force  (c)  force of friction     (d)  electrostatic force

17. whenever the surfaces in contact tend to move or move with resect to each other, the force of friction comes into play

(a)    Only if the objects are solid

(b)    Only if one of the two objects is gaseous

(c)    Only if one of the two objects is liquid

(d)    Irrespective of whether the objects are solid, liquid or gaseous

18.to sharpen the blade of a knife by rubbing it against a surface ,which of the following will be most suitable?

(a) stone  (b) wooden block   (c) plastic block    (d)  glass block

19.  a list of medium is given below.

(a) wood   (b) water  (c)  air   (d)  vacuum

   20. the loudness of sound  depends on:

(a) its amplitude      (b) its time period     (c) its frequency   (d) its speed

21. An electroscope is a device which is used to find if an object is

(a) charged    (b) free of cracks    (c) magnetic   (d) hot

22. the movement of the earth’s plates causes

(a) cyclone    (b) lightening   (c)  earthquake  (d) thunderstorms

23.which of the following statements is correct regarding rods and cones in the human eye?

(a) cones are sensitive to dim light

(b) cones are sensitive to bright light

(c)  rods are sensitive to bright light

(d) rods can sense colour

24. Part of the eye which controls the light entering is called

(a) iris  (b)   lens   (c) cornea  (d) retina

25. We can see a non- luminous object when light :

(a) emitted by the object falls on the eye

(b) is reflected from the object towards our eye

(c) completely passes through the object

(d) gets completely absorbed by the object

26. A toy car released with the same initial speed will travel farthest on

(a) muddy surface     (b) cemented surface  (c) polished marble surface     (d) brick surface

27. Which gland is located on top of the kidneys?

(a) thyroid gland   (b) pituitary gland  (c)    adrenal gland   (d)  pineal gland

28. Which of the following statements are true?

(i) when sperms come in contact with an egg ,on of the sperms may fuse with the egg.

(ii) during Gamete formation, the nuclei of the sperm and the egg fuse to form a single nucleus.

(iii) Fertilization which takes place inside the female body  is called internal fertilization.

(iv) IVF or in vitro fertilization means (fertilization outside the body).

(v) The Foetus divides repeatedly to give rise to a ball of cells.

(vi) The stage of the embryo in which all the body parts can be identified is called a Blastula (ball of cells)

(a) i, iii, v   (b) I, iii, iv     (c)  I, ii , iv     (d)   ii, iii, vi

29.in each hydra, there may be one or more bulges.

These bulges are the developing new individuals and they are called……(a)……Recall the presence of buds in yeast. In hydra too the new individuals develop as outgrowths from a ….(b)…parent. This type of reproduction in which only a single parent is involved is called …(c)….reproduction. Since new individuals develop from the buds in hydra, this type of asexual reproduction is called …(d)….  

(a) a-Buds, b- Two,     c- Asexual, d- budding

(b) a-Buds ,b- single, c- sexual, d- budding

(c) a-eyes, b- single, c- asexual, d- Binary fission

(d) a-Buds, b- single, c- Asexual, d- budding

30. Which of the following disease are caused by virus:

A. Citrus Canker   B.  Rust of Wheat    C. Yellow vein Mosaic of Bhindi (okra)  D. Foot and mouth disease    E. Anthrax    F. Measles  G. Hepatitis A

(a) A,C,E,F     (b) C,D,F,G    (c) C,D,E,G     (d) A,B,E,f

31.Which of the following statements are incorrect?

(i) Oviparous animals give birth to young ones.

(ii) Each sperm is a single cell

  (iii) External fertilization takes place in frog

(iv) A new human individual develops from a cell called gamete

(v) Egg laid after fertilization is made up of a single cell

(vi) Amoeba reproduces by budding.

(a) (i),(v), (vi)        (b)  (i), (iv), (vi)     (c) (i), (iv) only    (d) (i), (iv) , (iii)