Question

1. Which of the following non-metals react and catches fire on exposure to air? *
a) Nitrogen
b)Sulphur
c)Phosphorus
d)Hydrogen

2. Of the following parts of a cell listed below, name the part that is common to plant cell, animal cell and a bacterial cell. *
a)Chloroplast
b)Cellwall
c)Cell membrane
d)Nucleus

3.Which of the following features will help you in distinguishing a plant cell from an animal cell? * a)Cell wall
b)Cell membrane
c)Mitochondria
d)Nucleus

4. An element is soft and can be cut easily with knife. It reacts vigorously with water. This element is *
a)Magnesium
b)Potassium
c)Phosphorus
d)Aluminium

5. The least reactive metal among the following is *
a)Aluminium
b)Lead
c)Sodium
d)Silver

6. The only cell organelle seen in prokaryotic cell is * a)mitochondria b)ribosomes c)plastids d)lysosomes

7. What happens when Iron nails are placed in copper sulphate solution? *
a)copper sulphate and iron gets separated b)iron sulphate and hydrogen gas is evolved c)iron sulphate and copper are formed
d)iron and copper gets separated

8.Which of these cells will have cell wall around them? *
a)Cheek cells
b)Nerve cells
c)Onion peel cells
d)Blood cells

9. The cell organelle found only in animal cell * a)Golgi bodies
b)Centrioles and Centrosomes
c)Endoplasmic reticulum
d)Vacuoles

10. Food cans are coated with tin and not with zinc because *
a)zinc is costlier than tin
b)zinc is less reactive than tin
c)zinc is more reactive than tin
d)zinc has a higher melting point than tin

11. Which of the following method is suitable for preventing an iron frying pan from rusting? * a)Applying paint
b)Applying grease
c)Applying a coat of zinc
d)All of these

12. The smallest cells present in the human body. *
a)Red blood cells
b)Muscle cell
c)Nerve cell
d)White blood cells

13. The metal used extensively in making parts of aero planes and spacecrafts. *
a)silver
b)iron
c)zinc
d)aluminium

14. Non-metal used to make black lead of pencils. *
a)Sulphur
b)iodine
c)graphite
d)carbon

15.Identify the given below cell organelle *  a)Lysosome
b)Mitochondria
c)Endoplasmic reticulum
d)Vacuole

16. Bells are made of metals, because *
a)metals are malleable
b)metals are ductile
c)metals are sonorous
d)metals are lustrous

17.The most abundant metal in earth crust is * a)Cu
b)Al
c)Fe
d)Zn

18. A metal that burns in oxygen with a bright light. *
a)Magnesium
b)Potassium
c)Sodium
d)Phosphorous

19. Thread like body that lies in the nucleus of the cell is *
a)cytoplasm
b)chromosome
c)nucleoplasm
d)nucleolus

20. There are four materials A,B,C,D, A and D are hard and shiny, But B and C are dull and not very hard. *
a)A & D are metals, B & C are non- metals.
b)A & C are metals, B & D are non- metals.
c)B & C are metals, A & D are non- metals.
d)A & B are metals, C & D are non- metals​

Answer 1

Explanation:

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