Question # 1

Number of electron in the valence shell of elements of grop 16 is.

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3

6

8

16

The king of chemiclas is

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KOH

HCl

NaCl

H2SO4

Elements of group 17 are called.

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Carbon family

Noble gases

Nitrogen family

Halogen family

Which of the following is non-magnetic substace

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iron

Steel

Silver

Nickel

Fire works is an example of ........... reactions.

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Addition

Exothermic

Endothermic

Decomposition

The phenomenon which doe snot lead to global warming.

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Green hous effect

Ozone depletion

Deforestation

Photosynthesis

The section of DNA which has information for making a specific protein is called.

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DNA strand

Nucleotide

Chromosomes

Gene

hardest matter on the Earth is.

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Lead

Diamond

Brick

Urea

What causes object to move.

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Velocity

Unbalnced forces

Balanced force

Friction

A student pushes against a tree with a force of 10 newtons. The tree does not move. What is the amount of force exerted by the treen on the student.

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0

5 N

10 N

20 N

The additional circular places of DNA present in a bacterial cell are called.

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RNA

Nucleotides

Plasmids

Chromatids

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