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[Solved] JEXPO 2018 Chemistry Question Paper

[Solved] JEXPO 2018 Chemistry Question Paper


[Solved] JEXPO 2018 Chemistry Question Paper



[Solved] JEXPO 2018 Chemistry Question Paper

JEXPO 2018 Physics Question Paper with Solution

Q.1) The number of covalent bonds present in ethylene is

5

6

4

7

 

Answer

Correct Answer: 6

Explanation

No explanation

 

Q.2) The fraction of petroleum used as the jet fuel is

alcohol

kerosene

diesel

petrol

 

Answer

Correct Answer: kerosene

Explanation

No explanation

 

Q.3) Wood charcoal is used in gas masks because

dissolves poisonous gases

has good smell

absorbs poisonous gases

reacts with poisonous gases

 

Answer

Correct Answer: absorbs poisonous gases

Explanation

No explanation

 

Q.4) Complete combustion of hydrocarbons produces

CO + H2O

CO + H2

CO2 + H2O

CO2 + H

 

Answer

Correct Answer: CO2 + H2O

Explanation

Complete combustion of hydrocarbon produces  CO2 + H2O  but incomplete combustion of hydrocarbon produces  CO + H2O

Complete Combustion of Hydrocarbon
CH4 + 2O2 = CO2 + 2H2O

Incomplete Combustion of Hydrocarbon
2CH4 + 3O2 = 2CO + 4H2O

 

Q.5) Neopentane and isopentane are

homologues

isobars

isomers

allotropes

 

Answer

Correct Answer: isomers

Explanation

No explanation

 

Q.6) Dry ice is

solid CO

solid CO2

solid SO2

solid He

 

Answer

Correct Answer: solid CO2

Explanation

Dry ice, sometimes referred to as “cardice”, is the solid form of carbon dioxide. It is used primarily as a cooling agent. Dry ice sublimates at 194.65 K (−78.5°C; −109.3°F), at Earth atmospheric pressures.
Ref : https://en.wikipedia.org/wiki/Dry_ice

JEXPO 2018 Physics Question Paper with Solution

Q.7) Cinnabar is an ore of

Pb

Hg

Zn

Cu

 

Answer

Correct Answer: Hg

Explanation

To get the properties, chemical formula and all other details, click here.

 

Q.8) Gold is alloyed with which metal to make it harder?

C

Hg

Ag

Cu

 

Answer

Correct Answer: Cu

Explanation

Gold is highly malleable metal. Ornaments can’t be made from pure gold because its softness and can’t maintain its rigidity.

In order to maintain its rigidity and easier to work, gold is alloyed with copper or silver. And this also gives a lustrous yellow appearance to the ornaments

 

Q.9) Which of the following is used for making magnets?

Magnalium

Duralumin

Bronze

Alnico

 

Answer

Correct Answer: Alnico

Explanation

No explanation

 

Q.10) Which one of the following metal is the most reactive?

Sodium

Magnesium

Potassium

Lead

 

Answer

Correct Answer: Potassium

Explanation

 

Q.11) Which of the following reactions led to the discovered neutron?

C 6 14  +  H 1 1 → N 7 14  +  n 0 1

B 5 11  +  H 1 2 → C 6 12  +  n 0 1

B 4 8 e +  H 2 4 e→ C 6 11  +  n 0 1

B49e + H24e→C612 + n01

 

Answer

Correct Answer: