1. Which element has the lowest melting point?
(a) Mercury
(b) Hydrogen
(c) Carbon
(d) Helium
2. The element with the highest density:
(a) Mercury
(b) Osmium
(c) Tungsten
(d) Iridium
3. The lightest metal:
(a) Hydrogen
(b) Sodium
(c) Lithium
(d) Francium
4. The element with the highest boiling point.
(a) Carbon
(b) Osmium
(c) Tungsten
(d) Rhenium
5. The most abundant elements in the sun in the correct order.
(a) He,H,O
(b) H, He,O
(c) O,He,H
(d) H,O,He
6. Which element has the second highest density?
(a) Tungsten
(b) Rhenium
(c) Gold
(d) Iridium
7. The most abundant metal in human body.
(a) Oxygen
(b) Iron
(c) Calcium
(d) Potassium
8. What percent of the atmosphere is oxygen?
(a) 20.95
(b) 22.1
(c) 29.2
(d) 18.2
9. What percent of the mass of human body is oxygen?
(a) 90
(b) 65
(c) 18
(d) 45
10. Select the correct order of abundance in the atmosphere.
(a) N,O,Ar,CO2
(b) N,O,CO2,Ar
(c) N,H,CO2,Ar
(d) N,CO2,O,Ar
11. The most common element on the earth’s crust by mass.
(a) Aluminium
(b) Iron
(c) Silicon
(d) Oxygen
12. Which metal has the highest melting point?
(a) Rhenium
(b) Gold
(c) Iridium
(d) Tungsten
13. The most abundant element in the moon:
(a) Iron
(b) Oxygen
(c) Silicon
(d) Magnesium
14. The most abundant metal in earth.
(a) Oxygen
(b) Silicon
(c) Iron
(d) Magnesium
15. The element with atomic number 100.
(a) Nobelium
(b) Bohrium
(c) Fermium
(d) Mendelevium
16. Water has maximum density at………degree Celsius.
(a) 0
(b) 4
(c) 25
(d) 100
17. The gas using for filling balloons.
(a) Nitrogen
(b) Oxygen
(c) Helium
(d) Argon
18. Beryllium aluminium silicate is known as….
(a) Alum
(b) ruby
(c) Topaz
(d) Emerald
19. The isotope using for radio carbon dating.
(a) Carbon-14
(b) Cobalt-60
(c) Uranium-23
(d) None of these
20. Which is not correctly matched?
(a) Black lead-graphite
(b) Solid CO2-dry ice
(c) Nitrous oxide-laughing gas
(d) Helium –chemical sun
21. The best non-metallic conductor of electricity.
(a) Silicon
(b) Germanium
(c) Graphite
(d) Boron
22. Which is used for vulcanization of rubber?
(a) Sulphur
(b) Sodium
(c) Phosphorus
(d) Iron
23. The first trans uranic element.
(a) Plutonium
(b) Neptunium
(c) Einsteinium
(d) Fermium
24. Most chemically reactive element?
(a) Hydrogen
(b) Oxygen
(c) Carbon
(d) Fluorine
25. The colour of sodium vapour lamp.
(a) Yellow
(b) Blue
(c) Violet
(d) Red
26. The essential constituent of chlorophyll.
(a) Manganese
(b) Sodium
(c) Potassium
(d) Magnesium
27. The first to isolate aluminium from bauxite.
(a) Oesterd
(b) Wohler
(c) Charles martin Hall
(d) Henry Bessemer
28. The main constituent of bone.
(a) Calcium carbonate
(b) Calcium silicate
(c) Calcium phosphate
(d) None of these
29. The most abundant inert gas.
(a) Radon
(b) Sodium
(c) Krypton
(d) Argon
30. Which is known as the ‘metal of future’?
(a) Uranium
(b) Platinum
(c) Tantallium
(d) Titanium
No comments:
Post a Comment