Science

Q.1. Which metal pollute the air of a big city?
A.Copper
B.Chromium
C.Lead
D.Cadmium
Ans. Lead


Q.2. Fathom is the unit of
A.Sound
B.Depth
C.Frequency
D.Distance
Ans. Depth


Q.3. Bell metal is an alloy of
A.Nickel and Copper
B.Zinc and Copper
C.Brass and Nickel
D.Tin and Coper
Ans. Tin and Copper



Q.4. Water is a good solvent of ionic salts because:
A.It has a high specific heat
B.It has no colour
C.It has a high dipole moment
D.It has a high boiling point
Ans. It as a high dipole moment


Q.5. The gas usually filled in the electric bulb is
A.Nitrogen
B.Hydrogen
C.Carbon dioxide
D.Oxygen
Ans. Nitrogen


Q.6. Bromine is a
A.Black Solid
B.Red Liquid
C.Colourless Gas
D.Highly Inflammable Gas
Ans. Red Liquid


Q.7. The average salinity of sea water is
A. 3%
B. 3.5%
C. 2.5%
D. 2%
Ans. 3.5%


Q.8. Which of the following was to be discovered first in the chromospheres of the sun?
A.Krypton
B.Xenon
C.Neon
D.Helium
Ans. Helium


Q.9. Which of the following are the ingredients of gun metal?
A.Iron, Zinc and Titanium
B.Iron and Tin  
C.Iron, Brass and Tin  
D.Copper and Tin  
Ans. Copper and Tin


Q.10. From which mineral is radium obtained?
A.Rutile
B.Haematite
C.Limestone
D.Pitchblende
Ans. Pitchblende

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