Science KI Duniya

Detergents used for cleaning clothes and utensils contain?
A.bicarbonates
B.bismuthates
C.sulphonates
D.nitrates

Which of the following is an element?
A.Ruby
B.Sapphire
C.Emerald
D.Diamond

Q) Air is a/an
A.compound
B.element
C.electrolyte
D.mixture

Q) Fathom is the unit of
A.sound
B.depth
C.frequency
D.distance

Q) Which scientist discovered the radioactive element radium?
A.Isaac Newton
B.Albert Einstein
C.Benjamin Franklin
D.Marie Curie

Q) Decibel is the unit for
A.speed of light
B.radio wave frequency
C.intensity of sound
D.intensity of heat

Q) The main buffer system of the human blood is
A.H2CO3- HCO3
B.H2CO3- CO32-
C.CH3COOH - CH3COO-
D.NH2CONH2- NH2CONH+

Q)Which of the following is used in pencils?
A.Graphite
B.Silicon
C.Charcoal
D.Phosphorous

Q)Sound travels fastest in.....
A) liquid
b) solid
c)gas

Q) How Many Bones in Human Skeleton ?
A)206
B)308
C)309
D)207

Q) Brass gets discoloured in air because of the presence of which of the following gases in air?
A.Oxygen
B.Hydrogen sulphide
C.Carbon dioxide
D.Nitrogen