The mass of one Avogadro number of helium atom is

29. The most malleable metal is

A.            platinum              B.            silver

C.            iron        D.            gold

30. The oil used in the froth floatation process is

A.            coconut oil

B.            olive oil

C.            kerosene oil

D.            pine oil

Answer: Option D

31. The number of waves in n x 10th Bohr's orbit are

A.            n2

B.            n

C.            n-2

D.            n3

Answer: Option B

32. The mass of one Avogadro number of helium atom is

A.            1.00 gram

B.            4.00 gram

C.            8.00 gram

D.            4 x 6.02 x 1023 gram

Answer: Option B

33.          The items amenable to detection by soft x-rays are

A.            contrabands

B.            lead in bullets

C.            narcotics

D.            genuine coins from counterfeit coins

Answer: Option D

34. The material which can be deformed permanently by heat and pressure is called a

A.            thermoplastic

B.            thermoset

C.            chemical compound

D.            polymer

Answer: Option B

35.The mass number of a nucleus is

A.            always less than its atomic number

B.            sum of the number of protons and neutrons present in the nucleus

C.            always more than the atomic weight

D.            a fraction

Answer: Option B