CHEMISTRY

[1] The main use of salt in the diet is to
A. make the taste of food better
B. produce in small amounts the hydrochloric acid required for the digestion of food
C. ease the process of cooking
D. increase the solubility of food particles in water
Ans - B

[2] The monomer of polythene is
A. vinyl chloride
B. ethylene
C. ethyl alcohol
D. None of the above
Ans - B

[3] The luster of a metal is due to
A. its high density
B. its high polishing
C. its chemical inertness
D. presence of free electrons
Ans - D

[4] The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
A. 1.568 x 103
B. 6.023 x 1019
C. 4.84 x 1017
D. 6.023 x 1023
Ans - B

[5] The most malleable metal is
A. platinum
B. silver
C. iron
D. gold
Ans - D

[6] The oil used in the froth floatation process is
A. coconut oil
B. olive oil
C. kerosene oil
D. pine oil
Ans - D

[7] The number of waves in n x 10th Bohr's orbit are
A. n2
B. n
C. n-2
D. n3
Ans - B

[8] 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
Ans - B

[9] The items amenable to detection by soft x-rays are
A. contrabands
B. lead in bullets
C. narcotics
D. genuine coins from counterfeit coins
Ans - D

[10] The material which can be deformed permanently by heat and pressure is called a
A. thermoplastic
B. thermoset
C. chemical compound
D. polymer
Ans - B