nature of matter and composition - Category wise Question and Answer Practice Test with Solutions

Question : 1 [CDS]

Which one of the following petroleum refinary products has the lowest boiling point?

a) Gasoline

b) Kerosene

c) Diesel

d) Lubricating oil

Question : 2

The chemical technique applied to find out age of fossils is knows as

a) Photosynthesis

b) Carbon dating

c) Nuclear fusion

d) Fermentation

Question : 3 [NDA]

The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?

a) $^16O_8$

b) $^1H_1$

c) $^12C_6$

d) $^35Cl_17$

Question : 4 [NDA]

What is the weight of one atom of Hydrogen in grams?

a) $6.62 × 10^{–24}$

b) $6.023 × 10^{–23}$

c) $1.66 × 10^{–24}$

d) None of these

Question : 5

Two substances A and B when brought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. The substance C is

a) a mixture

b) an element

c) a compound

d) none of these.