Chemistry Quiz on “Properties of Matter and their Measurement”.
1. Which of the following may not be a physical property?
a) Odor
b) Color
c) Density
d) Composition
Answer: d
Clarification: Composition is a chemical property because we can’t find a compound’s composition just by looking at it. We need to run some chemical tests to find out. Odor, color, and density are physical properties, as we can find them just by looking at them.
2. The observation of __________ properties needs a chemical change to occur.
a) Chemical
b) Physical
c) Extrinsic
d) Intrinsic
Answer: a
Clarification: Chemical properties are combustibility, composition, reactivity with acids & bases, etc. So to observe them chemical change has to occur. Combustibility can be known only when extinguished with fire. Composition is a chemical property because we can’t find a compound’s composition just by looking at it. We need to run some chemical tests to find out etc
3. Candela is the S.I. unit of _____
a) Luminous intensity
b) Thermodynamic temperature
c) Amount of substance
d) Electric current
Answer: a
Clarification: Candela is an S.I. unit of luminous intensity with symbol cd. It’s termed a source emitting monochromatic radiation at frequency 540 x 1012 Hertz with the radiant intensity of 1/683 watt per steradian provided in the same direction.
4. How many scientific fundamental quantities are given S.I. units?
a) 5
b) 7
c) 3
d) 9
Answer: b
Clarification: There are seven scientific fundamental quantities i.e. Length(l), Time(t), Mass(m), Electric current(I), Thermodynamic temperature(T), Amount of substance(n) & Luminous intensity(Iv). They can’t be expressed as other quantities i.e. independent.
5. What is the symbol of the amount of substance’s S.I. unit?
a) K
b) s
c) mol
d) kg
Answer: c
Clarification: As the S.I. unit of the amount of substance is a mole, it’s denoted by “mol”. A mole is defined as many elementary entities as there are atoms in 0.012 kilograms of carbon-12.
6. What are the multiples for the prefixes yocto, atto respectively?
a) 10-24, 10-18
b) 10-9, 10-15
c) 10-15, 10-24
d) 10-24, 10-21
Answer: a
Clarification: Yocto is 10 power (-24) and atto is 10 power (-18). These are the standard prefixes used in S.I. system.
7. 1Litre = _______ m3.
a) 1000
b) 0.001
c) 1
d) 10
Answer: b
Clarification: As 1 litre is 1000ml
1000ml = 1000cm3
1000cm3 = 0.001m3
Therefore 1L = 0.001m3.
8. What is the difference in units between Kelvin and centigrade scales of temperature?
a) 212.15
b) 32
c) 298
d) 273.15
Answer: d
Clarification: Kelvin = Centigrade + 273.15. So the difference between in units between Kelvin and centigrade scales of temperature is 273.15.
9. What is the human body temperature in Fahrenheit?
a) 212
b) 98.6
c) 273.15
d) 32
Answer: b
Clarification: Our human body’s temperature is 37°C = 98.6°F = 310K. It’s a known fact and is the same for every human.
10. Convert 40°C to °F.
a) 104K
b) 313°F
c) 104°F
d) 313K
Answer: c
Clarification: 1 Fahrenheit = 9/5 Centigrade + 32.
9(40)/5 + 32 = 9 x 8 + 32 = 104°F.
11. S.I. unit of density is kg.m-3.
a) False
b) true
Answer: b
Clarification: As density is the ratio of mass and volume, it’s S.I. unit is kg.m-3, as the S.I. unit of mass is kg and the S.I. unit of volume is m3.