Of all the useful alkanes, which petroleum-based
product has molecules that show the largest
continuous-chain structure?
a) gasoline
b) asphalt
c) paraffin wax
d) kerosene
[Ques. 2] A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80 of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket.
a. 0.40 kg/s
b. 0.50 kg/s
c. 0.60 kg/s
d. 0.70 kg/s
e. 0.80 kg/s
[Ques. 3] A saturated hydrocarbon that is made up of eight
carbon atoms and eighteen hydrogen atoms is
named
a) octane.
b) butane.
c) methane.
d) ethane.
[Ques. 4] Hydrocarbons containing one or more benzene
rings are known as
a) aromatic hydrocarbons.
b) cycloalkane hydrocarbons.
c) aliphatic hydrocarbons.
d) synthetic hydrocarbons.
[Ques. 5] A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
a. 42 kN
b. 39 kN
c. 45 kN
d. 48 kN
e. 35 kN
[Ques. 6] Which elements can form triple covalent bonds in
organic substances?
a) oxygen and bromine.
b) sulfur and hydrogen.
c) nitrogen and carbon.
d) fluorine and chlorine.
[Ques. 7] Three particles are placed in the xy plane. A 40-g particle is located at (3, 4) m, and a 50-g particle is positioned at (2, 6) m. Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?
a. (1, 3) m
b. (1, 2) m
c. (1, 12) m
d. (1, 7) m
e. (1, 3) m
[Ques. 8] What is the most common element that forms four
single covalent bonds in organic compounds?
a)hydrogen
b)oxygen
c)carbon
d)gold
[Ques. 9] Any compound that contains carbon is considered
to be
a)a polymer compound
b)a CFC compound.
c)an organic compound.
d)a hydroxyl compound.
[Ques. 10] At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
a. 16 m/s
b. 45 m/s
c. 23 m/s
d. 20 m/s
e. 36 m/s
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