What happened at 10-33 seconds when quarks could bind together for the first time?
A: the universe became transparent
B: the expansion of the universe began
C: helium formed
D: protons and neutrons formed
E: atoms formed
Ans: D: protons and neutrons formed
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Which of the five major divisions of chemistry deals exclusively with carbon compounds?
a. Physical chemistry b. Inorganic chemistry c. Analytical chemistry d. Organic chemistry e. Biochemistry
If you mix a typical aluminum ion (Al, atomic no. = 13) with a typical oxygen ion (O, atomic no. = 8), what compound is formed?
A) Al2O3 B) Al3O2 C) Al13O8 D) Al3O E) Al2O2
The phase angle of an LRC series circuit with an inductive reactance of 200 ? and a capacitive reactance of 100 ? is 40.0°. What is the value of the resistor in this circuit?
A) 200 ? B) 119 ? C) 265 ? D) 156 ? E) 100 ?
When a particular capacitor is connected to a source of sinusoidally varying emf with constant amplitude and a frequency of 60.0 Hz, the rms current is 3.00 A. What is the rms current if the source frequency is doubled?
1.12.0 A 2.6.00 A 3.4.24 A 4.3.00 A 5.1.50 A