Who, in 1925, postulated that matter, as well as light, has properties of both waves and particles?
a. Planck
b. Heisenberg
c. de Broglie
d. Einstein
[Ques. 2] Which of the following is true about a diode?
a. A diode causes the voltage to shift in phase by 90, i.e., a right angle.
b. A diode has high resistance in one current direction and low resistance in the opposite current direction.
c. A diode can only be used with a transformer.
d. All filter circuits contain a diode.
e. All of the above.
[Ques. 3] The name of which astronomer is most closely linked with that of Ejnar Hertzsprung?
a. Johannes Kepler
b. Henrietta Leavitt
c. Henry Russell
d. Edwin Hubble
[Ques. 4] Matter waves were confirmed when it was found that electrons
a. diffract.
b. have a plus or minus spin quantum number.
c. possess a negative charge.
d. have mass.
[Ques. 5] In a parallel RLC circuit, where IR = IR, max sin(t), the current through the inductor, IL, is
a. IL = IL, max sin(t).
b. IL = IL, max sin(t).
c. IL = IL, max cos(t).
d. IL = IL, max cos(t).
e. IL = IL, max tan(t).
[Ques. 6] The absolute magnitude of a celestial object is the apparent magnitude it would have if it were placed how far from the Earth?
a. 10 parsecs
b. 3.26 light-years
c. 1 astronomical unit
d. None of the above
[Ques. 7] As the speed of an object decreases, its wavelength
a. remains unchanged.
b. decreases.
c. increases.
d. is zero.
[Ques. 8] In a parallel RLC circuit, where IR = IR, max sin(t), the current through the capacitor, IC, is
a. IC = IC, max sin(t).
b. IC = IC, max sin(t).
c. IC = IC, max cos(t).
d. IC = IC, max cos(t).
e. IC = IC, max tan(t).
[Ques. 9] The brightest planet has an apparent magnitude of about 4 and is named
a. Jupiter.
b. Saturn.
c. Mars.
d. Venus.
[Ques. 10] As the speed of an object increases, its wavelength
a. remains unchanged.
b. decreases.
c. increases.
d. is zero.
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