The insulation in walls uses which of the following methods to prevent heat transfer?
a. Conduction
b. Convection
c. Radiation
d. Conduction and convection
e. All of these
[Ques. 2] An electron and a positron (antielectron), both nearly at rest, collide. What particle(s) is(are) produced?
a. One photon of energy 1.02 MeV
b. Two photons of energy 511 keV
c. A pi-meson
d. A K-meson and an anti-neutrino
[Ques. 3] On March 21, the noonday Sun is overhead at what latitude?
a. 0
b. 23.5N
c. 23.5S
d. That of the Tropic of Cancer
[Ques. 4] The heating of a room by a fire in a fireplace is chiefly due to
a. vaporization.
b. radiation.
c. convection.
d. conduction.
[Ques. 5] On December 21, the noonday Sun is overhead at what latitude?
a. 0
b. 23.5N
c. 23.5S
d. That of the Tropic of Cancer
[Ques. 6] The Sun's rays are transmitted to Earth by means of
a. radiation.
b. convection.
c. temperature.
d. conduction.
[Ques. 7] The complementary angle of the angle of an object above the horizon is the
a. zenith angle.
b. altitude.
c. latitude.
d. noon angle.
[Ques. 8] Heat transfer that involves mass movement is
a. temperature.
b. conduction.
c. convection.
d. radiation.
[Ques. 9] The ______________ angle added to the altitude angle equals 90.
a. inclination
b. declination
c. altitude
d. zenith
[Ques. 10] The amount of heat necessary to change the temperature of 1 kg of a substance 1C is
a. 1 cal.
b. the specific heat.
c. the heat difference.
d. 1 J.
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