Isotopes of an element have different numbers of NEUTRONS

Q-1;  Isotopes of an element have different numbers of:

1) electrons
2) protons
3) neutrons
4) leptons
ANSWER: 3 -- NEUTRONS

Q-2; Which one of the following particles travels at the speed of light?

1) neutrons
2) electrons
3) photons
4) muons
ANSWER: 3 -- PHOTONS

Q-3;  Heat is transferred from the sun to the earth primarily by:

1) conduction
2) convection
3) radiation
4) condensation
ANSWER: 3 -- RADIATION

Q-4;  A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is:

1) all converted into heat
2) equal to its potential energy (with respect to the bottom of the plane) when it was at
the top of the plane
3) less than its kinetic energy at the top of the plane
4) dependant on the materials of which the block is made
ANSWER: 2 -- EQUAL TO ITS POTENTIAL ENERGY (WITH RESPECT TO THE BOTTOM OF PLANE) WHEN IT WAS AT THE TOP OF THE PLANE.

Q-5; Short Answer: How much current does a 1500 Watt heater draw if supplied with a
120 Volt source?

ANSWER: 12.5 AMPS

Q-6;The area of thermodynamics concerned with the measuring of thermal properties is called what?

ANSWER: CALORIMETRY

Q-7;The temperature and pressure at which a substance can exist in all three phases of matter simultaneously is called what?

ANSWER: TRIPLE POINT

Q-8; Refracting telescopes, if uncorrected, suffer from chromatic aberration. Chromatic aberration occurs because:

1) red light is focused more strongly than blue light
2) blue light is focused more strongly than red light
3) the outer light rays are focused more strongly than the central rays,
4) the central light rays are focused more strongly than the outer rays.
ANSWER: 2 -- BLUE LIGHT IS FOCUSED MORE STRONGLY THAN RED LIGHT

Q-9;Which of the following scientific instruments has the greatest resolving power?

1) electron microscope
2) light microscope
3) phase-contrast microscope
4) centrifuge
ANSWER: 1 -- ELECTRON MICROSCOPE

Q-10; One curie is equal to:

1) the square root of the binding energy
2) the energy of an alpha-particle
3) 3.7 x 1010 disintegrations per second
4) mc2
ANSWER: 3 -- 3.7 x 1010 DISINTEGRATIONS PER SECOND