If an object is in a state of equilibrium, what can be said about all of the forces acting on the object?

Q-1;  If an object is in a state of equilibrium, what can be said about all of the forces acting on the object?

ANSWER: THE SUM OF ALL FORCES ACTING ON THE OBJECT IS ZERO

Q-2; The pressure placed on a square with 1/2 meter sides is 1000 Pascals. How much force is being applied to the square?

ANSWER: 250 NEWTONS

Q-3; What is the ratio of a substance's density to the density of water called?

ANSWER: SPECIFIC GRAVITY (also accept relative density)

Q-4; Which of the following is NOT closely associated with a non-magnetic Phase Diagram?

1) Eutectic Temperature (pron: you-tek-tik)
2) Curie Point
3) Solidus
4) Liquidus Curves
ANSWER: 2-- CURIE POINT

Q-5;A bimetallic strip commonly found in home furnace thermostats works because of the difference in this property of the two metals. Is it:

1) thermal shock
2) thermal conductivity
3) thermal expansion
4) thermal diffusivity
ANSWER: Y -- THERMAL EXPANSION

Q-6; Which of the following physical properties is TRUE of most dense ceramic materials?

1) high tensile strength
2) good ductility
3) high compressive strength
4) high electrical conductivity
ANSWER: Y -- HIGH COMPRESSIVE STRENGTH

Q-7; The Modulus of Elasticity for a material refers to:

1) the ability of a material to resist corrosion
2) the ratio of stress over strain
3) the maximum load over the cross sectional area
4) none of the above
ANSWER: 2 -- THE RATIO OF STRESS OVER STRAIN

Q-8; The rest mass of an electron is closest to:

1) 10-15 kilograms
2) 10-17 kilograms
3) 10-30 kilograms
4) 10-50 kilograms
ANSWER: 3 -- 10-30 KILOGRAMS (accept 9.11 x 10-31kg)

Q-9; Carbon-14 dating is based on the decay of 14C to 14N. What type of radioactive decay is associated with this nuclear reaction?

ANSWER: b-RAY or b DECAY or ELECTRON EMISSION

Q-10; Normal sunlight is non-polarized. Why are polarized sunglasses worn?

ANSWER: REFLECTED LIGHT FROM SMOOTH SURFACES IS POLARIZED

Q-11; Many common household fluids, such as margarine, undergo a decrease in viscosity when subjected to a shearing force. What is this property called?

ANSWER: THIXOTROPIC (pron: thik-sa-trop-ick)

Q-12; How much energy in consumed if a 100 watt light bulb is operated for 10 MINUTES?

ANSWER: 60,000 JOULES or 60kJ or 6X104J

Q-13; If the energy reaching your eyeball at 10 meters from a small light bulb is expressed as x, express the energy which would reach your eyeball at 20 meters?

ANSWER: (1/4)x