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Q:

Which elements are malleable and good conductors of electricity?

A) tin and silver B) iodine and silver
C) tin and xenon D) iodine and xenon

Answer:   A) tin and silver



Explanation:

Tin and Silver are malleable and good conductors of electricity. The other combinations have a non metal in them which are bad conductors.

Subject: Physics
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Q:

Which of these is not a simple machine?

A) a pair of scissors B) a lever
C) a ramp D) the pulley
 
Answer & Explanation Answer: A) a pair of scissors

Explanation:

Any of the basic mechanical devices for applying a force are called simple machines.

There are 6 basic simple machines; the lever, the wheel and axle, the inclined plane, the wedge, the pulley, and the screw. Several of these simple machines are related to each other. But, each has a specific purpose in the world of doing work.

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Q:

Long Sightedness means

A) near images are blurry B) far images are blurry
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) near images are blurry

Explanation:

Long sightedness is a common vision condition in which nearby objects are blurry.

 

In this situation, the person with this condition of the eye where the curvature of the cornea is flat or the axial length of the eyeball is short. When light enters the eye, it does not focus directly on the retina, but focuses beyond the retina. This causes near images to appear out of focus and blurred.

 long_sightedness_pic1532067577.jpg image

 

Long sightedness is also called hyperopia, and sometimes presbyopia.

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Q:

Sources of geothermal power are

A) water B) earth's heat
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

Geothermal power plants are used in order to generate electricity by the use of geothermal energy (the Earth's internal thermal energy). They essentially work the same as a coal or nuclear power plant, the main difference being the heat source.

geothermal_power1531899280.png image

Geothermal power plants use hydrothermal resources that have both water (hydro) and heat (thermal). Geothermal power plants require high-temperature (300°F to 700°F) hydrothermal resources that come from either dry steam wells or from hot water wells.

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Q:

what is the source of energy for the water cycle?

A) Rain water B) Sun
C) Clouds D) Animals
 
Answer & Explanation Answer: B) Sun

Explanation:

The water cycle is a term for the movement of water between the Earth's surface, the sky and underground. Water evaporates due to heat from the sun. Hence, the water cycle is driven primarily by the energy from the sun.

watercycle1531808968.gif image

This solar energy drives the cycle by evaporating water from the oceans, lakes, rivers, and even the soil. Other water moves from plants to the atmosphere through the process of transpiration.

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Q:

Second and third class levers are differentiated by

A) the location of the load B) the location of the fulcrum
C) the presence of multiple loads D) the type of fulcrum present
 
Answer & Explanation Answer: A) the location of the load

Explanation:
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Q:

Velocitation is the tendency to

A) be traveling at a speed that is faster than perceived B) be traveling at a speed that is slower than perceived
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) be traveling at a speed that is faster than perceived

Explanation:

Velocitation is a phenomenon caused by driving for long periods at high speeds. A driver may experience velocitation when coming off of the highway; the change in speed makes him or her think that the car is going much slower than it actually is.

 

Velocitation is the tendency to be traveling at a speed that is faster than perceived.

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Q:

Which has the lowest albedo?

A) dark surfaces B) light surfaces
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) dark surfaces

Explanation:

Albedo refers to a material's ability to reflect sunlight. Since 30% of the sun's energy is reflected by the entire earth, the earth has an average albedo of 0.30.

Generally, dark surfaces have a low albedo and light surfaces have a high albedo.

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Q:

Magnetic domains normally occur in

A) copper B) silver
C) iron D) All of the above
 
Answer & Explanation Answer: C) iron

Explanation:

A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction.

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