5
Q:

How long would it take to travel 4 light years? 

Answer:



Q:

Speed of sound is maximum in which among the following?

A) Gases B) Vaccum
C) Liquids D) Solids
 
Answer & Explanation Answer: D) Solids

Explanation:

We know that, in solids all the particles are packed together and hence sound can travel from one to one very fast.

 

Hence, speed of sound is maximum in solids and decreses from solids to liquids and liquids to gases. Sound can't travel through vaccum.

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Q:

What is another name for energy of motion?

A) Motional energy B) Potential energy
C) Kinetic energy D) Rotational energy
 
Answer & Explanation Answer: C) Kinetic energy

Explanation:

Every object has two typea of energies. They are ::

Potential energy

Kinetic energy

 

If the object is in motion, then it has Kinetic energy (KE). Potential energy (PE) is energy that is "stored" because of the position and/or arrangement of the object.

 

Hence, another name for energy of motion is called Kinetic energy.

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0 155
Q:

Which resource is both renewable and inexpensive?

A) Sunlight B) Coal
C) Gold D) Minerals
 
Answer & Explanation Answer: A) Sunlight

Explanation:

A resource is a source or supply from which a benefit is produced. Resources can be broadly classified upon their availability they are renewable and non renewable resources.

 

Renewable Resources :: A resource that can be replenished after use are known as Renewable resources.

Examples :: Sunlight, Water, biomass,...

 

Non renewable Resources :: A resource that, once used, is no longer available are known as Non renewable Resources. 

Example :: Coal, fossil fuels, natural gas,...

 

Sunlight is the both renewable and inexpensive resource from the given options.

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Q:

The stability triangle is used to describe

Answer

The stability triangle is used to describe the movement of center of gravity of a load vehicle like trucks. If the load is not balanced then it moves and may tip over it.


 


                                         the_stability_triangle_is_used_to_describe1533620821.jpg image


 


If you were to raise a lift truck up and look at its underside, you would see that the support points for the truck are located at points A, B, and C. The triangle formed between points A, B, and C is called the Stability Triangle. The lift truck will not tip over as long as the center of gravity remains inside the triangle.


 


The center of gravity is the point within a lift truck where there is equal weight all around it.

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1 105
Q:

Magnetic field lines about a current-carrying wire

A) circle the wire in closed loops B) extend radially from the wire
C) both of these D) None of the above
 
Answer & Explanation Answer: A) circle the wire in closed loops

Explanation:

Electric current produces a magnetic field. This magnetic field can be visualized as a pattern of circular field lines surrounding a wire.

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1 358
Q:

Which metal is the best conductor of heat?

A) Silver B) Gold
C) Copper D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Silver is the best conductor of both heat and electricity among metals with a thermal conduction value of about 430 W/(mK).

Gold and copper both come respectably close to silver.

 

Copper being significantly less costly it is often chosen over silver in many applications.

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4 260
Q:

The strength of an electromagnet can be increased by

A) increasing the length of the coiled wire B) increasing current supply
C) increasing the number of turns D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

The strength of an electromagnet can be increased by increasing the cross-sectional area, increasing the number of turns, increasing current supply, increasing the length of the coiled wire.

 

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1 231
Q:

Middle latitude cyclones are fueled by? 

A) air high in the atmosphere B) polar continental air masses
C) energy from falling precipitation D) All of the above
 
Answer & Explanation Answer: A) air high in the atmosphere

Explanation:

Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are low-pressure areas which, along with the anticyclones of high-pressure areas, drive the weather over much of the Earth.

 

Middle latitude cyclones are fueled by air high in the atmosphere.

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