Physics Questions

Q:

Which statement best describes an igneous intrusion?

A) Igneous intrusion for when ice crystals splash into lava B) Magma is injected into surrounding rock forming an igneous intrusive
C) Magma is exported to an open area and forms iron D) Magma explodes to the surface and forms a smooth outer layer of rock
 
Answer & Explanation Answer: B) Magma is injected into surrounding rock forming an igneous intrusive

Explanation:

Magma is injected into surrounding rock forming an igneous intrusive.

 

Actually it is a plutonic formation in which magma present beneath Earth surface deforms the shape of rocks present above it
 

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Q:

Water is more dense than cooking oil.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Yes, the given statement that water is more dense than cooking oil is TRUE as water more denser than oil it is sinked when it is poured in oil.

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Q:

At the center of the sun, fusion converts hydrogen into

A) Helium B) Plutonium
C) Water D) Carbon
 
Answer & Explanation Answer: A) Helium

Explanation:

At the center of the sun, nuclear fusion converts hydrogen into helium, energy, and neutrinos. Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons).

At_the_center_of_the_sun,_fusion_converts_hydrogen_into1558676073.jpg image

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Q:

The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

A) Bernoulli's principle B) Magnetic properties of the ship's material
C) Newton's third law of motion D) Earth's gravitational force
 
Answer & Explanation Answer: A) Bernoulli's principle

Explanation:

The rapid flow of air between the two moving ships causes a reducton of pressure (Bernoulli's principle) , so they (the ships) are drawn closer together

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Q:

If the speed of an object moving along a straight line keeps changing, its motion is said to be _________.

A) Uniform B) Periodic
C) Circular D) Non-uniform
 
Answer & Explanation Answer: D) Non-uniform

Explanation:
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Q:

Which is evidence that supports the dynamo theory?

A) Earth's outer core contains liquid that conducts electricity B) Earth's core contains a large amount of iron
C) Granite and basalt conduct electricity D) Convection occurs in Earth's inner core
 
Answer & Explanation Answer: B) Earth's core contains a large amount of iron

Explanation:

In physics, the dynamo theory proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field.

Earth's crust core contains a large amount of iron and nickel is the evidence of the dynamo theory.

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Q:

A boy is swinging a ball attached to a string in a horizotal circle. If the string snaps 

A) the ball will travel towards the center of the circle and fall down B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
C) it will fall down at the same place where the string breaks D) None of these
 
Answer & Explanation Answer: B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down

Explanation:

The centripetal force having been removed the body cannot  execute the curved path

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Q:

The GPS device in an automobile uses which communication channel?

A) Satellite B) Microwave
C) Radio frequency D) Infrared
 
Answer & Explanation Answer: A) Satellite

Explanation:

All automobiles uses satellite communication channel for their GPS devices.

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