Physics Questions

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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Q:

The p wave of a normal Electrocardiogram indicates

A) atrial depolarization B) Ventricular repolarization
C) atrial repolarization D) Ventricular depolarization
 
Answer & Explanation Answer: A) atrial depolarization

Explanation:

The P wave in the ECG represents atrial depolarization, which results in atrial contraction, or atrial systole.

The P wave is a summation wave generated by the depolarization front as it transits the atria.

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Q:

Gear finishing operation is called

A) Burnishing B) Hobbing
C) Shaping D) Milling
 
Answer & Explanation Answer: A) Burnishing

Explanation:

Gear finishing operation is called Burnishing.

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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:

The cover of a solar coker is made of glass because 

A) it absorbs sun's rays B) it reflects sun's rays
C) it retains the heat inside by the green house effect D) it rediates heat better than metals
 
Answer & Explanation Answer: C) it retains the heat inside by the green house effect

Explanation:

As the inside of the cooker is painted black, heat absorption is more producing heat waves of longer wavelength which cannot escape through glass and hence are trapped inside. Thus the food is cooked.

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Q:

Which of the following is an example of continous emission spectrum?

A) Spectrum of an oil frame B) Spectrum of a water
C) both D) none
 
Answer & Explanation Answer: A) Spectrum of an oil frame

Explanation:

Spectrum of an oil frame is an example for continuous emission spectrum

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Q:

Mirage is due to

A) Magnetic disturbances in the atmosphere B) Equal heating of different parts of the atmosphere
C) Unequal heating of different parts of the atmosphere D) Depletion of ozone layer in the atmosphere
 
Answer & Explanation Answer: C) Unequal heating of different parts of the atmosphere

Explanation:

Mirage_is_due_to1553078535.jpg image

Mirage is a naturally occurring optical phenomenon due to unequal heating of different parts of the atmosphere in which light rays bend to produce a displaced image of distant objects or the sky.

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Q:

What part of the atom has a positive charge?

A) Neutron B) Proton
C) Electron D) All the above
 
Answer & Explanation Answer: B) Proton

Explanation:

Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.

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