Physics Questions

Q:

Contact force is another name for _________.

A) Friction B) Magnetic force
C) Electrostatic force D) Muscular force
 
Answer & Explanation Answer: D) Muscular force

Explanation:
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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:

Heat transfer by conduction occurs when molecules

A) Collide B) Combine
C) Heated D) None of the above
 
Answer & Explanation Answer: A) Collide

Explanation:

Conduction is the movement of heat through a substance by the collision of molecules. It occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature.

Heat_transfer_by_conduction_occurs_when_molecules1560488148.jpg image

 

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Q:

Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?

A) 200 nm and 500 nm B) 500 nm and 1000 nm
C) 500 nm only D) 200 nm and 1000 nm
 
Answer & Explanation Answer: C) 500 nm only

Explanation:
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.
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Q:

Heat energy is transferred by conduction whenever molecules

A) collide each other B) means of photons
C) particles replaces there places D) All of the above
 
Answer & Explanation Answer: A) collide each other

Explanation:

Heat energy can be transferred by three major methods. They are 

 

1. Conduction,

2. Convection and

3. Radiation.

 

Conduction is the movement of heat through a substance by the collision of molecules

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy.

Radiation is the transfer of energy by means of photons in electromagnetic waves governed by the same laws. It occurs through a vacuum or any transparent medium.

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Q:

In beta decay what is emitted

A) electron B) proton
C) neutron D) All of the above
 
Answer & Explanation Answer: A) electron

Explanation:
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Q:

Which of the following is a renewable source of energy

A) Natural gas B) Coal
C) Wind D) Oil
 
Answer & Explanation Answer: C) Wind

Explanation:

The energy sources that are constantly being replenished, such as sunlight, wind, and water. This means that we can use them as much as we want, and we do not have to worry about them running out. Additionally, renewable energy sources are usually much more environmentally friendly than fossil fuels. Overall, they release very few chemicals, like carbon dioxide, that can harm the environment.


Most of this energy comes from fossil fuels, such as coal, oil, and natural gas. These are nonrenewable energy sources, which means that if we use them all up, we can never get more during our lifetime. Fossil fuels also contribute greatly to global climate change by releasing carbon dioxide into the air when they are burned.

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Q:

which is a best way to measure Ground Distance?

Answer

Pace Count is a way to measure to Ground Distance.


Pace Count is nothing but regular single natural step of about 30 inches long.

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