Tag: physics

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Questions Related to physics

Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

Which area on the Earth receives maximum sunlight ?

  1. Polar region

  2. Equatorial region

  3. Along the latitude of Tropic of Cancer

  4. Along the latitude of Tropic of Capricorn
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The Earth's shape is spherical. This causes the Sun's rays to strike the Earth's surface at different angles, creating variances in temperatures on Earth. The equator receives the most direct sunlight because sunlight arrives at a perpendicular (90 degrees) angle to the Earth.
Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

What is the basis for the formation of winds due to heating of different areas on Earth ?

  1. The air in cold temperature regions gets cooled, expands and becomes more dense and rises up. It's place is taken by heavier air from adjacent regions.

  2. The air in cold temperature regions gets cooled up, expands and becomes less dense and rises up. It's place is taken by heavier air from adjacent regions.

  3. The air in high temperature regions gets heated up, expands and becomes less dense and rises up. It's place is taken by heavier air from adjacent regions.

  4. The air in high temperature regions gets heated up, contracts and becomes more dense and rises up. It's place is taken by heavier air from adjacent regions.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In summer, near the equator the land warms up faster and most of the time the temperature of the land is higher than that of water in the oceans. The air over the land gets heated and rises. This causes the winds to flow from the oceans towards the land. And we know air expands on heating and and becomes less dense and therefore rises up.
Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

At poles, how is the direction of Polar winds ?

  1. Air from Polar region moves in towards the $60^o$ latitude belt

  2. Air from the $60^o$ latitude belt moves in towards Polar region

  3. Air from Polar region moves in towards the equatorial region

  4. Air from equatorial region moves in towards the Polar region
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
At the poles, the air is colder than that at latitudes about 60 degrees. The warm air at these latitudes rises up and the cold wind from the polar regions rushes in, to take its place.
Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

Arrange the following steps in the proper order to explain how a sea breeze occurs, near coastal regions.
(a) The temperature of land rises rapidly as compared to sea, because the specific heat capacity of land is five times less than that of water.
(b) Due to the low pressure over the land mass, the cool air over the sea starts blowing towards the land.
(c) The sun shines equally on the land mass and sea, giving equal amount of heat energy to both.
(d) The air above the land becomes hot and light, rises up and hence creates the low pressure over the land.

  1. a d c b

  2. c d a b

  3. c a b d

  4. c a d b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Near the coastal regions, when (c) the sun shines equally on the land mass as well as the sea giving an equal amount of heat energy.But (a) the temperature of land rises rapidly as compared to the sea water, as specific heat capacity of water is five times greater than that of land. So, water requires more heat energy to raises its temperature by $1^{\circ}C$. Then (d) the air above the land mass becomes hotter and lighter and hence rises up, which creates a low pressure over the land. (b) Due to the low pressure over the land mass, the cool air over the sea starts blowing towards the land, by this producing sea breeze.

Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

If an ideal flask containing hot coffee is shaken, the temperature on the coffee will:

  1. decrease

  2. increase

  3. remain same

  4. decrease if temperature is below $4$C and increase if temperature is equal to or more than $4$C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An ideal flask is designed to be thermally insulated, meaning no heat is exchanged with the surroundings. Shaking the coffee adds a negligible amount of mechanical energy, so the temperature remains effectively the same.

Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

State whether true or false.
The land and sea breezes are based on the fact that the specific heat of vaporisation of steam is very high.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The statement is true.
The specific heat capacity of water is much higher than that of sand. Air above land becomes more warmer than water during day. So cold air above water or sea blows to land known as sea breeze and vice versa for land breeze.
Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

A small weight put on the pressure cooker increased the pressure of steam because.

  1. Density of metal is very high

  2. Area of contact is very small

  3. It is air tight

  4. Pressure builds up irrespective of the weight placed
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressure is defined as force divided by area. By placing a weight on the pressure cooker's vent, the force is increased, and because the area of the vent is small, it significantly increases the pressure required for steam to escape.

Multiple choice wireless connections parts of computer physics

VOIP stands for ________________.

  1. Voice over IP

  2. Video over IP

  3. Viruses over IP

  4. Virtual over IP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

VOIP is an acronym for Voice over Internet Protocol, which is a technology that allows for voice communications and multimedia sessions over the Internet.

Multiple choice wireless connections parts of computer physics

In a ..................., a mobile station always communicates with just one base station. 

  1. Messaging hand off

  2. Hard hand off

  3. Soft hand off

  4. Roaming hand off
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a Hard hand off a mobile station always communicates with just one base station.

A hard handoff is a handoff technique used with cellular networks that requires the user's connection to be entirely broken with an existing base station before being switched to another base station. ... A hard handoff is also known as a hard handover or break-before-make handover.

 The handover or handoff process is of major importance within any cellular telecommunications network. It is necessary to ensure it can be performed reliably and without disruption to any calls.

SOft Handover:- When mobile ( in Call0 switches to a new sector/cell which is on the same frequency then it is called a soft handover. If the "new" sector is also from the same BTS then it is called a softer handover. UMTS networks omplements all types (Hard/Soft/Softer) of handovers.

Different approaches are proposed and applied in order to achieve better handoff service. The principal parameters used to evaluate handoff techniques are: forced termination probability and call blocking probability. ... Handoff (or handover) process is transferring an active call from one cell to another.