Tag: physics

Questions Related to physics

Which area on the Earth receives maximum sunlight ?

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

  1. Polar region

  2. Equatorial region

  3. Along the latitude of Tropic of Cancer

  4. Along the latitude of Tropic of Capricorn

Show answer
Correct Option: B
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.

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

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

  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.

Show answer
Correct Option: C
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.

At poles, how is the direction of Polar winds ?

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

  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

Show answer
Correct Option: A
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.

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.

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

  1. a d c b

  2. c d a b

  3. c a b d

  4. c a d b

Show answer
Correct Option: D
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.

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

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

  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

Show answer
Correct Option: C

Sea breeze and land breeze

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

  1. are caused by currents set up in air due to conduction

  2. are caused by currents set up in air due to convection

  3. are caused by currents set up in air due to radiation

  4. have no relation to conduction, convection and radiation

Show answer
Correct Option: A

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.

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

  1. True

  2. False

Show answer
Correct Option: A
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.

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

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  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

Show answer
Correct Option: B

VOIP stands for ________________.

wireless connections parts of computer physics

  1. Voice over IP

  2. Video over IP

  3. Viruses over IP

  4. Virtual over IP

Show answer
Correct Option: A

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

wireless connections parts of computer physics

  1. Messaging hand off

  2. Hard hand off

  3. Soft hand off

  4. Roaming hand off

Show answer
Correct Option: B
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.