Tag: structure of earth

Quizzes (7) Questions (80)

Questions Related to structure of earth

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

As the water is released through control valves, _____ of water changed to ____ .

  1. Rotational energy, potential energy

  2. Kinetic energy, potential energy

  3. Potential energy, rotational energy

  4. Rotational energy, thermal energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As the water is released through control valve, the potential energy of water changes to kinetic energy. As the water flows into reservoir from the catchment area, the kinetic energy of flowing water changes to potential energy.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is not a purpose to build dams?

  1. Prevent flooding of the rivers in the area.

  2. To prevent flooding of the rivers in the area.

  3. To generate hydroelectricity.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The dams are constructed for the following purposes:
a) To prevent flooding of the rivers in the area.
b) To provide water for irrigation purposes.
c) To generate hydroelectricity.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is not a disadvantage of building large dams?

  1. A vast variety of flora and fauna get submerged

  2. Dams can base dangers of earthquake

  3. Human settlement get submerged by stored water

  4. Provide water for irrigation process
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Providing water to irrigation process is an advantage of creating dam.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is an advantage of building dams?

  1. The dams disturbs aquatic life

  2. Dams lead go large scale disturbance of aquatic life

  3. It disturbs the natural ecosystem

  4. None
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The dams across the Rivers can disturb the aquatic life and can lead to their large scale destruction the fishes and other water animals may enter the power generation turbines where they may get crushed.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is not a disadvantage of building large dams for generating hydro electric power?

  1. Disturbance of the natural ecosystem in the surrounding forest area.

  2. Disruption of the plants and animals life.

  3. Displacement of people on a large scale.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The construction of dams for generating hydro electric power and then installation of transformers and their connection to the national grid has the following four main disadvantages:

A) Disturbance of the natural ecosystem in the surrounding forest area.

B) Disruption of the plants and animals life.

C) Displacement of people on a large scale.

D) Disruption of the aquatic ecosystem.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is / are disadvantage of building large dams for generating hydro electric power?

  1. Due to construction of dams, lot of areas of rivers having continuous fresh flowing water, have to be cleared.

  2. Number of trees have to be cut.

  3. Destroys not only the plants life but also the animals and birds life dependent on them.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The construction of dams for generating hydro electric power and then installation of transformers and their connection to the national grid has the following four main disadvantages:

A) disturbance of the natural ecosystem in the surrounding forest area.

B) disruption of the plants and animals life.

C) displacement of people on a large scale.

D) disruption of the aquatic ecosystem.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

At present, the contribution of hydroelectricity to the total power generation in India is

  1. A little more than $22$%

  2. A little more than $35$%

  3. A little more than $47$%

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydroelectricity typically accounts for about 10-12% of India's total power generation. The provided answer 'A little more than 22%' is likely outdated or refers to a different metric, but given the options, it is the standard choice in many older exam banks.

Multiple choice physics structure of earth electricity from water energy hydro electricity hydro energy

Fill in the blank space by choosing the correct word.
Water stored in the reservoirs of hydro-electric dams has ................. energy.

  1. $tidal$

  2. $fossil$

  3. $potential$

  4. $biomass$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Potential energy is stored energy or the energy of position. The potential energy stored in a body of water held at a given height is converted to kinetic energy (movement energy) which is used to turn a turbine and create electricity.
Hence, water stored in the reservoirs of hydro-electric dams has potential energy.

Multiple choice physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

Assertion : An earthquake will not cause uniform damage to all building in an affected area, even if they are built with the same strength and materials.
Reason : The one with its natural frequency close to the frequency of seismic wave is likely to be damaged less.

  1. If both assertion and reason are true and reason is the correct explanation of assertion.

  2. If both assertion and reason are true and reason is not the correct explanation of assertion.

  3. If assertion is true but reason is false.

  4. If both assertion and reason are false.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An earth quake will not cause uniform damage to all building in an affected area because the natural frequencies of a building depend on its height and other size parameters and the nature of building materials.
The one with its natural frequency close to the frequency of seismic wave is likely to be damaged more.

Multiple choice physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

An earthquake generates both transverse $(S)$ and longitudinal $(P)$ sound waves in the earth. The speed of $S$ waves is about $4 \,\,km \,\,s^{-1}$ and that of $P$ waves is about $8 \,\,km \,\,s^{-1}$. A seismograph records $P$ and $S$ waves from an earthquake.The first $P$ wave arrives $4$ min before the first $S$ wave. The epicentre of the earthquake is located at a distance of about

  1. $192 km$

  2. $384 km$

  3. $1920 km$

  4. $3840 km$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Let $\nu _1, \nu _2$ be speed $S$ of $S$ and $P$ waves and $t _1,t _2$ be the time taken by these waves to travel to reach the seismograph. Let the epicenter of the earthquake is located at a distance $d$ from the seismograph. Then,
$d = V _1 t _1 = V _2 t _2$          ................ .....(i)
Here, $V _1 = 4 km \,\,s^{-1}$ and $V _2 = 8 km \,\,s^{-1}$
$\therefore 4t _1 = 8t _2 \Longrightarrow t _1 = 2t _2$           ....(ii)
and  $t _1 - t _2 = 4 min = 240 s$
$\therefore 2t _2 - t _2 = 240$      ....................  [using (ii)]
or $t _2 = 240 s$
put in Eq. (ii), we get,
$t _1 = 2 \times 240 s = 480 s$
From Eq. (i), we get, $d = (4 km \,\,s^{-1}) (480 s) = 1920 km$