Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

Multiple choice physics lens technical terms related to lens terms related to lenses introduction to lenses and its types

A convex and a concave lens separated by distance $d$ are then put in contact. The focal length of the combination

  1. Decreases

  2. Increases

  3. Becomes $0$

  4. Remains the same
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\dfrac{1}{f _r}=\dfrac{1}{f _1}+\dfrac{1}{f _2}-\dfrac{d}{f _1f _2}$

So when are brought in contact $d=0$, hence focal length $f _r$ will decrease .

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

Energy potential from various sources of sea is ____. Efficient commercial exploitation of same is _______.

  1. Small, difficult

  2. Large, difficult

  3. Small, easy

  4. Large, easy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The energy potential from the sea (tidal energy, wave energy and ocean thermal energy) is quite large, but efficient commercial exploitation is difficult.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

Full form of OCTEC is:

  1. Ocean Thermal Energy Conversion Power Plant.

  2. Ocean Thermal Consumer Energy Power Plant.

  3. Ocean Current Thermal Energy Cycle.

  4. Ocean Current Thermal Electric Plant.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

OCTEC stands for ocean thermal energy conversion power plant. It is a device used to harness tidal energy to produce electricity.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

Rise of ocean level is called ________ and fall of ocean level is called ________

  1. high wave, low wave

  2. low wave, high wave

  3. high tide, low tide

  4. low tide, high tide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tide  are the rise and fall of sea levels caused by the combined effects of gravitational forces exerted by the Moon, Sun and rotation of the Earth. The effect of moon is most prominent among all the factors. Rise of ocean level is called high tide and fall of ocean level is called low tide.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

If ocean thermal energy is made feasible and cheaper, it has tremendous potential because:

  1. Potential energy in oceans is immense

  2. Ocean waves are very strong

  3. Most of the solar energy is incident on the ocean surface

  4. A lot of heat energy is trapped in the land mass below the oceans
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$71 \%$ of the Earth's surface is covered by oceans. Hence, most of the solar energy is absorbed by the oceans. This energy can be harnessed using OCTEC. Hence, ocean thermal energy has great potential.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

From below which is the type of energy from sea?

  1. Tidal Energy

  2. Wave Energy

  3. Ocean Thermal Energy

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

Energy from the sea can be classified into three types:

1. Tidal energy - This energy is harnessed by building a dam and placing a turbine near the opening of the dam. By using the turbine, tidal energy of the sea is used to produce electricity.
2. Wave energy - Kinetic energy of the wave is used in generation of electricity.
3. Ocean thermal energy - Thermal difference between the cold ocean water and warm tropical surface water is used to generate electricity.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

What is known as Ocean thermal energy?

  1. The Sun's heat warms the surface water a lot more than the deep ocean water which creates ocean's naturally available temperature gradient.

  2. The Moon's heat warms the surface water a lot more than the deep ocean water which creates ocean's naturally available temperature gradient.

  3. The Solar cell's heat warms the surface water a lot more than the deep ocean water which creates ocean's naturally available temperature gradient.

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

Temperature gradient of the water with deep ocean being cold and tropical surface water being warm due to the Sun's heat is the ocean thermal energy.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

What are built near seashores to collect water which comes during high tide?

  1. Dams or reservoirs

  2. Solar panel

  3. Wind mill

  4. Water well
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dams or reservoirs are usually build near the narrow opening of the seashores to harness the energy of the waves during high tide in generation of electricity.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

Waves are used to rotate ____________ to generate electricity. Fill in the gap.

  1. Rotor of Dynamo

  2. Turbine of dam

  3. Wheel of wind mill

  4. Armature of motor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Waves are made to fall from a height on to the rotor of a turbine or dynamo to make them rotate. This mechanical energy is then converted to electrical energy.

Multiple choice physics sources of energy wave energy tidal energy wave power and tidal power

The two different ways of harnessing energy from ocean are :

  1. Tidal Wave, OTEC

  2. Geothermal, wave energy device

  3. Solar energy, point wave absorber

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

The two different ways of harnessing energy from ocean is Tidal wave and Ocean Thermal Energy Conversion (OTEC).
Answer (A) Tidal Wave, OTEC