Tag: physics

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Questions Related to physics

Multiple choice physics energy management solar power plant production of electricity from solar energy solar equipment solar energy and its applications

Which of the following are macroscopic properties?

  1. texture

  2. phase

  3. viscosity

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

$Answer:-$ D

Macroscopic properties are qualities that can be seen by the naked eye, and some are relative to the conditions under which a material or element is observed. The three most basic examples of macroscopic properties are color, shape and size.

Other examples of macroscopic properties include texture, phase (solid, liquid or gas), viscosity (if any) and density relative to surroundings (such as oil on water). The properties of an element or material tend to change, even if only slightly, as the conditions change. Examples of changing conditions include how metals tend to glow red when heated to extreme temperatures, how the viscosity of honey decreases with temperature or how the volume of $H _2O$ increases slightly when it freezes.

Multiple choice physics energy production solar power plant production of electricity from solar energy solar equipment

Solar water heater can be used in hospitals for hot water supply.

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A.

Solar water heating is now a mature technology. Wide spread utilization of solar water heaters can reduce a significant portion of the conventional energy being used for heating water in homes, factories and other commercial and institutional establishments. 
Around 60 deg. 80 deg. C temperature can be attained depending on solar radiation, weather conditions and solar collector system efficiency
Hot water for homes, hostels, hotels, hospitals, restaurants, dairies, industries etc. It can be installed on roof-tops, building terrace and open ground where there is no shading, south orientation of collectors and over-head tank above SWH system.
Hence, the given statement is true.

Multiple choice physics energy production solar power plant production of electricity from solar energy solar equipment

Solar cell is a device which directly converts _______ into electric energy.

  1. heat energy

  2. mechanical energy

  3. chemical energy

  4. solar energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Solar cell is a device which directly converts solar energy into electric energy.
A solar cell, or photovoltaic cell, is an electrical device that converts the energy of light(sun)  directly into electricity by the photovoltaic effect. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light. Solar cells are the building blocks of photovoltaic modules, otherwise known as solar panels.

Multiple choice physics energy production solar power plant production of electricity from solar energy solar equipment

Solar panels can be used in electronic watches.

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The statement is true, with upcoming technologies there are solar panels present in watches and these use solar energy to power these watches and for night time there is a small rechargable battery inside the watch,which gets charged enough in day-or during sunlight to power the watch when sunlight is off.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Cilliary muscles in the eye:

  1. hold the eye lens in place

  2. increase or decrease focal length of eye lens.

  3. both (a) and (b)

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the ciliary muscle is relaxed, the choroid acts like a spring pulling on the lens via the zonule fibers causing the lens to become flat. When the ciliary muscle contracts, it stretches the choroid, releasing the tension on the lens and the lens becomes thicker. Cilliary muscles in the eye increase or decrease focal length of eye lens.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The nature of image formed on the retina of human eye is:

  1. virtual and erect

  2. virtual and inverted

  3. real and erect

  4. real and inverted
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Human eye lens are convex in nature and form real and inverted images and when the object is kept before the focus point and the centre of the lens it form virtual and erect images. The image formed on retina are real and inverted and further the message sent by the optic nerve are chemical impulses to the brain, which turn them into erect images that we see with our eyes.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Which of the following statements about human eye is NOT true?

  1. the iris gives a distinct colour to the eye

  2. the yellow spot is extremely sensitive to light

  3. the space between lens and cornea is filled with ciliary muscles

  4. the optic nerves enters the eye near the blind spot
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation


The space between the cornea and the lens is called the aqueous chamber and filled with thin watery transparent viscous fluid called aqueous humor which supplies nutrients to these structures as well as to the lens. Aqueous humour is produced by the ciliary processes in the posterior chamber and flows into the anterior chamber through the pupil.