171. Oil spreads on water surface because-

1. Oil is denser than water
2. Oil is less dense than water
3. Surface tension of oil is more than water
4. Surface tension of oil is less than water

Option “4” is correct.
Oil spreads on water surface because the surface tension of oil is less than water.
172. A sudden fall in barometer reading indicates that the weather will be:

1. Stormy weather
2. Rainy weather
3. Cool dry weather
4. Hot and humid weather

Option “1” is correct.
A sudden fall in barometer reading indicates that the weather will be stormy.
173. The sun is visible to us a few minutes before the act sunrise because of:

1. Scattering of light
2. Diffraction of light
3. Total internal reflection of light
4. Refraction of light

Option “4” is correct.
Due to the refraction of light, the sun is visible to us a few minutes before sunrise and a few minutes after sunset.
174. The mirror used in motor vehicles to see the rear view is-

1. Biconcave
2. Convex
3. Plane
4. Concave

Option “2” is correct.
The convex mirror produces an upright image of any object and offers a wide viewing area as compared to the plane mirror. The usage of this type of mirror can be perceived on the car rear-view mirror.
175. The change of focal length of an eye lense is caused by action of the-

1. Pupil
2. Retina
3. Ciliary muscles
4. Iris

Option “3” is correct.
The eye lens is composed of a fibrous, jelly-like material. Its curvature can be modified to some extent by the ciliary muscles. The change in the curvature of the eye lens can thus change its focal length. When the muscles are relaxed, the lens becomes thin. Thus its focal length increases. This enables us to see distant objects clearly. When you are looking at objects closer to the eye, the ciliary muscles contract. This increases the curvature of the eye lens. The eye lens then becomes thicker. Consequently, the focal length of the eye lens decreases. This enables us to see nearby objects clearly.
176. The force which opposes the relative motion between different layers of liquid or gases is called-

1. Critical Velocity
2. Streamline Flow
3. Terminal Velocity
4. Viscous Force

Option “4” is correct.
The viscous force is the force between a body and a fluid (liquid or gas) moving past it, in a direction so as to oppose the flow of the fluid past the object.
177. Fathometer is used to measure:

1. Earthquake
2. Rain
3. Depth of sea
4. Sound intensity

Option “3” is correct.
Fathometer is an instrument used to determine the depth of water or a submerged object by means of ultrasound waves.
178. Which one of the following is the effect of the flight of supersonic jet?

1. Air pollution
2. Eye disease
3. Depletion in ozone layer
4. None of these

Option “3” is correct.
A jet engine is a machine for turning fuel into thrust. The thrust is produced by action and reaction also known as Newton’s third law of motion. Those jet planes which are able to fly faster than the speed of sound are called supersonic jet planes. Jet engines are responsible for depletion of ozone. Flying at stratosphere height, they emits nitrogen oxide which has the potential to destroy significant quantities of ozone in the stratosphere.
179. The incident ray, the _________ at the point of incidence and the reflected ray all lie in the same plane.

1. Surface
2. Tangent
3. Normal
4. Angle of reflection

Option “3” is correct.
The law of reflection states that the incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane.
180. Earth’s escape velocity is-

1. 15.0km/sec.
2. 21.1km/sec.
3. 7.0km/sec
4. 11.2km/sec

Option “4” is correct.
The escape velocity of earth is 11.2 km/sec.
Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

68 thoughts on “Physics”

  8. Dolly.

    Hi I’m dolly..
    Jo bhi lok ye app download krk pdhai krr kre hai vo unka future boht hi jyada bright hone vala hai.. because baat free off cost prhne ki nahi hai,baat kaise study krne ki hai…fhir chahe vo jaise bhi ho…main sbko bss itna hi kehna chahti hu ke boh ache se iss app ka use kro and kisi bhi competitive exam ke liye ye app boht acha hai…and please comment jrur chod ke jna .. thank you

  10. lista escape roomów

    hey there and thank you for your info – I’ve certainly picked up something
    new from right here. I did however expertise several technical points using this website, as I experienced
    to reload the website lots of times previous to I could
    get it to load correctly. I had been wondering if your hosting is OK?
    Not that I am complaining, but sluggish loading instances times will very frequently affect your
    placement in google and can damage your high quality score if advertising and marketing
    with Adwords. Anyway I am adding this RSS to my e-mail and can look out for much more of your respective intriguing content.
    Make sure you update this again soon.. Escape rooms hub

  52. JamesHat

    ¡Saludos, apostadores entusiastas !
    casinosextranjero.es – juega desde el extranjero – п»їhttps://casinosextranjero.es/ п»їcasinos online extranjeros
    ¡Que vivas increíbles recompensas sorprendentes !

  54. quantkiolanthe

    Why It’s Collectable Tudor quietly dabbles in link making watches with logo-dialed watches for companies. These Air France editions are two of only a handful and they’re executed very well. It’s not a very “Rolex” practice to create limited editions today but Tudor has been active in this space making these watches highly sought-after by collectors.

  55. ramyadvictoria

    Malaika My style is 50 percent girl in link her late teens trying to get into a bar 25 percent eight-year-old boy in overalls 25 percent aspirational adult. Style-wise this is the watch for the adult in me.

  57. thadeawbonnie

    Believe it or not there is a method to the madness of this column link and the ordering of every week’s picks factors into it. Sometimes it’s fun to build up to something big and sign off for the week with a bang but other times the proverbial big kahuna is so good that you can’t help but spill the beans early. This week I thought I’d come right out of the gate with what’s undoubtedly one of the most impressive watches to be offered this year. And no it’s not a Rolex or a Patek.

  58. alysaxhadley

    All of a sudden everybody knows what a Crash is and slowly people are learning about other B-side hits from link the watchmaker of shapes. “The entire Cartier vintage history is so ripe for the plucking” watch dealer and Internet personality Mike Nouveau astutely pointed out. “There’s so much cool stuff to pick from their back catalog that they maybe made 10 of and that’s it.”

  63. Kennethdyeta

    ¡Saludos, exploradores de la fortuna !
    Casinos extranjeros con bonos sin depГіsito inicial – п»їhttps://casinoextranjerosdeespana.es/ casino online extranjero
    ¡Que experimentes maravillosas premios excepcionales !

  64. Waltersoaxy

    Hello keepers of pristine spaces !
    Best Air Purifier for Smoke Large Rooms – Top 10 List – п»їhttps://bestairpurifierforcigarettesmoke.guru/ air purifier for smoke smell
    May you experience remarkable magnificent freshness !

  67. DanielSlUrf

    ¡Saludos, buscadores de tesoros escondidos !
    Casino sin licencia EspaГ±a con privacidad total – п»їemausong.es mejores casinos sin licencia en espaГ±a
    ¡Que disfrutes de increíbles giros exitosos !

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top