71. AV= constant, where A= area of cross-section and V= velocity of fluid. This equation is called _____.

1. Equation of discontinuity
2. Equation of continuity
3. Equation of sustenance
4. Equation of parallelism

Option “2” is correct.
According to the equation of continuity Av = constant. Where A =cross-sectional area and v=velocity with which the fluid flows. It means that if any liquid is flowing in streamline flow in a pipe of non-uniform cross-section area, then rate of flow of liquid across any cross-section remains constant.
72. A body in equilibrium _______.

1. Can move with constant acceleration
2. Is always at rest
3. Can move with constant velocity
4. Can move with variable acceleration

Option “3” is correct.
A body which is in equilibrium is either moving at constant velocity in a straight line, or it is not moving.
73. What is the viscosity of an ideal fluid?

1. Equal to its mass
2. Equal to its weight
3. Zero
4. One

Option “3” is correct.
The viscosity of an ideal fluid is Zero.
74. A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because –

1. Stone is heavier than parachute
2. Special mechanisms are present in parachute
3. A parachute has a larger surface area and air resistance is more
4. None of the above

Option “3” is correct.
A parachute descends slowly because it has a larger surfaace area and air resistance is more.
75. Shaving mirror is –

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

Option “2” is correct.
Concave mirror is used as Shaving mirror.
76. Moving Electric Charge produces –

1. Magnetic field
2. Sound waves
3. Light rays
4. Heat waves

Option “1” is correct.
A charged particle moving without acceleration produces an electric as well as a magnetic field.
77. Kerosene rises in the wick of the stove is due to –

1. Osmosis
2. Diffusion
3. Surface tension
4. Biogen contraction

Option “3” is correct.
Kerosene oil rising in the wick of the stove is due to the surface tension of oil. The wick of the lamp has many holes which act as capillaries. So kerosene keeps on rising in the capillaries.
78. The reason of mirage is-

1. Interference of light
2. Diffraction of light
3. Polarization of light
4. Total internal reflection of light

Option “4” is correct.
The mirage is caused by the Total internal reflection of light at layers of air of different densities.
79. Red light is used in traffic signals because-

1. It has the longest wavelength
2. It is beautiful
3. It is visible to people even with bad eyesight
4. None of the above reasons

Option “1” is correct.
The wavelength of red colour is highest while of violet colour is lowest. Dispersal is inverse to wavelength so it is seen more clear. That’s why the red colour is used in traffic.
80. If Va, Vw and Vs respectively are the speed of sound in air, water and steel, then-

1. Va < Vw < Vs
2. Vs < Vw < Va
3. Vw < Vs < Va
4. Vs < Va < Vw

Option “1” is correct.
As we know that the speed of sound is different for different types of medium. In general, sound travels faster in liquids than gases and faster in solids than in liquids.

68 thoughts on “Physics”

  1. 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

  2. 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

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

  4. 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.

  5. 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.

  6. 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.

  7. 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.”

  8. 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 !

  9. 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 !

  10. ¡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