GK Questions: General Science(Physics) – Set 11

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1. Sound can’t pass through ………………..
   1.Gas
   2.Vaccum
   3.Liquid
   4.Solid
   5.None of these
   
   Answer & Explanation

   Answer – 2.Vaccum
   Explanation :
   Sound cannot travel through vaccum because there is no air molecules to vibrate sound
   
   
   
2. The dimension of which of the following is same as that of Impulse ?
   1.Velocity
   2.Acceleration
   3.Momentum
   4.Angular Velocity
   5.None of these
   
   Answer & Explanation

   Answer – 3.Momentum
   Explanation :
   Impulse has the same units and dimensions (M L T⁻¹) as momentum. In the International System of Units, these are kg·m/s = N·s.
   
   
   
3. The strongest Force in nature is ……………….
   1.Electromagnetic Force
   2.Gravitational Force
   3.Magnetic Force
   4.Nuclear Force
   5.None of these
   
   Answer & Explanation

   Answer – 4.Nuclear Force
   Explanation :
   Strongest Force – Nuclear Force
   Weakest Force – Gravitational Force
   
   
   
4. An image formed on the Retina of an eye persists for about ……………………. after the removal of stimulus
   1.0.1s
   2.0.001s
   3.0.10s
   4.0.0001s
   5.None of these
   
   Answer & Explanation

   Answer – 1.0.1s
   Explanation :
   An image formed on the Retina of an eye persists for about 0.1s after the removal of stimulus
   
   
   
5. Lens is made up of which type of glass ?
   1.Pyrex Glass
   2.Flint Glass
   3.Lead Crystal Glass
   4.Laminated Glass
   5.None of these
   
   Answer & Explanation

   Answer – 2.Flint Glass
   Explanation :
   The currently known flint glasses have refractive indices ranging between 1.45 and 2.00. A concave lens of flint glass is commonly combined with a convex lens
   
   
   
6. Magnetism at the centre of the bar magnet is ……………………..
   1.Infinite
   2.Minimum
   3.Zero
   4.Maximum
   5.None of these
   
   Answer & Explanation

   Answer – 3.Zero
   Explanation :
   The density of the field lines on the picture is maximized at the “poles” of the bar magnet and minimized at the center
   
   
   
7. 1 kcal = ?
   1.1000 cal
   2.100 cal
   3.1200 cal
   4.4.18 joule
   5.None of these
   
   Answer & Explanation

   Answer – 1.1000 cal
   Explanation :
   1 kcal = 1000 cal
   
   
   
8. A sunset and sunrises arises due to …………………
   1.Total Internal Reflection
   2.Scattering
   3.Reflection
   4.Refraction
   5.None of these
   
   Answer & Explanation

   Answer – 3.Reflection
   Explanation :
   The sunlight takes on an orange or red cast, which we can see reflected from clouds or other objects as a colorful sunset (or sunrise).
   
   
   
9. The Voltage in a motor car battery is
   1.18V
   2.20V
   3.12V
   4.10V
   5.None of these
   
   Answer & Explanation

   Answer – 3.12V
   Explanation :
   Most lead acid batteries that cars use is of 12V(12.6V to be precise, 2.1V per cell
   
   
   
10. The sound produced by the bat is
    1.Supersonic
    2.Ultarsonic
    3.Infrasonic
    4.Ultrsound
    5.None of these
    
    Answer & Explanation

    Answer – 2.Ultarsonic
    Explanation :
    Humans can only hear sound up to about 16KHz (that’s 16,000 cycles per second). Bats emit sounds at typically 2 or 3 times higher pitch than we can hear.