GK Questions: General Science(Physics) – Set 4

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1. The normal temperature of human body is ………………….
   1.73⁰C
   2.30⁰C
   3.37⁰C
   4.100⁰C
   5.None of these
   
   Answer & Explanation

   Answer –3.37⁰C
   Explanation :
   Normal body temperature as an oral temperature of 98.6°F (37°C). This is an average of normal body temperatures.
   
   
   
2. Density of water is maximum at ………………………..
   1.7⁰C
   2.3⁰C
   3.4⁰C
   4.2⁰C
   5.None of these
   
   Answer & Explanation

   Answer –3.4⁰C
   Explanation :
   Density of a substance is defined as the ratio of its mass to its volume
   Unit = kg/m³
   
   
   
3. What is the SI unit of pressure ?
   1.N/sm²
   2.N/m²
   3.kg/m²
   4.N/m³
   5.None of these
   
   Answer & Explanation

   Answer – 2.N/m²
   Explanation :
   Pressure is defined as the force acting normally on unit area of the surface
   Unit = N/m²  or Pascal.A tmospheric pressure is measured by Barometer
   
   
   
4. Slow fall in barometric reading is the indication of ……….
   1.Rain
   2.Storm
   3.Clear Weather
   4.Normal Weather
   5.None of these
   
   Answer & Explanation

   Answer –1.Rain
   Explanation :
   The slow fall in barometric reading is the indication of rain
   The slow rise in barometric reading is the indication of clear weather
   The sudden fall in barometric reading is the indication of storm
   
   
   
5. The angle of contact is …………. for pure water and clean glass
   1.60⁰
   2.45⁰
   3.90⁰
   4.0⁰
   5.None of these
   
   Answer & Explanation

   Answer –4.0⁰
   Explanation :
   The angle of contact is 0⁰ for pure water and clean glass. It is 90⁰ for silver, 8⁰
   for ordinary water and 135⁰ for mercury
   
   
   
6. Which does not require the medium for their propagation ?
   1.Electromagnetic waves
   2.Transverse Waves
   3.Longitudinal Waves
   4.Mechanical Waves
   5.None of these
   
   Answer & Explanation

   Answer –1.Electromagnetic waves
   Explanation :
   Electromagnetic waves do not require medium for their propagation.
   Ex – Cathode rays, Alpha and Beta rays
   
   
   
7. Which require the medium for their propagation ?
   1.Electromagnetic waves
   2.Sound waves
   3.Mechanical Waves
   4.Shock waves
   5.Both 1 and 2
   
   Answer & Explanation

   Answer – 5.Both 1 and 2
   Explanation :
   Mechanical Waves require the medium for their propagation. These are 2 types.They are Longitudinal and Transverse waves
   
   
   
8. The speed of Supersonic wave is measured in ………………….
   1.Avogadrao Number
   2.Energy
   3.Mach Number
   4.Wavelength
   5.None of these
   
   Answer & Explanation

   Answer –3.Mach Number
   Explanation :
   Mach number is the ratio of speed of source to the speed of sound
   Mach number >1- Supersonic
   Mach number >5- Hypersonic
   Mach number <1 – Body is moving with supersonic
   
   
   
9. Pyrometer can’t measure the temperature below …………………
   1.800 ⁰C
   2.500 ⁰C
   3.1000 ⁰C
   4.750 ⁰C
   5.None of these
   
   Answer & Explanation

   Answer – 1.800 ⁰C
   Explanation :
   Pyrometer measure the temperature of a body by measuring the radiation emitted by the body.It can’t measure the temperature below 800 ⁰C
   
   
   
10. Freezing point of Mercury is………………………….
    1.-21⁰C
    2.-39⁰C
    3.-19⁰C
    4.39⁰C
    5.None of these
    
    Answer & Explanation

    Answer –2.-39⁰C
    Explanation :
    Freezing point of Mercury is 39⁰C.To measure the temperature below -39⁰C alcohol thermometer is used. Freezing point of alcohol is -114⁰C