In air, the value of the total electric flux emitted from unit positive charge is   1.  ε0 2.  (ε0)-1 3.  (4πε0)-1 4.  4πε0

Subtopic:  Gauss's Law |
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A rod AB is 1 m long. The temperature of its one end A is maintained at 100 °C and other end B at 10 °C, the temperature at a distance of 60 cm from point B is
1.  64 °C
2.  36 °C
3.  46 °C
4.  72 °C

Subtopic:  Conduction |
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In designing, a beam for its use to support a lead. The depression at centre is proportional to (where, Yis Young’s modulus)

1.  Y2

Subtopic:  Elasticity |
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A balloon is filled at 27 °C and 1 atm pressure by 500 m3. He, At -3 °C and 0.5 atm pressure, the volume of He will be

1.  700 m3

Subtopic:  Ideal Gas Equation |
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The particle of mass 50 kg is at rest. The work done to accelerates it by 20 m/s in 10 s is

1.  103 J

Subtopic:  Concept of Work |
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The moment of inertia of a circular loop of radius R, at a distance of R/2 around a rotating axis parallel to horizontal diameter of loop is

1.  MR2

Subtopic:  Moment of Inertia |
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The ratio of radius of two bubbles is 2: 1. What is the ratio excess pressure inside them?

1.  1: 2

Subtopic:  Surface Tension |
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In the capacitor of capacitance C, charge Q and energy W is stored. If charge is increases upto 2Q, the energy stored will be

1.

Subtopic:  Energy stored in Capacitor |
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The unit of thermal conductivity is

1.  Wm-1K-1

Subtopic:  Conduction |
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Photon and electron are given same energy (10‑20J). Wavelength associated with photon and electron are λp and λe, the correct statement will be

Subtopic:  De-broglie Wavelength |