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 |
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The half life of radioactive elements is 600 yr the fraction of sample that would remain after 3000 yr is
 
1.  1/2
 
 
 
Subtopic:  Radioactivity |
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A particle moves along with x-axis. The position x os particles with respect to time t from origin given by x = b0 + b1t + b2t2. The acceletration of particle is
 
1.  b0
 
 
 

 

Subtopic:  Acceleration |
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Root mean square speed of the molecules of ideal gas is v. If pressure is increased two times at constant temperature, then the rms speed will become
 
1.  
 
 
 

 

Subtopic:  Types of Velocities |
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1 mol of gas occupies a volume of 200 mL at 100 mm pressure. What is the volume occupied by two moles of gas at 400 mm pressure and at same temperature?
 
1.  50 mL
 
 
 
Subtopic:  Ideal Gas Equation |
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A charged particle travels along a straight line with a speed v in a region where both electric foeld E and magnetic field B are present. If follows that
 
 
 
 

 

Subtopic:  Lorentz Force |
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What will be the wave velocity, if the radar gives 54 waves/min and wavelength of the given wave is 10 m?
 
1.  4 m/s
 
 
 

 

Subtopic:  Wave Motion |
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A transformer of 100% efficiency has 200 turns in the primary coil and 40000 turns in secondary coil. It is connected to a 220 V main supply and secondary feeds to a 100 kΩ resistance. The potential difference per turn is
 
1.  1.1 V
 
2.  25 V
 
3.  18 V
 
4.  11 V
Subtopic:  Transformer |
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A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens is completely immersed in a liquid of refractive index 1.6, its focal length will be
 
1.  -160 cm
 
2.  - 100 cm
 
3.  + 10 cm
 
4.  +100 cm
Subtopic:  Lens Makers' Formula |
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