For a thermocouple the temperature of cold junction (Tc), neutral temperature (Tn) and temperature of inversion (Ti) are 00C, 2850C respectively. If the temperature of cold junction is raised to 100C, then:

1.  Tn = 2750C and Ti = 5700C

2.  Tn = 2750C and Ti = 5600C

3.  Tn = 2850C and Ti = 5600C

4.  Tn = 2950C and Ti = 5800C

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4
Correct Answer :

Tn = 2850C and Ti = 5600C


Explanation :
No Explanation available for this question

A wire of length 6.28 m is bent into a circular coil of 2 turns. If a current of 0.5 A exists in the coil, the magnetic moment of the coil is, in A-m2:

1.  π/4

2.  1/4

3.  π

4.  4π

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4
Correct Answer :

π/4


Explanation :
No Explanation available for this question

A metal rod of length 2 m is rotating with an angular velocity of 100 radians/sec in a plane perpendicular to a uniform magnetic field of 0.3T. The potential difference between the ends of rod is:

1.  30 V

2.  40 V

3.  60 V

4.  600 v

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4
Correct Answer :

60 V


Explanation :
No Explanation available for this question

The threshold frequency of the metal of the cathode in a photoelectric cell is 1 x 106 Hz. When a certain beam of light is incident on the cathode, it is found that a stopping potential '4.144 V' is required to reduce the current to zero. The frequency of the incident radiation is: (h = 6.63 x 10-34 J-s)

1.  2.5 x 1015 Hz

2.  2 x 1015 Hz

3.  4.144 x 1015 Hz

4.  3 x 1016 Hz

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4
Correct Answer :

2 x 10<sup>15</sup> Hz


Explanation :
No Explanation available for this question

The surface of a metal has a work function 2.66 0V. This is illuminated with photons of wavelength 450 nm. The de-Broglie wavelength of the emitted photoelectrons is: (Mass of electron = 9 x 10-31 Kg)

1.  2.045 x 10-9 m

2.  4.09 x 10-9 m

3.  8.18 x 10-9 m

4.  1.02 x 10-9 m

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4
Correct Answer :

4.09 x 10<sup>-9</sup> m


Explanation :
No Explanation available for this question

If 200 MeV of energy is released in the fission of 1 nucleus of 92U235, the number of nuclei that undergo fission to produce energy of 10 Kwh in one second:

1.  11.25 x 1018

2.  22.5 x 1017

3.  11.25 x 1017

4.  22.5 x 1018

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4
Correct Answer :

11.25 x 10<sup>17</sup>


Explanation :
No Explanation available for this question

A water film is formed on a glass-block. A light ray is incident on water film from air at an angle 600 with the normal. The angle of incidence on glass slab is.

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

A zener diode voltage regulator operated in the range 120-180 V produces a constant supply of 110 V and 250 mA to the load. If the maximum current is to be equally shared between the load and zener. Then the values of series resistance (Rs) and load resistance (RL) are :

1.  RL = 70 Ω; RS =280 Ω

2.  RL = 440 Ω; RS =140 Ω

3.  RL = 140 Ω; RS =440 Ω

4.  RL = 280 Ω; RS =70 Ω

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4
Correct Answer :

RL = 440 Ω; RS =140 Ω


Explanation :
No Explanation available for this question

Two deuteformed will berium nuclei each of mass 'm’ fuse together to form a Helium nucleus, releasing an energyE. If ’e’ is the velocity of light, the mass of Helium nucleus formed will be :

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

When a light of photons of energy 4.2eV is incident on a metallic sphere of radius 10 c and work function 2.4eV, photo electrons are emitted. The number of photo electrons liberated before the emission is stopped, is

1.  6.25x108

2.  1.25x109

3.  1.25x108

4.  6.25x1018

View Answer  
4
Correct Answer :

1.25x108


Explanation :
No Explanation available for this question
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