Maximum emf generated in a generator is:
Maximum emf generated in a generator is:
εo =NωAB | |
ε = εosinθ | |
εo =NωABsinθ | |
εo = εsinθ |
Physics MCQS
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By mass spectrograph we can find the value of mass by using formula:
By mass spectrograph we can find the value of mass by using formula:
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![m=[(er^2)/2V]](https://fgstudy.com/quiz/images_mcqs/12th/phy/12th-Physics-PP-LB-2019-G2-005-005.png)
![m=[(eV^2)/2r]](https://fgstudy.com/quiz/images_mcqs/12th/phy/12th-Physics-PP-LB-2019-G2-005-004.png)
The value of charge on 1.0 x 10<sup>7</sup> electrons is:
The value of charge on 1.0 x 107 electrons is:
1.6 x 10-12 C | |
1.6 x 10+19 C | |
1.6 x 10-11 C | |
1.6 x 10-19 C |
The life time of an electron in an excited state is about 10 <sup>-8</sup>s. What is its uncertinty in energy during this time:
The life time of an electron in an excited state is about 10 -8s. What is its uncertinty in energy during this time:
7.2 x 10-15 J | |
9.1 x 10-31 J | |
6.63 x 10-34 J | |
1.05 x 10-26 J |
At what frequency will an inductor of 1.0 H have a reactance of 500Ω
At what frequency will an inductor of 1.0 H have a reactance of 500Ω
80 Hz | |
1000 Hz | |
50 Hz | |
500 Hz |
The most suitable metal for making permanent magnet is:
The most suitable metal for making permanent magnet is:
Iron | |
Copper | |
Aluminium | |
Steel |
Domains are existed in:
Domains are existed in:
Paramagnetic materials | |
Diamagnetic materials | |
Semi-conductors | |
Ferromagnetic materials |
Which of the following has least hysteresis loop area:
Which of the following has least hysteresis loop area:
Wrought iron | |
Soft iron | |
Steel | |
Lobalt |
A solid having regular arrangement of molecules throughout its structure is called:
A solid having regular arrangement of molecules throughout its structure is called:
Polymeric solid | |
Crystalline solid | |
Amorphous solid | |
Glassy solid |
Soft magnetic material is:
Soft magnetic material is:
Sodium | |
Steel | |
Copper | |
Iron |
Above the curie temperature iron is:
Above the curie temperature iron is:
Ferromagnetic | |
Paramagnetic | |
Diamagnetic | |
Not effected |
The substance in which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called:
The substance in which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called:
Paramagnetic | |
Non-magnetic | |
Ferromagnetic | |
Diamagnetic |
Curie temperature iron is about:
Curie temperature iron is about:
0 K | |
378 K | |
1023 K | |
750 K |
Curie temperature for iron is:
Curie temperature for iron is:
780oC | |
730oC | |
710oC | |
750oC |
After curie temperature, iron is:
After curie temperature, iron is:
Diamagnetic | |
Ferromagnetic | |
Paramagnetic | |
Magnetic |
A single domain in ferromagnetic substance contains nearly.
A single domain in ferromagnetic substance contains nearly.
108?109 | |
1012?1020 | |
1012?1016 | |
1015?1020 |
In extrinsic semiconductors doping is of the order of:
In extrinsic semiconductors doping is of the order of:
1 atom to 106 | |
1 atom to 108 | |
1 atom to 103 | |
1 atom to 104 |
The critical temperature of mercury is:
The critical temperature of mercury is:
4.2 K | |
3.72 K | |
7.2 K | |
1.18 K |
The critical temperature of Aluminum is:
The critical temperature of Aluminum is:
8.2 K | |
7.2 K | |
1.18 K | |
3.72 K |
A material which is insulator at 0 K and conduct at room temperature is:
A material which is insulator at 0 K and conduct at room temperature is:
Silver | |
Polythene | |
Germinium | |
Lead |