- ✓$I_{0}=\sqrt{2}I_{rms}$
- B$I_{0}=I_{rms}$
- C$I_{0}=2~I_{rms}$
- D$I_{0}=\frac{I_{rms}}{\sqrt{2}}$
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At a place, the horizontal and vertical intensities of earth's magnetic field is 0.30 Gauss and 0.173 Gauss respectively. The angle of dip at this place is
| (a) 30° | (b) 90° | (c) 60° | (d) 45° |
Carbon dating is best suited for determining the age of fossils if their age in years is of the order of
|
(a) |
(b) |
(c) |
(d) |
Assertion : An electron is not deflected on passing through certain region of space. This observation confirms that there is no magnetic field in that region.
Reason : The deflection of electron depends on angle between velocity of electron and direction of magnetic field.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
$\text{p}=0,\text{ E}\neq0$
$\text{p}\neq0,\text{ E}=0$
$\text{p}\neq0,\text{ E}\neq0$
$\text{p}=0,\text{ E}=0$
The transconductance of a triode amplifier is 2.5 mili mho having plate resistance of 20 KW, amplification 10. Find the load resistance
|
(a) 5 kW |
(b) 25 kW |
(c) 20 kW |
(d) 50 kW |
A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in
|
(a) 256 year |
(b) 128 year |
(c) 64 year |
(d) 24 year |
The alloys constantan and manganin are used to make standard resistance due to they have
|
(a) Low resistivity |
(b) High resistivity |
|
(c) Low temperature coefficient of resistance |
(d) Both (b) and (c) |
A diver in a swimming pool wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light
|
(a) He must direct the beam vertically upwards |
|
(b) He has to direct the beam horizontally |
|
(c) He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection |
|
(d) He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection |
A proton of mass m and charge +e is moving in a circular orbit in a magnetic field with energy 1 MeV. What should be the energy of α - particle (mass = 4m and charge = + 2e), so that it can revolve in the path of same radius
|
(a) 1 MeV |
(b) 4 MeV |
(c) 2 MeV |
(d) 0.5 MeV |