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The resistance in the following circuit is increased at a particular instant. At this instant the value of resistance is 10W. The current in the circuit will be now
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(a) i = 0.5 A |
(b) i > 0.5 A |
(c) i < 0.5 A |
(d) i = 0 |
If a transparent medium of refractive index m = 1.5 and thickness t = 2.5 × 10–5 m is inserted in front of one of the slits of Young’s Double Slit experiment, how much will be the shift in the interference pattern? The distance between the slits is 0.5 mm and that between slits and screen is 100 cm
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(a) 5 cm |
(b) 2.5 cm |
(c) 0.25 cm |
(d) 0.1 cm |
A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is 6mm. If a glass plate (dielectric constant K = 9) of 4.5 mm is introduced between them, then the capacity will become
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(a) 2 times |
(b) The same |
(c) 3 times |
(d) 4 times |
Find VAB
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(a) 10 V |
(b) 20 V |
(c) 30 V |
(d) None of these |
When the wave of hydrogen atom comes from infinity into the first orbit then the value of wave number is
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(a) 109700 cm–1 |
(b) 1097cm–1 |
(c) 109 cm–1 |
(d) None of these |
An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be
|
(a) |
(b) |
(c) |
(d) |
The distance between the plates of a parallel plate condenser is 8mm and P.D. 120 volts. If a 6mm thick slab of dielectric constant 6 is introduced between its plates, then
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(a) The charge on the condenser will be doubled |
|
(b) The charge on the condenser will be reduced to half |
|
(c) The P.D. across the condenser will be 320 volts |
|
(d) The P.D. across the condenser will be 45 volts |
A short magnet oscillates with a time period 0.1 s at a place where horizontal magnetic field is 24μT. A downward current of 18 A is established in a vertical wire 20 cm east of the magnet. The new time period of oscillator
|
(a) 0.1 s |
(b) 0.089 s |
(c) 0.076 s |
(d) 0.057 s |
The current in a triode at anode potential 100 V and grid potential – 1.2 V is 7.5 mA. If grid potential is changed to – 2.2 V, the current becomes 5.5 mA. the value of trans conductance (gm) will be
|
(a) 2 mili mho |
(b) 3 mili mho |
(c) 4 mili mho |
(d) 0.2 mili mho |
