- A$\mu_0 \frac{d \phi_{ E }}{d t}$
- B$\mu_0 \in_0 \frac{d \phi_{ E }}{d t}$
- ✓$\in_0 \frac{d \phi_{ E }}{d t}$
- D$\frac{1}{\in_0} \frac{d \phi_{ E }}{d t}$
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To measure which of the following, is a tangent galvanometer used
| (a) Charge | (b) Angle | (c) Current | (d) Magnetic intensity |
A 50 ohm galvanometer gets full scale deflection when a current of 0.01 A passes through the coil. When it is converted to a 10 A ammeter, the shunt resistance is
|
(a) 0.01 W |
(b) 0.05 W |
(c) 2000 W |
(d) 5000 W |
AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms. It is connected in series with a resistance R = 40 ohms and a battery of e.m.f. 2 V and negligible internal resistance. If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is

|
(a) 0.8 V |
(b) 1.6 V |
(c) 0.08 V |
(d) 0.16 V |
The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature 27oC and 127oC respectively is
|
(a) |
(b) |
(c) |
(d) 1 |
The hyper-metropia is a
|
(a) Short-side defect |
(b) Long- side defect |
|
(c) Bad vision due to old age |
(d) None of these |
A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process
|
(a) No work is done |
|
(b) Work is done at the cost of the energy already stored in the capacitor before the slab is inserted |
|
(c) Work is done at the cost of the battery |
|
(d) Work is done at the cost of both the capacitor and the battery |
The Boolean equation of NOR gate is
|
(a) C = A + B |
(b) C = |
(c) C = A× B |
(d) C = |