Tangent galvanometer is used to measure
| (a) Steady currents | (b) Current impulses |
| (c) Magnetic moments of bar magnets | (d) Earth's magnetic field |
Tangent galvanometer is used to measure
| (a) Steady currents | (b) Current impulses |
| (c) Magnetic moments of bar magnets | (d) Earth's magnetic field |
(a) Steady currents
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Twelve wires of equal length and same cross-section are connected in the form of a cube. If the resistance of each of the wires is R, then the effective resistance between the two diagonal ends would be
|
(a) 2 R |
(b) 12 R |
(c) |
(d) 8 R |
A 4 μF condenser is connected in parallel to another condenser of 8 μF. Both the condensers are then connected in series with a 12 μF condenser and charged to 20 volts. The charge on the plate of 4 μF condenser is
|
(a) 3.3 μC |
(b) 40 μC |
(c) 80 μC |
(d) 240 μC |
Effective capacitance between A and B in the figure shown is (all capacitance are in mF)
|
(a) 21 mF |
(b) 23 mF |
(c) |
(d) |
The work functions of metals A and B are in the ratio 1 : 2. If light of frequencies f and 2f are incident on the surfaces of A and B respectively, the ratio of the maximum kinetic energies of photoelectrons emitted is (f is greater than threshold frequency of A, 2f is greater than threshold frequency of B)
|
(a) 1 : 1 |
(b) 1 : 2 |
(c) 1 : 3 |
(d) 1 : 4 |
The capacitor of capacitance 4 μF and 6 μF are connected in series. A potential difference of 500 volts is applied to the outer plates of the two capacitor system. The potential difference across the plates of capacitor of 4 μF capacitance is
|
(a) 500 volts |
(b) 300 volts |
(c) 200 volts |
(d) 250 volts |

The electric potential V is given as a function of distance x (metre) by )volt. Value of electric field at x = 1 is
|
(a) 20 V/m |
(b) 6 V/m |
(c) 11 V/m |
(d) -23 V/m |
A beam with wavelength falls on a stack of partially reflecting planes with separation d. The angle q that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n = 1, 2, ……)
|
(a) |
(b) |
(c) |
(d) |