- A$\lambda_{ m }>\lambda_{ x }>\lambda_{ y }$
- ✓$\lambda_{ m }>\lambda_{ v }>\lambda_{ x }$
- C$\lambda_{ v }>\lambda_{ x }>\lambda_{ m }$
- D$\lambda_{ v }>\lambda_{ m }>\lambda_{ x }$
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Lines which represent places of constant angle of dip are called
| (a) Isobaric lines | (b) Isogonic lines | (c) Isoclinic lines | (d) Isodynamic lines |
When a charge of 3 coulombs is placed in a uniform electric field, it experiences a force of 3000 Newton. Within this field, potential difference between two points separated by a distance of 1 cm is
|
(a) 10 volts |
(b) 90 volts |
(c) 1000 volts |
(d) 3000 volts |
For a given plate-voltage, the plate current in a triode is maximum when the potential of
|
(a) The grid is positive and plate is negative |
(b) The grid is positive and plate is positive |
|
(c) The grid is zero and plate is positive |
(d) The grid is negative and plate is positive |
The strength of the magnetic field in which the magnet of a vibration magnetometer is oscillating is increased 4 times its original value. The frequency of oscillation would then become
| (a) Twice its original value | (b) Four times its original value |
| (c) Half its original value | (d) One-fourth its original value |
The electric bulbs have tungsten filaments of same length. If one of them gives 60 watt and other 100 watt, then
|
(a) 100 watt bulb has thicker filament |
|
(b) 60 watt bulb has thicker filament |
|
(c) Both filaments are of same thickness |
|
(d) It is possible to get different wattage unless the lengths are different |
For a cell of e.m.f. 2V, a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a 2Ω resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is
|
(a) 0.25 Ω |
(b) 0.50 Ω |
(c) 0.80 Ω |
(d) 1.00 Ω |
If six identical cells each having an e.m.f. of 6V are connected in parallel, the e.m.f. of the combination is
|
(a) 1 V |
(b) 36 V |
(c) |
(d) 6 V |
A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with the distance d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then distance d in cm will be
|
(a) 25 |
(b) 15 |
(c) 30 |
(d) 50 |