- AHorizontal component.
- BMagnetic meridian.
- CMagnetic declination.
- DMagnetic inclination.
Explanation:
Magnetic dip or inclination at a place is defined as the angle made by the Earth’s magnetic field with the horizontal in the magnetic
meridian. It is denoted by $\delta$.
Magnetic declination at a place is defined as the angle between the geographic meridian and magnetic meridian.
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A sample contains 16 gm of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is
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(a) Less than 1 mg |
(b) |
(c) |
(d) 1 gm |
A condenser having a capacity 2.0 micro farad is charged to 200 volts and then the plates of the capacitor are connected to a resistance wire. The heat produced in joules will be
|
(a) 4 |
(b) 4 |
(c) 4 |
(d) 2 |
Average energy stored in a pure inductance L when a current i flows through it, is
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(a) |
(b) |
(c) |
(d) |
A thermo couple uses Bismuth and Tellurium as the dissimilar metals. The sensitivity of bismuth is -72μV/℃ and that of the tellurium is 500μV/℃. If the difference between hot and cold junction is 100℃ then the maximum output will be
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(a) 50 mV |
(b) 7.2 mV |
(c) 42.8 mV |
(d) 57.2 mV |
A hot electric iron has a resistance of 80 Ω and is used on a 200 V source. The electrical energy spent, if it is used for two hours, will be
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(a) 8000 Wh |
(b) 2000 Wh |
(c) 1000 Wh |
(d) 800 Wh |
A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L1 and L2 having refractive indices n1 and n2 respectively (n2 > n1 > 1). The lens will diverge a parallel beam of light if it is filled with
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(a) Air and placed in air |
(b) Air and immersed in L1 |
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(c) L1 and immersed in L2 |
(d) L2 and immersed in L1 |
A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true

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(a) Potential difference across the terminals of the battery is maximum when R = r |
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(b) Power delivered to the resistor is maximum when R = r |
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(c) Current in the circuit is maximum when R = r |
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(d) Current in the circuit is maximum when R >> r |