While a capacitor remains connected to a battery and dielectric slab is applied between the plates, then
|
(a) Potential difference between the plates is changed |
(b) Charge flows from the battery to the capacitor |
|
(c) Electric field between the plates increases |
(d) Energy store in the capacitor decreases |
(b) Charge flows from the battery to the capacitor
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When Ge crystals are doped with phosphorus atom, then it becomes
|
(a) Insulator |
(b) P-type |
(c) N-type |
(d) Superconductor |
In the following arrangement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
|
(a) 0.9 V |
(b) 0.5 V |
(c) 0.4 V |
(d) 0.1 V |
Two identical light sources S1 and S2 emit light of same wavelength l. These light rays will exhibit interference if
|
(a) Their phase differences remain constant |
|
(b) Their phases are distributed randomly |
|
(c) Their light intensities remain constant |
|
(d) Their light intensities change randomly |
To convert a 800 mV range milli voltmeter of resistance 40 W into a galvanometer of 100 mA range, the resistance to be connected as shunt is
|
(a) 10 W |
(b) 20 W |
(c) 30 W |
(d) 40 W |
For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
|
(a) Potentiometer is more sensitive than voltmeter |
|
(b) The resistance of potentiometer is less than voltmeter |
|
(c) Potentiometer is cheaper than voltmeter |
|
(d) Potentiometer does not take current from the circuit |