- Aa low resistor is needed to join in parallel
- Ba low resistor is needed to join in series
- Ca high resistor is needed to join in parallel
- ✓a high resistor is needed to join in series
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An electric dipole is situated in an electric field of uniform intensity E whose dipole moment is p and moment of inertia is I. If the dipole is displaced slightly from the equilibrium position, then the angular frequency of its oscillations is
|
(a) |
(b) |
(c) |
(d) |
Earth's magnetic field always has a horizontal component except at or Horizontal component of earth's magnetic field remains zero at
| (a) Equator | (b) Magnetic poles | (c) A latitude of 60o | (d) An altitude of 60o |
A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is
|
(a) 4.81 eV |
(b) 3.74 eV |
(c) 2.66 eV |
(d) 1.07 eV |
At zero Kelvin a piece of germanium
|
(a) Becomes semiconductor |
(b) Becomes good conductor |
|
(c) Becomes bad conductor |
(d) Has maximum conductivity |

In the following circuit a 10 m long potentiometer wire with resistance 1.2 ohm/m, a resistance R1 and an accumulator of emf 2 V are connected in series. When the emf of thermocouple is 2.4 mV then the deflection in galvanometer is zero. The current supplied by the accumulator will be
|
(a) 4 × 10–4 A |
(b) 8 × 10–4 A |
(c) 4 × 10–3 A |
(d) 8 × 10–3 A |
The forbidden energy band gap in conductors, semiconductors and insulators are and
respectively. The relation among them is
|
(a) |
(b) |
|
(c) |
(d) |