- AStraight line
- BParabola
- ✓Hyperbola
- DCircle
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Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be

|
(a) |
(b) |
(c) |
(d) |
The refractive index of a prism for a monochromatic wave is
and its refracting angle is 60°. For minimum deviation, the angle of incidence will be
|
(a) 30° |
(b) 45° |
(c) 60° |
(d) 75° |
The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to
|
(a) |
(b) |
(c) 1/ |
(d) 1/V |
A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by
|
(a) 2.0 ohm |
(b) 0.25 ohm |
(c) 1.0 ohm |
(d) 0.5 ohm |
A thin lens focal length
and its aperture has diameter d. It forms an image of intensity I. Now the central part of the aperture upto diameter
is blocked by an opaque paper. The focal length and image intensity will change to
|
(a) |
(b) f and |
(c) |
(d) f and |
When air in a capacitor is replaced by a medium of dielectric constant K, the capacity
|
(a) Decreases K times |
(b) Increases K times |
(c) Increases |
(d) Remains constant |
The capacity of parallel plate condenser depends on
|
(a) The type of metal used |
(b) The thickness of plates |
|
(c) The potential applied across the plates |
(d) The separation between the plates |
A beam of fast moving alpha particles were directed towards a thin film of gold. The parts
and
of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in

|
(a) |
(b) |
|
(c) |
(d) |