Explanation:
A Van de Graff generators produces large voltage and less current. A Van de Graff generator is an electrostatic generator which creates very high electric potentials. It produces very high voltage direct current electricity at low current levels.
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Neutrino is a particle, which is
|
(a) Charged and has spin |
(b) Charged and has no spin |
|
(c) Charge less and has spin |
(d) Charge less and has no spin |
A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 
. The magnetic dipole moment of the coil is
|
(a) 0.15 |
(b) 0.3 |
(c) 0.45 
|
(d) 0.6
|
The radius of two metallic spheres A and B are 
and 
respectively (
. They are connected by a thin wire and the system is given a certain charge. The charge will be greater
|
(a) On the surface of the sphere B |
(b) On the surface of the sphere A |
|
(c) Equal on both |
(d) Zero on both |
Two identical cells send the same current in 2Ω resistance, whether connected in series or in parallel. The internal resistance of the cell should be
|
(a) 1 Ω |
(b) 2 Ω |
(c) |
(d) 2.5 Ω |
In a Young's double slit experiment, the fringe width will remain same, if (D = distance between screen and plane of slits, d = separation between two slits and λ = wavelength of light used)
|
(a) Both λ and D are doubled |
(b) Both d and D are doubled |
|
(c) D is doubled but d is halved |
(d) λ is doubled but d is halved |
The plane faces of two identical plano-convex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is
|
(a) 80 cm |
(b) 40 cm |
(c) 20 cm |
(d) 162 cm |
A thin oil layer floats on water. A ray of light making an angle of incidence of 40° shines on oil layer. The angle of refraction of light ray in water is (
)
|
(a) 36 .1° |
(b) 44.5° |
(c) 26. 8° |
(d) 28.9° |
The thermocouple is based on the principle of
|
(a) Seebeck effect |
(b) Thomson effect |
(c) Peltier effect |
(d) Joule effect |
