Magnetic induction is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Both (a) and (b) |
(d) None of the above |
Magnetic induction is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Both (a) and (b) |
(d) None of the above |
(b) Vector quantity
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Three positive charges of equal value q are placed at the vertices of an equilateral triangle. The resulting lines of force should be sketched as in
|
(a) |
(b) |
(c) |
(d) |
The fringe width in Young’s double slit experiment increases when
|
(a) Wavelength increases |
(b) Distance between the slits increases |
|
(c) Distance between the source and screen decreases |
(d) The width of the slits increases |
A combination of two thin lenses with focal lengths and
respectively forms an image of distant object at distance 60 cm when lenses are in contact. The position of this image shifts by 30 cm towards the combination when two lenses are separated by 10 cm. The corresponding values of
and
are
|
(a) 30 cm,-60 cm |
(b) 20 cm, -30 cm |
(c) 15 cm, -20 cm |
(d) 12 cm, - 15 cm |
In the circuit shown here and battery B = 20V. The switch
is first closed. It is then opened and afterwards
is closed. What is the charge finally on
|
(a) 120 μC |
(b) 80 μC |
(c) 40 μC |
(d) 20 μC |
Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2m. The ratio of e.m.f.'s of the two cells is
|
(a) 3 : 5 |
(b) 5 : 3 |
(c) 3 : 4 |
(d) 4 : 3 |

Intensity of magnetic field due to earth at a point inside a hollow steel box is
|
(a) Less than outside |
(b) More than outside | (c) Same | (d) Zero |