10 wires (same length, same area, same material) are connected in parallel and each has 1 Ω resistance, then the equivalent resistance will be
|
(a) 10 Ω |
(b) 1 W |
(c) 0.1 W |
(d) 0.001 W |
(c) 0.1 W
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Laser beams are used to measure long distances because
|
(a) They are monochromatic |
(b) They are highly polarised |
|
(c) They are coherent |
(d) They have high degree of parallelism |
In terms of Rydberg's constant R, the wave number of the first Balmer line is
|
(a) R |
(b) 3R |
(c) |
(d) |
$\overrightarrow{\text{F}}\times\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}\times\overrightarrow{\text{r}}$
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
|
(a) 9 : 4 |
(b) 4 : 3 |
(c) 3 : 8 |
(d) 3 : 2 |
Two copper balls, each weighing 10g are kept in air 10 cm apart. If one electron from every 
atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is 63.5)
|
(a) 2.0 |
(b) 2.0 |
(c) 2.0 |
(d) 2.0 |
In the circuit shown in the figure, the current flowing in 2 Ω resistance
|
(a) 1.4 A |
(b) 1.2 A |
(c) 0.4 A |
(d) 1.0 A |
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 |
