- AThe current flowing through the galvanometer when a unit voltage is applied across its terminals.
- BCurrent per unit deflection.
- CDeflection per unit current.
- DDflection per unit current when a unit voltage is applied across its terminals.
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A radioactive isotope X with a half-life of 1.37
years decays to Y which is stable. A sample of rock from the moon was found to contain both the elements X and Y which were in the ratio of 1 : 7. The age of the rock is
|
(a) 1.96 |
(b) 3.85 |
(c) 4.11 |
(d) 9.59 |
A current of 1.5 A flows through a copper voltameter. The thickness of copper deposited on the electrode surface of area
in 20 minutes will be (Density of copper = 9000
and E.C.E. of copper = 0.00033 g/C)
|
(a) 2.6 |
(b) 2.6 |
(c) 1.3 |
(d) 1.3 |
A magnifying glass is used to read the newspaper. As it is moved far away from the newspaper:
For a thermocouple, the temperature of inversion is that temperature at which thermo e.m.f. is
|
(a) Zero |
(b) Maximum
|
(c) Minimum |
(d) None of the above |
In the figure shown, the total resistance between A and B is
|
(a) 12 Ω |
(b) 4 Ω |
(c) 6 Ω |
(d) 8 Ω |
Figure given below shows a beam of light converging at point P. When a convex lens of focal length 16 cm is introduced in the path of the beam at a place O shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance x from the lens. The value x will be equal to
|
(a) 12 cm |
(b) 24 cm |
(c) 36 cm |
(d) 48 cm |
The spectrum of iodine gas under white light will be
|
(a) Only violet |
|
(b) Bright lines |
|
(c) Only red lines |
|
(d) Some black bands in continuous spectrum |