The current between B and D in the given figure is
|
(a) 1 amp |
(b) 2 amp |
(c) Zero |
(d) 0.5 amp |
The current between B and D in the given figure is
|
(a) 1 amp |
(b) 2 amp |
(c) Zero |
(d) 0.5 amp |
(c) Zero
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1 mg gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is
|
(a) 0.91 mg |
(b) 0.25 mg |
(c) 0.5 mg |
(d) 0.125 mg |
For a cell of e.m.f. 2V, a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a 2Ω resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is
|
(a) 0.25 Ω |
(b) 0.50 Ω |
(c) 0.80 Ω |
(d) 1.00 Ω |
The velocity of light in a medium is half its velocity in air. If ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is
|
(a) 15o |
(b) 30 o |
(c) 45 o |
(d) 60 o |
Focal length of a plane mirror is
|
(a) Zero |
(b) Infinite |
(c) Very less |
(d) Indefinite |
When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and 2v respectively. The work function of the metal is (h = Planck’s constant, c = velocity of light in air)
|
(a) 2hc |
(b) |
(c) |
(d) 0.5 |
A person uses spectacles of power +2D. He is suffering from
|
(a) Short sightedness or myopia |
(b) Long sightedness or hypermetropia |
|
(c) Presbyopia |
(d) Astigmatism |