- ✓zero
- B$\pi / 2$
- C$\pi$
- D$3 \pi / 2$
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Diffraction and interference of light suggest
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(a) Nature of light is electro-magnetic |
(b) Wave nature |
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(c) Nature is quantum |
(d) Nature of light is transverse |
The field of view is maximum for
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(a) Plane mirror |
(b) Concave mirror |
(c) Convex mirror |
(d) Cylindrical mirror |
In the adjoining figure, four capacitors are shown with their respective capacities and the P.D. applied. The charge and the P.D. across the 4μF capacitor will be
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(a) 600 μC; 150 volts |
(b) 300 μC; 75 volts |
(c) 800 μC; 200 volts |
(d) 580 μC; 145 volts |
Which statement is correct for a zone plate and a lens
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(a) Zone plate has multi focii whereas lens has one |
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(b) Zone plate has one focus whereas lens has multiple focii |
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(c) Both are correct |
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(d) Zone plate has one focus whereas a lens has infinite |
A cell of internal resistance 3 ohm and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is
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(a) 30 mV/cm |
(b) 10 mV/cm |
(c) 20 mV/cm |
(d) 4 mV/cm |
Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is
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(a) F / 8 |
(b) F / 4 |
(c) 4 F |
(d) F / 16 |
A double convex thin lens made of glass (refractive index μ = 1.5) has both radii of curvature of magnitude 20 cm. Incident light rays parallel to the axis of the lens will converge at a distance L such that
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(a) L = 20 cm |
(b) L = 10 cm |
(c) L = 40 cm |
(d) L = 20 / 3 cm |