Select the correct statement
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(a) In a full wave rectifier, two diodes work alternately |
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(b) In a full wave rectifier, two diodes work simultaneously |
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(c) The efficiency of full wave and half wave rectifiers is same |
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(d) The full wave rectifier is bi-directional |
(a) In a full wave rectifier, two diodes work alternately
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A mass m = 20 g has a charge q = 30 mC. It moves with a velocity of 20 m/s and enters a region of electric field of 80 N/C in the same direction as the velocity of the mass. The velocity of the mass after 3 seconds in this region is
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(a) 80 m/s |
(b) 56 m/s |
(c) 44 m/s |
(d) 40 m/s |
Energy generation in stars is mainly due to
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(a) Chemical reactions |
(b) Fission of heavy nuclei |
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(c) Fusion of light nuclei |
(d) Fusion of heavy nuclei |
$\text{v}=\frac{\text{v}_1+\text{v}_2}{2}$
$\text{v}=\sqrt{\text{v}_1\text{v}_2}$
$\frac{2}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
$\frac{1}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
When Ge crystals are doped with phosphorus atom, then it becomes
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(a) Insulator |
(b) P-type |
(c) N-type |
(d) Superconductor |
A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be
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(a) 10 cm |
(b) 15 cm |
(c) 20 cm |
(d) 30 cm |