Select the correct statement
|
(a) In a full wave rectifier, two diodes work alternately |
|
(b) In a full wave rectifier, two diodes work simultaneously |
|
(c) The efficiency of full wave and half wave rectifiers is same |
|
(d) The full wave rectifier is bi-directional |
(a) In a full wave rectifier, two diodes work alternately
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In Young's double slit experiment when wavelength used is 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm wide. What is the distance between the slits
|
(a) 0.024 cm |
(b) 2.4 cm |
(c) 0.24 cm |
(d) 0.2 cm |
An archaeologist analyses the wood in a prehistoric structure and finds that 
(Half life = 5700 years) to 
is only one- fourth of that found in the cells buried plants. The age of the wood is about
|
(a) 5700 years |
(b) 2850 years |
(c) 11,400 years |
(d) 22,800 years |
Work of moderator is
|
(a) To control the velocity of neutrons |
(b) Cooling |
|
(c) As fuel |
(d) It is used for safety |
A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of the material is
|
(a) 4.4 |
(b) 2.2 |
|
(c) 1.1 |
(d) 0.22 |
Fission of nuclei is possible because the binding energy per nucleon in them
|
(a) Increases with mass number at high mass numbers |
|
(b) Decreases with mass number at high mass numbers |
| (c) Increases with mass number at low mass numbers |
| (d) Decreases with mass number at low mass numbers |
The light when enters the human eye experiences most of the refraction while passing through
|
(a) Cornea |
(b) Aqueous humour |
(c) Vitrous humour |
(d) Crystalline lens |
