MCQ
To convert a moving coil galvanometer into voltmeter
- Aa low resistor is needed to join in parallel
- Ba low resistor is needed to join in series
- Ca high resistor is needed to join in parallel
- ✓a high resistor is needed to join in series
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When light rays from the sun fall on a convex lens along a direction parallel to its axis
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(a) Focal length for all colours is the same |
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(b) Focal length for violet colour is the shortest |
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(c) Focal length for yellow colour is the longest |
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(d) Focal length for red colour is the shortest |
Which of the following theories is the most satisfactory about the origin of the universe
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(a) Big Bang theory |
(b) Pulsating theory |
(c) Steady state theory |
(d) None of these |
From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is
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(a) 6 hours |
(b) 12 hours |
(c) 24 hours |
(d) 128 hours |
The reason of seeing the Sun a little before the sunrise is
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(a) Reflection of the light |
(b) Refraction of the light |
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(c) Scattering of the light |
(d) Dispersion of the light |
In a full wave rectifiers, input ac current has a frequency ‘n’. The output frequency of current is
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(a) n/2 |
(b) n |
(c) 2n |
(d) None of these |
γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than
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(a) 5.0 MeV |
(b) 4.02 MeV |
(c) 15.0 MeV |
(d) 1.02 MeV |
$\text{zero}$
$\frac{1}{8}\omega\text{Bl}^2$
$\frac{1}{2}\omega\text{Bl}^2$
$\text{B}\omega\text{l}^2$