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A body has – 80 micro coulomb of charge. Number of additional electrons in it will be
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(a) 8 |
(b) 80 |
(c) 5 |
(d) 1.28 |
Constantan wire is used in making standard resistances because its
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(a) Specific resistance is low |
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(b) Density is high |
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(c) Temperature coefficient of resistance is negligible |
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(d) Melting point is high |
The time taken by sunlight to cross a 5 mm thick glass plate (μ = 3/2) is
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(a) 0.25 |
(b) 0.167 |
(c) 2.5 |
(d) 1.0 |
Which of the following is a correct statement
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(a) Beta rays are same as cathode rays |
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(b) Gamma rays are high energy neutrons |
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(c) Alpha particles are singly ionized helium atoms |
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(d) Protons and neutrons have exactly the same mass |
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5º and the prism is made of a material of refractive index 1.5, the angle of incidence is:
For a medium, refractive indices for violet, red and yellow are 1.62, 1.52 and 1.55 respectively, then dispersive power of medium will be
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(a) 0.65 |
(b) 0.22 |
(c) 0.18 |
(d) 0.02 |
(1) The product of a volt and a coulomb is a joule.
(2) The product of a volt and an ampere is a joule/second.
(3) The product of volt and watt is horse power.
(4) Watt-hour can be measured in terms of electron volt.
State if
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(a) All four are correct |
(b) (1), (2) and (4) are correct |
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(c) (1) and (3) are correct |
(d) (3) and (4) are correct |
