MCQ
Scale used in moving coil galvanometer is:
- AFunction scale
- BLinear scale
- CExponential scale
- DNone of these
Explanation:
Linear scale is used in moving coil galvanometer.
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GaAs is
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(a) Element semiconductor |
(b) Alloy semiconductor |
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(c) Bad conductor |
(d) Metallic semiconductor |
Two wires ‘A’ and ‘B’ of the same material have their lengths in the ratio 1 : 2 and radii in the ratio 2 : 1. The two wires are connected in parallel across a battery. The ratio of the heat produced in ‘A’ to the heat produced in ‘B’ for the same time is
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(a) 1 : 2 |
(b) 2 : 1 |
(c) 1 : 8 |
(d) 8 : 1 |
Which of the following statements is incorrect about hysteresis
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(a) This effect is common to all ferromagnetic substances |
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(b) The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material |
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(c) The hysteresis loop area is independent of the thermal energy developed per unit volume of the material |
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(d) The shape of the hysteresis loop is characteristic of the material |
Assertion : Density of all the nuclei is same.
Reason : Radius of nucleus is directly proportional to the cube root of mass number.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The pole strength of a bar magnet is 48 ampere-metre and the distance between its poles is 25 cm. The moment of the couple by which it can be placed at an angle of 30o with the uniform magnetic intensity of flux density 0.15 Newton /ampere-metre will be
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(a) 12 Newton × metre |
(b) 18 Newton × metre |
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(c) 0.9 Newton × metre |
(d) None of the above |
Plane of eddy currents makes an angle with the plane of magnetic lines of force equal to
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(a) 40° |
(b) 0° |
(c) 90° |
(d) 180° |
An N-type and P-type silicon can be obtained by doping pure silicon with
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(a) Arsenic and Phosphorous |
(b) Indium and Aluminium |
|
(c) Phosphorous and Indium |
(d) Aluminium and Boron |
In the context of Doppler effect in light, the term ‘red shift’ signifies
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(a) Decrease in frequency |
(b) Increase in frequency |
|
(c) Decrease in intensity |
(d) Increase in intensity |