MCQ
The color coding of earth, live and neutral wire respectively is:
- AGreen, Red, black.
- BRed, Green, Black.
- CRed, Black, Green.
- DNone of the above.
Explanation:
The electric power line enters our house through three wires- namely the live wire, the neutral wire and the earth wire. To avoid confusion we follow a colour code for insulating these wires. The red wire is the live wire, and the black wire is neutral. The earth wire is given green plastic insulation. The colour coding of wires is green for earth red for live and black for neutral.
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Ray optics fails when
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(a) The size of the obstacle is 5 cm |
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(b) The size of the obstacle is 3 cm |
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(c) The size of the obstacle is less than the wavelength of light |
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(d) (a) and (b) both |
For a given triode μ = 20. The load resistance is 1.5 times the anode resistance. The maximum gain will be
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(a) 16 |
(b) 12 |
(c) 10 |
(d) None of the above |
The magnetic field due to a short magnet at a point on its axis at distance X cm from the middle point of the magnet is 200 Gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is
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(a) 100 Gauss |
(b) 400 Gauss |
(c) 50 Gauss |
(d) 200 Gauss |
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. |