- AElectric charge.
- BElectric field.
- CBoth a and b.
- DNone.
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What is a virtual image?
In general, metallic ropes are suspended on the carriers which take inflammable material. The reason is
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(a) There speed is controlled |
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(b) To keep the centre of gravity of the carrier nearer to the earth |
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(c) To keep the body of the carrier in contact with the earth |
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(d) Nothing should be placed under the carrier |
Assertion : Red shift confirms that the universe is expanding
Reason : Wavelength of red light is maximum in the visible region
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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 temperature of cold junction and neutral temperature of a thermocouple are 15℃ and 280℃ respectively. The temperature of inversion is
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(a) 295℃ |
(b) 265℃ |
(c) 545℃ |
(d) 575℃ |
A TV tower has a height of 100 m. The average population density around the tower is 1000 per km2. The radius of the earth is 6.4 m. the population covered by the tower is
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(a) 2 |
(b) 3 |
(c) 4 |
(d) 6 |
The focal length of lens of refractive index 1.5 in air is 30 cm. When it is immersed in a liquid of refractive index
, then its focal length in liquid will be
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(a) 30 cm |
(b) 60 cm |
(c) 120 cm |
(d) 240 cm |
Assertion : The permeability of a ferromagnetic material is independent of the magnetic field.
Reason : Permeability of a material is a constant quantity.
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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. |