Assertion : A red object appears dark in the yellow light
Reason : A red colour is scattered less
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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. |
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
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and 
ions having same kinetic energy pass through a region of space filled with uniform magnetic field B directed perpendicular to the velocity of ions. The masses of the ions 
and are respectively in the ratio 1 : 4 : 16. As a result
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(a) |
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(b) |
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(c) All ions will suffer the same deflection |
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(d) a, b |
The universal property of all substances is
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(a) Diamagnetism |
(b) Ferromagnetism |
(c) Paramagnetism |
(d) All of these |
A current of 10A is passing through a long wire which has semicircular loop of the radius 20cm as shown in the figure. Magnetic field produced at the centre of the loop is
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(a) 10 πμT |
(b) 5 πμT |
(c) 4 πμT |
(d) 2 πμT |
Energy conversion in a photoelectric cell takes place from
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(a) Chemical to electrical |
(b) Magnetic to electrical |
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(c) Optical to electrical |
(d) Mechanical to electrical |
Four wires of equal length and of resistances 10 ohms each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is
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(a) 10 ohm |
(b) 40 ohm |
(c) 20 ohm |
(d) 10/4 ohm |
Missing lines in a continuous spectrum reveal
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(a) Defects of the observing instrument |
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(b) Absence of some elements in the light source |
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(c) Presence in the light source of hot vapours of some elements |
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(d) Presence of cool vapours of some elements around the light source |
At noon the sun appears white because:
The maximum current that can be measured by a galvanometer of resistance 40 W is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm)
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(a) 5040 |
(b) 4960 |
(c) 2010 |
(d) 4050 |
