Explanation:
Current is induced in a coil when flux through the coil changes. The flux through the coil changes when a magnet moves relative to the coil and coil is at rest relative to the magnet.
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A logic gate is an electronic circuit which
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(a) Makes logic decisions |
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(b) Allows electrons flow only in one direction |
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(c) Works binary algebra |
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(d) Alternates between 0 and 1 values |
When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-ray tube is operating at 40,000 volts
| (a) 0.25 Å | (b) 0.5 Å | (c) 1.5 Å | (d) 1.0 Å |
Assertion : Newton’s rings are formed in the reflected system. When the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is dark.
Reason : The reflection is Newton’s ring cases will be from a denser to a rarer medium and the two interfering rays are reflected under similar conditions.
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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 focal length of a convex mirror is 20 cm its radius of curvature will be
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(a) 10 cm |
(b) 20 cm |
(c) 30 cm |
(d) 40 cm |
The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
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(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |
The example of nuclear fusion is
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(a) Formation of Ba and Kr from U235 |
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(b) Formation of He from H |
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(c) Formation of Pu – 235 from U - 235 |
| (d) Formation of water from hydrogen and oxygen |
If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then
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(a) The electron will turn to its right |
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(b) The electron will turn to its left |
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(c) The velocity of the electron will increase |
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(d) The velocity of the electron will remain unchanged |
Assertion : The mass of b-particles when they are emitted is higher than the mass of electrons obtained by other means.
Reason : b-particle and electron, both are similar particles.
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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. |
