A rectangular loop is being pulled at a constant speed v, through a region of certain thickness d, in which a uniform magnetic field B is set up. The graph between position x of the right hand edge of the loop and the induced emf E will be
(a)
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(b)
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(c)
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(d)
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If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
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(a) Energy |
(b) Momentum |
(c) Velocity |
(d) Angular momentum |
Electronic configuration of germanium is 2, 8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added
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(a) The material obtained will be N-type germanium in which electrons and holes are equal in number |
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(b) The material obtained will be P-type germanium |
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(c) The material obtained will be N-type germanium which has more electrons than holes at room temperature |
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(d) The material obtained will be N-type germanium which has less electrons than holes at room temperature |
A bar magnet of magnetic moment 200 A-m2 is suspended in a magnetic field of intensity 0.25 N/A-m. The couple required to deflect it through 30o is
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(a) 50 N-m |
(b) 25 N-m |
(c) 20 N-m |
(d) 15 N-m |
A converging lens is used to form an image on a screen. When upper half of the lens is covered by an opaque screen
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(a) Half the image will disappear |
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(b) Complete image will be formed of same intensity |
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(c) Half image will be formed of same intensity |
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(d) Complete image will be formed of decreased intensity |
In the circuit shown below E1 = 4.0 V, R1 = 2 W, E2 = 6.0 V, R2 = 4 W and R3 = 2 W. The current I1 is
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(a) 1.6 A |
(b) 1.8 A |
(c) 1.25 A |
(d) 1.0 A |
Assertion : The following circuit represents 'OR' gate
Reason : For the above circuit Y = 
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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. |
A radioactive reaction is 
→ 
. How many α and β particles are emitted
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(a) 10α, 6β |
(b) 4 protons, 8 neutrons |
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(c) 6 electrons, 8 protons |
(d) 6β, 8α |
When current flows through a conductor, then the order of drift velocity of electrons will be
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(a) |
(b) |
(c) |
(d) |
