Olympiad: Physics MCQs (Practice_Test 26 of 35)

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1. The given figure shows the waveforms for two inputs A and B and that for the output Y of a logic circuit. The logic circuit is
1. an AND gate
2. an OR gate
3. a NAND gate
4. an Exclusive OR gate
• Assertion (A) : p-n junction diodes can be used even at ultra high frequencies.
• Reason (R) : Capacitate reactance of a p-n junction diode increases as frequency increases.
1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true, but R is false
4. A is false but R is true
• Assertion (A) : e/m of beta particles is not constant.
• Reason (R) : Velocities of beta particles are quite high and are comparable to the velocity of light.
1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true, but R is false
4. A is false but R is true
• Assertion (A) : In Compton effect, the scattered photon has more energy than the incident photon.
• Reason (R) : Energy and momentum are conserved during the scattering of a photon by an electron.
1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true, but R is false
4. A is false but R is true
• Assertion (A) : When a sound wave propagates through air, the displacements take place in the direction of propagation.
• Reason (R) : Sound waves can be polarized as in the case of light rays.
1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true, but R is false
4. A is false but R is true
• Assertion (A) : A convex lens suffers from chromatic aberration.
• Reason (R) : All parallel rays passing through a convex lens do not come to a focus at the same point.
1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true, but R is false
4. A is false but R is true

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