Two coherent monochromatic light beams of intensities \(I\) and \(4I\) superimpose. The maximum and minimum possible intensities in the resulting beam are:
1. \(5I\) and \(I\)
2. \(5I\) and \(3I\)
3. \(3I\) and \(I\)
4. \(9I\) and \(I\)
Subtopic: Superposition Principle |
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From NCERT
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The energy gap between conduction band and valence band if of the order of 0.07 eV. It is a/an
Subtopic: Energy Band theory |
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The earth circles around the sun once a year. The work which would have to be done on the earth to bring it to rest relative to the sun is, (Ignore the rotation of earth about its own axis) given that the mass of the earth = 6×1024 kg and the distance between sun and earth is 1.5×108 km)
Subtopic: Work Energy Theorem |
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A longitudinal wave is represented by
x= x0 sin2π
The maximum particle velocity will be four times the wave velocity, if
x= x0 sin2π
The maximum particle velocity will be four times the wave velocity, if
Subtopic: Wave Motion |
57%
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The rate of dissipation of heat by a black body at temperature T is Q. What will be the rate of dissipation of heat by another body at temperature 2 T and emissivity 0.25?
1. 16 Q
2. 4 Q
3. 8 Q
4. 4.5 Q
2. 4 Q
3. 8 Q
4. 4.5 Q
Subtopic: Stefan-Boltzmann Law |
59%
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The radius of gyration of a body about an axis at a distance of 6 cm from its centre of mass is 10 cm. Then, its radius of gyration about a parallel axis through its centre of mass will be
1. 800 cm
2. 8 cm
3. 0.8 cm
4. 80 cm
2. 8 cm
3. 0.8 cm
4. 80 cm
Subtopic: Moment of Inertia |
59%
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Assertion: The projectile has only vertical component of velocity at the highest point of its trajectory.
Reason: At the highest point only one component of velocity present.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Projectile Motion |
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Assertion: Thrust on a rocket depends not only on the rate of decrease of mass.
Reason: Thrust also depends upon exhaust speed of the gases.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Newton's Laws |
52%
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Assertion: When a ball collides elastically with a floor, it rebounds with the same velocity as with it strikes.
Reason: Momentum of earth + ball system remains constant.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Collisions |
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