Study HubHubPage 114/118Scan verified MCQs with the answer highlighted, then open explanations when you want the reasoning.
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Kinematics
The distance covered by a body in time t starting from rest is _________?
The formula for the distance covered by a body starting from rest under constant acceleration a in time t is s = (1/2) a t². Option A, written as at2/2, correctly represents this formula.
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Light And Optics
Which one of the following is nearly monochromatic light?
Sodium lamps emit light that is nearly monochromatic, primarily at the yellow wavelength (around 589 nm), making them close to monochromatic sources. Other options like fluorescent tubes and neon lamps emit multiple wavelengths, so they are not nearly monochromatic.
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Waves and Sound
The beat frequency (audible) for a human ear is ________?
The typical audible beat frequency that a human ear can perceive is around 7 Hz, as beats are perceived when two close frequencies interfere, producing a fluctuation in sound intensity at the difference frequency. This is within the range humans can detect as beats.
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Wave Superposition
When two identical traveling waves are superimposed, the velocity of the resultant wave _________?
When two identical traveling waves are superimposed, their velocities do not change because wave velocity depends on the medium and wave properties, not on superposition. Therefore, the resultant wave's velocity remains unchanged.
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Momentum
Momentum depends upon __________?
Momentum is defined as the product of an object's mass and its velocity, so it depends on both the mass and the velocity of the body.
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Superconductivity
Resistance of a superconductor is _________?
A superconductor has zero electrical resistance below its critical temperature, allowing current to flow without energy loss. This is a fundamental property distinguishing superconductors from normal conductors.
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Resistivity And Resistance
A wire of uniform cross-sectional area A, length L, and resistance R is cut into two parts. What happens to the resistivity of each part?
Resistivity is a material property and does not depend on the shape or size of the material. Cutting the wire changes its length and resistance but not its resistivity, which remains the same for each part.
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Electric Resistance
Resistance of an ideal insulator is _________?
An ideal insulator does not allow any current to pass through it, which means its resistance is infinitely large. Therefore, the resistance of an ideal insulator is infinite.
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Wave Interference
Silence zone occurs due to __________?
A silence zone occurs due to destructive interference, where two sound waves of the same frequency and opposite phase cancel each other out, resulting in a reduction or absence of sound.
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Wave Phenomena
The Doppler effect applies to __________?
The Doppler effect occurs for any type of wave when there is relative motion between the source and the observer. It applies to both sound waves and light waves, causing a shift in frequency or wavelength.