# The ratio of radius of gyration of a solid sphere of mass $$M$$ and radius $$R$$ about its own axis to the radius of gyration of the thin hollow sphere of same mass and radius about its axis is: 1. $$5:2$$ 2. $$3:5$$ 3. $$5:3$$ 4. $$2:5$$

Subtopic:  Moment of Inertia |
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NEET - 2023
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An ac source is connected to a capacitor $$C$$. Due to decrease in its operating frequency:
 1 capacitive reactance remains constant 2 capacitive reactance decreases. 3 displacement current increases. 4 displacement current decreases.
Subtopic:  Different Types of AC Circuits |
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NEET - 2023
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In hydrogen spectrum, the shortest wavelength in the Balmer series is $$\lambda$$. The shortest wavelength in the Bracket series is:
1. $$16\lambda$$
2. $$2\lambda$$
3. $$4\lambda$$
4. $$9\lambda$$
Subtopic:  Spectral Series |
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NEET - 2023
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Resistance of a carbon resistor determined from colour codes is $$(22000 \pm 5 \%) ~\Omega$$. The colour of third band must be:
1. Yellow
2. Red
3. Green
4. Orange
Subtopic:  Colour Coding of Resistors (OLD NCERT) |
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NEET - 2023
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A vehicle travels half the distance with speed $$v$$ and the remaining distance with speed $$2v$$. Its average speed is:
1. $$\frac{3v}{4}$$
2. $$\frac{v}{3}$$
3. $$\frac{2v}{3}$$
4. $$\frac{4v}{3}$$
Subtopic:  Average Speed & Average Velocity |
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NEET - 2023
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The potential energy of a long spring when stretched by $$2$$ cm is $$U$$. If the spring is stretched by $$8$$ cm, potential energy stored in it will be:
 1 $$16U$$ 2 $$2U$$ 3 $$4U$$ 4 $$8U$$
Subtopic:  Elastic Potential Energy |
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NEET - 2023
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A bullet is fired from a gun at the speed of $$280$$ ms–1 in the direction $$30^\circ$$ above the horizontal. The maximum height attained by the bullet is: ($$g=9.8$$ ms–2, $$\mathrm{sin}30^{0}=0.5$$ )
 1 $$3000$$ m 2 $$2800$$ m 3 $$2000$$ m 4 $$1000$$ m
Subtopic:  Projectile Motion |
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NEET - 2023
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The half-life of a radioactive substance is $$20$$ minutes. In how much time, the activity of substance drops to $$(\frac{1}{16})^{\mathrm{th}}$$ of its initial value?
1. $$80$$ minutes
2. $$20$$ minutes
3. $$40$$ minutes
4. $$60$$ minutes
Subtopic:  Radioactivity (OLD NCERT) |
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NEET - 2023
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The net magnetic flux through any closed surface is:
1. negative
2. zero
3. positive
4. infinity
Subtopic:  Analogy between Electrostatics & Magnetostatics |
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NEET - 2023
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A metal wire has mass $$(0.4\pm 0.002)~\mathrm{g}$$, radius $$(0.3\pm 0.001)~\mathrm{mm}$$ and length $$(5\pm 0.02)~\mathrm{cm}$$. The maximum possible percentage error in the measurement of density will nearly be:
1. $$1.4 \%$$
2. $$1.2 \%$$
3. $$1.3 \%$$
4. $$1.6 \%$$
Subtopic:  Errors |
From NCERT
NEET - 2023
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