# The terminal voltage of the battery, whose emf is $$10~\text V$$ and internal resistance  $$1~\Omega,$$ when connected through an external resistance of $$4~\Omega$$ as shown in the figure is:                1. $$6~\text V$$ 2. $$8~\text V$$ 3. $$10~\text V$$ 4. $$4~\text V$$

Subtopic:  EMF & Terminal Voltage |
64%
From NCERT
NEET - 2024
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In an ideal transformer, the turns ratio is $$\cfrac{N_p}{N_s}=\cfrac{1}{2} .$$ The ratio $$V_s:V_p$$ is equal to (the symbols carry their usual meaning):
 1 $$2:1$$ 2 $$1:1$$ 3 $$1:4$$ 4 $$1:2$$
Subtopic:  Transformer |
63%
From NCERT
NEET - 2024
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A light ray enters through a right-angled prism at point $$P$$ with the angle of incidence $$30^\circ$$ as shown in figure. It travels through the prism parallel to its base $$BC$$ and emerges along the face $$AC$$. The refractive index of the prism is:

1. $${\dfrac{\sqrt5}{2}}$$
2. $${\dfrac{\sqrt3}{4}}$$
3. $${\dfrac{\sqrt3}{2}}$$
4. $${\dfrac{\sqrt5}{4}}$$
Subtopic:  Prisms |
From NCERT
NEET - 2024
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The quantities which have the same dimensions as those of solid angle are:
1. stress and angle
2. strain and arc
3. angular speed and stress
4. strain and angle
Subtopic:  Dimensions |
63%
From NCERT
NEET - 2024
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A thin flat circular disc of radius $$4.5~\text {cm}$$ is placed gently over the surface of water. If surface tension of water is $$0.07~\text{Nm}^{-1},$$ then the excess force required to take it away from the surface is:
1. $$198~\text{N}$$
2. $$1.98~\text{mN}$$
3. $$99~\text{N}$$
4. $$19.8~\text{mN}$$
Subtopic:  Surface Tension |
From NCERT
NEET - 2024
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
 Assertion (A): The potential $$(V)$$ at any axial point, at $$2~\text m$$  distance ($$r$$) from the centre of the dipole of dipole moment vector $$\vec P$$ of magnitude, $$4\times10^{-6}~\text{C m},$$ is $$\pm9\times10^3~\text{V}.$$ (Take $${\dfrac{1}{4\pi\varepsilon_0}}=9\times10^9$$ SI units) Reason (R): $$V=\pm{\dfrac{2P}{4\pi\varepsilon_0r^2}},$$ where $$r$$ is the distance of any axial point situated at $$2~\text m$$ from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below:
 1 Both (A) and (R) are True and (R) is not the correct explanation of (A). 2 (A) is True but (R) is False. 3 (A) is False but (R) is True. 4 Both (A) and (R) are True and (R) is the correct explanation of (A).
Subtopic:  Electric Potential |
51%
From NCERT
NEET - 2024
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In a uniform magnetic field of $$0.049~\text T$$, a magnetic needle performs $$20$$ complete oscillations in $$5$$ seconds as shown. The moment of inertia of the needle is $$9.8 × 10^{-6} ~\text{kg m}^2$$. If the magnitude of magnetic moment of the needle is $$x \times 10^{-5 }~\text {Am}^2;$$ then the value of '$$x$$' is:

1. $$128\pi^2$$
2.  $$50\pi^2$$
3. $$1280\pi^2$$
4. $$5\pi^2$$
Subtopic:  Bar Magnet |
From NCERT
NEET - 2024
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If the monochromatic source in Young's double slit experiment is replaced by white light, then:
 1 there will be a central dark fringe surrounded by a few coloured fringes. 2 there will be a central bright white fringe surrounded by a few coloured fringes. 3 all bright fringes will be of equal width. 4 interference pattern will disappear.
Subtopic:  Young's Double Slit Experiment |
57%
From NCERT
NEET - 2024
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Given below are two statements:
 Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges. Statement II: Atoms of each element are stable and emit their characteristic spectrum.

In the light of the above statements, choose the most appropriate answer from the options given below:
 1 Both Statement I and Statement II are incorrect. 2 Statement I is correct but Statement II is incorrect. 3 Statement I is incorrect but Statement II is correct. 4 Both Statement I and Statement II are correct.
Subtopic:  Spectral Series |
From NCERT
NEET - 2024
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The maximum elongation of a steel wire of $$1~\text m$$ length if the elastic limit of steel and its Young's modulus, respectively, are $$8 × 10^8 ~\text{N m}^{-2 }$$ and $$2 × 10^{11} ~\text{N m}^{-2},$$ is:
1. $$0.4~\text{mm}$$
2. $$40~\text{mm}$$
3. $$8~\text{mm}$$
4. $$4~\text{mm}$$
Subtopic:  Young's modulus |
66%
From NCERT
NEET - 2024