If \(\phi\) is the work function of photosensitive material in electron-volts and light of a wavelength of numerical value \(\lambda=\dfrac{{hc}}{{e}}\) metres is incident on it with energy above its threshold value at an instant, then the maximum kinetic energy of the photo-electron ejected by it at that instant is (in SI units):
(take \(h\) as Plank's constant and \(c\) as the velocity of light in free space)
(take \(h\) as Plank's constant and \(c\) as the velocity of light in free space)
| 1. | \({e}+2\phi \) | 2. | \(2{e}-\phi \) |
| 3. | \({e}-\phi \) | 4. | \({e}+\phi \) |
Subtopic: Einstein's Photoelectric Equation |
81%
Level 1: 80%+
NEET - 2024
Hints
Among the various types of electromagnetic radiation, the one with the smallest wavelength is:
| 1. | \(\mathrm{X}\)-rays | 2. | Gamma rays |
| 3. | Ultraviolet rays | 4. | Microwaves |
Subtopic: Electromagnetic Spectrum |
81%
Level 1: 80%+
NEET - 2024
Hints
The equilibrium state of a thermodynamic system is described by:
Choose the most appropriate answer from the options given below:
| A. | Pressure | B. | Total heat |
| C. | Temperature | D. | Volume |
| E. | Work done | ||
| 1. | A, B and E only | 2. | B, C and D only |
| 3. | A, B and C only | 4. | A, C and D only |
Subtopic: Basic Terms |
72%
Level 2: 60%+
NEET - 2024
Hints
Some energy levels of a molecule are shown in the figure with their wavelengths of transitions.
Then:
1. \(\lambda_{3}>\lambda_{2},\lambda_{1}=2\lambda_{2}\)
2. \(\lambda_{3}>\lambda_{2},\lambda_{1}=4\lambda_{2}\)
3. \(\lambda_{1}>\lambda_{2},\lambda_{2}=2\lambda_{3}\)
4. \(\lambda_{2}>\lambda_{1},\lambda_{2}=2\lambda_{3}\)
Then:
1. \(\lambda_{3}>\lambda_{2},\lambda_{1}=2\lambda_{2}\)
2. \(\lambda_{3}>\lambda_{2},\lambda_{1}=4\lambda_{2}\)
3. \(\lambda_{1}>\lambda_{2},\lambda_{2}=2\lambda_{3}\)
4. \(\lambda_{2}>\lambda_{1},\lambda_{2}=2\lambda_{3}\)
Subtopic: Spectral Series |
55%
Level 3: 35%-60%
NEET - 2024
Hints
A box of mass \(5 ~\text{kg}\) is pulled by a cord, up along a frictionless plane inclined at \(30^\circ\) with the horizontal. The tension in the cord is \(30~\text N.\) The acceleration of the box is: (take \(g=10~\text{ms}^{-2}\))
| 1. | \(2~\text{ms}^{-2}\) | 2. | zero |
| 3. | \(0.1~\text{ms}^{-2}\) | 4. | \(1~\text{ms}^{-2}\) |
Subtopic: Tension & Normal Reaction |
73%
Level 2: 60%+
NEET - 2024
Hints
If the ratio of relative permeability and relative permittivity of a uniform medium is \(1 : 4.\) The ratio of the magnitudes of electric field intensity \((E)\) to the magnetic field intensity \((H)\) of an EM wave propagating in that medium is:\(\left(\text{Given that}\sqrt{\frac{\mu_0}{\varepsilon_0}}=120\pi\right)\)
| 1. | \(30\pi:1\) | 2. | \(1:120\pi\) |
| 3. | \(60\pi:1\) | 4. | \(120\pi:1\) |
Subtopic: Properties of EM Waves |
Level 3: 35%-60%
NEET - 2024
Hints
The value of the electric potential at a distance of \(9~\text{cm}\) from the point charge \(4\times10^{-7}~\text{C}\) is:
\(\left[\mathrm{Given}\dfrac{1}{4\pi\varepsilon_{0}}=9\times10^{9}~\text{N m}^{2}~\text{C}^{-2}\right]\)
\(\left[\mathrm{Given}\dfrac{1}{4\pi\varepsilon_{0}}=9\times10^{9}~\text{N m}^{2}~\text{C}^{-2}\right]\)
| 1. | \(4\times10^2~\text V\) | 2. | \(44.4~\text V\) |
| 3. | \(4.4\times10^5~\text V\) | 4. | \(4\times10^4~\text V\) |
Subtopic: Electric Potential |
78%
Level 2: 60%+
NEET - 2024
Hints
The displacement of a traveling wave is given by \(y=C\sin\dfrac{2\pi}{\lambda}({at}-x)\) where \(t\) is time, \(x\) is distance and \(\lambda\) is the wavelength, all in SI units. The frequency of the wave is:
| 1. | \(\dfrac{2\pi\lambda}{a}\) | 2. | \(\dfrac{2\pi a}{\lambda}\) |
| 3. | \(\dfrac{\lambda}{a}\) | 4. | \(\dfrac{a}{\lambda}\) |
Subtopic: Wave Motion |
79%
Level 2: 60%+
NEET - 2024
Hints
An object of mass \(100 ~\text{kg}\) falls from point \(A\) to \(B\) as shown in the figure. The change in its weight, corrected to the nearest integer (\(R_E\) is the radius of the Earth), is:
1. \(49~\text N\)
2. \(89~\text N\)
3. \(5~\text N\)
4. \(10~\text N\)
1. \(49~\text N\)
2. \(89~\text N\)
3. \(5~\text N\)
4. \(10~\text N\)
Subtopic: Acceleration due to Gravity |
60%
Level 2: 60%+
NEET - 2024
Hints
The potential energy of a particle moving along the \(x\text-\)direction varies as \({V}=\dfrac{{A}x^{2}}{\sqrt{x}+{B}}.\) The dimensions of \(\dfrac{A^2}{B}\) are:
| 1. | \([{M}^{3/2}{L}^{1/2}{T}^{-3}]\) | 2. | \([M^{1/2}LT^{-3}]\) |
| 3. | \([{M}^2{L}^{1/2}{T}^{-4}]\) | 4. | \([ML^{2}T^{-4}]\) |
Subtopic: Dimensions |
74%
Level 2: 60%+
NEET - 2024
Hints
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