A siren emitting a sound of frequency \(800\) Hz moves away from an observer towards a cliff at a speed of \(15\) ms-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is:
(Take, the velocity of sound in air = \(330\) ms-1)
1. \(800\) Hz
2. \(838\) Hz
3. \(885\) Hz
4. \(765\) Hz
64%
Level 2: 60%+
NEET - 2016
Hints
Links
A body of mass \(1~\text{kg}\) begins to move under the action of a time-dependent force \(\vec{F}=\left(2 t \hat{i}+3 t^2 \hat{j}\right) \text N,\) where \(\hat{i}\) and are unit vectors along the \({X}\) and \({Y}\text-\)axis. What power will be developed by the force at the time \((t)? \)
| 1. | \(\left(2 t^2+4 t^4\right)\text W\) | 2. | \(\left(2 t^3+3 t^3\right) \text W \) |
| 3. | \(\left(2 t^3+3 t^5\right) \text W\) | 4. | \(\left(2 t^3+3 t^4\right) \text W\) |
Subtopic: Power |
80%
Level 1: 80%+
NEET - 2016
Hints
Links
From a disc of radius \(R\) and mass \(M,\) a circular hole of diameter \(R,\) whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis, passing through the centre?
| 1. | \(\dfrac{13}{32}MR^2\) | 2. | \(\dfrac{11}{32}MR^2\) |
| 3. | \(\dfrac{9}{32}MR^2\) | 4. | \(\dfrac{15}{32}MR^2\) |
Subtopic: Moment of Inertia |
60%
Level 2: 60%+
NEET - 2016
Hints
Links
In a diffraction pattern due to a single slit of width \(a\), the first minimum is observed at an angle of \(30^{\circ}\) when the light of wavelength \(5000~\mathring{A}\) is incident on the slit. The first secondary maximum is observed at an angle of:
1. \(\sin^{-1}\frac{2}{3}\)
2. \(\sin^{-1}\frac{1}{2}\)
3. \(\sin^{-1}\frac{3}{4}\)
4. \(\sin^{-1}\frac{1}{4}\)
1. \(\sin^{-1}\frac{2}{3}\)
2. \(\sin^{-1}\frac{1}{2}\)
3. \(\sin^{-1}\frac{3}{4}\)
4. \(\sin^{-1}\frac{1}{4}\)
Subtopic: Diffraction |
70%
Level 2: 60%+
NEET - 2016
Hints
If a square loop \({ABCD}\) carrying a current \(i\) is placed near and coplanar with a long straight conductor \({XY}\) carrying a current \(I,\) what will be the net force on the loop?
| 1. | \(\dfrac{\mu_0Ii}{2\pi}\) | 2. | \(\dfrac{2\mu_0IiL}{3\pi}\) |
| 3. | \(\dfrac{\mu_0IiL}{2\pi}\) | 4. | \(\dfrac{2\mu_0Ii}{3\pi}\) |
Subtopic: Current Carrying Loop: Force & Torque |
64%
Level 2: 60%+
NEET - 2016
Hints
Links
A black body is at a temperature of \(5760~\text{K}.\) The energy of radiation emitted by the body at wavelength \(250~\text{nm}\) is \(U_1,\) at wavelength \(500~\text{nm}\) is \(U_2\) and that at \(1000~\text{nm}\) is \(U_3.\) Wien’s constant, \(b=2.88 \times 10^6~ \text{nm-K}.\) Which of the following is correct?
1. \({U}_3 =0 \)
2. \({U}_1 >{U}_2 \)
3. \({U}_2 >{U}_1 \)
4. \({U}_1 =0\)
1. \({U}_3 =0 \)
2. \({U}_1 >{U}_2 \)
3. \({U}_2 >{U}_1 \)
4. \({U}_1 =0\)
Subtopic: Wien's Displacement Law |
61%
Level 2: 60%+
NEET - 2016
Hints
Links
An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is \(50~\text{cm}.\) The next larger length of the column resonating with the same tuning fork will be:
| 1. | \(100~\text{cm}\) | 2. | \(150~\text{cm}\) |
| 3. | \(200~\text{cm}\) | 4. | \(66.7~\text{cm}\) |
Subtopic: Standing Waves |
80%
Level 1: 80%+
NEET - 2016
Hints
Links
The molecules of a given mass of gas have RMS velocity of \(200~\text{ms}^{-1}\) at \(27^\circ \text{C}\) and \(1.0\times 10^{5}~\text{Nm}^{-2}\) pressure. When the temperature and the pressure of the gas are respectively, \(127^\circ \text{C}\) and \(0.05\times10^{5}~\text{Nm}^{-2},\) the RMS velocity of its molecules in \((\text{ms}^{-1})\) is:
| 1. | \(\dfrac{400}{\sqrt{3}}\) | 2. | \(\dfrac{100\sqrt{2}}{3}\) |
| 3. | \(\dfrac{100}{3}\) | 4. | \(100\sqrt{2}\) |
Subtopic: Types of Velocities |
83%
Level 1: 80%+
NEET - 2016
Hints
Links
Consider the junction diode as an ideal. The value of current flowing through \(AB\) is:
1. \(10^{-2}~\text{A}\)
2. \(10^{-1}~\text{A}\)
3. \(10^{-3}~\text{A}\)
4. \(0~\text{A}\)
Subtopic: PN junction |
79%
Level 2: 60%+
NEET - 2016
Hints
If the magnitude of the sum of two vectors is equal to the magnitude of the difference between the two vectors, the angle between these vectors is?
1. \(90^\circ\)
2. \(45^\circ\)
3. \(180^\circ\)
4. \(0^\circ\)
1. \(90^\circ\)
2. \(45^\circ\)
3. \(180^\circ\)
4. \(0^\circ\)
Subtopic: Resultant of Vectors |
80%
Level 1: 80%+
NEET - 2016
Hints
Links
© 2026 GoodEd Technologies Pvt. Ltd.