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Physics · PYQ NEET UG 2018
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Physics · PYQ NEET UG 2018
The volume (\( V \)) of a monatomic gas varies with its temperature (\( T \)) as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state \( A \) to state \( B \), is
Read answer →Physics · PYQ NEET UG 2018
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?
Read answer →Physics · PYQ NEET UG 2018
A set of 'n' equal resistors, of value 'R' each, are connected in series to a battery of emf 'E' and internal resistance 'R'. The current drawn is I. Now, the 'n' resistors are connected in parallel to the same battery. Then the current drawn from battery becomes \( 10\text{ I} \). The value of 'n' is Which of the above statements is/are correct?
Read answer →Physics · PYQ NEET UG 2018
At what temperature will the r.m.s. speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere? (Given: Mass of oxygen molecule \( = 2.76 \times 10^{-26}\text{ kg} \), Boltzmann's constant \( k_{\text{B}} = 1.38 \times 10^{-23}\text{ J K}^{-1} \))
Read answer →Physics · PYQ NEET UG 2018
एक बैटरी में श्रेणीक्रम में जुड़े समान सेलों (प्रत्येक का आंतरिक प्रतिरोध 'r') की एक परिवर्तनशील संख्या 'n' होती है। बैटरी के टर्मिनलों को लघु-पथित (short-circuit) किया जाता है और धारा I मापी जाती है। कौन सा ग्राफ I और n के बीच सही संबंध को दर्शाता है?
Read answer →Physics · PYQ NEET UG 2018
A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be
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An object is placed at a distance of \( 40\text{ cm} \) from a concave mirror of focal length \( 15\text{ cm} \). If the object is displaced through a distance of \( 20\text{ cm} \) towards the mirror, the displacement of the image will be
Read answer →Physics · PYQ NEET UG 2018
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is
Read answer →Physics · PYQ NEET UG 2018
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is \( 20 \text{ m/s}^2 \) at a distance of \( 5 \text{ m} \) from the mean position. The time period of oscillation is
Read answer →Physics · PYQ NEET UG 2018
In a p-n junction diode, change in temperature due to heating
Read answer →Physics · PYQ NEET UG 2018
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
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A toy car with charge q is on a frictionless horizontal plane surface under the influence of a uniform electric field \( \vec{E} \). Due to the force \( q\vec{E} \), its velocity increases from 0 to \( 6\text{ m/s} \) in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
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An electron falls from rest through a vertical distance '\( h \)' in a uniform and vertically upward directed electric field '\( E \)'. The direction of the electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance '\( h \)'. The time of fall of the electron, in comparison to the time of fall of the proton is
Read answer →Physics · PYQ NEET UG 2018
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched ON, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from
Read answer →Physics · PYQ NEET UG 2018
In the combination of the following gates the output Y can be written in terms of inputs A and B as
Read answer →Physics · PYQ NEET UG 2018
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
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A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?
Read answer →Physics · PYQ NEET UG 2018
Unpolarised light is incident from air on a plane surface of a material of refractive index '\( \mu \)'. At a particular angle of incidence '\( i \)', it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
Read answer →Physics · PYQ NEET UG 2018
An electron of mass \( m \) with an initial velocity \( \vec{v} = v_0 \hat{i} \) (\( v_0 > 0 \)) enters an electric field \( \vec{E} = -E_0 \hat{i} \) (\( E_0 = \text{constant} > 0 \)) at \( t = 0 \). If \( \lambda_0 \) is its de-Broglie wavelength at time \( t \) is
Read answer →Physics · PYQ NEET UG 2018
The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are \( K_A \), \( K_B \) and \( K_C \), respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then
Read answer →Physics · PYQ NEET UG 2018
The magnetic potential energy stored in a certain inductor is \( 25\text{ mJ} \), when the current in the inductor is \( 60\text{ mA} \). This inductor is of inductance
Read answer →Physics · PYQ NEET UG 2018
A solid sphere is in rolling motion. In rolling motion, a body possesses translational kinetic energy (\( K_t \)) as well as rotational kinetic energy (\( K_r \)) simultaneously. The ratio \( K_t : (K_t + K_r) \) for the sphere is
Read answer →Physics · PYQ NEET UG 2018
