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Physics · PYQ NEET UG 2016(2)
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Physics · PYQ NEET UG 2016(2)
A filament bulb (\( 500\text{W}, 100\text{V} \)) is to be used in a \( 230\text{ V} \) main supply. When a resistance is connected in series, it works perfectly and the bulb consumes \( 500\text{ W} \). The value of R is
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If an electron in a hydrogen atom jumps from the \( 3^{\text{rd}} \) orbit to the \( 2^{\text{nd}} \) orbit, it emits a photon of wavelength \( \lambda \). When it jumps from the \( 4^{\text{th}} \) orbit to the \( 3^{\text{rd}} \) orbit, the corresponding wavelength of the photon will be
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Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at \( 100^\circ\text{C} \), while the other one is at \( 0^\circ\text{C} \). If the two bodies are brought into contact, then, assuming no heat loss, the final common temperature is
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An electron is moving in a circular path under the influence of a transverse magnetic field of \( 3.57 \times 10^{-2} \text{ T} \). If the value of \( e/m \) is \( 1.76 \times 10^{11} \text{ C/kg} \), the frequency of revolution of the electron is
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The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance \( R_1 \) will be
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Two identical glass (\( \mu_3 = 3/2 \)) equiconvex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water (\( \mu_w = 4/3 \)). The focal length of the combination is
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A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be
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For CE transistor amplifier, the audio signal voltage across the collector resistance of \( 2\text{ k}\Omega \) is \( 4\text{ V} \). If the current amplification factor of the transistor is \( 100 \) and the base resistance is \( 1\text{ k}\Omega \), then the input signal voltage is
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A \( 100\ \Omega \) resistance and a capacitor of \( 100\ \Omega \) reactance are connected in series across a \( 220\text{V} \) source. When the capacitor is \( 50\% \) charged, the peak value of the displacement current is
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Two cars P and Q start from a point at the same time in a straight line and their positions are represented by \( x_P(t) = at + bt^2 \) and \( x_Q(t) = ft - t^2 \). At what time do the cars have the same velocity?
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One mole of an ideal monatomic gas undergoes a process described by the equation \( PV^3 = \text{constant} \). The heat capacity of the gas during this process is
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A body of mass \( m \) is attached to the lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass \( m \) is slightly pulled down and released, it oscillates with a time period of \( 3 \text{ s} \). When the mass \( m \) is increased by \( 1 \text{ kg} \), the time period of oscillations becomes \( 5 \text{ s} \). The value of \( m \) in kg is
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Electrons of mass \( m \) with de-Broglie wavelength \( \lambda \) fall on the target in an X-ray tube. The cut-off wavelength (\( \lambda_0 \)) of the emitted X-ray is
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A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule of the gas is m. Which of the following gives the density of the gas?
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A person can see clearly objects only when they lie between \( 50\text{ cm} \) and \( 400\text{ cm} \) from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be
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What is the output \( Y \) in the following circuit, when all the three inputs \( A, B, C \) are first \( 0 \) and then \( 1 \)?
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An air bubble in a glass slab with refractive index \( 1.5 \) (near normal incidence) is \( 5 \text{ cm} \) deep when viewed from one surface and \( 3 \text{ cm} \) deep when viewed from the opposite face. The thickness (in cm) of the slab is
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A solid sphere of mass m and radius R is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation (\( E_{\text{sphere}}/E_{\text{cylinder}} \)) will be
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The temperature inside a refrigerator is \( t_2\ ^\circ\text{C} \) and the room temperature is \( t_1\ ^\circ\text{C} \). The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be
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The potential difference \( (V_A - V_B) \) between the points A and B in the given figure is
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Two identical balls A and B having velocities of \( 0.5\text{ m/s} \) and \( -0.3\text{ m/s} \) respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be
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A rigid ball of mass m strikes a rigid wall at \( 60^\circ \) and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be
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