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Physics · PYQ NEET UG 2017
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Physics · PYQ NEET UG 2017
A spherical black body with a radius of \( 12\text{ cm} \) radiates \( 450\text{ watt} \) power at \( 500\text{ K} \). If the radius were halved and the temperature doubled, the power radiated in watt would be:
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Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will:
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Which of the following statements are correct? (A) Centre of mass of a body always coincides with the centre of gravity of the body. (B) Centre of mass of a body is the point at which the total gravitational torque on the body is zero. (C) A couple on a body produce both translational and rotational motion in a body. (D) Mechanical advantage greater than one means that small effort can be used to lift a large load.
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A thin prism having refracting angle \( 10^\circ \) is made of glass of refractive index \( 1.42 \). This prism is combined with another thin prism of glass of refractive index \( 1.7 \). This combination produces dispersion without deviation. The refracting angle of second prism should be
Read answer →Physics · PYQ NEET UG 2017
The acceleration due to gravity at a height \( 1\text{ km} \) above the earth is the same as at a depth d below the surface of earth. Then:
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The resistance of a wire is \( R \) ohm. If it is melted and stretched to \( n \) times its original length, its new resistance will be:-
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A physical quantity of the dimensions of length that can be formed out of \( c \), \( G \) and \( \frac{e^2}{4\pi\varepsilon_0} \) is [\( c \) is velocity of light, \( G \) is universal constant of gravitation and \( e \) is charge]:
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Consider a drop of rain water having mass \( 1\text{ g} \) falling from a height of \( 1\text{ km} \). It hits the ground with a speed of \( 50\text{ m/s} \). Take ' \( g \) ' constant with a value \( 10\text{ m/s}^2 \). The work done by the (i) gravitational force and the (ii) resistive force of air is:
Read answer →Physics · PYQ NEET UG 2017
The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature \( T \) (Kelvin) and mass \( m \), is:
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Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time \( t_1 \). On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time \( t_2 \). The time taken by her to walk up on the moving escalator will be:
Read answer →Physics · PYQ NEET UG 2017
Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are \( K_1 \) and \( K_2 \). The thermal conductivity of the composite rod will be:
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A long solenoid of diameter \( 0.1\text{ m} \) has \( 2 \times 10^4 \) turns per metre. At the centre of the solenoid, a coil of \( 100\text{ turns} \) and radius \( 0.01\text{ m} \) is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to \( 0\text{ A} \) from \( 4\text{ A} \) in \( 0.05\text{ s} \). If the resistance of the coil is \( 10\pi^2\;\Omega \), the total charge flowing through the coil during this time is:
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A gas mixture consists of 2 moles of \( \text{O}_2 \) and 4 moles of \( \text{Ar} \) at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
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An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current '\( I \)' along the same direction is shown in figure. Magnitude of force per unit length on the middle wire '\( B \)' is given by
Read answer →Physics · PYQ NEET UG 2017
The two nearest harmonics of a tube closed at one end and open at other end are \( 220\text{ Hz} \) and \( 260\text{ Hz} \). What is the fundamental frequency of the system?
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A \( 250 \)-turn rectangular coil of length \( 2.1\text{ cm} \) and width \( 1.25\text{ cm} \) carries a current of \( 85\text{ }\mu\text{A} \) and subjected to magnetic field of strength \( 0.85\text{ T} \). Work done for rotating the coil by \( 180^\circ \) against the torque is
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One end of string of length \( l \) is connected to a particle of mass \( m \) and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed \( v \), the net force on the particle (directed towards centre) will be (T represents the tension in the string)
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The x and y co-ordinates of the particle at any time are \( x = 5t - 2t^2 \) and \( y = 10t \) respectively, where x and y are in metres and t in seconds. The acceleration of the particle at \( t = 2\text{ s} \) is:
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Two blocks A and B of masses \( 3\text{m} \) and \( \text{m} \) respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively:
Read answer →Physics · PYQ NEET UG 2017
