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Physics · PYQ NEET UG 2019(2)
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Physics · PYQ NEET UG 2019(2)
A person travelling in a straight line moves with a constant velocity \( v_1 \) for certain distance 'x' and with a constant velocity \( v_2 \) for next equal distance. The average velocity v is given by the relation
Read answer →Physics · PYQ NEET UG 2019(2)
A deep rectangular pond of surface area \( A \), containing water (density = \( \rho \), specific heat capacity = \( s \)), is located in a region where the outside air temperature is at a steady value of \( -26^\circ\text{C} \). The thickness of the frozen ice layer in this pond, at a certain instant is \( x \). Taking the thermal conductivity of ice as \( K \), and its specific latent heat of fusion as \( L \), the rate of increase of the thickness of ice layer, at this instant, would be given by
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The value of \( \gamma = \frac{C_p}{C_v} \) for hydrogen, helium and another ideal diatomic gas \( X \) (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to,
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The main scale of a vernier callipers has \( n \) divisions/cm. \( n \) divisions of the vernier scale coincide with \( (n - 1) \) divisions of main scale. The least count of the vernier callipers is,
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A particle of mass \( 5m \) at rest suddenly breaks on its own into three fragments. Two fragments of mass \( m \) each move along mutually perpendicular direction with speed \( v \) each. The energy released during the process is,
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A circuit when connected to an AC source of \( 12\text{ V} \) gives a current of \( 0.2\text{ A} \). The same circuit when connected to a DC source of \( 12\text{ V} \), gives a current of \( 0.4\text{ A} \). The circuit is
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The metre bridge shown is in balance position with \( \frac{P}{Q} = \frac{l_1}{l_2} \). If we now interchange the positions of galvanometer and cell, will the bridge work? If yes, what will be balance condition?
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A straight conductor carrying current \( i \) splits into two parts as shown in the figure. The radius of the circular loop is \( R \). The total magnetic field at the centre \( P \) of the loop is,
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\( 1 \text{ g} \) of water, of volume \( 1 \text{ cm}^3 \) at \( 100^{\circ}\text{C} \), is converted into steam at same temperature under normal atmospheric pressure \( (= 1 \times 10^5 \text{ Pa}) \). The volume of steam formed equals \( 1671 \text{ cm}^3 \). If the specific latent heat of vaporisation of water is \( 2256 \text{ J/g} \), the change in internal energy is,
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The work function of a photosensitive material is \( 4.0 \text{ eV} \). The longest wavelength of light that can cause photon emission from the substance is (approximately)
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The radius of the first permitted Bohr orbit, for the electron, in a hydrogen atom equals \( 0.51 \text{ \AA} \) and its ground state energy equals \( -13.6 \text{ eV} \). If the electron in the hydrogen atom is replaced by muon (\( \mu^- \)) [charge same as electron and mass \( 207 \text{ m}_e \)], the first Bohr radius and ground state energy will be,
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An LED is constructed from a p-n junction diode using GaAsP. The energy gap is \( 1.9\text{ eV} \). The wavelength of the light emitted will be equal to
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A body of mass \( m \) is kept on a rough horizontal surface (coefficient of friction = \( \mu \)). A horizontal force is applied on the body, but it does not move. The resultant of normal reaction and the frictional force acting on the object is given by \( F \), where \( F \) is,
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The time period of a geostationary satellite is \( 24\text{ h} \), at a height \( 6R_E \) (\( R_E \) is radius of earth) from surface of earth. The time period of another satellite whose height is \( 2.5 R_E \) from surface will be,
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Assuming that the gravitational potential energy of an object at infinity is zero, the change in potential energy (final - initial) of an object of mass \( m \), when taken to a height \( h \) from the surface of earth (of radius \( R \)), is given by,
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A proton and an \( \alpha \)-particle are accelerated from rest to the same energy. The de Broglie wavelengths \( \lambda_p \) and \( \lambda_\alpha \) are in the ratio,
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The relations amongst the three elements of earth's magnetic field, namely horizontal component \( H \), vertical component \( V \) and dip \( \delta \) are, (\( B_E = \text{total magnetic field} \))
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A tuning fork with frequency \( 800\text{ Hz} \) produces resonance in a resonance column tube with upper end open and lower end closed by water surface. Successive resonance are observed at lengths \( 9.75\text{ cm} \), \( 31.25\text{ cm} \) and \( 52.75\text{ cm} \). The speed of sound in air is,
Read answer →Physics · PYQ NEET UG 2019(2)
A double convex lens has focal length \( 25\text{ cm} \). The radius of curvature of one of the surfaces is double of the other. Find the radii if the refractive index of the material of the lens is \( 1.5 \).
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A body of mass \( m \) with initial momentum \( (20\hat{i} + 25\hat{j} - 12\hat{k}) \) suddenly breaks into two pieces whose masses are in the ratio \( 1 : 5 \). The smaller mass flies off with a velocity \( (100\hat{i} + 35\hat{j} + 8\hat{k}) \). The velocity of the larger piece will be,
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A person standing on the floor of an elevator drops a coin. The coin reaches the floor in time \( t_1 \) if the elevator is at rest and in time \( t_2 \) if the elevator is moving uniformly. Then
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The circuit diagram shown here corresponds to the logic gate,
Read answer →Physics · PYQ NEET UG 2019(2)
