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Physics · PYQ NEET UG 2017
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Physics · PYQ NEET UG 2017
A spring of force constant \( k \) is cut into lengths of ratio \( 1:2:3 \). They are connected in series and the new force constant is \( k' \). Then they are connected in parallel and force constant is \( k'' \). Then \( k' : k'' \) is
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The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'P', the fractional decrease in radius is
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Two cars moving in opposite directions approach each other with speed of \( 22\text{ m/s} \) and \( 16.5\text{ m/s} \) respectively. The driver of the first car blows a horn having a frequency \( 400\text{ Hz} \). The frequency heard by the driver of the second car is (velocity of sound \( 340\text{ m/s} \))
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A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves
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The given electrical network is equivalent to
Read answer →Physics · PYQ NEET UG 2017
निम्नलिखित में से कौन सा अग्र अभिनत (forward bias) डायोड को दर्शाता है?
Read answer →Physics · PYQ NEET UG 2017
The diagrams below show regions of equipotentials. A positive charge is moved from A to B in each diagram. (a) Maximum work is required to move q in figure (c). (b) In all the four cases the work done is the same. (c) Minimum work is required to move q in figure (a). (d) Maximum work is required to move q in figure (b).
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A Carnot engine having an efficiency of \( \frac{1}{10} \) as heat engine, is used as a refrigerator. If the work done on the system is \( 10\text{ J} \), the amount of energy absorbed from the reservoir at lower temperature is:
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Figure shows a circuit that contains three identical resistors with resistance \( R = 9.0\;\Omega \) each, two identical inductors with inductance \( L = 2.0\text{ mH} \) each, and an ideal battery with emf \( E = 18\text{ V} \). The current 'i' through the battery just after the switch closed is
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A rope is wound around a hollow cylinder of mass \( 3\text{ kg} \) and radius \( 40\text{ cm} \). What is the angular acceleration of the cylinder if the rope is pulled with a force of \( 30\text{ N} \)?
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A U tube with both ends open to the atmosphere is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of \( 10\text{ mm} \) above the water level on the other side. Meanwhile the water rises by \( 65\text{ mm} \) from its original level (see diagram). The density of the oil is:
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The ratio of resolving powers of an optical microscope for two wavelengths \( \lambda_1 = 4000\text{ \AA} \) and \( \lambda_2 = 6000\text{ \AA} \) is
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Radioactive material 'A' has decay constant \( 8\lambda \) and material 'B' has decay constant \( \lambda \). Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that of 'A' will be \( \frac{1}{e} \)?
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Two polaroids \( P_1 \) and \( P_2 \) are placed with their axis perpendicular to each other. Unpolarised light \( I_0 \) is incident on \( P_1 \). A third polaroid \( P_3 \) is kept in between \( P_1 \) and \( P_2 \) such that its axis makes an angle \( 45^\circ \) with that of \( P_1 \). The intensity of transmitted light through \( P_2 \) is:
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A particle executes linear simple harmonic motion with amplitude of \( 3\text{ cm} \). When the particle is at \( 2\text{ cm} \) from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is
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The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is
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The photoelectric threshold wavelength of silver is \( 3250 \times 10^{-10}\text{ m} \). The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength \( 2536 \times 10^{-10}\text{ m} \) is: (Given: \( h = 4.14 \times 10^{-15}\text{ eVs} \) and \( c = 3 \times 10^8\text{ ms}^{-1} \))
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Thermodynamics processes are indicated in the following diagram. Match the following: Column-I p. Process I q. Process II r. Process III s. Process IV Column-II a. Adiabatic b. Isobaric c. Isochoric d. Isothermal Options: (A) \( p \rightarrow a,\; q \rightarrow c,\; r \rightarrow d,\; s \rightarrow b \) (B) \( p \rightarrow c,\; q \rightarrow a,\; r \rightarrow d,\; s \rightarrow b \) (C) \( p \rightarrow c,\; q \rightarrow d,\; r \rightarrow b,\; s \rightarrow a \) (D) \( p \rightarrow d,\; q \rightarrow b,\; r \rightarrow a,\; s \rightarrow c \)
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Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities \( \omega_1 \) and \( \omega_2 \). They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is:
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Suppose the charge of a proton and an electron differ slightly. One of them is \( -e \), the other is \( (e + \Delta e) \). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then \( \Delta e \) is of the order of [Given mass of hydrogen \( m_h = 1.67 \times 10^{-27}\text{ kg} \)]
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A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system
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Young's double slit experiment is first performed in air and then in a medium other than air. It is found that \( 8^{\text{th}} \) bright fringe in the medium lies where \( 5^{\text{th}} \) dark fringe lies in air. The refractive index of the medium is nearly:
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