Q.1
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F., because the method involves :
  • Cells
  • Potential gradients
  • A condition of no current flow through the galvanometer
  • A combination of cells, galvanometer and resistances
Q.2
A gas mixture consists of 2 moles of \(O_2\) and 4 moles of \(Ar\) at temperature \(T\). Neglecting all vibrational modes, the total internal energy of the system is
  • \(4RT\)
  • \(15 RT\)
  • \(9RT\)
  • \(11RT\)
Q.3
Radioactive material \(A\) has a decay constant \(8\lambda\) and material \(B\) has a decay constant \(8\lambda\). Initially, they have the same number of nuclei. After what time, the ratio of number of nuclei of material \(B\) to that \(A\) will be \(\frac{1}{e}\)
  • \(\frac{1}{\lambda}\)
  • \(\frac{1}{7\lambda}\)
  • \(\frac{1}{8\lambda}\)
  • \(\frac{1}{9\lambda}\)
Q.4
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 mm above the water level on the other side. Meanwhile, the water rises by 65 mm from its original level (see diagram). The density of the oil is
neet2017-phy-ques-4.png
  • \(650\,\,kg\,\,m^{-3}\)
  • \(425\,\,kg\,\,m^{-3}\)
  • \(800\,\,kg\,\,m^{-3}\)
  • \(928\,\,kg\,\,m^{-3}\)
Q.5
A 250-Turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of \(85 \mu A\) and subjected to a magnetic field of strength \(0.85 T\). Work done for rotating the coil by \(180^{\circ}\) against the torque is
  • \(9.1\mu J\)
  • \(4.55\mu J\)
  • \(2.3\mu J\)
  • \(1.15\mu J\)
Q.6
The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature \(T\) (Kelvin) and mass \(m\), is
  • \(\frac{h}{\sqrt{mkT}}\)
  • \(\frac{h}{\sqrt{3mkT}}\)
  • \(\frac{2h}{\sqrt{3mkT}}\)
  • \(\frac{2h}{\sqrt{mkT}}\)
Q.7
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 center) will be (\(T\) represents the tension in the string)
  • \(T\)
  • \(T+\frac{mv^2}{l}\)
  • \(T-\frac{mv^2}{l}\)
  • zero
Q.8
Figure shows a circuit contains three identical resistors with resistance \(R = 9.0 \Omega\) each, two identical inductors with inductance \(L = 2.0\,\, mH\) each, and an ideal battery with emf \(\epsilon = 18 V\). The current \(i\) through the battery just after the switch closed is
neet2017-phy-ques-8.png
  • 2 mA
  • 0.2 A
  • 2 A
  • 0 ampere
Q.9
The x and y coordinates of the particle at any time are \(x = 5t – 2t^2\) and \(y = 10t\) respectively, where \(x\) and \(y\) are in meters and \(t\) in seconds. The acceleration of the particle at \(t = 2 s\) is
  • 0
  • \(5 m/s^2 \)
  • \(-4 m/s^2 \)
  • \(-8 m/s^2 \)
Q.10
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 \(m_h = 1.67 \times 10^{–27} kg\)]
  • \(10^{ –20} C\)
  • \(10^{ –23} C\)
  • \(10^{ –37} C\)
  • \(10^{ –47} C\)
Q.11
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
neet2017-phy-ques-11.png
  • \(\frac{K_1+K_2}{2}\)
  • \(\frac{3\left( K_1+K_2 \right)}{2}\)
  • \(K_1+K_2\)
  • \(2(K_1+K_2)\)
Q.12
The diagrams below show regions of equipotentials. A positive charge is moved from A to B in each diagram
neet2017-phy-ques-12.png
  • Maximum work is required to move q in figure (c).
  • In all the four cases the work done is the same.
  • Minimum work is required to move q in figure (a).
  • Maximum work is required to move q in figure (b).
Q.13
Young’s double-slit experiment is first performed in air and then in a medium other than air. It is found that \(8^{th}\) bright fringe in the medium lies where \(5^{th}\) dark fringe lies in the air. The refractive index of the medium is nearly
  • 1.25
  • 1.59
  • 1.69
  • 1.78
Q.14
A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is
  • \(\frac{\sqrt{5}}{\pi}\)
  • \(\frac{\sqrt{5}}{2\pi}\)
  • \(\frac{4\pi}{\sqrt{5}}\)
  • \(\frac{2\pi}{\sqrt{3}}\)
Q.15
Thermodynamic processes are indicated in the following diagram.
neet2017-physics-16.png
neet2017-physics-16-1.png
  • P - a, Q - c, R - d, S - b
  • P - c, Q - a, R - d, S - b
  • P - c, Q - d, R - b, S - a
  • P - d, Q - b, R - a, S - c
Q.16
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 the resulting system
  • Increases by a factor of 4
  • Decreases by a factor of 2
  • Remains the same
  • Increases by a factor of 2
Q.17
The photoelectric threshold wavelength of silver is \(3250 \times 10^{–10} m\). The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength \(2536 \times 10^{–10} m\) is (Given \(h = 4.14 \times 10^{–15} eVs\) and \(c = 3 \times 10^{8} ms –1\) )
  • \(\approx 0.6 \times 10^5 ms^{-1}\)
  • \(\approx 0.6 \times 10^6 ms^{-1}\)
  • \(\approx 61 \times 10^3 ms^{-1}\)
  • \(\approx 0.3 \times 10^6 ms^{-1}\)
Q.18
A physical quantity of the dimensions of length that can be formed out of \(c\), \(G\) and \(\frac{e^2}{4\pi \epsilon_0}\) is [\(c\) is velocity of light, \(G\) is universal constant of gravitation and \(e\) is charge]
  • \(\frac{1}{c^2}\left[ G\frac{e^2}{4\pi \varepsilon _0} \right] ^{1/2}\)
  • \(c^2\left[ G\frac{e^2}{4\pi \varepsilon_0} \right] ^{1/2}\)
  • \(\frac{1}{c^2}\left[ \frac{e^2}{G4\pi \varepsilon_0} \right] ^{1/2}\)
  • \(\frac{1}{c}G\frac{e^2}{4\pi \varepsilon_0}\)
Q.19
Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]
  • 350 Hz
  • 361 Hz
  • 411 Hz
  • 448 Hz
Q.20
In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is \(3 K\Omega\). If current gain is 100 and the base resistance is \(2 K\Omega\), the voltage and power gain of the amplifier is
  • 200 and 1000
  • 15 and 200
  • 150 and 15000
  • 20 and 2000
0 h : 0 m : 1 s