Recent questions tagged jeemain 2016 physics set c 10042016

To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are:

asked Jun 2, 2017 by priyanka.c

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The ratio $(R)$ of output resistance $r_0$, and the input resistance $r_i$ in measurements of input and output characteristics of a transistor is typically in the range :

asked May 25, 2017 by priyanka.c

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A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a commonemitter transistor configuration is :

asked May 25, 2017 by priyanka.c

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A galvanometer has a $50$ division scale. Battery has no internal resistance. It is found that there is deflection of $40$ divisions when $R=2400 Ω$. Deflection becomes $20$ divisions when resistance taken from resistance box is $4900 Ω$. Then we can conclude :

asked May 25, 2017 by priyanka.c

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A thin $1 m$ long rod has a radius of $5 mm$. A force of $50 πkN$ is applied at one end to determine its Young’s modulus. Assume that the force is exactly known. If the least count in the measurement of all lengths is $0.01 mm$, which of the following statements is false ?

asked May 25, 2017 by priyanka.c

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A particle of mass m is acted upon by a force $F$ given by the empirical law $F = \frac{R}{t^2} v(t)$. If this law is to be tested experimentally by observing the motion starting from rest, the best way is to plot :

asked May 25, 2017 by priyanka.c

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A modulated signal $C_m(t)$ has the form $C_m(t)=30 \; \sin \; 300πt+10\; (cos 200πt −\cos 400πt)$. The carrier frequency $f_c$, the modulating frequency (message frequency) $f_ω$, and the modulation index $µ$ are respectively given by :

asked May 25, 2017 by priyanka.c

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To get an output of 1 from the circuit shown in figure the input must be :

asked May 25, 2017 by priyanka.c

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A neutron moving with a speed ‘v’ makes a head on collision with a stationary hydrogen atom in ground state. The minimum kinetic energy of the neutron for which inelastic collision will take place is

asked May 25, 2017 by priyanka.c

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A photoelectric surface is illuminated successively by monochromatic light of wavelengths $ λ$ and $\frac{λ}{2}$. If the maximum kinetic energy of the emitted photoelectrons in the second case is $3\; times $ that in the first case, the work function of the surface is :

asked May 25, 2017 by priyanka.c

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Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30cm. The wavelength of light 600 nm. To see the stars just resolved by the telescope, the minimum distance between them should be (1 light year = $9.46 \times 10^{15} m$) of the order of :

asked May 24, 2017 by priyanka.c

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A hemispherical glass body of radius $10 cm$ and refractive index $1.5$ is silvered on its curved surface. A small air bubble is $6 cm$ below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen:

asked May 24, 2017 by priyanka.c

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Consider an electromagnetic wave propagating in vacuum. Choose the correct statement :

asked May 24, 2017 by priyanka.c

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A conducting metal circular-wire-loop of radius $r$ is placed perpendicular to a magnetic field which varies with time as $B = B_0 e^{-t/τ} $= , where $B_0$ and $τ$ are constants, at time $t=0$. If the resistance of the loop is $R$ then the heat generated in the loop after a long time $( t →\propto)$ is :

asked May 24, 2017 by priyanka.c

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A fighter plane of length $20 m$, wing span (distance from tip of one wing to the tip of the other wing) of $15 m$ and height $5 m$ is flying towards east over Delhi. Its speed is $240 ms^{−1}$. The earth’s magnetic field over Delhi is $5×10^{−5} T$ with the declination angle $~0^0$ and dip of $θ$ such that $\sin θ = \frac{2}{3}$. If the voltage developed is $V_B$ between the lower and upper side of the plane and $V_W$ between the tips of the wings then $V_B$ and $V_W$ are close to :

asked May 24, 2017 by priyanka.c

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Consider a thin metallic sheet perpendicular to the plane of the paper moving with speed $'v'$ in a uniform magnetic field B going into the plane of the paper (see figure) . If charge densities $\sigma _1$ and $\sigma_2$ are induced on the left and right surfaces, respectively, of the sheet then (ignore fringe effects) :

asked May 24, 2017 by priyanka.c

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The resistance of an electrical toaster has a temperature dependence given by $ R(T)=R_0 [1+α(T−T_0)] $ in its range of operation. At $T_0=300 K, R=100 Ω $and at$ T=500 K, R=120 Ω$. The toaster is connected to a voltage source at $200 V$ and its temperature is raised at a constant rate from $300$ to $ 500 K$ in $30 s$. The total work done in raising the temperature is

asked May 23, 2017 by priyanka.c

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Figure shows a network of capacitors where the numbers indicates capacitances in micro Farad. The value of capacitance $C$ if the equivalent capacitance between point $A$ and $B$ is to be $1 µF$ is :

asked May 23, 2017 by priyanka.c

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Within a spherical charge distribution of charge density $ρ(r), N $ equipotential surfaces of potential $V_0, V0+∆V, V_0+2∆V, .......... V_0+N∆V (∆V>0)$, are drawn and have increasing radii$ r_0, r_1, r_2,..........r_N$, respectively. If the difference in the radii of the surfaces is constant for all values of $V_0$ and $∆V$ then :

asked May 23, 2017 by priyanka.c

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A toy-car, blowing its horn, is moving with a steady speed of $5 m/s$, away from a wall. An observer, towards whom the toy car is moving, is able to hear $5$ beats per second. If the velocity of sound in air is $340 m/s$, the frequency of the horn of the toy car is close to :

asked May 23, 2017 by priyanka.c

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In an engine the piston undergoes vertical simple harmonic motion with amplitude $7 cm$. A washer rests on top of the piston and moves with it. The motor speed is slowly increased. The frequency of the piston at which the washer no longer stays in contact with the piston, is close to :

asked May 23, 2017 by priyanka.c

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Which of the following shows the correct relationship between the pressure $‘P’$ and density $ρ$ of an ideal gas at constant temperature ?

asked May 23, 2017 by priyanka.c

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A, B, C and D are four different physical quantities having different dimensions. Now of them is dimensionless. But we know that the equation AD = C in (BD) holds true. Then which of the combination is not a meaningful quantity ?

asked May 22, 2017 by priyanka.c

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