NEET 2017

Figure shows a circuit that 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 \(\varepsilon = 18V\). The current \(i\) th...

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 'A' will be e...

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is

A capacitor is charged by a battery. The battery is removed and another identical unchanged capacitor is connected in parallel. The total electrostatic energy of resulting system

Which of the following statements are correct ?
(1)   Centre of mass of a body always coincides with the centre of gravity of the body.
(2)   Centre of mass of a body is the point at which the total gravitational torque on the body is zero...

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

A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves

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 \(\times\) ...

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is

A long solenoid of diameter 0.1 m has 2 \(\times\) 104 turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at...

In an electromagnetic wave in free space that root mean square value of the electric field is Erms = 6 V m\(-\)1. The peak value of the magnetic field is

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 (musch great...

The diagrams below show regions of equipotentials.

A positive charge is moved from A to B in each diagram.

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small...

A thin prism having refracting angle 10o is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting ang...

Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will

The acceleration due to gravity at a height at a height 1 km above the rearth is the same as at a depth d below the surface of earth. Then

A gas mixture consists of 2 moles of O2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

A carnot engine having an efficiency of \({1 \over {10}}\) as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

Thermodynamic processes are indicated in the following diagram.

Match the following

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Two blocks A and B of masses 3m and 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 s...

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 '\(\upsilon\)', the net force on the particle ...

If \(\theta\)1 and \(\theta\)2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip \(\theta\) is given by

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 180o against the torque is

The x and y coordinates of the particle at any time are x = 5t \(-\) 2t2 and y = 10t respectively, where x and y are in metres and t in seconds. The acceleration of the particle at t = 2 s is

Preeti reached the metro station and found that the escalator was not working. She walked up the sationary escalator in time t1. On another days, if she remains stationary on the the moving escalator, then the escalator takes her up in t...

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current \('I'\) along the same direction as shown in fogure. Magnitude of force per unit length on the middle wire \('B'\) is given by

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

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 second is

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 wate...

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite will be

The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'P', the fractional decrease in radius is

A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be

A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N?

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 coi...

The given electrical network is equivalent to

Which one of the following represents forward bias diode ?

In a common emitter transistor amplifier the audio sgnal 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...

A physical quantity of the dimensions of length that can be formed out of c, G and \({{{e^2}} \over {4\pi {\varepsilon _0}}}\) is [c is velocity of light, G is the universal constant of gravitation and e is charge]

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly

The ratio of resolving powers of an optical microscope for two wavelength \(\lambda\)1 = 4000 \(\mathop A\limits^ \circ\) and \({\lambda _2}\) = 6000 \(\mathop A\limits^ \circ\) is

Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light \(I\)0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45o with that of P1. The intensit...

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?

Two cars moving in opposite directions approach each other with speed of 22 m s\(-\)1 and 16.5 m s\(-\)1 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 i...

Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m s\(-\)1. Take 'g' constant with a value 10 m s\(-\)2. The work done by the (i) gravitational force and the (ii) resistive ...