NEET 2013

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices \(\mu\)1 and \(\mu\)2 and R is the radius of curvature of the cur...

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1 m, 2 m, 4 m, 8 m, . . . , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be

A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \({{{C_p}} \over {{C_p}}}\) for the gas is

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T1K to T2K is

In the given (V \(-\) T) diagram, what is the relation between pressure P1 and P2?

A gas is taken through the cycle
A \(\to\) B \(\to\) C \(\to\) A, as shown. what is the net work done by the gas?

Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upwards at constant speed v. What is the net force on the block of mass 2m ? (g is the ac...

The upper half of an inclined plane of inclination \(\theta\) is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between t...

A bar magnet of length \('l'\) and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

A current loop in a magnetic field

The velocity of a projectile at the initial point A is \(\left( {2\widehat i + 3\widehat j} \right)\) m/s. It's velocity (in m/s) at point B is

A stone falls freely under gravity. It covers distances h1, h2 and h3 in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between h1, h2 and h3 is

When a proton is released from rest in a room, it starts with an initial acceleration \(a\)0 towards west. When it is projected towards north with a speed \(v\)0 it moves with an initial acceleration 3\(a\)0 towards west. The an initial acc...

The wettability of a surface by a liquid depends primarily on

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If  \(\gamma\) = \({{{C_p}} \over {{C_v}}}\) and R is the universal gas constant, then Cv is equal to

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is

A small object of uniform density rolls up a curved surface with an initial velocity 'v'. It reaches upto a maximum height of \({{3{v^2}} \over {4g}}\) with respect to the initial position. The object is

The output (X) of the logic circuit shown ion figure will be

In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the ...

In a n-type semiconductor, which of the following statement is true.

If an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively.
Quantity P is calculated as follows P \(= {{{a^3}{b^2}} \over {cd}}\) % error in P is

In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths \({\lambda _1}\) = 12000 \(\mathop A\limits^ \circ\) and \({\lambda _2}\) = 10000 \(\mathop A\limits^ \circ\). At what minimum...

A wave travelling in the + ve x-direction having displacement along y-direction as 1 m, wavelength 2\(\pi\) m and frequency of \({1 \over \pi }\) Hz is represented by

A source of unknown frequency gives 4 beats/s when sounded with a source of known frquency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unkno...

If we study the vibration of a pipe open at both ends. then the following statement is not true.

A uniform force of \(\left( {3\widehat i + \widehat j} \right)\) newton acts on a particle of mass 2 kg. Hence the particle is displaced from position \(\left( {2\widehat i + \widehat k} \right)\) metre to position $$\left( {4\widehat i + 3...