AIEEE 2002

In a transformer, number of turns in the primary coil are \(140\) and that in the secondary coil are \(280.\) If current in primary coil is \(4A,\) then that in the secondary coil is

The power factor of \(AC\) circuit having resistance \((R)\) and inductance \((L)\) connected in series and an angular velocity \(\omega\) is

If \({N_0}\) is the original mass of the substance of half-life period \({t_{1/2}} = 5\) years, then the amount of substance left after \(15\) years is

At a specific instant emission of radioactive compound is deflected in a magnetic field. The compound can emit
$$\eqalign{
& \left( i \right)\,\,\,\,\,\,\,electrons\,\,\,\,\,\,\,\,\,\,\,\,\left( {ii} \right)\,\,\,\,\,\,\,protons \cr
...

If \(13.6\) \(eV\) energy is required to ionize the hydrogen atom, then the energy required to remove an electron from \(n=2\) is

Capacitance (in \(F\)) of a spherical conductor with radius \(1\) \(m\) is

If there are \(n\) capacitors in parallel connected to \(V\) volt source, then the energy stored is equal to

Two identical particles move towards each other with velocity \(2v\) and \(v\) respectively. The velocity of center of mass is

The minimum velocity (in \(m{s^{ - 1}}\)) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction \(0.6\) to avoid skidding is

A wire when connected to \(220\) \(V\) mains supply has power dissipation \({P_1}.\) Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is \({P_2}.\) Then $${P_2}:{P_...

If in the circuit, power dissipation is \(150W,\) then \(R\) is

If \({\theta _1},\) is the inversion temperature, \({\theta _n}\) is the neutral temperature, \({\theta _c}\) is the temperature of the cold junction, then

The mass of product liberated on anode in an electrochemical cell depends on (where \(t\) is the time period for which the current is passed).

If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a

Formation of covalent bonds in compounds exhibits

Sodium and copper have work functions \(2.3\) \(eV\) and \(4.5\) \(eV\) respectively. Then the ratio of the wavelengths is nearest to

A conducting square loop of side \(L\) and resistance \(R\) moves in its plane with a uniform velocity \(v\) perpendicular to one of its sides. A magnetic induction \(B\) constant in time and space, pointing perpendicular and into the plane...

The inductance between \(A\) and \(D\) is

Which of the following are not electromagnetic waves?

Electromagnetic waves are transverse in nature is evident by

At absolute zero, Si acts as

By increasing the temperature, the specific resistance of a conductor and a semiconductor

The part of a transistor which is most heavily doped to produce large number of majority carriers is

The energy band gap is maximum in

On moving a charge of \(20\) coulomb by \(2\) \(cm,\) \(2\) \(J\) of work is done, then the potential differences between the points is

A charged particle \(q\) is placed at the centre \(O\) of cube of length \(L(ABCDEFGH).\) Another same charge \(q\) is placed at a distance \(L\) from \(O\). Then the electric flux through \(ABCD\) is

If a charge \(q\) is placed at the center of the line joining two equal charges \(Q\) such that the system is in equilibrium then the value of \(q\) is

If two mirrors are kept at \({60^ \circ }\) to each other, then the number of images formed by them is

Which of the following is used in optical fibres?

Wavelength of light used in an optical instrument are \({\lambda _1} = 4000\mathop A\limits^ \circ\) and \({\lambda _2} = 5000\mathop A\limits^ \circ ,\) then ratio of their respective resolving powers (corresponding to $${\lambda _1}...

An astronomical telescope has a large aperture to

If suddenly the gravitational force of attraction between Earth and a satellite revolving around it becomes zero, then the satellite will

Energy required to move a body of mass \(m\) from an orbit of radius \(2R\) to \(3R\) is

The escape velocity of a body depends upon mass as

The kinetic energy needed to project a body of mass \(m\) from the earth surface (radius \(R\)) to infinity is

If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should

Which of the following is more close to a black body?

Which statement is incorrect?

1 mole of a gas with \(\gamma = 7/5\) is mixed with \(1\) mole of a gas with \(\gamma = 5/3,\) then the value of \(\gamma\) for the resulting mixture is

At what temperature is the \(r.m.s\) velocity of a hydrogen molecule equal to that of an oxygen molecule at \({47^ \circ }C?\)

Two spheres of the same material have radii \(1\) \(m\) and \(4\) \(m\) and temperatures \(4000\) \(K\) and \(2000\) \(K\) respectively. The ratio of the energy radiated per second by the first sphere to that by the second is

Even Carnot engine cannot give \(100\%\) efficiency because we cannot

Infrared radiation is detected by

Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will

Heat given to a body which raises its temperature by \({1^ \circ }C\) is

Three identical blocks of masses \(m=2\) \(kg\) are drawn by a force \(F=10.2\) \(N\) with an acceleration of \(0.6\) \(m{s^{ - 2}}\) on a frictionless surface, then what is the tension (in \(N\)) in the string between the blocks \(B\) and ...

A light string passing over a smooth light pulley connects two blocks of masses \({m_1}\) and \({m_2}\) (vertically). If the acceleration of the system is \(g/8\), then the ratio of the masses is

A lift is moving down with acceleration \(a.\) A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

When forces \({F_1},\,\,{F_2},\,\,{F_3}\) are acting on a particle of mass \(m\) such that \({F_2}\) and \({F_3}\) are mutually perpendicular, then the particle remains stationary. If the force \({F_1}\) is now removed then the acceleration...

Two forces are such that the sum of their magnitudes is \(18\) \(N\) and their resultant is \(12\) \(N\) which is perpendicular to the smaller force. Then the magnitudes of the forces are