KCET 2017

The output of a step down transformers is measured to be 48 V when connected to a 12 W bulb. The value of peak current is

A coil of inductive reactance $1 / \sqrt{3} \Omega$ and resistance $1 \Omega$ is connected to a $200 \mathrm{~V}, 50 \mathrm{~Hz}$ AC supply. The time lag between maximum voltage and current is

In the A.C. circuit shown, keeping ' $K$ ' pressed, if an iron rod inserted into the coil, the bulb in the circuit,

The scientist who is credited with the discovery of 'nucleus' in an atom is

The mass defect of ${ }_2^4 \mathrm{He}$ is 0.03 u . The binding energy per nucleon of helium (in MeV) is

The energy (in eV ) required to excite an electron from $n=2$ to $n=4$ state in hydrogen atom is

In a nuclear reactor, the function of the moderator is to decreases

The particle emitted in the decay of ${ }_{92}^{238} \mathrm{U}$ to ${ }_{92}^{234} \mathrm{U}$

The minimum value of effective capacitance that can be obtained by combining 3 capacitors of capacitances $1 \mathrm{pF}, 2 \mathrm{pF}$ and 4 pF

A system of two capacitors of capacitance $2 \mu \mathrm{~F}$ and $4 \mu \mathrm{~F}$ is connected in series across a potential difference of 6 V . The electric charge and energy stored in a system are

Two balls are thrown simultaneously in air. The acceleration of the centre of mass of the two balls when in air

The angle between velocity and acceleration of a particle describing uniform circular motion is

A basic communication system consists of
(i) Transmitter
(ii) Information sources
(iii) User of information
(iv) Channel
(v) Receiver

A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are ......................and............................respectively.

A cylindrical conductor of diameter 0.1 mm carries a current of 90 mA . The current density ( in $\mathrm{Am}^{-2}$ ) is ( $\pi \approx 3$ )

In meter bridge experiment, with a standard resistance in the right gap and a resistance coil dipped in water (in a beaker) in the left gap, the balancing length obtained is ' $l$ '. If the temperature of water is increased, the new balanci...

The power dissipated in $3 \Omega$ resistance in the following circuit is

\(\text { The value of } I \text { in the figure shown below is }\)

Of the following graphs, the one that correctly represents the $I-V$ characteristics of a 'Ohmic device' is

A galvanometer of resistance $50 \Omega$ is connected to a battery of $3 \cdot \mathrm{~V}$ along with a${ }^{\text { }}$ resistance of $2950 \Omega$ in series shows full-scale deflection of 30 divisions. The additional series resistance re...

A particle is dropped from a height $H$. The de-Broglie wavelength of the particle depends on height as

From the following graph of photo current against collector plate potential, for two different intensities of light $I_1$ and $I_2$, one can conclude

'Young's modulus' is defined as the ratio of

A jet plane of wing span 20 m is travelling towards west at a speed of $400 \mathrm{~ms}^{-1}$. If the earth's total magnetic field is $4 \times 10^{-4} \mathrm{~T}$ and the dip angle is $30^{\circ}$, at that place, then the voltage differe...

The working of magnetic braking of trains is based on

A bar magnet is allowed to fall vertically through a copper coil placed in a horizontal plane. The magnet falls with a net acceleration, is

If $\mathbf{E}$ and $\mathbf{B}$ represent electric and magnetic field vectors of an electromagentic wave, the direction of propagation of the wave is along

Two point charges $A=+3 \mathrm{nC}$ and $B=+1 \mathrm{nC}$ are placed 5 cm apart in air. The work done to move charge $B$ towards $A$ by 1 cm is

Two spheres of electric charges +2 nC and -8 nC are placed at a distance $d$ apart. If they are allowed to touch each other, what is the new distance between them to get a repulsive force of same magnitude as before?

$4 \times 10^{10}$ electrons are removed from a neutral metal sphere of diameter 20 cm placed in air. The magnitude of the electric field (in $\mathrm{NC}^{-1}$ ) at a distance of 20 cm from its centre is

Three point charges of $+2 q,+2 q$ and $-4 q$ are placed at the corners $A, B$ and $C$ of an equilateral triangle $A B C$ of side $x$. The magnitude of the electric dipole moment of this system is

'Hydraulic lift' works on the basis of

The value of acceleration due to gravity at a depth of 1600 km is equal to

The mean energy of a molecule of an ideal gas is

The S.I. unit of specific heat capacity is

For which combination of working temperatures, the efficiency of Carnot's engine is the least?

A body of the mass 50 kg is suspended using a spring balance inside a lift at rest. If the lift starts falling freely, the reading of the spring balance is

The susceptibility of a ferromagnetic substance is

Which of the following properties is 'False' for a bar magnet?

A car moving with a velocity of $20 \mathrm{~ms}^{-1}$ stopped at a distance of 40 m . If the same car is travelling at double the velocity, the distance travelled by it for same retardation is

The magnetic field at the centre of a current carrying loop of radius 0.1 m is $5 \sqrt{5}$ times that at a point along its axis. The distance of this point from the centre of the loop is

A proton, a deuteron and an $\alpha$-particle are projected perpendicular to the direction of a uniform magnetic field with same kinetic energy. The ratio of the radii of the circular paths described by them is

A magnetic dipole of magnetic moment $6 \times 10^{-2}$ A-m ${ }^2$ and moment of inertia $12 \times 10^{-6} \mathrm{~kg}-\mathrm{m}^2$ performs oscillations in a magnetic field of $2 \times 10^{-2} \mathrm{~T}$. The time taken by the dipol...

A straight wire of length 50 cm carrying a current of 2.5 A is suspended in mid-air by a uniform magnetic field of 0.5 T (as shown in figure). The mass of the wire is ( $g=10 \mathrm{~ms}^{-2}$ )

A linear object of height 10 cm is kept in front of a concave mirror of radius of curvature 15 cm , at a distance of 10 cm . The image formed is

According to cartesian sign convention, in ray optics

The energy gap in case of which of the following is less than 3 eV ?

In the three parts of a transistor, 'Emitter' is of

Which of the following semi-conducting device is used as voltage regulator?

In the figure shown, if the diode forward voltage drop is 0.2 V , the voltage difference between $A$ and $B$ is