KCET 2017

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

Which of the following logic gate is universal gate

Two simple pendulums $A$ and $B$ are made to oscillate simultaneously and it is found that $A$ completes 10 oscillations in 20 sec and $B$ completes 8 oscillations in 10 sec . The ratio of the length of $A$ and $B$ is

A substance of mass 49.53 g occupies $1.5 \mathrm{~cm}^3$ of volume. The density of the substance (in $\mathrm{g} \mathrm{cm}^{-3}$ ) with correct number of significant figures is

If $\mathbf{A}=2 \hat{\mathbf{i}}+3 \hat{\mathbf{j}}+8 \hat{\mathbf{k}}$ is perpendicular to $\mathbf{B}=4 \hat{\mathbf{j}}-4 \hat{\mathbf{i}}+\alpha \hat{\mathbf{k}}$, then the value of $\alpha$ is

In a system of two crossed polarisers, it is found that the intensity of light from the second polariser is half from that of first polariser. The angle between their pass axes is

During scattering of light, the amount of scattering in inversely proportional to................ of wavelength of light.

In Young's double-slit experiment, if yellow light is replaced by blue light, the interference fringes becomes

According to Huygens' principle, during refraction of light from air to a denser medium

The waves set up in a closed pipe are

A motor pump lifts 6 tonnes of water from a well of depth 25 m to the first floor of height 35 m from the ground floor in 20 minutes. The power of the pump (in kW ) is $\left[g=10 \mathrm{~ms}^{-2}\right.$ ]