List of top Physics Questions asked in KCET

The image formed by an objective lens of a compound microscope is

A ray of light passes from vacuum into a medium of refractive index \( n \). If the angle of incidence is twice the angle of refraction, then the angle of incidence in terms of refractive index \( n \) is

In domestic electric mains supply, the voltage and the current are

Match the following types of waves with their wavelength ranges

A sinusoidal voltage produced by an AC generator at any instant \( t \) is given by an equation \( V = 311 \sin (314t) \). The rms value of voltage and frequency are respectively

Two similar galvanometers are converted into an ammeter and a millammeter. The shunt resistance of ammeter as compared to the shunt resistance of millammeter will be

Identify the correct statement:

If we consider an electron and a photon with the same de-Broglie wavelength, then they will have the same

Given, a current carrying wire of non-uniform cross-section, which of the following is constant throughout the length of the wire?

Two thin long parallel wires separated by a distance \( r \) from each other in vacuum carry a current of 1 ampere in opposite directions. Then, they will

The electric current flowing through a given conductor varies with time as shown in the graph below. The number of free electrons which flow through a given cross-section of the conductor in the time interval \( 0 \leq t \leq 20 \, \text{s} \) is

A block of certain mass is placed on a rough inclined plane. The angle between the plane and the horizontal is \( 30^\circ \). The coefficients of static and kinetic frictions between the block and the inclined plane are 0.6 and 0.5 respectively. Then the magnitude of the acceleration of the block is

An electric bulb of 60 W, 120 V is to be connected to a 220 V source. What resistance should be connected in series with the bulb, so that the bulb glows properly?

The ratio of molar specific heats of oxygen is

The upper level of valence band and lower level of conduction band overlap in the case of

In an experiment to determine the temperature coefficient of resistance of a conductor, a coil of wire X is immersed in a liquid. It is heated by an external agent. A meter bridge set up is used to determine resistance of the coil X at different temperatures. The balancing points measured at temperatures \( t_1 = 0^\circ \text{C} \) and \( t_2 = 100^\circ \text{C} \) are 50 cm and 60 cm respectively. If the standard resistance taken out is \( S = 4 \, \Omega \) in both trials, the temperature coefficient of the coil is

Three polaroid sheets are co-axially placed as indicated in the diagram. Pass axes of the polaroids 2 and 3 make 30° and 90° with pass axes of polaroid sheet 1. If \( I_1 \) is the intensity of the incident unpolarised light entering sheet 1, the intensity of the emergent light through sheet 3 is

In an LCR series circuit, the value of only capacitance \( C \) is varied. The resulting variation of resonance frequency \( f_0 \) as a function of \( C \) can be represented as

The natural logarithm of the activity \( R \) of a radioactive sample varies with time \( t \) as shown. At \( t = 0 \), there are \( N_0 \) undecayed nuclei. Then \( N_0 \) is equal to \([\text{Take} \ e^{7.5}] \)

In the diagram shown, the Zener diode has a reverse breakdown voltage \( V_z \). The current through the load resistance \( R_L \) is \( I_L \). The current through the Zener diode is

One mole of an ideal monatomic gas is taken round the cyclic process \( MNOM \). The work done by the gas is

The value of acceleration due to gravity at a height equal to half the radius of the Earth, from its surface

A thick metal wire of density \( \rho \) and length \( L \) is hung from a rigid support. The increase in length of the wire due to its own weight

Water flows through a horizontal pipe of varying cross-section at a rate of 0.314 m³/s. The velocity of water at a point where the radius of the pipe is 10 cm is

A body of mass 1 kg is suspended by a weightless string which passes over a frictionless pulley of mass 2 kg as shown in the figure. The mass is released from a height of 1.6m from the ground. With what velocity does it strike the ground?