List of top Physics Questions asked in KEAM

A metallic bar of coefficient of linear expansion $10^{-5} K^{-1}$ is heated from $0^{\circ}C$ to $100^{\circ}C$. The percentage increase in its length is
If $m$ represents the mass of each molecule of a gas and $T$, its absolute temperature, then the root mean square velocity of the gaseous molecule is proportional to
A ground receiver receives a signal at $5\, MHz$, transmitted by a ground transmitter at a height of $320\, m$, which is $110\, km$ away from it. Then it can communicate through (radius of earth $R \,= \,6400 \,km$)
The current $ I $ through $ 10\,\Omega $ resistor in the circuit given below is
The polarity of induced emf is given by
A linear harmonic oscillator with force constant 3.210N m and amplitude 0.01 m has a
The Carnot cycle of a reversible heat engine consists of
The power factor of $LCR$ circuit at resonance is
The amount of charge flowing per second per unit area normal to the flow is called
A paramagnetic substance of susceptibility $ 3\times {{10}^{-4}} $ is placed in a magnetic field of $ 4\times {{10}^{-4}}A{{m}^{-1}} $ . Then the intensity of .magnetization in the units of $ A{{m}^{-1}} $ is
The ratio of the respective de Broglie wavelengths associated with electrons accelerated from rest with the voltages 100 V, 200 V and 300 V is
A bullet fired into a fixed wooden block loses half of its velocity after penetrating $40\,cm$. It comes to rest after penetrating a further distance of
The number of photons emitted per second by a $60\, W$ source of monochromatic light of wavelength $663\, nm$ is $ (h=6.63\times {{10}^{-34}}Js) $
The magnification of an image by a convex lens is positive only when the object is placed
The propulsion of a rocket is based on the principle of conservation of
A narrow slit of width $2 \,mm$ is illuminated by monochromatic light of wavelength $500\, nm$. The distance between the first minima on either side on a screen at a distance of $1 \,m$ is
A radioactive sample at any instant has its disintegration rate $5000$ disintegrations per minute. After $5\, min$, the rate becomes $1250$ disintegration per minute. Then, its decay constant (per minute) is
A cyclist bends while taking turn in order to
A ball is dropped from a height $h$. If the coefficient of restitution is $e$ then to what height will it rise after jumping twice from the ground
Identify the wrong statement
A rubber cord of density $d,$ Young?s modulus $Y$ and length $L$ is suspended vertically. If the cord extends by a length $0.5\, L$ under its own weight, then $L$ is
A small spherical ball falling through a viscous medium of negligible density has terminal velocity $v$. Another ball of the same mass but of radius twice that of the earlier falling through the same viscous medium will have terminal velocity
The depth $d$ at which the value of acceleration due to gravity becomes $\frac {1} { n}$ time the value at the surface is (R be the radius of the earth)
A Carnot engine operating between temperatures $T_1$ and $T_2$ has efficiency $0.2$. When $T_2$ is reduced by $50\, K$, its efficiency increases to $0.4$. Then $T_1$ and $T_2$ are respectively
An electron, placed in an electric field, experiences a force F of $1\, N.$ What are the magnitude and direction of the electric field E at the point where the electron is located $(e = 1.6 \times 10^{-19} C)$ ?