List of top Physics Questions asked in KCET

Three polaroid sheets $P_1, P_2$ and $P_3$ are kept parallel to each other such that the angle between pass axes of $P_1$ and $P_2$ is $45^\circ$ and that between $P_2$ and $P_3$ is $45^\circ$. If unpolarised beam of light of intensity $128 Wm^{-2}$ is incident on $P_1$. What is the intensity of light coming out of $P_3$?

A radio-active elements has half-life of $15$ years. What is the fraction that will decay in $30$ years?

Due to Doppler?? effect the shift in wavelength observed is 0.1 ? for a star producing wavelength 6000 ?. Velocity of recession of the star will be

A girl of height $150 \,cm$ with her eye level at $140 \,cm$ stands in front of plane mirror of height $75 \,cm$ fixed to a wall. The lower edge of the mirror is at a height of $85 \,cm$ above her feet level. The height of her image the girl can see in the mirror is

An object with mass 5 kg is acted upon by a force, $\vec{F}=\left(-3\widehat{i}+4\widehat{j}\right)N$. If its initial velocity at t = 0 is $\vec{v}=\left(3\widehat{i}+12\widehat{j}\right)m/s$ , the time at which it will just have a velocity along y-axis is

The conductivity of semiconductor increases with increase in temperature because

In a potentiometer experiment, the balancing point with a cell is at a length 240 cm. On shunting the cell with a resistance of 2 $\Omega$, the balancing length becomes 120 cm. The internal resistance of the cell is

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because

In a cyclotron, a charged particle :

In a cyclotron, a charged particle

The given graph shows the variation of velocity (v) with position (x) for a particle moving along a straight line. Which of the following graph shows the variation of acceleration (a) with position (x)?

The trajectory of a projectile projected from origin is given by the equation y = x - $\frac{2x^2}{5}$ . The initial velocity of the projectile is

A circular current loop of magnetic moment M is in an arbitrary orientation in an external uniform magnetic field $\overrightarrow{B}$ . The work done to rotate the loop by 30? about an axis perpendicular to its plane is

An aluminium sphere is dipped into water. Which of the following is true?

An antenna uses electromagnetic waves of frequency 5 MHz. For proper working, the size of the antenna should be

A capacitor of capacitance C charged by an amount Q is connected in parallel with an uncharged capacitor of capacitance 2C. The final charges on the capacitors are

Frequency of revolution of an electron revolving in nth orbit of H-atom is proportional to

The readings of ammeter and voltmeter in the following circuit are respectively

Kichhoff?s junction rule is a reflection of

A piston is performing S.H.M. in the vertical direction with a frequency of 0.5 Hz. A block of 10 kg is placed on the piston. The maximum amplitude of the system such that the block remains in contact with the piston is

Coersivity of a magnet where the ferromagnet gets completely demagnetized is $3 \times 10^3 Am^{?

Which one of the following nuclei has shorter mean life?

In a permanent magnet at room temperature

The frequency of an alternating current is 50 Hz. What is the minimum time taken by current to reach its peak value from rms value?

The equivalent capacitance between A and B is,