KCET 2026

A small town with a demand of $900\text{ kW}$ of electric power at $220\text{ V}$ is situated $20\text{ km}$ away from an electric power generating station. Each wire of the two-wire transmission line has a resistance per unit length of $5 ...

A light bulb rated $100$ W is connected to an AC source of $220$ V, $50$ Hz. The rms current through the bulb is

In a circuit containing a pure resistor connected to an AC source,

An electron transition takes place from excited state to ground state in hydrogen atom, then

Bohr's second postulate implies quantisation of

The radius of first orbit in hydrogen atom is $5.3 \times 10^{-11}$ m. The kinetic energy $E_K$, potential energy $E_P$ and total energy $E_T$ of electron in first orbit are

In the circuit shown in the figure, the potential difference across the $4 \mu\text{F}$ capacitor is

A parallel plate capacitor has a uniform electric field '$E$' in the space between the plates. If the distance between the plates is '$d$' and area of each plate is '$A$', the energy stored in the capacitor is

In the figure, the values of currents $I_1, I_2$ and $I_3$ respectively are

Which of the following circuits is correct for verification of Ohm's law?

In a conducting region, $10^{19}$ electrons and $10^{19}$ protons move to the left, while $10^{19}$ $\alpha$-particles move to the right per second. The resulting electric current is $(e = 1.6 \times 10^{-19}\text{ C})$ _________

Current flowing through a wire decreases linearly from $10$ A to zero in $4$ s as shown in the graph. Find the total charge flowing through the wire in the given time interval.

Given below are two statements:Statement-I: The resistivity of a conductor is independent of its temperature.Statement-II: The resistivity of a semiconductor decreases with increase in temperature.Select the correct option.

The number of electrons moving per second through the filament of a lamp of $60$ W operating at $120$ V is nearly $(e = 1.6 \times 10^{-19}\text{ C})$ _____________.

Variation of photoelectric current with anode potential is shown below. Choose the correct option ($V_0$ = stopping potential)

Work function of the metal is

There are two wires of same material and same length while the diameter of second wire is two times the diameter of the first wire. Then the ratio of extensions produced in the wires by applying same load will be

In the figure shown, the conductor PQ of length $l$ is moved from $x = 0$ to $x = b$ and then up to $x = 2b$ with a constant velocity $\vec{v}$. A uniform magnetic field $\vec{B}$ is perpendicular to the plane of the paper and extends from ...

In Faraday-Henry's experiment, a coil is connected to a galvanometer. For the deflection of pointer in the galvanometer, which of the following statement/s is/are WRONG?The pointer in the galvanometer deflects -(a) When the bar magnet is mo...

What range of electromagnetic spectrum is considered as light?

Match the following Maxwell's equations:(The symbols used here have their usual meanings)List-IList-II(a)Gauss' law for electrostatics(i)$\oint \vec{E} \cdot d\vec{A} = \dfrac{Q}{\varepsilon_0}$(b)Gauss' law for magnetism(ii)$\oint \vec{B} ...

A $200$ J of work is done in moving a charge $5$ C from a point A where the potential is $-20$ V to another point B where potential is V volt. The value of V at B is

An electric dipole of dipole moment $\vec{P}$ is placed in the uniform electric field $\vec{E}$. Then which of the following statements are correct?Statement-I: The torque on the dipole is $\vec{P} \times \vec{E}$Statement-II: The potential...

Consider three point charges $-2Q, Q$ and $-Q$ and three surfaces $S_1, S_2$ and $S_3$ as shown in the figure. Match the entries of List-I with that of List-II.List-IList-II(a) Net flux through $S_1$(i) $\dfrac{-2Q}{\varepsilon_0}$(b) Net f...

What will be the total electric flux through the faces of the cube as given in the figure with side of length '$a$' if a charge Q is placed at B midpoint of an edge of the cube (see figure)?

An electron falls through a distance $1.5$ cm in $2.0 \times 10^4$ N/C from rest. The time taken to cover this distance in second is ____$(e = 1.6 \times 10^{-19}\text{ C}, m_e = 9.11 \times 10^{-31}\text{ kg})$

A 30 cm long capillary tube is dipped in water, water rises upto a height of $10$ cm due to capillarity. If this experiment is conducted in a freely falling water in an elevator, then the length of the water column becomes

Instrument fitted in the carburetor of the automobile to provide the correct mixture of air and fuel necessary for combustion works on

Suppose the acceleration due to gravity at the earth's surface is $g \text{ m/s}^2$ and at the surface of moon it is $g' \text{ m/s}^2$. An M kg passenger goes from the earth to the moon in a spaceship moving with a constant velocity (Negle...

Imagine a new planet having the same density as that of the earth, but it is two times bigger than the earth in size. If the acceleration due to gravity on the surface of the earth is $g$ and that on the surface of the new planet is $g'$, t...

Following are statements of a few processes taking place in nature.I. Free expansion of a gasII. The combustion of a mixture of petrol and air ignited by a sparkIII. The leaking of gas from the kitchen cylinder.IV. The transfer of heat from...

In thermodynamic processes, which of the following statements is not true?

The graph of pressure P and volume V of $1$ mole of an ideal gas at constant temperature is

A mass M is hung with a light inextensible string as shown in figure. Find the tension of the horizontal string.

A man weighs $80$ kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $6 \text{ m/s}^2$. What would be his weight in kg? ($g = 10 \text{ m/s}^2$)

Pick out the WRONG statements about magnetic substances.($\chi$ = magnetic susceptibility)($\mu_r$ = relative permeability).I. Substances with $-1 \leq \chi < 0$ are diamagnetic.II. Substances with $\chi \gg 1$ are paramagnetic.III. Substan...

If a paramagnetic bar is brought near a bar magnet, then it is

Two bodies are projected with the same velocity. If one is projected at an angle of $30^\circ$ and the other at $45^\circ$ to the horizontal, then the ratio of maximum heights attained is

The velocity of a particle moving along $x$-axis is given as $V = x^2 - 5x + 4$ (in m/s) where $x$ denotes the $x$-coordinate of the particle in metres. The magnitude of the acceleration of the particle when the velocity of the particle zer...

A car covers the first half of the distance between two places at $40$ km/h and another half at $50$ km/h. The average speed of the car is

A point charge is placed in a moving train. A passenger A sitting in the train and person B on the ground observe the fields due to this charge. Then

Two identical circular current loops carrying equal currents are placed with their axes inclined at $45^\circ$ to each other as shown in the figure. The resultant magnetic field at P is

Biot-Savart law indicates that an electron moving with a velocity $\vec{V}$ produces a magnetic field $\vec{B}$ around it such that

A proton, an electron and an $\alpha$-particle enter at right angles to a uniform magnetic field with the same velocity. If $R_p, R_e$ and $R_\alpha$ are the radii of circular paths of these particles, then

From the graph of angle of deviation versus angle of incidence for an equilateral prism, the refractive index of material of prism is

The critical angle for a monochromatic light going from medium A to medium B is $\theta$. If the speed of light in medium A is $V$, then the speed of light in medium B is

The incorrect statement about refractive index for a pair of media is

The direction of a ray of light incident on a concave mirror is shown by PQ, while direction in which the ray would travel after reflection is shown by four rays marked as A, B, C and D as shown in the figure. Which of the four rays correct...

With reference to the figure shown below, match the following:List-IList-II(a)Angle of reflection(i)$60^\circ$(b)Value of $\alpha$(ii)$120^\circ$(c)Angle of deviation(iii)$30^\circ$

If the earth were to suddenly contract to half of its present radius, what would be the duration of the day?