List of top Questions asked in KCET- 2026

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

The angular momentum of a moving body remains constant, if

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

An n-type and p-type semiconductor can be obtained by respectively doping pure silicon with

The activation energy for the reaction X \(\rightarrow\) Y is 150 kJ mol\(^{-1}\). The change in enthalpy for the above reaction is -135 kJ mol\(^{-1}\). Then the activation energy for Y \(\rightarrow\) X is _________.

Which one of the following graph is not applicable for a 1st order reaction (R \(\rightarrow\) P)?

For a reaction having three steps, the overall rate constant is \( K = \frac{k_1 k_2}{k_3} \). The values E\(_{a1}\), E\(_{a2}\) and E\(_{a3}\) (activation energies stepwise) are 40, 50 and 60 kJ mol\(^{-1}\) respectively. Then the overall E\(a\) (activation energy) of the reaction is ______

For a 1st order change R \(\rightarrow\) P, the concentration of Reactant R changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of R is 0.01 M is________.

Given below are the half-cell reactions:
$Mn^{2+} + 2e^- \rightarrow Mn$ (E$^\circ$ = -1.18 V)
$Mn^{3+} + e^- \rightarrow Mn^{2+}$ (E$^\circ$ = +1.51 V)
The E$^\circ_{cell}$ for $3Mn^{2+} \rightarrow Mn + 2Mn^{3+}$ will be \textunderscore\textunderscore\textunderscore\textunderscore

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

Match the physical quantities given in List-I with dimensions expressed in terms of mass (M), length (L), time (T) and electric current (A) given in List-II.

Codes:

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

A mass of 1 kg is executing SHM. Its displacement is given by \( x = 6.0 \cos(100t + \pi/4) \) cm. What is the maximum kinetic energy?

A source of frequency \( \nu \) gives 6 beats/second when sounded with a source of frequency 200 Hz. The second Harmonic of frequency \( 2\nu \) of the source gives 8 beats/second when sounded with a source of frequency 420 Hz. The value of \( \nu \) is

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

Following are statements of a few processes taking place in nature.
I. Free expansion of a gas
II. The combustion of a mixture of petrol and air ignited by a spark
III. The leaking of gas from the kitchen cylinder
IV. The transfer of heat from one heated part of a liquid to the other colder part
Which amongst these processes are irreversible in nature?

In a capillary tube experiment, a vertical 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 elevator, then the length of the water column becomes

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 new planet is g' and that on the surface of the earth is g, then

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

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

A horizontal force of 5 N is applied on a stationary body of mass 5 kg, which is initially at rest on a frictionless table. The change in kinetic energy of the body in 10 s is

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

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

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