List of top Physics Questions asked in KCET

A small town with a demand of 900 kW of electric power at 220 V is situated 20 km away from an electric power generating station. The two-wires line has resistance per unit length of \( 5 \times 10^{-4} \ \Omega \text{m}^{-1} \). The town gets power from the line through 45000 V to 220 V stepdown transformer at a substation in the town. The line power loss in the form of heat is
An electron falls through a distance 1.5 cm in a uniform electric field of magnitude 2.0 \(\times\) 10\(^4\) N/C from rest. The time taken to cover this distance in second is \textunderscore\textunderscore\textunderscore\textunderscore\textunderscore.
(e = 1.6 \(\times\) 10\(^{-19}\) C, m\(_e\) = 9.11 \(\times\) 10\(^{-31}\) kg)
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?
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
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?
The graph of pressure P and volume V of 1 mole of an ideal gas at constant temperature is
In thermodynamic processes, which of the following statements is not true?
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
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
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 m/s\(^2\) and at the surface of moon it is g' m/s\(^2\). An M kg passenger goes from the earth to the moon in a spaceship moving with a constant velocity (Neglect all other objects in the sky). Which curve best represents the weight (net gravitational force) as a function of time?
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
If the earth were to suddenly contract to half of its present radius, what would be the duration of the day?
The angular momentum of a moving body remains constant, if
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
Two bodies with kinetic energies in the ratio of 3:1 are moving with equal linear momentum. The ratio of their masses 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 m/s\(^2\). What would be his weight in kg? (g = 10 m/s\(^2\))
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 zero 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
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
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:
Which of the following circuits is correct for verification of Ohm's law?
From the graph of angle of deviation versus angle of incidence for an equilateral prism, the refractive index of material of prism is
A wafer of pure germanium crystal has two parts X and Y. The end X is obtained by doping with arsenic and Y with indium. It is connected to a battery as shown in the figure. Which of the following statements is correct?