List of top Physics Questions asked in KEAM

An average frictional force of 80N is required to stop an object at a distance of 25m. If the initial speed of the object is 20m/s,the mass of the object is:

A planet has an escape speed of 10km/s,The radius of the planet is 10,000km. The acceleration due to gravity of the planet at its surface is:

A projectile is thrown at a speed V and at an angle with the horizontal. If the speed at its maximum height is \(\frac{V}{3}\),then the value of tan θ is:

Two satellites A and B are moving around the earth in a circular orbit of radius 2R,respectively. If the kinetic energy of the satellite A is two-times the kinetic energy of the satellite B,the ratio of their masses (m_A:m_B) is:

A horizontal force is exerted on a 20 kg box to slide it up on an inclined plane with an angle of 30°. The frictional force retarding the motion is 80 N. If the box moves with a constant speed, then the magnitude of the force is:(Take g=10 ms^-2)

Consider a vector addition \(\vec{P}\)+\(\vec{Q}\)=\(\vec{R}\). If \(\vec{P}\)=|\(\vec{P}\)|\(\hat{i}\),|\(\vec{Q}\)|=10 and\(\vec{R}\)= 3 |\(\vec{P}\)|\(\hat{j}\),then |\(\vec{P}\)| is:

A magnetic field of (10^-4\(\hat{k}\))T exerts a force of (4\(\hat{i}\)-3\(\hat{j}\))x10^-12N on a particle having a charge of 10^-9C. The speed of the particle is:

The angle of minimum deviation for a prism of apex angle 60° and refractive index of \(\sqrt{2}\) is:

An inductor coil with an internal resistance of 50 Ω stores magnetic field energy 180 mJ and dissipates energy as heat at the rate of 200 W when a constant current 9 passed through it. The inductance of the coil will be:

In a Zener regulated power supply circuit as shown in figure below,a Zener diode with V_z=1OV is used for regulation. The load current,Zener current and unregulated input V_in are 5mA,35mA and 20V,respectively. The value of R is:

A car moving with a velocity of 10m/s can be stopped by the application of a constant force F in a distance of 20m. If the velocity of the car is 30m/s. It can be stopped by this force in

A billiard ball of mass ‘M’ moving with velocity ‘v₁’ collides with another ball of the same mass but at rest. If the collision is elastic the angle of divergence after the collision is

A Simple pendulum experiment is performed for the value of 'g',the acceleration due to the earth's gravity. The measured value of length of the pendulum is 25 cm with an accuracy of 1 mm and the measured time for 100 oscillations is found to be 100 sec with an accuracy of 1 sec. The percentage uncertainty in the determination of 'g' is:

N capacitors,each with 1μF capacitance,are connected in parallel to store a charge of 1C. The potential across each capacitor is 100V. If these N capacitors are now connected in series,the equivalent capacitance in the circuit will be:

In an oil drop experiment, 'n' numbers of electrons are stripped from an oil drop to make it positively charged. A vertical electric field of magnitude 4.9x10¹⁴ N/C is applied to balance the force due to gravity on the oil drop. If the mass of oil drop is 80 μg,the value of 'n' will be:(Take g =9.8 m/s² and charge of an electron = 1.6 x 10^-19 C)

Car P is heading east with a speed V and car Q is heading north with a speed \(\sqrt{3}\). What is the velocity of car Q with respect to car P?

Two identical solid spheres,each of radius 10cm,are kept in contact. If the mass of inertia of this system about the tangent passing through the point of contact is 0. Then mass of each sphere is:

Two thin convex lenses L₁ and L₂,have focal lengths 4 cm and 10 cm, respectively. They are separated by a distance of x cm as shown in the figure. A point source S is placed on the principal axis at a distance 12 cm to the left of L₁. If the image of S is formed at infinity, the value of x is:

A wheel is rolling on a plane surface. A point on the rim of the wheel at the same level as the Centre has a speed of 4m/s. The speed of the Centre of the wheel is:

An ideal diatomic gas is made up of molecules that do not vibrate. Its volume compressed by a factor of 32,without any exchange of heat. If the initial and final pressures are P₁ and P₂,respectively,the ratio P₁:P₂,is:

A body undergoing a straight line motion is under the influence of source of constant power. How does its displacement very with time?

A laser source emits light of wavelength 300nm and has a power of 3.3mW. The average number of photons emitted per second is:(Speed of light-3x10⁸m/s,Plank's constant 6.6 x 10^-34J/s)

A glass capillary of radius 0.15 mm is dipped into a liquid of density and surface tension 1600 kg/m³ and 0.12 Nm^-1,respectively. The liquid in the capillary rises by a height of 5.0 cm. The contact angle between liquid and glass will be:(Take g=10 ms^-2)

For the hydrogen spectrum,the wavelength in Balmer series is given by \(\frac{1}{λ}\)=R(\(\frac{1}{n_{1}^{2}}\)-\(\frac{1}{n_{2}^{2}}\)) where λ= wavelength and R is Rydberg constant. What are the values of n₁ and n₂,for the longest wavelength in the Balmer series?

A hollow sphere of radius 'r' encloses an electric dipole composed of two charges +q and -q. The net flux of electric field through the surface of the sphere due to the enclosed dipole is:

List of top Physics Questions asked in KEAM

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