List of top Physics Questions asked in Guru Gobind Singh Indraprastha University Common Entrance Test

If the escape speed of a projectile on Earth's surface is \( 11.2 \, \text{km/s} \) and a body is projected out with thrice this speed, then determine the speed of the body far away from the Earth.
Electrons are accelerated through a potential difference \( V_e \), and protons are accelerated through a potential difference of 4 V. The de-Broglie wavelengths are \( \lambda_e \) and \( \lambda_p \) for electrons and protons, respectively. The ratio of \( \frac{\lambda_e}{\lambda_p} \) is given by (given \( m_e \) is mass of electrons and \( m_p \) is mass of protons):
Given I. Plane mirrors II. Concave mirrors III. Convex mirrors Given the preceding choices, virtual images can be formed by:
In hydrogen atom spectrum, frequency of \( 2.7 \times 10^{15} \, \text{Hz} \) of EM wave is emitted when transmission takes place from 2 to 1, the frequency emitted will be
If electrical force between two charges is 200 N and we increase 10% charge on one of the charges and decrease 10% charge on the other, then electrical force between them for the same distance becomes
The length of a magnet is large compared to its width and breadth. The time period of its oscillation in vibration magnetometer is 2 s. The magnet is cut along its length into three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be:
An object stands 4 cm in front of a converging lens. If the lens has a focal distance of 1 cm, where is the image formed?
The image seen in a flat bathroom mirror is a
A block of mass m slides down with uniform speed on an inclined plane having inclination \( \theta \). If the coefficient of friction between the inclined plane and the block is \( \mu \), then the contact force between them is:
A U-shaped wire is dipped in a soap solution and removed. The thin soap film formed between the wire and light slider supports a weight of \( 1.5 \times 10^{-2} \, \text{N} \). The length of the slider is 30 cm. What is the surface tension of the film?
If \( N_0 \) be the number of nuclei present at time \( t = 0 \), then the number of undecayed nuclei, \( N \), present after \( n \) mean life is
A body of density \( D \), and mass \( M \) is moving downward in glycerine of density \( D_z \). What is the viscous force acting on it?
A solid cylinder of mass 20 kg rotates about its axis with angular speed 100 rad/s. The radius of the cylinder is 0.25 m. What is the kinetic energy associated with the rotation of the cylinder? What is the magnitude of angular momentum of the cylinder about its axis?
A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with speed 40 rev/min in a horizontal plane. What is the tension in the string and what is the maximum speed with which the stone can be whirled around, if the string can withstand a maximum tension of 200 N?
Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of 72 km/h in the same direction, with A ahead of speed B. The driver of B decides to overtake A and accelerates by 1 m/s². If after 50s, the guard of B just brushes past the driver of A, what was the original distance between them?
A liquid is poured into a vessel at rest with the hole in a wall closed by a valve. It is filled to height \( H \). The distance of the hole from the top surface is \( h \). What is the horizontal acceleration required to move the vessel so that the liquid does not come out when the valve is opened (given \( l = \) length of the base)?
A beam of light (\( \lambda = 600 \, \text{nm} \)) from a distant source, falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is:

A glass prism ABC (refractive index 1.5), immersed in water (refractive index \( \frac{4}{3} \)). A ray of light is incident normally on face AB. If it is totally reflected at face AC, then

An ideal gas is taken through a cyclic thermodynamical process through four steps. The amounts of heat involved in these steps are \( Q_1 = 5960 \, \text{J} \), \( Q_2 = -5585 \, \text{J} \), \( Q_3 = -2980 \, \text{J} \) and \( Q_4 = 3645 \, \text{J} \), respectively. The value of \( W_4 \) is:
A rocket is fired from the Earth towards the Sun. At what distance from the Earth's centre, the gravitational force on the rocket is zero? Mass of the Sun = \( 2 \times 10^{30} \, \text{kg} \) and mass of the Earth = \( 6 \times 10^{24} \, \text{kg} \).

Ball A moving at 12 m/s collides elastically with ball B, initially at rest as shown. If both balls have the same mass, then what is the final velocity of ball A?

If 10% of a radioactive substance decays in every 5 years, then the percentage of the substance that will have decayed in 20 years, will be:
A and B are at an angle of 60° with each other. Their resultant makes an angle of 45° with a. If \( b = 2 \) units, then \( a \) is:
Which of the following factors by itself will increase the frequency at which an observer hears a sound emanating from a source?
A stretched string of length 1 m fixed at both ends, when vibrated in one loop has a frequency of 200 Hz. It is now plucked at a point situated at 25 cm from one end. The stretched string would vibrate with a frequency of: