List of top Physics Questions

An $\alpha$-particle of energy \( E \) is liberated during the decay of a nucleus of mass number 236. The total energy released in this process is 236. The total energy released in this process is
Convex mirror is used as

Two point charges M and N having charges +q and -q respectively are placed at a distance apart. Force acting between them is F. If 30% of charge of N is transferred to M, then the force between the charges becomes:

The electrical energy (in kWh) consumed in operating a bulb of 40 W for 5 hours a day in a month of 30 days is
In hypermetropia defect, the image is formed
An auto driver started an auto rickshaw with the help of pulling a rope. The device used by him to convert mechanical energy into electrical energy is
In old age, the value of least distance of distinct vision shifts to
If △Φ and △t are the change in magnetic flux and time respectively, then the induced EMF is
A particle of mass 4 mg is executing simple harmonic motion along x-axis with an angular frequency of 40 rad/s. If the potential energy of the particle is \( V(x) = a + bx^2 \), where \( V(x) \) is in joule and \( x \) is in meter, then the value of \( b \) is:

In a time ‘’t", the amplitude of vibrations of a damped oscillator becomes half of its initial value, then the mechanical energy of the oscillator decreases by:

Formation of dew and fog is due to the process of
Electric power is the product of current and
The light which has the maximum angle of deviation is
Blue colour of the sky is due to the scattering of light by the atmospheric molecules of
During the process of conversion from liquid to solid, the internal energy of the water
If a particle executing simple harmonic motion with period \( T \) and displacement \( x = A \cos(\omega t) \), then the acceleration and velocity of the particle at the time \( t = \frac{T}{2} \) are respectively:
A cannon fires two similar shells one after the other each with a velocity of 100 m/s at angles 60$^\circ$ and 30$^\circ$ respectively with the horizontal such that they both hit the target at the same time. The time interval between the firing of the two shells is (Acceleration due to gravity = 10 m/s²).
The C.G.S. unit of heat energy is
If the total momentum delivered to a surface by an EM wave is \(3 \times 10^{-4}\) kg m/s, then the total energy transferred to this surface is:
Two currents 3 mA and 5 mA are flowing towards the junction in a circuit and three currents 1 mA, 1.5 mA and x are flowing away. The value of x (in mA) is
The lens which is bounded by one-curved surface is
Masses of three copper wires are in the ratio 1:3:5 and their lengths are in the ratio 5:3:1. Then the ratio of their electric resistances is
40 g of water at 40°C is added to 10 g of water at 80°C. The final temperature of the mixture is 40°C
A path length of 1m in air is equal to a path length of \(x\) m in a medium of refractive index 1.5. Then the value of \(x\) (in meters) is:

An alphabet 'a' made of two similar thin uniform metal plates of each length \( L \) and width \( a \) is placed on a horizontal surface as shown in the figure. If the alphabet is vertically inverted, the shift in the position of its center of mass from the horizontal surface is: