List of top Physics Questions

Six equal resistances are connected between points P, Q and R as shown in the figure. The net resistance will be maximum between:
circuit
A series AC circuit has a resistance 8Ω and a reactance of 6Ω . The impedance of the circuit is:
A galvanometer having a resistance of $ 8 \, \Omega $ is shunted by a wire of resistance $ 2 \, \Omega $. If the total current is 1 A, the part of it passing through the shunt will be
Two cells with the same emf $ E $ and different internal resistances $ r_1 $ and $ r_2 $ are connected in series to an external resistance $ R $. If the potential difference across the first cell is zero then the value of $ R $ is
The effect of an increase in temperature on the number of electrons in the conduction band (\( n_e \)) and the resistance of a semiconductor will be as follows:
The resistance of a wire is \( 5 \Omega \). What will be its new resistance in ohms if stretched to 5 times its original length?
A bullet of mass 20 g moving with $500 \text{ ms}^{-1}$ is pierd 1 cm into a wooden block, then the retarding for experiend by the bullet is
The energy consumed by a 1000 W electric bulb when it is used for 1 hour is
When a spring of force constant \(200~\text{Nm}^{-1}\) is compressed by a force of \(10~\text{N}\), then the compression in the spring is
A toy car of mass 100 g is moving with velocity of $(\hat{i}+2\hat{j}-3\hat{k})$ m/s, then the kinetic energy of the car is
A block of mass 5 kg moving on a rough surface with a velocity of 4 ms\(^{-1}\) is stopped by the friction in 2 seconds. Then the coefficient of friction between the contact surfaces is:
The speed of a body of mass 10 kg changes from 20 ms$^{-1}$ to 30 ms$^{-1}$. The increase in the kinetic energy of the body is
Frenkel and Schottky defects are:
The ratio of average electric energy density and total average energy density of an electromagnetic wave is:
If work done on a body is positive, then what will be the sign of kinetic energy?

If \( V_1 \) is the velocity of a body projected from point A and \( V_2 \) is the velocity of a body projected from point B, which is vertically below the highest point C, and if both the bodies collide, then: 
 

For the circuit shown in the figure, the current through the inductor is \( 0.9A \) while the current through the condenser is \( 0.4A \). Then: 
 

The P-V diagram of a diatomic ideal gas system undergoing a cyclic process is shown in the figure. The work done during the adiabatic process \( CD \) is (Use \( \gamma = 1.4 \)): 
 

A and B are two metals with threshold frequencies \( 1.8 \times 10^{14} \) Hz and \( 2.2 \times 10^{14} \) Hz. Two identical photons of energy \( 0.825 \) eV each are incident on them. Then photoelectrons are emitted in (Take \( h = 6.6 \times 10^{-34} \) Js):
With neat labelled circuit diagram, describe an experiment to study the characteristics of the photoelectric effect.
A radioactive material is reduced to \( \frac{1}{8} \) of its original amount in 3 days. If \( 8 \times 10^{-3} \) kg of the material is left after 5 days, what was the initial amount of the material?
Which of the following Maxwell's equations is valid for time varying conditions but not valid for static conditions:
Which of the following fields has non-zero curl ?
Explain the working of n-p-n transistor in common base configuration.
The ratio of the magnitudes of electric field to the magnetic field of an electromagnetic wave is of the order of