List of top Physics Questions

In an experiment on a circuit, as shown in the figure, the voltmeter shows 8V reading. The resistance of the voltmeter is

A simple pendulum with length 100 cm and bob of mass 250 g is executing S.H.M. of amplitude 10cm. The maximum tension in the string is found to be $\frac{x}{40}$ N. The value of x is___.

As shown in the figure a block of mass $10\, kg$ lying on a horizontal surface is pulled by a force $F$acting at an angle $30^{\circ}$, with horizontal For $\mu_{ s }=0.25$, the block will just start to move for the value of $F$ : [Given g=10ms^-2]

The root mean square speed of molecules of nitrogen gas at 27°C is approximately : (Given mass of a nitrogen molecule = $4.6 × 10^{–26}$ kg and take Boltzmann constant KB = $1.4 × 10^{–23}$ JK–1 )

Six equal resistances are connected between points P, Q and R as shown in the figure. The net resistance will be maximum between:

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

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

The energy consumed by a 1000 W electric bulb when it is used for 1 hour 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

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 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 ratio of average electric energy density and total average energy density of an electromagnetic wave is:

Frenkel and Schottky defects are:

If work done on a body is positive, then what will be the sign of kinetic energy?

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):

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 $):

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:

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:

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?