List of top Physics Questions

Two ideal batteries of $emf V _{1}$ and $V _{2}$ and three resistances $R _{1}, R _{2}$ and $R _{3}$ are connected as shown in the figure. The current in resistance $R _{2}$ would be zero if

In a common emitter transistor amplifier an increase of $50 \,\mu A$ in the base current causes an increase of $1 \,mA$ in the collector current. The change in emitter current is

If $force (F)$, $velocity (V)$ and $time (T)$ are taken as fundamental units, then the dimensions of mass are

Considering normal incidence of ray, the equivalent refractive index of combination of two slabs shown in figure is:

A particle of charge q and mass m starts moving from the origin under the action of an electric field $\vec{E}=E_{0} \hat{i} $and $\vec{B}=B_{0} \hat{i}$ with a velocity $\vec{v}=v_{0} \hat{j}$ . The speed of the particle will become $\frac{\sqrt{5}}{2}v_{0}$ after a time

A particle moves along a curve of unknown shape but magnitude offeree $F$ is constant and always acts along tangent to the curve. Then,

A closely wound solenoid of $2000$ turns and area of cross-section $1.5 \times 10^{-4} m ^{2}$ carries a current of $2.0 A$. It is suspended through its center and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field $5 \times 10^{-2} T$, making an angle of $30^{\circ}$ with the axis of the solenoid. The torque on the solenoid will be

A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. If a force of 2.8 N is applied on the block parallel to the floor, the force of friction between the block and the floor is (g = 10 m s)

Figure shown a smooth inclined plane of inclination $\theta$ fixed in a car, $A$ sphere is set in pure rolling on the incline. For what value of a (the acceleration of car in horizontal direction) the sphere will continue pure rolling

A black body emits heat at the rate of $20\, W$. When its temperature is $727^{\circ} C$. Another black body emits heat at the rate of $15\, W$, when its temperature is $227^{\circ} C$. Compare the area of the surface of the two bodies, if the surrounding is at NTP.

Considering normal incidence of ray, the equivalent refractive index of combination of two slabs shown in figure is

What will be ratio of speed in first two seconds to the speed in next $4\,s$ ?

If there were a reduction in gravitational effect, which of the following forces do you think would change in some respect?

A body at a temperature of $728^{\circ} C$ and has surface area $5\, cm ^{2}$, radiates $300\, J$ of energy each minute. The emissivity is (Given Boltzmann constant $=5.67 \times 10^{-8} Wm ^{2} K ^{4}$ )

Two batteries of emf $4\, V$ and $8\, V$ with internal resistance $1\, \Omega$ and $2\, \Omega$ respectively are connected to an external resistance $R=\, \Omega$ as shown in figure. The current in circuit and the potential difference between $P$ and $Q$ respectively will be

The correct graph respectively the relation between energy $(E)$ of photoelectrons and frequency $v$ of incident light is

The maximum vertical distance through which a full dressed astronaut can jump on the earth is $0.5\, m$. Estimate the maximum vertical distance through which he can jump on the moon, which has a mean density $\frac{2}{3}$ rd that of the earth and radius one quarter that of the earth.

As shown in figure a simple harmonic motion oscillator having identical four springs has time period

The value of $g$ at a height equal to half the radius of the earth from the earth's surface is

A galaxy moves with respect to us so that sodium light of $589.0 \,nm$ is observed at $589.6 \,nm$. The speed of the galaxy is

A tank is filled with water. There is a hole in . the bottom. At the bottom total pressure is $3\, atm$, then, the velocity of water flowing from h $ \left( \text{1atm }=\text{1}{{0}^{5}}\text{ N}/{{\text{m}}^{\text{2}}} \right) $ ,then, the velocity of water flowing from hole is

A small metal sphere of radius $a$ is falling with a velocity $v$ through a vertical column of a viscous liquid. If the coefficient of viscosity of the liquid is $\eta$ then the sphere encounters an opposing force of

To determine the composition of a bimetallic alloy, a sample is first weighed in air and then in water. These weights are found to be $w_1$ and $w_2$ respectively. If the densities of the two constituent metals are $\rho_1$ and $\rho_2$ respectively, then the weight of the first metal in the sample is (where $\rho_w$ is the density of water)

A glass slab consists of thin uniform layers of progressively decreasing refractive indices $RI$ (see figure) such that the $RI$ of any layer is $\mu-m\Delta \mu$. Here $\mu$ and $\Delta \mu$ denote the $RI$ of $0^{th}$ layer and the difference in $RI$ between any two consecutive layers, respectively. The integer $m = 0, 1, 2, 3.....$ denotes the numbers of the successive layers. A ray of light from the 0th layer enters the $1^{st}$ layer at an angle of incidence of $30^\circ$. After undergoing the $m^{th}$ refraction, the ray emerges parallel to the interface. If $\mu = 1.5$ and $\Delta \mu = 0.015$, the value of $m$ is