List of top Physics Questions

When a mass is rotating in a plane about a fixed point, its angular momentum is directed along
If $v_e$ is escape velocity and $v _o$ is orbital velocity of a satellite for orbit close to the earth's suface, then these are related by
A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude $P_0$. The instantaneous velocity of this car is proportional to
The instantaneous angular position of a point on a rotating wheel is given by the equation $\theta(t)=2t^3-6t^2$ The torque on the wheel becomes zero at
The velocity of efflux of a liquid through an orific in the bottom of the tank does not depend upon
A cube has a side of length $1.2 \times 10^{-2} m$. Calculate its volume.
An electron is accelerated under a potential difference of 182 V. The maximum velocity of electron will be (Charge of electron is $1.6 \times 10^{-19}C $ and its mass is $9.1 \times 10^{-31}kg) $
The force constant of a spring gun is $50 \,N / m$. If a ball of $20 \,g$ be shoot by the gun, so that its spring is compressed by $10 \,cm$, the velocity of the ball is:
If density of earth increases $4$ times and its radius becomes half of what it is, our weight will
An ideal refrigerator has a freezer at a temperature of $-13^{\circ} C$. The coefficient of performance of the engine is $5$. The temperature of the air (to which heat is rejected) will be
A point source of light is placed $4 \,m$ below the surface of water of refractive index $\frac{5}{3}$. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut-off all right coming out of water is
The magnitude of electric field intensity $E$, such that an electron placed in it would experience an electrical force equal to its weight, is given by
A ball is dropped from height h and another from $2h.$ The ratio of time taken by the two balls to reach the ground is
The Poisson's ratio of a material is $0.5$. If a force is applied to a wire of this material, there is a decrease in the cross-sectional area by $4 \%$. The percentage increase in the length is:
Fast neutrons can easily be solved down by
The linear momentum $p$ of a body moving in one dimension varies with time $t$ according to the equation $p = a + bt^2$, where $a$ and $b$ are positive constant. The net force acting on the body is
A steady current flow in a metallic conductor of non-uniform cross-section. The quantity/quantities remaining constant along the whole length of the conductor is/are
The work done in placing a charge of $8 \times 10^{-18} \, C$ on a capacitor of capacity $100\, \mu F$ is
If a new planet is discovered rotating around sun with the orbital radius double that of the earth, then what will be its time period? (in earth's days) (Take $\sqrt{2}=1.4$ )
A toroidal solenoid with an air core has an average radius of $15 \,cm$, area if crosssection $12\, cm ^{2}$ and $1200$ turns. Ignoring the field variation across the cross- section of the toroid, the self-inductance of the toroid is:-
A passenger in an open car travelling at $30\, m / s$ throws a ball out over the bonnet. Relative to the car the initial velocity of the ball is $20 m / s$ at $60^{\circ}$ to the horizontal. The angle of projection of the ball with respect to the horizontal road will be :
Which of the following is not an example of perfectly inelastic collision
Natural length of a spring is $60 \,cm$ and its spring constant is $4000 \,N / m$. A mass of $20\, kg$ is hung from it. The extension produced in the spring is $\left(\right.$ take $\left.g=9.8 \,m / s ^{2}\right)$ :
The speed of earth's rotation about its axis is co. Its speed increases to $ x $ times to make effective acceleration due to gravity equal to zero at the equator, $ x $ is
A wooden cube (density of wood $'d'$) of side $'\ell'$ floats in a liquid of density $'\rho'$ with its upper and lower surfaces horizontal. If the cube is pushed slightly down and released, it performs simple harmonic motion of period $'T'$. Then, $'T'$ is equal to :