List of top Physics Questions

Two different coils have self - inductance \(L_1 = 9\text{ mH}\) and \(L_2 = 3\text{ mH}\). The current in first coil is increased at a constant rate. The current in the second coil is also increased at the same constant rate. At certain instant of time, the power given to the two coils is same. At that time, there was current and induced voltage in the two coils. At the same instant, the ratio of the energy stored in the first coil to that in second coil is

Water is flowing through a horizontal pipe in a streamline flow. At the narrowest part of the pipe

Four masses of \(1\text{ kg}, 2\text{ kg}, 3\text{ kg}\) and \(4\text{ kg}\) are kept at co-ordinates \((0, 0)\text{m, (0, 1)\text{m}\) and \((1, 0)\text{m}\) respectively. Using the co-ordinates of centre of mass its position vector is}

If the angular momentum of a particle of mass $m$ rotating along a circular path of radius $r$ with uniform speed is L, the centripetal force acting on the particle is

Two discs rotating about their respective axis of rotation with angular speeds $2 \text{ rads}^{-1}$ and $5 \text{ rads}^{-1}$ are brought into contact such that their axes of rotation coincide. Now, the angular speed of the system becomes $4 \text{ rads}^{-1}$. If the moment of inertia of the second disc is $1 \times 10^{-3} \text{ kg m}^2$, then the moment of inertia of the first disc (in $\text{kg m}^2$) is}

A wheel is rotating at 1800 rpm about its own axis. When the power is switched off, it comes to rest in 2 minutes. Then the angular retardation in $\text{rad s}^{-2}$ is}

Pick out the wrong statement from the following

A cyclist bends while taking turn in order to

In elastic collision

The total energy of a solid sphere of mass 300 g which rolls without slipping with a constant velocity of 5 ms\(^{-1}\) along a straight line is

A bullet when fired into a target loses half of its velocity after penetrating 20 cm. Further distance of penetration before it comes to rest is

Two blocks of masses 2 kg and 4 kg are attached by an inextensible light string as shown in the figure. If a force of 120 N pulls the blocks vertically upward, the tension in the string is (take \(g = 10 \text{ ms}^{-2}\))

The vertical component of velocity of a projectile at its maximum height ($u$ – velocity of projection, $\theta$ – angle of projection) is

A particle has the position vector $\vec{r} = \hat{i} - 2\hat{j} + \hat{k}$ and the linear momentum $\vec{p} = 2\hat{i} - \hat{j} + \hat{k}$. Its angular momentum about the origin is}

A particle starting with certain initial velocity and uniform acceleration covers a distance of 12 m in first 3 seconds and a distance of 30 m in next 3 seconds. The initial velocity of the particle is

The coordinates of a particle moving in $x-y$ plane at any instant of time $t$ are $x = 4t^2$; $y = 3t^2$. The speed of the particle at that instant is

A ball of mass 10 g moving perpendicular to the plane of the wall strikes it and rebounds in the same line with the same velocity. If the impulse experienced by the wall is 0.54 Ns, the velocity of the ball is

A ball is dropped from the top of a tower of height 100 m and at the same time another ball is projected vertically upwards from ground with a velocity 25 ms\(^{-1}\). Then the distance from the top of the tower, at which the two balls meet is

The ratio of distances traversed in successive intervals of time when a body falls freely under gravity from certain height is

The ionospheric layer acts as a reflector for the frequency range

In a simple pendulum experiment, the maximum percentage error in the measurement of length is 2% and that in the observation of the time-period is 3%. Then the maximum percentage error in determination of the acceleration due to gravity \( g \) is

The pitch and the number of circular scale divisions in a screw gauge with least count 0.02 mm are respectively

The collector resistance and the input resistance of a CE amplifier are respectively 10 k\(\Omega\) and 2 k\(\Omega\). If \(\beta\) of the transistor is 49, the voltage gain of the amplifier is

The light emitting diode (LED) is

The inputs A, B and C to be given in order to get an output Y = 1 from the following circuit are