List of top Physics Questions

As shown in figure, a planet revolves in elliptical orbit around the sun. Where is KE of the planet maximum?

A triode valve has an amplification factor of 20 and its plate is given a potential of 300 V. The grid-voltage to reduce the plate current to zero, is :

For a satellite moving in an orbit around the earth, the ratio of kinetic to potential energy is:

In an ideal parallel LC circuit, the capacitor is charged by connecting it to a DC source which is then disconnected. -The current in the circuit:

The period of SHM of a particle is 12 s. The phase difference between the positions at $ t=3\,s $ and $ t=4s $ will be:

A wire elongates by $ l \,mm$ when a load w is hanged from it. If the wire goes over a pulley and two weights w each are hung at the two ends, the elongation of the wire will be (in mm):

A body of mass $M$ moves with velocity $v$ and collides elastically with another body of mass $m$ $(M \gg>m)$ at rest, then the velocity of body of mass $m$ is :

If torque is zero then:

A solid sphere, a hollow sphere and a disc having same mass and radius roll down the same inclined plane from rest. Which one will reach the ground in least time?

If the momentum of body is increased by $100\%$, then the percentage increase in the kinetic energy will be:

If two soap bubbles of different radii are connected by a tube:

A body is moving along a rough horizontal surface with an initial velocity $6 \,m/s$. If the body comes to rest after travelling a distance $9 \,m$, then the coefficient of sliding friction will be:

A plano-convex lens of refractive index $1.5$ and radius of curvature $30 \,cm $ is silvered at the curved surface. Now, this lens has been used to form the image of an object. At what distance from this lens, an object be placed in order to have a real image of the size of the object?

At the height $80\, m$, an aeroplane is moved with $150\, m / s . A$ bomb is dropped from it, so as to hit a target. At what distance from the target should the bomb be dropped ? $\left(g=10\, m / s ^{2}\right)$

For an exothermic reaction, the value of:

For a Carnot engine, the source is at $500\, K$ and the sink at $300\, K$. What is efficiency of this engine?

According to Heisenberg's uncertainty principle, the product of uncertainties in position and velocities for an electron of mass $ 9.1\times {{10}^{-31}}\,kg $ is:

Escape velocity at surface of earth is $11.2\,km/s$. Escape velocity from a planet whose mass is the same as that of earth and radius $1/4$ that of earth, is :

A $100\, m$ long train is moving with a uniform velocity of $45\, km/h$. The time taken by the train to cross a bridge of length $1\, km$ is:

Velocity-time curve for a body, projected vertically upwards, is:

The frequency of vibration of string is given by $ v=\frac{P}{2l}{{\left[ \frac{F}{m} \right]}^{1/2}} $ Here $ p $ is number of segments in the string and $l$ is the length. The dimensional formula for $ m $ will be:

A ball of mass $150\,g$ moving with an acceleration $20 \,m/s^2$ is hit by a force, which acts on it for $0.1\, s$. The impulsive force is :

A cylinder of mass $10 \,kg$ is rolling on a rough plane with a velocity of $10 \,m/s$. If the coefficient of friction between the surface and cylinder is $0.5$, then before stopping it will cover a distance of (Take $g = 10\, m/s^2$):

What is the value of linear velocity, if angular velocity is $3 \hat i - 4 \hat j + \hat k$ and distance from the centre is $5 \hat i - 6 \hat j + 6 \hat k$ ?

Figure shows a body of mass m moving with a uniform speed $v$ along a circle of radius $r$. The change in velocity in going from $A$ to $B$ is: