List of top Physics Questions

If a seconds pendulum on the earth is taken to a planet whose gravity is half of the gravity on earth, its time period on that planet is

An engine delivers \(1000\) watt of power with \(80%\) efficiency. The input power is

At her maximum height a girl in a swing is \(3m\) above the ground and at the lowest point she is \(2m\) above the ground. Her maximum velocity is

A body of mass \(2\) kg changes its velocity from \((3\hat i-4\hat j)\,m/s\) to \((6\hat j+2\hat k)\,m/s\). What is the change in kinetic energy of the body?

The time taken by a body to slide down the smooth inclined plane is \(4\) sec. The time taken by a body to slide \(1/4^{th}\) of the length of the plane is

A block of mass \(m\) is lying on an inclined plane. The coefficient of friction between the plane and the block is \(\mu\). The force required to move the block up the inclined plane will be

A juggler throws ball into air. He throws one whenever the previous one is at its highest point. How high do the balls rise if he throws \(n\) balls each second?

A body starts from rest and travels with uniform acceleration. If the distance covered in first \(2\) seconds is \(x\) and next \(2\) seconds is \(y\), then

If a body released from the top of a tower of height \(H\) meter takes \(T\) seconds to reach the ground, where is the body at time \(T/2\) seconds from the ground?

If a pebble is thrown vertically upwards from the top of a tower with velocity \(5\,m/s\), it strikes the ground after \(3\) seconds. With what velocity the pebble strikes the ground? \((g=10\,m/s^2)\)

The area of rectangle with sides as \(\vec A=3\hat i+4\hat j\) and \(\vec B=\hat i+3\hat j\) is

If \(\vec A+\vec B=\vec C\) and \(A^2+B^2=C^2\), then the angle between vectors \(\vec A\) and \(\vec B\) is

Which pair of physical quantities have same dimensional formula?

If we choose velocity \(V\), length \(L\) and force \(F\) as fundamental physical quantities, then how would you express power in terms of \(V\), \(L\) and \(F\)?

In the (i) absence of electric field, and in the (ii) presence of electric field, the paths of electrons between successive collisions with the positive ions of the metal, are

Two point charges placed a distance d apart in vacuum exert a force of magnitude F on each other. One of the two charges is doubled. To keep the magnitude of force same the separation between the charges should be changed to

Two point charges, 4 µC and -3 µC (with no external field) are placed at (-6 cm, 0, 0) and (6 cm, 0, 0), respectively. The amount of work required to separate the two charges infinitely away from each other will be

In a series combination of capacitors connected across a battery

A charge of magnitude \(3 \times 10^{-7}\) C is located at a distance of 0.09 m from a point P. Obtain the work done in bringing a charge of \(2 \times 10^{-9}\) C from infinity to the point P.

If the protons and electrons are the only basic charges in the universe, all the observable charges have to be integral multiples of e. Thus, if an object contains x electrons and y protons, the net charge on the object will be

A small spherical shell \( S_1 \) has point charges \( q_1 = -3 \, \mu C \), \( q_2 = -2 \, \mu C \) and \( q_3 = 9 \, \mu C \) inside it. This shell is enclosed by another big spherical shell \( S_2 \). A point charge \( Q \) is placed in between the two surfaces \( S_1 \) and \( S_2 \). If the electric flux through the surface \( S_2 \) is four times the flux through surface \( S_1 \), find charge \( Q \).

For an ac source rated at 220 V, 50 Hz, which of the following statements is correct?

A resistor develops 800 J of thermal energy in 20 s on applying a potential difference of 20 V. Its resistance is

What is the focal length of a lens if its power is +2 D?