List of top Physics Questions

A freely falling body takes 't' second to travel first $(1/x)^{th}$ distance. Then, time of descent is
A film of water is formed between two straight parallel wires each 0.1 m long and at a separation of $5\times 10^{-3}m$. calculate the work required to increase $1 \times 10^{-3}m$ distance between wires ( surface Tension of water = 0.072N/m )
A film of water is formed between two straight parallel wires of length 10cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism how much work will have to be done ofwater (Surface tension of water $=(7.2 \times 10^{-2} \,N/m$ )
A fielder in a cricket match throws ball from the boundary line to the wicket keeper. The ball describes a parabolic path. Which of the following quantities remain constant during the motion in air? (Neglecting air resistance)
A fighter plane flying horizontally at an altitude of $1.5\,km$ with speed $720\,km\,h^{-1}$ passes directly overhead an anti-aircraft gun. At what angle from the vertical should the gun be fired for the shell with muzzle speed $600\,ms^{-1}$ to hit the plane. (Take $g = 10\,ms^{-2}$)
A faulty thermometer has $90.5^{\circ} \,C$ and $0.5^{\circ} \,C$ as upper and lower fixed points respectively. What is the correct temperature if this faulty thermometer reads $15.5^{\circ} C$
A ''double star'' is a composite system of two stars rotating about their center of mass under their mutual gravitational attraction. Let us consider such a ''double star'' which has two stars of masses 'm' and '2m' at a separation '1'. If T is the time period of rotation about their enter of mass then.
A drunkard walking in a narrow lane takes 8 steps forward and 6 steps backward, followed again by 8 steps forward and 6 steps backward and so on. Each step is 1 m long and requires 1 s. Determine how long the drunkard takes to fall in a pit 18 m away from the start
A double convex lens of focal length f is cut into 4 equivalent parts. One cut is perpendicular to the axis and the other is parallel to the axis of the lens. The focal length of each part is
A double convex lens made of glass of refractive index $1.56$ has both radii of curvature of magnitude $20 \,cm$. If an object is placed at a distance of $10 \,cm$ from this lens, the position of the image formed is
A diode as a rectifier converts
A cylindrical vessel contains a liquid of density $\rho$ upto a height h. The liquid is closed by a piston of mass m and area of cross section A. There is a small hole at the bottom of the vessel. The speed with which the liquid comes out of the vessel is
A cylindrical vessel of height $500\, mm$ has an orifice (small hole) at its bottom. The orifice is initially closed and water is filled in it upto height $H$. Now the top is completely sealed with a cap and the orifice at the bottom is opened. Some water comes out from the orifice and the water level in the vessel becomes steady with height of water column being $200\, mm$. The fall in height (in mm) of water level due to opening of the orifice is [Take atmospheric pressure $= 1.0 \times10^{5} N/m^{2}$, density of water $= 1000\, kg/m^{3}$ and $g = 10 m/s^{2}$. Neglect any effect of surface tension.]
A cylindrical lens is required to correct
A cyclotron can be used to produce high energy :
A cyclist moving on a circular track of radius $40\, m$ completes half a revolution in $40 \,s$. Its average velocity is
A cyclist is riding with a speed of $27\,km\, h^{-1}$. As he approaches a circular turn on the road of radius $80 \,m$, he applies brakes and reduces his speed at the constant rate of $0.50\,m s^{-1}$ every second. The net acceleration of the cyclist on the circular turn is
A current carrying coil is placed in an uniform magnetic field, with its plane parallel to the magnetic field. If the coil turns through angle $\theta$, the torque $\tau$ and $\theta$ are related as :
A current carrying loop of radius r carries a current I. It is placed in a magnetic field $B_0$ such that the plane of the coil is perpendicular to the magnetic field. The net force on the coil is
A cubical vessel of height 1 m is full of water. What is the amount of work done in pumping water out of the vessel? $(Take g = 10 ms^{-2})$
A current carrying circular loop of radius $R$ is placed in the $x - y$ plane with centre at the origin. Half of the loop with $x > 0$ is now bent so that it now lies in the $y - z$ plane
A cube of wood supporting 200g mass just floats in water. When the mass is removed, the cube rises by 1 cm, the linear dimension of cube is
A crowbar of length 120 cm has its fulcrum situated at a distance of 20cm from the load. The mechanical advantage of the crow bar is
A cricketer can throw a ball to a maximum horizontal distance of $100\,m$. With the same speed how much high above the ground can the cricketer throw the same ball?
A cricket ball of mass 0.25 kg with speed 10 ms$^{-1}$ collides with a bat and returns with same speed within 0.01 s. The force acted on bat is