Previous Year Questions
18 questions — organised by subject with solutions and explanations.
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The pressure that has to be applied to the ends of a steel wire of length 10 cm to keep its length constant when its temperature is raised by 100°C is:(For steel Young's modulus is and coefficient of
A particle moves with simple harmonic motion in a straight line. In first , after starting from rest it travels a distance , and in next it travels , in same direction, then:[Main 2014]
When a rubber-band is stretched by a distance x,it exerts a restoring force of magnitude where a and b constants.The work done in stretching the unstretched rubber band by L is :[Main 2014]
A student measured the length of a rod and wrote it as 3.50 cm.Which instrument did he use to measure it?[Main 2014]
There is a circular tube in a vertical plane.Two liquids which do not mix and of densities and are filled in the tube.each liquid subtends 90° angle at center. Radius joining their interfaces makes an
one mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure is adiabatic.The temperature at A,B and C are 400 K,800 K and 600 K respectively.choose the correct statement:[Main 201
On heating water,bubbles being formed at the bottom of the vessel detach and rise.Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel.If
A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric constant 2.2 between them.When the electric filed in the dielectric is V/m,the charge de
A block of mass m is places on a surface with a vertical cross section by .If the coefficient of friction is 0.5,the maximum height above the ground at which the block can be placed without slipping i
In a large buildings,there are 15 bulbs of 40 W,5 bulbs of 100 W,5 fans of 80 W and 1 heater of 1kW. The voltage of the electric mains is 220V. The minimum capacity of the main fuse of the building wi
Three rods of copper,Brass and Steel are welded together to from a Y -shaped structure.Area of cross-section of each rod ,Each of copper is maintained at 100°C where as ends of brass and steel are kep
Assume that an electric field exists in space. Then the potential difference , where is the potential at the origin and the potential at is :[Main 2014]
A mass 'm' is supported by a massless string wound around a uniform hollow cylinder of mass m and radius R.If the string does not slip on the cylinder,with what acceleration will the mass fall on rele
Four particles,each of mass M and equidistant from each other,move along a circle of radius R under the action of their mutual gravitational attraction.The speed of each particle is:[Main 2014]
From a tower of height H,a particle is thrown vertically upward with a speed u.The time taken by the particle,to hit the ground,is n times that taken by it to reach the highest point of its path.The r
A bob of mass m attached to an inextensible string of the length is suspended from a vertical support.The bob rotates in a horizontal circle with an angular speed rad/s about the vertical.About the po
An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level.The open end of the tube is then closed and sealed and the tube is raised vertically up by
A pipe of length 85 cm is closed from one end.Find the number of possible natural oscillation of air column in the pipe whose frequencies lie below 1250 Hz.The velocity of sound in air is 340 m/s[Main